Cicindela ohlone

Last updated

Ohlone tiger beetle
Cicindela ohlone.jpg
Status TNC G1.svg
Critically Imperiled  (NatureServe) [1]
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Coleoptera
Family: Cicindelidae
Genus: Cicindela
Species:
C. ohlone
Binomial name
Cicindela ohlone
Freitag & Kavanaugh, 1993

Cicindela ohlone, the Ohlone tiger beetle, is endemic to California. It was discovered in 1987 and named and described in 1993. [4] C. ohlone is most closely related to Cicindela purpurea .

Contents

Cicindela ohlone ranges in length from 9+12 to 12+12 millimetres (0.37 to 0.49 in) with the females at the higher end of the range. The body is a bright, sericate green with bronze tints on the dorsum and the elytra. C. ohlone differs from other purpurea in that it has a larger body size, different genital morphology and different seasonal activity cycle. [4]

Habitat

Cicindela ohlone is endemic to Santa Cruz County, California which is the southernmost habitat of tiger beetles in the purpurea group. They are allopatric relative to other purpurea. C. ohlone are found on coastal terraces in remnant patches of native California coastal prairie grasslands with poorly drained clay or sandy clay over Santa Cruz mudstone. This soil becomes hard packed in late spring and summer which is an important feature for the activities of the beetle. Foraging, mating, and egg-laying often occur in these open spaces. [4]

Ecology

Cicindela ohlone complete their life cycle in two years, or in rare cases, one year. After mating and subsequent fertilization, the female tiger beetle deposits the egg several millimeters under the ground. The egg hatches into a larva that creates a burrow. The larva will feed on prey that pass by the burrow until it forms a pupa and finally emerges as an adult. [5]

Cicindela ohlone are predators and feed on many different species of arthropods. C. ohlone capture prey either in active chases with brief intermittent pauses or by waiting in shady areas and grabbing prey with their mandibles as it approaches. [4] The primary predators of tiger beetles are birds, lizards and other insects; however it is not yet known if C. ohlone have these same predators. To avoid becoming prey the beetle escapes by quick flights or running aided by the beetle's exceptional vision. Predation has not yet been studied for C. ohlone larvae, but tiger beetle larvae are hunted by ground-foraging woodpeckers, ants, and wasps. Their most important predators are parasitoid wasps and flies that lay their eggs in the beetle larva. The tiger beetle larva is then consumed by the wasp or fly larvae, which then emerge from the burrow as adults. [5]

Cicindela ohlone is active during the late winter and spring. This differs from all other tiger beetles species who are active in summer or in spring and fall. [5]

Endangered species listing

On October 3, 2001, C. ohlone was registered as an endangered species under the Endangered Species Act of 1973. [3] The following factors were listed as threats to the C. ohlone: habitat fragmentation and destruction due to urban development, habitat degradation from invasion of nonnative vegetation, and vulnerability to local extirpation from random events. C. ohlone habitat is restricted to remnant patches of native grasslands on coastal terraces over a firm level substrate. This type of site is also great for building homes with views of the Pacific Ocean. For this reason much of the habitat of the C. ohlone has already been developed or is in danger of being developed. C. ohlone habitat has been affected by encroachment of nonnative vegetation which create a dense, shady over-story. Low, spare vegetation with open spaces is required for the beetle to forage and lay eggs. According to the Fish and Wildlife Service, "without management efforts to reduce and control vegetation encroachment by nonnative species, C. ohlone will likely decline and may become extirpated in all of the locations where the species is known presently" . [3] :50346 Invasion of nonnative vegetation also changes the populations of beetle predators, prey and parasites. [3]

Unrestricted collecting, recreational use of habitat, and pesticides were cited as threats. Tiger beetles are highly sought after by collectors because they are attractive and exhibit great diversity in color and markings from species to species. Paths used by hikers and mountain bikers are used by the beetle in their open space activities, such as attacking prey and mating. Burrows built by C. ohlone can be crushed by traffic on these paths, as can the beetles themselves. Pesticides used by local land owners can be transported by air or water and kill the beetles unintentionally. The Fish and Wildlife Service determined that the species is in danger “throughout all or a significant portion of its range” and listed C. ohlone for protection under the Endangered Species Act. [3] :50344

