Rocky Mountain cutthroat trout

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Rocky Mountain cutthroat trout
Rio Grande Cutthroat Trout Alamosa watershed.jpg
Rio Grande cutthroat trout, Oncorhynchus virginalis virginalis, the type subspecies
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Salmoniformes
Family: Salmonidae
Genus: Oncorhynchus
Species:
O. virginalis
Binomial name
Oncorhynchus virginalis
(Girard, 1857) [1]
Subspecies
Subspecies
  • Oncorhynchus virginalis virginalis(Rio Grande)
    O. v. bouvierii (Yellowstone)
    O. v. utah (Bonneville)
    O. v. ssp. (Bear River)
    O. v. macdonaldi† (Yellowfin)
    O. v. pleuriticus (Colorado River)
    O. v. ssp. (Green River)
    O. v. ssp. (San Juan)
    O. v. stomias (threatened)(Greenback)
Rocky Mountain Cutthroat.jpg
Range map of Rocky Mountain cutthroat trout (Onchorynchus virginalis)

The Rocky Mountain cutthroat trout(Oncorhynchus virginalis), formerly lumped in with the cutthroat trout (Oncorhynchus clarkii) [2] [3] [4] [5] [6] as one species with multiple subspecies, is a fish species of the family Salmonidae native to cold-water tributaries of the northern [7] and southern [8] Rocky Mountains, as well as into portions of the Great Basin [7] in North America. As a member of the genus Oncorhynchus , it is a part of the Pacific trout group, which includes the widely distributed rainbow trout. Cutthroat trout are popular gamefish, especially among anglers who enjoy fly fishing. The common name "cutthroat" refers to the distinctive red coloration on the underside of the lower jaw.

Contents

Taxonomy

Historically, cutthroat trout was considered one species (Oncorhynchus clarkii). [2] [9] However, recent genetic, taxonomic, and geologic [10] evidence has determined that cutthroat trout should be divided into four species, with each (except for the coastal cutthroat) having multiple subspecies corresponding to the evolutionary lineages [11] found within major river basins.

Subspecies and uniquely identifiable evolutionary units

During the annual meeting of the American Fisheries Society (AFS) in 2015, the Western Division of AFS (WDAFS) organized a special workshop with a panel of experts to evaluate the validity of the currently recognized subspecies, considering the available evidence both supporting and challenging the existing classification system. The panel found the current classification scientifically indefensible, and proposed a revised phylogeny and classification that aligns with the comprehensive evidence. [2]

In that discussion, the panelists were unable to resolve how to discuss specific subsets of the population. One side argued that subspecies are valuable taxonomic ranks, because they represent important evolutionary and ecological information that should be recognized to preserve biodiversity. The other side argued that subspecies do not always align with true evolutionary entities, and are arbitrary designations of geographic lineages within a species.

To resolve the impasse, the panel coined the term "uniquely identifiable evolutionary unit" (UIEU) to describe subunits that have diverged from species. These UIEUs are distinct population groups that show evolutionary independence but do not meet all the criteria to be considered full species. The creation of this term allowed the panel to acknowledge and discuss these units without getting caught up in the subspecies debate. [2]

Evolutionary lineages

The upper Snake River/Yellowstone evolutionary lineage

The upper Snake River/Yellowstone evolutionary lineage, exhibiting nine uniquely identifiable evolutionary units (UIEUs), shows complex patterns of divergence and dispersal. Genetic evidence suggests that the lineage initially diverged from the Lahontan Basin lineage around 9 million years ago, potentially facilitated by drainage connections between the two basins. [12] [13] [10] However, gene exchange between these lineages persisted until approximately 3.07 million years ago. [14] [15]

Among the nine recognized UIEUs within this lineage are an upper Snake/Yellowstone UIEU, a Bear River UIEU, and a Bonneville Basin UIEU. [7] Notably, the Fine-spotted Snake River Cutthroat Trout, previously designated as O. c. behnkei, lacks support as a distinct UIEU in the current molecular evidence, despite its ecological and morphological differences. [2]

Studies [16] [17] indicate a closer ancestral relationship between Bear River Cutthroat Trout and Yellowstone Cutthroat Trout than with Bonneville Cutthroat Trout, suggesting a complex branching within the upper Snake River/Yellowstone lineage. Additionally, mitochondrial DNA sequence data point to a genetic affinity between the Bonneville UIEU and Cutthroat Trout in the Colorado River and nearby watersheds, [18] indicating dispersal routes beyond those traditionally proposed.

Southern Rocky Mountain lineage

The Southern Rocky Mountain region, previously thought to harbor four cutthroat Trout subspecies, has been revealed to contain six distinct UIEUs. [19] [20] [21] [22] [8] This includes three distinct clades within the Colorado River cutthroat trout (O. v. pleuriticus), referred to as the blue and green lineages in the scientific literature, as well as the San Juan cutthroat trout, the Greenback cutthroat trout, the extinct Yellowfin cutthroat trout, and the Rio Grande cutthroat trout. [23] These findings, along with the misidentification of the original specimen used to describe the Greenback cutthroat trout, [8] [20] demonstrate the changing nature of the understanding of cutthroat trout diversity and the importance of continuing research.

