Wildlife of the Channel Islands of California

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The wildlife of the Channel Islands of California is wide and diverse, including many endemic species. While the land wildlife is slightly limited, there being only one large, naturally predatory, and native mammal, the small island fox, marine life can include anything from kelp forests to great white sharks.

Contents

Flora

An island oak on Santa Rosa Island. Island Oak in Santa Rosa Island.jpg
An island oak on Santa Rosa Island.
A North Pacific right whale off Anacapa Island 20170505 NPRW - Kelping 13.jpg
A North Pacific right whale off Anacapa Island

Flora on the Channel Islands include endemic subspecies of pine, oak, and the island tree mallow. Santa Rosa Island holds two groves of the Torrey pine subspecies Pinus torreyana var. insularis, which is endemic to the island. Torrey pines are the United States' rarest pine species. [1] The islands also house many rare and endangered plants, including the island barberry, the island rushrose, and the Santa Cruz Island lace pod. Giant kelp forests surround the islands and act as a source of nutrition and protection for other animals. [2]

Invasive species, such as the Australian blue gum tree, olive tree, sweet fennel and Harding grass threaten native species through competition for light, nutrients, and water. The Australian blue gum, for example, releases toxins in its leaf litter which prevent other species of plants from growing in the soil surrounding it. The blue gum, as well as other species including the Harding grass, are much more flammable and better adapted to wildfires than native species. [3]

Kelp forests and many species of seaweed, sea urchin, and other marine plants live on the ocean floor.

Fauna

An island fox prowls near a campsite.

In the waters of the Channel Islands, sea lions are very common. Sharks like great whites, bulls, and tigers roam the seas. Orcas also appear near the Channel Islands. A colony of mostly western gulls lived on Anacapa Island.

The Channel Islands and surrounding waters hold many endemic species and subspecies of animals, including fauna such as the Channel Islands deer mouse, the Channel Islands spotted skunk, island scrub jay, San Clemente loggerhead shrike, and San Clemente Bell's sparrow. Many species of large marine mammals, including Pacific gray whales, blue whales, humpback whales, and California sea lions breed or feed close to the Channel Islands. It is unknown if critically endangered North Pacific right whales, and historically abundant Steller's sea lions are present. Seabirds, including western gulls, bald eagles, pigeon guillemots, and Scripps's murrelets use the islands as well for shelter and breeding grounds. The endemic island fox is California's smallest natural canine and has rebounded from its near extinction in the late 1990s. Several endemic reptile species, including the island fence lizard and island night lizard, live on the islands, as well as the endemic amphibian the Channel Islands slender salamander . [5]

Non-native species can include feral cows, sheep, and pigs.

Food chain

A night time shot of an island fox with three mice in its jaws. Urocyon littoralis with prey*corrected*.jpg
A night time shot of an island fox with three mice in its jaws.

The lowest on the food chain are the plants. Deer mice and small vermin, like the spotted skunk, follow, along with insects, lizards, and small birds, mammals and fish.

The predatory animals include sharks, orcas (an apex predator), eagles, and foxes.

The island fox eats fruits, insects, birds, eggs, crabs, lizards, and small mammals, including deer mice. [6] [7]

Land mammals

Native

There are only three native land mammals on the archipelago: The island deer mouse, the island spotted skunk, and the island fox.

Deer mouse

The deer mouse exists on all five islands. It can survive in conditions with a significant lack of fresh water, for example, Santa Barbara and Anacapa islands, the two Channel Islands without rivers.

Spotted skunk

An island spotted skunk Spilogale gracilis amphiala.jpg
An island spotted skunk

The spotted skunk is only confirmed to exist on Santa Cruz Island and Santa Rosa Island. It used to be confirmed to exist on a third island, San Miguel Island, but is now presumed, but not confirmed, extirpated from there. Santa Cruz Island houses some skunks, however, Santa Rosa Island is home to over three thousand.

Island fox

The island fox is the largest native land mammal, existing on three of the five Channel Islands: Santa Cruz, Santa Rosa, and San Miguel. It does not exist on the Santa Barbara and Anacapa islands, though, due to the lack of fresh water.

Related Research Articles

<span class="mw-page-title-main">Anacapa Island</span> Island of the Channel Islands in California, United States

Anacapa Island is a small volcanic island located about 11 miles off Port Hueneme in Ventura County, California. The island is composed of a series of narrow islets 6 mi (10 km) long, oriented generally east–west and 5 mi (8 km) east of Santa Cruz Island. The three main islets, East, Middle and West Anacapa, have precipitous cliffs, dropping off steeply into the sea.

<span class="mw-page-title-main">Channel Islands (California)</span> Archipelago off the coast of southern California, US

The Channel Islands are an eight-island archipelago located within the Southern California Bight in the Pacific Ocean, off the coast of California. They define the Santa Barbara Channel, which sits between the islands and the California mainland. The four Northern Channel Islands are part of the Transverse Ranges geologic province, and the four Southern Channel Islands are part of the Peninsular Ranges province. Five of the islands are within the Channel Islands National Park, and the waters surrounding these islands make up Channel Islands National Marine Sanctuary. The Nature Conservancy was instrumental in establishing the Channel Islands National Marine Sanctuary.

<span class="mw-page-title-main">Channel Islands National Park</span> National park in California, United States

Channel Islands National Park consists of five of the eight Channel Islands off the Pacific coast of the U.S. state of California. Although the islands are close to the shore of the densely populated state, they have been relatively undeveloped. The park covers 249,561 acres (100,994 ha), of which 79,019 acres (31,978 ha) are federal land.