Conservation efforts

One of the populations of C. ohlone is located in the grassland patch of Marshall field in the upper campus of the University of California, Santa Cruz. Trails through the patch serve as open space needed by C. ohlone, but are also used by mountain bikers. During C. ohlone mating season temporary fences have been put up to block off the trails to protect the beetles since 2003 on nearby California State Parks' property. On both UC Santa Cruz and State Parks' property, controlled burns in this area have reduced the density of vegetation in an effort to provide better suited habitat for C. ohlone. Additionally, the City of Santa Cruz has restored cattle grazing on its Moore Creek Preserve; the rancher overseeing the cattle has adjusted grazing in such a way to restore Ohlone tiger beetle habitat. Effects of these efforts are not well known, though the State Parks' and Santa Cruz City Moore Creek Greenbelt populations of the species has been maintained whereas most other populations have declined. More research will need to be done to effectively protect C. ohlone.

Despite its legal protection, landowners continue to threaten the species. One landowner apparently maliciously destroyed habitat after being told about sensitive locations of the species' burrows. Another landowner purposefully removed cattle grazing in order to reduce habitat quality with the hope of more readily developing their land. Still another landowner has allowed trespass and habitat destruction. Finally, a private landowner destroyed acres of core habitat by developing a vineyard just before the species was listed.

Even conservation lands owners have added to the species' decline: one park agency spread gravel extensively over larval habitat of the species in an effort to 'improve' trails; still another agency removed horse grazing, re-routed public access, and stopped beneficial management practices, extirpating this important population.

Even though all of the aforementioned detrimental activities have been well documented and dutifully reported to regulatory agencies, no agency has taken enforcement action against the perpetrators, leading to grave doubts if this species can be saved from extinction.

Related Research Articles

<span class="mw-page-title-main">Hydrophilidae</span> Family of beetles

Hydrophilidae, also known colloquially as water scavenger beetles, is a family of beetles. Aquatic hydrophilids are notable for their long maxillary palps, which are longer than their antennae. Several of the former subfamilies of Hydrophilidae have recently been removed and elevated to family rank; Epimetopidae, Georissidae, Helophoridae, Hydrochidae, and Spercheidae. While the majority of hydrophilids are aquatic, around a third of described species are terrestrial, mostly belonging to the subfamily Sphaeridiinae.

<span class="mw-page-title-main">Island spotted skunk</span> Subspecies of carnivore

The island spotted skunk is an insular endemic carnivore and a subspecies of the western spotted skunk. Little is known about their exact variations from the mainland spotted skunk and variations between locations, resolution of which awaits further genetic and morphologic evaluation. The skunk is only currently found on two islands off the southern coast of California. Its presence has been recorded on San Miguel Island, but it has since been declared extinct in that area. The Channel Island skunk is one of two terrestrial carnivores on the islands, the other being the island fox. It is designated as a species of special concern by the state of California.

<span class="mw-page-title-main">Salt Creek tiger beetle</span> Subspecies of beetle

The Salt Creek tiger beetle is a critically endangered subspecies of tiger beetle endemic to the saline wetlands of northern Lancaster County, Nebraska, adjacent to and immediately to the north of the city of Lincoln. It is a predatory insect, using its mandibles to catch other insects. The beetle is one of the rarest insects in North America; surveys showed that 194 adults existed in 2009, down from 263 in 2008, and 777 in 2000. However, efforts are continuing to boost the population, which in 2013 numbered 365 beetles: one beetle for each day in a regular year.

<span class="mw-page-title-main">Houston toad</span> Species of amphibian endemic to Texas, US

The Houston toad, formerly Bufo houstonensis, is an endangered species of amphibian that is endemic to Texas in the United States. This toad was discovered in the late 1940s and named in 1953. It was among the first amphibians added to the United States List of Endangered Native Fish and Wildlife and is currently protected by the Endangered Species Act of 1973 as an endangered species. The Houston toad was placed as "endangered" on the IUCN Red List of Threatened Species from 1986 to 2022, and has worsened to "critically endangered" since then, with fewer than 250 mature individuals believed to remain in the wild as of 2021. Their kind is threatened every day as they continue to suffer from a loss of habitat, extreme drought, and massive wildfires. Their typical life expectancy is at least 3 years but it may exceed this number.