Known strains of Rocky Mountain cutthroat trout

Common nameScientific name*RangeImage
Rio Grande Oncorhynchus virginalis virginalisThe southernmost subspecies of cutthroat trout, native to the Rio Grande, Canadian and Pecos River drainages of New Mexico and Colorado. [2] [8] Despite the fact that the Canadian drainage is tributary to the Arkansas River and not the Rio Grande, [6] genetic evidence shows they Canadian drainage from a headwater transfer from the Pecos drainage. [24] Rio Grande cutthroat were likely native to the Davis Mountains of Texas as well. [25]
Rio Grande Cutthroat Oncorhynchus clarkii virginalis.jpg
Rio Grande Cutthroat
Yellowstone O. v. bouvieriiNative to the Yellowstone and Upper Snake River drainages of Montana, Idaho, Wyoming and small areas of Utah and Nevada. The Snake River Finespotted cutthroat was once considered a distinct subspecies. However, recent genetic studies [7] reveal that it is actually a uniquely spotted form of the Yellowstone cutthroat. Previously, the Yellowstone cutthroat was classified as a "major" subspecies of cutthroat trout, [5] [6] but more recent classifications [2] now regard it as a subspecies of the Rocky Mountain cutthroat trout.
Yellowstone cutthroat.JPG
Bonneville O. v. utahThe Bonneville cutthroat evolved in ancient Lake Bonneville, which reached its peak during the last ice age, and overflowed into the Snake River. [26] [27] Today, most existing populations are found in small, isolated streams along the basin’s edge. Additionally, there are remnant populations within the current native range of the Yellowstone cutthroat, located in a few small streams in the Raft and Portneuf River drainages in Idaho, from when ancient Lake Bonneville overflowed into the Snake River drainage during the last ice age [7] [28] [29]
Bonneville cutthroat.jpg
Bear RiverO. v. ssp.Native to the Bear River watershed at the Idaho, Utah, and Wyoming border. The Bear River cutthroat were lumped with the Bonneville cutthroat as a single subspecies until recently. [5] [6] Genetic studies show they are actually more closely related to the Yellowstone cutthroat than to the Bonneville cutthroat. [7] [30] [31] Geological evidence suggests that the Bear River flowed into the Snake River until about 500,000 years ago, when volcanic activity redirected the river south into its own basin and formed ancient Lake Thatcher. [32] The connection to the Bonneville Basin likely occurred around 20,000 years ago when Lake Thatcher overflowed into ancient Lake Bonneville. [33] Genetic evidence indicates a distinctiveness from Bonneville cutthroat, and is recognized as a distinct subspecies [2]
Bear River Cutthroat Trout Bear river ct ID 09222019 (1).jpg
Bear River Cutthroat Trout
Yellowfin O. v. macdonaldi†Native to the Twin Lakes of the Arkansas River drainage in Colorado. The Yellowfin cutthroat shared its habitat with the greenback cutthroat trout, but was distinguished by its morphology and life history. [3] [4] [5] After the introduction of rainbow trout into Twin Lakes, the Yellowfin cutthroat trout went extinct. [20] [9] [8] Recent research has speculated that the Yellowfin cutthroat may have been native to the entire Arkansas River basin, not just Twin Lakes. [20] Efforts are underway with hopes of locating a lost population. [17] [18] A rare strain of cutthroat from Hayden Creek, tributary to the Arkansas River, was rescued from a fire in 2016, and used to reestablish populations around the basin. [19] [21] These are the only known fish to share genetics with Yellowfin cutthroat. [14]
Yellowfin Cutthroat FMIB 51774 Yellow-fin Trout of Twin Lakes, Salmo macdonaldi Jordan & Evermann Twin Lakes, Colo.jpeg
Yellowfin Cutthroat
Colorado River O. v. pleuriticusSometimes referred to as the "green lineage" in scientific literature. Native to the Dolores, Colorado, and Gunnison River Basins. [19] [21] [34] [8] Some small populations existed in Utah. [23]
Colorado River cutthroat trout Colorado River cutthroat trout.jpg
Colorado River cutthroat trout
Green RiverO. v. ssp.Historically lumped into the Colorado River cutthroat, and native to the White, Yampa, and upper Green River watersheds, extending from northwest Colorado, southwest Wyoming, and into eastern and central Utah. [19] [8] Sometimes referred to as the "blue lineage" in scientific literature. Stocking programs using wild eggs collected from Trappers Lake in the early 1900s has resulted in pure, healthy populations - sometimes well outside its native range. [8] [23]
Green River cutthroat trout Colo river cutthroat BLM.jpg
Green River cutthroat trout
San JuanO. v. ssp.Also lumped in with the Colorado River cutthroat. Native to San Juan River and its tributaries across small portions of the Four Corners region. This trout was formally re-discovered in 2012, by analyzing the genetics of two museum specimens obtained from the basin in 1874. [19] [8] Between 2012 and mid-2018, it was presumed extinct, until a handful of populations were discovered near the San Juan National Forest. [35] The 416 Fire prompted a hasty rescue of pure specimens from two remote creeks, and have been used to establish a brood stock and restore populations around the basin. [36] [37] [23]
San Juan cutthroat trout San Juan Cutthroat Trout.jpg
San Juan cutthroat trout
Greenback O. v. stomias (threatened)Native to the South Platte River basin, though also considered native to the Arkansas basin at one time. [24] [19] [8] It was considered extinct by the 1930s, until a population was discovered in Rocky Mountain National Park in 1957. This led to extensive progress towards reestablishing populations across Colorado. However, in 2012, genetic testing revealed that the trout used in the many-decade reintroduction program were Colorado River or Rio Grande cutthroats, and that the only remaining population of pure greenbacks were in a 4-mile (6.4 km) stretch of Bear Creek, a tributary of the Arkansas River. [24] [19] [8] Several populations have since been established using this pure broodstock. Colorado Parks and Wildlife announced in 2022 that the wild spawning of greenbacks had been observed. [38]
Greenback cutthroat trout Greenbackcutthroat.jpg
Greenback cutthroat trout
*as proposed by Love Stowell, et al. 2018. [9]