<span class="mw-page-title-main">California coastal prairie</span> Plant community in California

California coastal prairie, also known as northern coastal grassland, is a grassland plant community of California and Oregon in the temperate grasslands, savannas, and shrublands biome. It is found along the Pacific Coast, from as far south as Los Angeles in Southern California to southern Oregon.

<span class="mw-page-title-main">Black-tailed prairie dog</span> Species of rodent

The black-tailed prairie dog is a rodent of the family Sciuridae found in the Great Plains of North America from about the United States-Canada border to the United States-Mexico border. Unlike some other prairie dogs, these animals do not truly hibernate. The black-tailed prairie dog can be seen above ground in midwinter. A black-tailed prairie dog town in Texas was reported to cover 25,000 sq mi (64,000 km2) and included 400,000,000 individuals. Prior to habitat destruction, the species may have been the most abundant prairie dog in central North America. It was one of two prairie dogs described by the Lewis and Clark Expedition in the journals and diaries of their expedition.

<span class="mw-page-title-main">Arroyo toad</span> Species of amphibian

The arroyo toad is a species of true toads in the family Bufonidae, endemic to California, U.S. and Baja California state, Mexico. It is currently classified as an Endangered species on the IUCN Red List of Threatened Species because of habitat destruction.

<i>Cicindela sexguttata</i> Species of beetle

The six-spotted tiger beetle, also known as the six-spotted green tiger beetle, is a common North American species of Tiger beetles in the Cicindelinae subfamily. It is common in many areas of the states, and is well known. It is recognized for its bright green color and its flight pattern. The beetle is largely harmless to humans and may live as long as three years.

<i>Neocicindela tuberculata</i> Species of beetle

Neocicindela tuberculata is a species of tiger beetle in the family Cicindelidae, endemic to New Zealand. Its common names include common tiger beetle, moeone, and papapa, and in its laval stage penny doctor, butcher boy, kapuku, kui, kurikuri, moeone, and muremure. Neocicindela tuberculata was the first carabid beetle described from New Zealand. The species can run as fast as 5 miles per hour and are considered to be the fastest running beetles. Adult species prefer clay banks in summer and are good predators when in comes to insects.

<i>Apodemia mormo langei</i> Subspecies of butterfly

Apodemia mormo langei, the Lange's metalmark butterfly, is an endangered North American butterfly. It is a subspecies of the Mormon metalmark and belongs to the family Riodinidae. The butterfly is endemic to California, where it is known from one strip of riverbank in the San Francisco Bay Area. A 2008 count estimated the total remaining population at 131 individuals. Since 2011, this number has dropped to about 25–30.

<span class="mw-page-title-main">Myrtle's silverspot</span> Subspecies of butterfly

Myrtle's silverspot is a medium-sized butterfly in the brush foot family (Nymphalidae), an endangered subspecies of the zerene fritillary. It is endemic to California, where it is known from only about four locations just north of the San Francisco Bay Area, including two at Point Reyes National Seashore. Its wingspan is approximately 2.2 inches (56 mm). The upper surfaces of the wings are golden brown with numerous black spots and lines. The undersides are brown, orange and tan with black lines and silver and black spots. Larvae are dark colored with many sharp branching spines on their backs. Myrtle's silverspot is larger and paler than the closely related Behrens' silverspot, which is now limited to the vicinity of Point Arena in Mendocino County. Myrtle's silverspot is also closely related to the Oregon silverspot.

<span class="mw-page-title-main">Valley elderberry longhorn beetle</span> Subspecies of beetle

The valley elderberry longhorn beetle is a subspecies of longhorn beetle native to the riparian forests of the Central Valley of California from Redding to Bakersfield. It is listed as a federally threatened species; a proposal to delist the insect was withdrawn in 2014.

Cicindela columbica is a species of beetle in the tiger beetle family, Cicindelidae, known commonly as the Columbia River tiger beetle. It is endemic to Idaho in the United States.

<i>Cicindela puritana</i> Species of beetle

The Puritan tiger beetle is a tiger beetle found in North America. Puritan tiger beetles are found in sandy beaches and rocky cliffs along rivers in Massachusetts, Maryland, and Connecticut. Little is known about this species due to its small geographic range and quickly disappearing populations.