Description

Like all other cutthroat, Rocky Mountain cutthroat trout display a high degree of variability in terms of size, color, and habitat selection. These trout exhibit a range of colors from yellowish-brown, silvery, brassy, to brilliant orange-red and golden. They may have bright golden-orange, red, or rose tints. Spots vary from medium-large and rounded to small and pepper-like, and can be concentrated on the caudal peduncle or evenly distributed over the sides. They typically have between 60-63 vertebrae and a number of lateral scales ranging from 150-200. Adult weight ranges can vary between approximately 10 grams to over 7 kilograms. The largest known Rocky Mountain cutthroat was the Yellowfin. [2] [3] [4] [5] [6] [8] [14] [39] Due to historical introductions and hybridization with other subspecies, it can be difficult to unambiguously separate some Rocky Mountain cutthroat trout from other closely related subspecies based on appearance alone. All have distinctive red, pink, or orange linear marks along the underside of their mandibles in the lower folds of the gill plates. The common name "cutthroat" comes from these marks, coined in an 1884 article in The American Angler by outdoor writer Charles Hallock. [40]

Lifecycle

Most Rocky Mountain cutthroat trout live a fluvial or adfluvial lifecycle. However, the broad diversity of environments, influenced by factors such as elevation and stream characteristics, leads to a wide array of life history patterns and survival strategies. [5] [7] [8] Likewise, the specific timing and duration of these stages can vary among different populations and subspecies. For example, populations at higher elevations may have shorter growing seasons and delayed maturity compared to those in lower-elevation streams. Additionally, factors such as stream flow, temperature, and food availability can significantly influence growth rates and survival throughout the lifecycle. [5]

Populations that are born and raised in small streams tend to be less migratory and move short distances. Conversely, some migratory populations move great distances (up to 100 km) to reach ideal spawning, feeding, and overwintering habitats. [41] [42] [43] Lacustrine populations tend to be the largest, with variations depending on whether they migrate upstream or downstream to spawn in inlet versus outlet tributaries. [44] [45] Most populations spawn in smaller tributaries, though main-stem spawning in larger rivers will sometimes occur.

Spawning

Spawning generally occurs in spring, with peak activity in May or June, but can extend into July at higher altitudes. Spawning locations are often in the upper reaches of streams, where females create redds in gravel to deposit eggs. [5] [7] [8]

Egg incubation and emergence

Eggs typically incubate for about 4-6 weeks before hatching. After hatching, the alevins remain in the gravel for several more weeks, relying on their yolk sacs for nourishment. [5]

Fry and juvenile stages

Once the yolk sac is absorbed, the fry emerge from the gravel and begin feeding on small aquatic insects and zooplankton. Growth rates vary widely depending on environmental conditions (such as elevation), with some individuals reaching 300mm in length within two years. [5]

Maturity and adult stages

Sexual maturity is usually reached between ages 2 and 4, but can be delayed in harsher, high-elevation environments where growing seasons are shorter. Adults grow at a slower rate than juveniles. They primarily feed on aquatic and terrestrial insects, as well as other small fish. [5]

Lifespan

The maximum lifespan of cutthroat trout is estimated to be around 7-10 years, but most individuals likely live shorter lives due to factors like predation, fishing pressure, and habitat degradation. [5]

Ecology

Range

Rocky Mountain cutthroat trout are historically native to a broad range of river drainages and basins across the western United States. They inhabit areas from the Rio Grande, Canadian, and Pecos River drainages in New Mexico and southern Colorado, extending to the Yellowstone and Upper Snake River drainages in Montana, Idaho, Wyoming, and parts of Utah and Nevada. They are also found in the Bear River watershed at the Idaho, Utah, and Wyoming border, and in various basins such as the Dolores, Colorado, Gunnison, White, Yampa, and upper Green River watersheds in Colorado, Wyoming, and Utah. They are also native to the South Platte and Arkansas drainages. At one time, they also likely were established in the Davis Mountains in Texas. [25] Currently, their range is broadly restricted to the headwater reaches of these watersheds. [7] [8]

Habitat

As with other salmonids, Rocky Mountain cutthroat trout need cold, clean, and well-oxygenated water to survive and thrive. They typically inhabit creeks, streams, and small rivers with gravelly bottoms or cold, moderately deep lakes. [5] Stream-side vegetation provides shade and minimizes erosion and sediment load (mainly silt) by stabilizing banks, which would otherwise adversely affect habitat and spawning grounds. Beaver ponds provide refuge during periods of drought and habitat to over winter in. [46] As seen with other cutthroat trout, they exhibit an opportunistic feeding behavior with diverse diets, and as their size increases, so does their food. Some of their primary forage, frequently imitated by fly fishers, include macroinvertebrates such as caddisflies, stoneflies, mayflies and aquatic dipterans (including midges and craneflies) in adult, larval, and pupal stages. Other prey include adult terrestrial insects such as ants, beetles, spiders, grasshoppers and crickets, and aquatic items including crayfish, freshwater molluscs, fish eggs, shrimp and other crustaceans, and other fish. [5] [47] Generally, they adjust their diet and feeding behavior due to factors such as food availability, habitat, age, and size. For example, lake-dwelling Yellowstone rocky mountain cutthroat eat zooplankton and bottom-dwelling insects, [48] while Bear River species in Bear Lake have evolved with a diet largely dependent on smaller fish, such as the endemic Bonneville cisco. [49] Stream-resident cutthroat are primarily drift feeders, eating insects carried by the current. [47]

Population threats

Degradation and loss of habitat

Cutthroat trout populations are negatively impacted by habitat loss and degradation caused by human activities. [5] [14] [50] These activities can include damming, logging, mining, grazing, wildfires, agriculture and water diversions all negatively impact Rocky Mountain cutthroat trout. Dams alter the natural flow of rivers and streams, fragmenting habitats and changing water temperatures, which can disrupt the trout's breeding and migration patterns. Logging and grazing removes streamside vegetation, leading to increased water temperatures and sedimentation, which negatively affect trout eggs and juvenile survival. Mining activities often release pollutants into waterways, degrading water quality and harming trout populations, while urban development can lead to increased stormwater runoff, which carries pollutants and sediment into streams, further degrading habitat quality. All of these activities can lead to changes in water temperature, flow patterns, and the availability of food and habitat, which are all crucial for the survival and reproduction of cutthroat trout. [50] [51] [52]

Habitat connectivity has always provided a safety net from extinction by linking habitat of various quality to stream headwaters. In fact, the source-sink processes allowed various cutthroat strains to evolve, survive, and thrive through the eons. [53] [54] Conversely, the loss of drainage connections by human activities has been a significant threat to cutthroat throughout the west. [11] [50] [55]

Hybridization and introgression

Cutthroat trout easily hybridize with introduced rainbow trout, which can lead to the loss of genetically pure cutthroat trout populations. Hatchery practices have also contributed to this problem by accidentally mixing different subspecies. [19] [9] [56] [30] Even by the early 1900s, many fisheries were wholly or partially disrupted by the introduction of non-native rainbow trout or by the transplanting of distinct populations of cutthroats outside of their native range. [14] [21]

Not only does hybridization result in less-adaptive and successful cutthroat, [56] [57] it makes the genetic unravelling of the native trout to each basin incredibly complicated. [14] [21] [19] [9] [56] [30]

Competition and predation

Introduced species such as brown trout, rainbow trout, brook trout, and lake trout can compete with cutthroat trout for food and resources, and can also prey on them. One extreme example can be seen in Yellowstone Lake in Yellowstone National Park, where introduced lake trout have caused a serious decline in Yellowstone cutthroat trout. [58]

Another study looked at hatchery-raised Rio Grande cutthroat trout which inhabit the same stream as wild brown trout. That study showed a lower body fat content and substantially different diet than Rio Grande cutthroat found in streams without brown trout. They also showed fin damage in the presence of brown trout, all of which suggests aggressive and territorial behavior by brown trout. [59]

Non-native brook trout and rainbow trout have been stocked and transplanted throughout the native range of Rocky Mountain cutthroat trout, are widely established, and generally self-sustaining. In Idaho, these are often cited as the largest long-term threats to both Yellowstone and Bonneville cutthroat trout by displacing them. [60] [61] [62] Brook trout and Rocky Mountain cutthroat trout exploit very similar niches and directly compete with each other. However, because brook trout have many reproductive advantages (earlier maturation, greater fertility, and offspring emerge earlier in the year), brook trout are able to replace cutthroat very quickly. [7] [63] [64] [65]

Displacement by introduced fish species is primarily attributed to disease or parasite transmission, competition, and hybridization. The impact of each mechanism varies significantly depending on the intruding species involved. With rainbow trout, the main concern is introgressive hybridization, though competition does play a role. [57]

Disease

See also: Salmonid susceptibility to whirling disease

Rocky Mountain cutthroat trout are susceptible to a variety of diseases and parasites, which can be exacerbated by stress caused by other factors such as climate change, change in water flow regimes, habitat loss and hybridization. [66] [67] [52] Whirling disease is especially damaging to native trout populations.

Climate change

Over deep time, climate change played the predominant role in the diversification and speciation/subspeciation of cutthroat trout, including the Rocky Mountain species and daughter taxa. [9] [50] [68] [69] [70] However, rising water temperatures and changes in streamflow patterns caused by climate change can make it difficult for cutthroat trout to survive and reproduce. [14] [71] [72] [73] This is exacerbated by habitat fragmentation; without the connectivity of populations to buffer the effects of shrinking habitat, it imperils most cutthroat populations. [50] [74] [75] [52] [67]

Related Research Articles

<span class="mw-page-title-main">Trout</span> Freshwater fish from subfamily Salmoninae

Trout is a generic common name for numerous species of carnivorous freshwater ray-finned fishes belonging to the genera Oncorhynchus, Salmo and Salvelinus, all of which are members of the subfamily Salmoninae in the family Salmonidae. The word trout is also used for some similar-shaped but non-salmonid fish, such as the spotted seatrout/speckled trout.

<span class="mw-page-title-main">Rainbow trout</span> Fresh-water species of fish

The rainbow trout is a species of trout native to cold-water tributaries of the Pacific Ocean in North America and Asia. The steelhead is an anadromous (sea-run) form of the coastal rainbow trout(O. m. irideus) or Columbia River redband trout (O. m. gairdneri) that usually returns to freshwater to spawn after living two to three years in the ocean. Freshwater forms that have been introduced into the Great Lakes and migrate into tributaries to spawn are also called steelhead.

<span class="mw-page-title-main">Cutthroat trout</span> Species of fish

The cutthroat trout is a group of four fish species of the family Salmonidae native to cold-water tributaries of the Pacific Ocean, Rocky Mountains, and Great Basin in North America. As a member of the genus Oncorhynchus, it is in the Pacific trout group, which includes the widely distributed rainbow trout. Cutthroat trout are popular gamefish, especially among anglers who enjoy fly fishing. The common name "cutthroat" refers to the distinctive red coloration on the underside of the lower jaw. The specific name clarkii was given to honor explorer William Clark, coleader of the Lewis and Clark Expedition.

<span class="mw-page-title-main">Bonneville cutthroat trout</span> Subspecies of fish

The Bonneville cutthroat trout is a subspecies of cutthroat trout native to tributaries of the Great Salt Lake and Sevier Lake. Most of the fish's current and historic range is in Utah, but they are also found in Idaho, Wyoming, and Nevada. This is one of 14 or so recognized subspecies of cutthroat trout native to the western United States.