<span class="mw-page-title-main">Conservation grazing</span> Use of animals to graze areas like nature reserves to maintain habitats

Conservation grazing or targeted grazing is the use of semi-feral or domesticated grazing livestock to maintain and increase the biodiversity of natural or semi-natural grasslands, heathlands, wood pasture, wetlands and many other habitats. Conservation grazing is generally less intensive than practices such as prescribed burning, but still needs to be managed to ensure that overgrazing does not occur. The practice has proven to be beneficial in moderation in restoring and maintaining grassland and heathland ecosystems. The optimal level of grazing will depend on the goal of conservation, and different levels of grazing, alongside other conservation practices, can be used to induce the desired results.

<i>Cicindela albissima</i> Species of beetle

Cicindela albissima, commonly called the Coral Pink Sand Dunes tiger beetle is a species of tiger beetle endemic to Coral Pink Sand Dunes State Park in southern Utah, United States. It was originally described by Rumpp in 1962 as the subspecies Cicindela limbata albissima, but mitochondrial DNA, along with the species' morphological and geographical distinctiveness, have shown that it is a separate species. C. albissima can be distinguished from other Cicindela species by its restricted range and lack of pigmentation on its elytra.

<i>Habroscelimorpha dorsalis</i> Species of beetle

Habroscelimorpha dorsalis, commonly known as the eastern beach tiger beetle, is a species of flashy tiger beetle in the family Cicindelidae. It is found in Central America and North America.

The Alameda whipsnake, also known as the Alameda striped racer, is a threatened subspecies of California whipsnake. It is a colubrid snake distinguishable by its broad head, large eyes, black and orange coloring with a yellow stripe down each side, and slender neck. The California whipsnake is found in California's northern and coastal chaparral. The Alameda whipsnake is a wary creature known for its speed and climbing abilities utilized when escaping predators or hunting prey. In winter months, the Alameda whipsnake hibernates in rock crevices and rodent burrows.

<i>Habroscelimorpha dorsalis dorsalis</i> Subspecies of beetle

Cicindela dorsalis dorsalis, commonly known as the Northeastern beach tiger beetle, is the largest subspecies of Eastern beach tiger beetle. In 2012, Cicindela dorsalis dorsalis was reclassified under the name Habroscelimorpha dorsalis dorsalis, but the names are used synonymously in recently published literature. Fitting to its name, the Northeastern beach tiger beetle dwells along the U.S. northeast coast in small sand burrows. The beetle is diurnal and can be spotted by its light tan coloring with dark lines and green hues on its thorax and head.

<i>Rivacindela hudsoni</i> Species of beetle

Rivacindela hudsoni is an Australian species of the family Cicindelinae or "tiger beetle" and is the fastest-running known insect. The genus Rivacindela is contentiously treated as a subgenus of the broader Cicindela and are typically found in saline habitats such as dry salt lakes and salt streams and are flightless. The species was discovered in South Australia and described in 1997, with an adult form of approximately 20–21mm in length and a running speed of 2.49 m/s, or 120 body lengths per second.

References

  1. NatureServe (7 April 2023). "Cicindela ohlone". NatureServe Network Biodiversity Location Data accessed through NatureServe Explorer. Arlington, Virginia: NatureServe. Retrieved 19 April 2023.
  2. "Ohlone tiger beetle (Cicindela ohlone)". Environmental Conservation Online System. U.S. Fish & Wildlife Service. Retrieved 19 April 2023.
  3. 1 2 3 4 5 66 FR 50340
  4. 1 2 3 4 Freitag, Richard; Kavanaugh, David H. & Morgan, Randall (1993). "A new species of Cicindela (Cicindela) (Coleoptera: Carabidae: Cicindelini) from remnant native grassland in Santa Cruz County, California". The Coleopterists Bulletin . 47 (2): 113–120. JSTOR   4008856.
  5. 1 2 3 D. Pearson; B. Knisley & C. J. Kazilek (2006). A Field Guide to the Tiger Beetles of the United States and Canada . New York: Oxford University Press. ISBN   0-19-518156-5.