<i>Oncorhynchus</i> Genus of fishes

Oncorhynchus is a genus of ray-finned fish in the subfamily Salmoninae of the family Salmonidae, native to coldwater tributaries of the North Pacific basin. The genus contains twelve extant species, namely six species of Pacific salmon and six species of Pacific trout, all of which are migratory mid-level predatory fish that display natal homing and semelparity.

<span class="mw-page-title-main">Lahontan cutthroat trout</span> Subspecies of fish

Lahontan cutthroat trout is the largest subspecies of cutthroat trout and the state fish of Nevada. It is one of three subspecies of cutthroat trout that are listed as federally threatened.

<span class="mw-page-title-main">Yellowstone cutthroat trout</span> Subspecies of fish

The Yellowstone cutthroat trout is a subspecies of the cutthroat trout. It is a freshwater fish in the salmon family. Native only to a few U.S. states, their original range was upstream of Shoshone Falls on the Snake River and tributaries in Wyoming, also across the Continental Divide in Yellowstone Lake and in the Yellowstone River as well as its tributaries downstream to the Tongue River in Montana. The species is also found in Idaho, Utah and Nevada.

<span class="mw-page-title-main">Redband trout</span> Subspecies group of fish

Redband trout are a group of three recognized subspecies of rainbow trout. They occur in three distinct regions in Pacific basin tributaries and endorheic basins in the western United States. The three subspecies are the Columbia River redband trout, the McCloud River redband trout and the Great Basin redband trout.

<span class="mw-page-title-main">Utah chub</span> Species of fish

The Utah chub is a cyprinid fish native to western United States, where it is abundant in the upper Snake River basin and the Bonneville basin.

<span class="mw-page-title-main">Greenback cutthroat trout</span> Subspecies of fish

The greenback cutthroat trout is the easternmost subspecies of cutthroat trout. The greenback cutthroat, once widespread in the Arkansas and South Platte River drainages of Eastern Colorado and Southeast Wyoming, today occupies less than 1% of its historical range. It is currently listed as threatened under the Endangered Species Act. It was adopted as the state fish of Colorado on March 15, 1994, replacing the unofficial rainbow trout.

<span class="mw-page-title-main">Snake River fine-spotted cutthroat trout</span> Subspecies of fish

The Snake River fine-spotted cutthroat trout is a form of the cutthroat trout that is considered either as a separate subspecies O. c. behnkei, or as a variety of the Yellowstone cutthroat trout. The fish takes its common name from its original habitat, the Snake River of southern Idaho and western Wyoming, and from its unusual pattern of hundreds of small spots that cover most of its body, differing from the larger-spotted Yellowstone cutthroat pattern. Genetically, it cannot be distinguished from the Yellowstone cutthroat trout, and before the construction of dams, no physical barriers were between the ranges of the two subspecies in the Snake River drainage.

<span class="mw-page-title-main">Westslope cutthroat trout</span> Subspecies of fish

The westslope cutthroat trout, also known as the black-spotted trout, common cutthroat trout and red-throated trout is a subspecies of the cutthroat trout and is a freshwater fish in the salmon family of order Salmoniformes. The cutthroat is the Montana state fish. This subspecies is a species of concern in its Montana and British Columbia ranges and is considered threatened in its native range in Alberta.

<span class="mw-page-title-main">Coastal cutthroat trout</span> Subspecies of fish

The coastal cutthroat trout, also known as the sea-run cutthroat trout, blue-back trout or harvest trout, is one of the four species of cutthroat trout found in Western North America. The coastal cutthroat trout occurs in four distinct forms. A semi-anadromous or sea-run form is the most well known. Freshwater forms occur in both large and small rivers and streams and lake environments. The native range of the coastal cutthroat trout extends south from the southern coastline of the Kenai Peninsula in Alaska to the Eel River in Northern California. Coastal cutthroat trout are resident in tributary streams and rivers of the Pacific basin and are rarely found more than 100 miles (160 km) from the ocean.

<span class="mw-page-title-main">Lake Crescent cutthroat trout</span> North American freshwater fish

The Crescenti cutthroat trout or the Lake Crescent cutthroat trout is a North American freshwater fish, a local form of the coastal cutthroat trout isolated in Lake Crescent in Washington. While previously attributed to a distinct subspecies Oncorhynchus clarkii crescenti, it is not currently recognized at the subspecies rank. However the cutthroat trout of Lake Crescent do remain distinct. They have the highest known gill raker and vertebrae counts of any coastal cutthroat population. The cutthroat are believed to have been isolated in Lake Crescent after a landslide blocked the eastern outflow of the lake.

<span class="mw-page-title-main">Rio Grande cutthroat trout</span> Subspecies of fish

The Rio Grande cutthroat trout, a member of the family Salmonidae, is found in northern New Mexico and southern Colorado in tributaries of the Rio Grande.

<span class="mw-page-title-main">Cutbow</span> Hybrid fish

The cutbow is an interspecific fertile hybrid between rainbow trout and cutthroat trout. While natural separation of spawning habitat limited hybridization in most native populations of rainbow and cutthroat trout, introduction of non-native hatchery-raised rainbow trout into native cutthroat trout range increased hybridization across the landscape. Due to these introductions, many populations of cutthroat trout are at risk of genetic pollution. As a result, significant management intervention at state and federal levels has occurred to preserve native populations of cutthroat trout.

<span class="mw-page-title-main">Ecology of the Rocky Mountains</span> Ecology of the Rocky Mountain range in North America

The ecology of the Rocky Mountains is diverse due to the effects of a variety of environmental factors. The Rocky Mountains are the major mountain range in western North America, running from the far north of British Columbia in Canada to New Mexico in the southwestern United States, climbing from the Great Plains at or below 1,800 feet (550 m) to peaks of over 14,000 feet (4,300 m). Temperature and rainfall varies greatly also and thus the Rockies are home to a mixture of habitats including the alpine, subalpine and boreal habitats of the Northern Rocky Mountains in British Columbia and Alberta, the coniferous forests of Montana and Idaho, the wetlands and prairie where the Rockies meet the plains, a different mix of conifers on the Yellowstone Plateau in Wyoming, the montane forests of Utah, and in the high Rockies of Colorado and New Mexico, and finally the alpine tundra of the highest elevations.

The Humboldt cutthroat trout is a subspecies of cutthroat trout, a North American fish in the family Salmonidae. It is one of the several subspecies of cutthroat trout. It was formally scientifically named in 2008 by Trotter and Behnke, who stated its distribution is in the basins of the upper Humboldt River of northern Nevada, the Upper Quinn River, as well as the Whitehorse (Coyote) basin (Oregon). The Nevada and Oregon Fish and Wildlife authorities still consider these populations belonging to the subspecies O. c. henshawi.

<span class="mw-page-title-main">Robert J. Behnke</span> American fisheries biologist

Dr. Robert J. Behnke was an American fisheries biologist and conservationist who was recognized as a world authority on the classification of salmonid fishes. He was popularly known as "Dr. Trout" or "The Trout Doctor". His seminal work, Trout and Salmon of North America, was published in 2002. He wrote a regular column for Trout Magazine, the quarterly publication of Trout Unlimited. He was a fisheries biologist with the U.S. Fish and Wildlife Service in the Colorado Cooperative Fish and Wildlife Research Unit and a professor at Colorado State University in the 1970s. He became a Professor Emeritus at the Department of Fishery and Wildlife Biology at Colorado State University.

References

  1. ↑ Girard, Charles (1857). Notice upon the species of the genus Salmo, of authors, observed chiefly in Oregon and California. Philadelphia: Proceedings of the Academy of Natural Sciences of Philadelphia. pp. 217–220.
  2. 1 2 3 4 5 6 7 8 9 Trotter, Patrick; Bisson, Peter; Roper, Brett; Schultz, Luke; Ferraris, Carl; Smith, Gerald R.; Stearley, Ralph F. (2018), Trotter, Patrick; Bisson, Peter; Shultz, Luke; Roper, Brett (eds.), "A Special Workshop on the Taxonomy and Evolutionary Biology of Cutthroat Trout", Cutthroat Trout: Evolutionary Biology and Taxonomy, American Fisheries Society, doi:10.47886/9781934874509.ch1, ISBN   978-1-934874-50-9 , retrieved 2024-08-12
  3. 1 2 3 Behnke, R. J. 1979. Monograph of the native trouts of the genus Salmo of western North America. U.S. Forest Service, Lakewood, Colorado.
  4. 1 2 3 Behnke, R. J. 1988. Phylogeny and classification of Cutthroat Trout. Pages 1–7 in R. E. Gresswell, editor. Status and management of interior stocks of Cutthroat Trout. American Fisheries Society, Symposium 4, Bethesda, Maryland.
  5. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Behnke, R.J. 1992. Native trout of western North America. American Fisheries Society, Monograph 6, Bethesda, Maryland.
  6. 1 2 3 4 5 Behnke, R. J. 2002. Trout and salmon of North America. The Free Press, New York.
  7. 1 2 3 4 5 6 7 8 9 10 Campbell, Matthew R.; Keeley; Kozfkay; Loxterman; Evans (2018), Trotter; Bisson; Schultz, Shiozawa; Roper (eds.), "Describing and Preserving the Diversity of Cutthroat Trout in the Yellowstone River, Snake River, and Bonneville Basin", Cutthroat Trout: Evolutionary Biology and Taxonomy, American Fisheries Society, doi:10.47886/9781934874509.ch12, ISBN   978-1-934874-50-9 , retrieved 2024-08-12
  8. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Rogers; Bestgen; Love Stowell; Martin (2018), Trotter; Bisson; Schultz; Roper (eds.), "Cutthroat Trout Diversity in the Southern Rocky Mountains", Cutthroat Trout: Evolutionary Biology and Taxonomy, American Fisheries Society, doi:10.47886/9781934874509.ch13, ISBN   978-1-934874-50-9 , retrieved 2024-08-12
  9. 1 2 3 4 5 6 Love Stowell; Metcalf; Markle; Stearly (2018), Trotter; Bisson; Shultz; Roper (eds.), "Species Conceptualization and Delimitation: A Framework for the Taxonomic Revision of Cutthroat Trout", Cutthroat Trout: Evolutionary Biology and Taxonomy, American Fisheries Society, doi:10.47886/9781934874509.ch2, ISBN   978-1-934874-50-9 , retrieved 2024-08-13
  10. 1 2 Link; Keeley (2018), Trotter; Bisson; Shultz; Roper (eds.), "Geologic Constraints on Snake-Columbia River Drainage Changes and the Associated Evolutionary Diversification of Cutthroat Trout over the Past 17 Million Years", Cutthroat Trout: Evolutionary Biology and Taxonomy, American Fisheries Society, doi:10.47886/9781934874509.ch3, ISBN   978-1-934874-50-9 , retrieved 2024-08-13
  11. 1 2 Smith; Stearly (2018), Trotter; Bisson; Shultz; Roper (eds.), "The Fossil Record of Cutthroat Trout: Implications for Evolution and Conservation", Cutthroat Trout: Evolutionary Biology and Taxonomy, American Fisheries Society, doi:10.47886/9781934874509.ch4, ISBN   978-1-934874-50-9 , retrieved 2024-08-13
  12. ↑ Wallace, A. R. 2003. Regional geologic setting of late Cenozoic lacustrine diatomite deposits, Great Basin and surrounding region: overview and plans for investigation. U.S. Geological Survey, Bulletin 2209-B, Reston, Virginia.
  13. ↑ Wallace, A. R., M. E. Perkins, and R. J. Fleck. 2008. Late Cenozoic paleogeographic evolution of northeastern Nevada: evidence from sedimentary basins. Geosphere 4:36–74
  14. 1 2 3 4 5 6 7 Shiozawa, D. K., R. P. Evans, D. D. Houston, and P. J. Unmack. 2018. Geographic variation, isolation, and evolution of Cutthroat Trout with comments on future directions for management and research. Pages 129–172 in P. Trotter, P. Bisson, L. Schultz, and B. Roper, editors. Cutthroat Trout: evolutionary biology and taxonomy. American Fisheries Society, Special Publication 36, Bethesda, Maryland.
  15. ↑ Arnold, M. L. 2007. Evolution through genetic exchange. Oxford University Press, New York
  16. ↑ Toline, C., T. Seamons, and J. Hudson. 1999. Mitochondrial DNA analysis of selected populations of Bonneville, Colorado River, and Yellowstone Cutthroat Trout. Final report of Utah State University, Department of Fisheries and Wildlife to Utah Division of Wildlife Resources, Salt Lake City.
  17. 1 2 Smith, G. R., T. E. Dowling, K. W. Gobalet, T. Lugaski, D. K. Shiozawa, and R. P. Evans. 2002. Biogeography and timing of evolutionary events among Great Basin fishes. Pages 175–234 in R. Hershler, D. B. Madsen, and D. R. Curry, editors. Great Basin aquatic systems history. Smithsonian Institution Press, Smithsonian Contributions to the Earth Sciences 33, Washington, D.C.
  18. 1 2 Loxterman, J. L., and E. R. Keeley. 2012. Watershed boundaries and geographic isolation: patterns of diversification in Cutthroat Trout from western North America. BMC Evolutionary Biology [online serial] 12:38.
  19. 1 2 3 4 5 6 7 8 9 Metcalf, J. L., V. L. Pritchard, S. M. Silvestri, J. B. Jenkins, J. S. Wood, D. E. Cowley, R. P. Evans, D. K. Shiozawa, and A. P. Martin. 2012. Historical stocking data and 19th century DNA reveal human-induced changes to native diversity and distribution of Cutthroat Trout. Molecular Ecology 21:5194–5207
  20. 1 2 3 4 Rogers, K. B. 2012. Piecing together the past: using DNA to resolve the heritage of our state fish. Colorado Outdoors 2012 September/October:28–32
  21. 1 2 3 4 5 Bestgen, K. R., K. B. Rogers, and R. Granger. 2013. Phenotype predicts genotype for lineages of native Cutthroat Trout in the Southern Rocky Mountains. Colorado State University, Larval Fish Laboratory, Fort Collins. Final report to U.S. Fish and Wildlife Service, Colorado Field Office, Denver
  22. ↑ Rogers, K. B., K. R. Bestgen, and J. Epp. 2014. Using genetic diversity to inform conservation efforts for native Cutthroat Trout of the Southern Rocky Mountains. Pages 218–228 in R. F. Carline and C. LoSapio, editors. 2014. Wild Trout XI: looking back and moving forward. Wild Trout Symposium, West Yellowstone, Montana. Available: www.wildtroutsymposium. com/wildTroutXI.php. (January 2018).
  23. 1 2 3 4 Bestgen, Kevin R.; Rogers, Kevin B.; Granger, Robert (March 2019). "Distinct Phenotypes of Native Cutthroat Trout Emerge under a Molecular Model of Lineage Distributions". Transactions of the American Fisheries Society. 148 (2): 442–463. Bibcode:2019TrAFS.148..442B. doi: 10.1002/tafs.10145 . ISSN   0002-8487.
  24. 1 2 3 Pritchard, V. L.; Metcalf, J. L.; Jones, K.; Martin, A. P.; Cowley, D. E. (2008-08-15). "Population structure and genetic management of Rio Grande cutthroat trout (Oncorhynchus clarkii virginalis)". Conservation Genetics. 10 (5): 1209. doi:10.1007/s10592-008-9652-8. ISSN   1572-9737.
  25. 1 2 Garrett, G.P. and G.C. Matlock. 1991. Rio Grande Cutthroat Trout in Texas. The Texas Journal of Science 43(4): 405-410.
  26. ↑ Mifflin, M.D. and Wheat, M.M., 1979. Pluvial lakes and estimated pluvial climates of Nevada. Nevada Bureau of Mines and Geology Bulletin 94. Mackay School of Mines, University of Nevada, Reno, NV. 57 pp.
  27. ↑ Oviatt, C.G., 2015. Chronology of Lake Bonneville, 30,000 to 10,000 yr B.P. Quaternary Science Reviews 110, 166-171.
  28. ↑ Eaton, Kendra R.; Loxterman, Janet L.; Keeley, Ernest R. (2018-08-10). "Connections and containers: Using genetic data to understand how watershed evolution and human activities influence cutthroat trout biogeography". PLOS ONE. 13 (8): e0202043. Bibcode:2018PLoSO..1302043E. doi: 10.1371/journal.pone.0202043 . ISSN   1932-6203. PMC   6086439 . PMID   30096159.
  29. ↑ Oviatt, C.G., 2018. Geomorphic controls on sedimentation in Pleistocene Lake Bonneville, eastern Great Basin. in Starratt, S.W. and Rosen, M.R., eds., From saline to freshwater: The diversity of western lakes in space and time. Geological Society of America Special Paper 536, p. 53–66.
  30. 1 2 3 Campbell, M., C.C. Kozfkay, A. Boone and D. Teuscher. 2007. Genetic investigations of Bonneville Cutthroat Trout in the Bear River drainage, Idaho: distribution of mitochondrial DNA diversity and Rainbow Trout hybridization and introgression. Final Report. IDFG Report Number 07-36. Idaho Department of Fish and Game. Boise, Idaho.
  31. ↑ Campbell, M.R., C.C. Kozfkay, K.A. Meyer, M.S. Powell and R.N. Williams. 2011. Historical influences of volcanism and glaciation in shaping mitochondrial DNA variation and distribution in Yellowstone Cutthroat Trout across its native range. Transactions of the American Fisheries Society 149: 91-107.
  32. ↑ Bouchard, David P.; Kaufman, Darrell S.; Hochberg, Amy; Quade, Jay (1998-08-01). "Quaternary history of the Thatcher Basin, Idaho, reconstructed from the 87Sr/86Sr and amino acid composition of lacustrine fossils: implications for the diversion of the Bear River into the Bonneville Basin". Palaeogeography, Palaeoclimatology, Palaeoecology. 141 (1): 95–114. Bibcode:1998PPP...141...95B. doi:10.1016/S0031-0182(98)00005-4. ISSN   0031-0182.
  33. ↑ Link, P.K., D.S. Kaufman and G.D. Thackray. 1999. Field guide to Pleistocene Lakes Thatcher and Bonneville and the Bonneville flood, southeastern Idaho. Pages 251–266 in S.S. Hughes and G.D. Thackray, editors. Guidebook to the geology of eastern Idaho. Idaho Museum of Natural History, Pocatello.
  34. ↑ Rogers, K. B. 2010. Cutthroat trout taxonomy: exploring the heritage of Colorado’s state fish. Pages 152–157 in R. F. Carline and C. LoSapio, editors. Wild Trout X: Sustaining wild trout in a changing world. Wild Trout Symposium, Bozeman, Montana. Available: www.wildtroutsymposium.com/proceedings.php. (January 2018).
  35. ↑ Votel, Missy. "DNA test leads to discovery of San Juan cutthroat - Durango Telegraph". www.durangotelegraph.com. Retrieved 2018-11-24.
  36. ↑ "Colorado biologists rediscover fish long thought to be extinct — then rescue them as wildfire advances". The Denver Post. 2018-09-06. Retrieved 2018-11-24.
  37. ↑ San Juan National Forest Press Release (2021-08-18). "Second phase of San Juan Cutthroat restoration scheduled for Wolf Creek headwaters".
  38. ↑ "Colorado Parks and Wildlife". Colorado Parks and Wildlife. Retrieved 2022-09-24.
  39. ↑ Thorgaard; Brunelli; Smith; Johnson (2018), Trotter; Bisson; Shultz; Roper (eds.), "Y Chromosome Marker Evolution in Cutthroat Trout", Cutthroat Trout: Evolutionary Biology and Taxonomy, American Fisheries Society, doi:10.47886/9781934874509.ch7, ISBN   978-1-934874-50-9 , retrieved 2024-08-13
  40. ↑ Trotter, Patrick C. (2008). Cutthroat: Native Trout of the West (2nd ed.). Berkeley, CA: University of California Press. p. 13. ISBN 978-0-520-25458-9.
  41. ↑ Schrank, A. J., and F. J. Rahel. 2004. Movement patterns in inland Cutthroat Trout (Oncorhynchus clarki utah): management and conservation implications. Canadian Journal of Fisheries and Aquatic Sciences 61:1528–1537.
  42. ↑ Schrank, A. J., and F. J. Rahel. 2006. Factors influencing summer movement patterns of Bonneville Cutthroat Trout (Oncorhynchus clarkii utah). Canadian Journal of Fisheries and Aquatic Sciences 63:660–669.
  43. ↑ Gresswell, B., and K. Homel. 2008. Evaluating the movement patterns of Snake River Finespotted Cutthroat Trout in the Snake River below Jackson Lake Dam, Grand Teton National Park. University of Wyoming National Park Service Research Center Annual Report 31:23–28, Laramie.
  44. ↑ Gresswell, R. E., W. J. Liss, and G. L. Larson. 1994. Life-history organization of Yellowstone Cutthroat Trout (Oncorhynchus clarki bouvieri) in Yellowstone Lake. Canadian Journal of Fisheries and Aquatic Sciences 51:298–309.
  45. ↑ Varley, J. D., and R. E. Gresswell. 1988. Ecology, status, and management of the Yellowstone Cutthroat Trout. Pages 13–24 in R. E. Gresswell, editor. Status and management of interior stocks of Cutthroat Trout. American Fisheries Society, Symposium 4, Bethesda, Maryland.
  46. ↑ White, Seth M.; Rahel, Frank J. (2008). "Complementation of Habitats for Bonneville Cutthroat Trout in Watersheds Influenced by Beavers, Livestock, and Drought". Transactions of the American Fisheries Society. 137 (3): 881–894. Bibcode:2008TrAFS.137..881W. doi:10.1577/T06-207.1. ISSN   0002-8487.
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  63. ↑ Griffith, J. S. 1972. Comparative behavior and habitat utilization of Brook Trout (Salvelinus fontinalis) and Cutthroat Trout (Salmo clarki) in small streams in northern Idaho. Journal of the Fisheries Research Board of Canada 29:265–273.
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  73. ↑ Penaluna, B. E., J. B. Dunham, S. F. Railsback, I. Arismendi, S. L. Johnson, R. E. Bilby, M. Safeeq, and A. E. Skaugset. 2015. Local variability mediates vulnerability of trout populations to land use and climate change. PLOS (Public Library of Science) ONE [online serial] 10(8):e0135334.
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  75. ↑ Roberts, J. J., K. D. Fausch, D.P. Peterson, and M. B. Hooten. 2013. Fragmentation and thermal risks from climate change interact to affect persistence of native trout in Colorado River basin. Global Change Biology 19:1383–1398.
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