<span class="mw-page-title-main">Island fox</span> Species of fox

The island fox is a small fox species that is endemic to six of the eight Channel Islands of California. There are six subspecies, each unique to the island it lives on, reflecting its evolutionary history. They are generally docile, show little fear of humans, and are easily tamed. Island foxes played an important role in the spiritual lives of native Channel Islanders. They have been likely semi-domesticated as pets, used as pelts, or for other functions, like pest control.

<span class="mw-page-title-main">Santa Cruz Island</span> Largest island of the Channel Islands in California, United States

Santa Cruz Island is located off the southwestern coast of Ventura, California, United States. It is the largest island in California and largest of the eight islands in the Channel Islands archipelago and Channel Islands National Park. Forming part of the northern group of the Channel Islands, Santa Cruz is 22 miles (35 km) long and 2 to 6 miles wide with an area of 61,764.6 acres (249.952 km2).

<span class="mw-page-title-main">San Clemente Island</span> Island of the Channel Islands in California, United States

San Clemente Island is the southernmost of the Channel Islands of California. It is owned and operated by the United States Navy, and is a part of Los Angeles County. It is administered by Naval Base Coronado. It is 21 miles (34 km) long and has 147.13 km2 (56.81 sq mi) of land. The 2018 census estimates 148 military and civilian personnel reside on the island. The city of San Clemente in Orange County, California is named after the island.

<span class="mw-page-title-main">Torrey pine</span> Species of pine tree in California

The Torrey pine is a rare pine species in California, United States. It is a critically endangered species growing only in coastal San Diego County, and on Santa Rosa Island, offshore from Santa Barbara in Santa Barbara County. The Torrey pine is endemic to the California coastal sage and chaparral ecoregion.

<span class="mw-page-title-main">Torrey Pines State Natural Reserve</span> State park in California

Torrey Pines State Natural Reserve is 2,000 acres (810 ha) of coastal state park located in San Diego, California, off North Torrey Pines Road. Although it is located within San Diego city limits, it remains one of the wildest stretches of land (8 km²) on the Southern California coast. It is bordered immediately on the south by Torrey Pines Municipal Golf Course and on the north by the city of Del Mar. The reserve was designated a National Natural Landmark in 1977.

<span class="mw-page-title-main">Santa Barbara Channel</span> Pacific Ocean separating California from northern Channel Islands

The Santa Barbara Channel is a portion of the Southern California Bight and separates the mainland of California from the northern Channel Islands. It is generally south of the city of Santa Barbara, and west of the Oxnard Plain in Ventura County.

<span class="mw-page-title-main">Santa Rosa Island (California)</span> Island of the Channel Islands in California, United States

Santa Rosa Island is the second largest of the Channel Islands of California at 53,195 acres. Santa Rosa is located about 26 miles (42 km) off the coast of Santa Barbara, California in Santa Barbara County and is part of Channel Islands National Park.

<span class="mw-page-title-main">Island scrub jay</span> Species of bird

The island scrub jay, also known as the island jay or Santa Cruz jay, is a bird in the genus, Aphelocoma, which is endemic to Santa Cruz Island off the coast of Southern California. Of the over 500 breeding bird species in the continental U.S. and Canada, it is the only insular endemic landbird species.

<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">Southern California Bight</span> Curved stretch of coastline in Southern California and northwestern Baja California

The Southern California Bight is a 692-kilometer-long stretch of curved coastline that runs along the west coast of the United States and Mexico, from Point Conception in California to Punta Colonet in Baja California, plus the area of the Pacific Ocean defined by that curve. This includes the Channel Islands of California and the Coronado Islands and Islas de Todo Santos of Baja California.

<span class="mw-page-title-main">Fauna of the United States</span> Native animals of the United States

The fauna of the United States of America is all the animals living in the Continental United States and its surrounding seas and islands, the Hawaiian Archipelago, Alaska in the Arctic, and several island-territories in the Pacific and in the Caribbean. The U.S. has many endemic species found nowhere else on Earth. With most of the North American continent, the U.S. lies in the Nearctic, Neotropic, and Oceanic faunistic realms, and shares a great deal of its flora and fauna with the rest of the American supercontinent.

<span class="mw-page-title-main">Los Peñasquitos Canyon Preserve</span>

Los Peñasquitos Canyon Preserve is an urban park in San Diego, California. Stretching approximately 7 miles (11 km), the park encompasses some 4,000 acres (16 km2) of both Peñasquitos and Lopez canyons, and is one of the largest urban parks in the United States. The preserve is jointly owned and administered by the City of San Diego and the County of San Diego.

<span class="mw-page-title-main">California coastal sage and chaparral</span> Mediterranean forests, woodlands, and scrub ecoregion in Mexico and the United States

The California coastal sage and chaparral is a Mediterranean forests, woodlands, and scrub ecoregion, defined by the World Wildlife Fund, located in southwestern California and northwestern Baja California (Mexico). It is part of the larger California chaparral and woodlands ecoregion. The ecoregion corresponds to the USDA Southern California ecoregion section 261B, and to the EPA Southern California/Northern Baja Coast ecoregion 8.

<span class="mw-page-title-main">Fauna of California</span> Flora and fauna of the US state of California

The fauna of the State of California may be the most diverse in the United States of America. Of the Lower 48 conterminous states, California has the greatest diversity in climate, terrain and geology in general. The state's six life zones are the lower Sonoran (desert); upper Sonoran ; transition ; and the Canadian, Hudsonian, and Arctic zones, comprising California's highest elevations. California’s diverse geography gives rise to dozens of different ecosystems, each of which has its own unique native plants and animals. California is a huge state, the 3rd largest in the U.S., and can range broadly in habitat type.

<span class="mw-page-title-main">Anacapa State Marine Reserve</span> Marine reserve in the United States

The Anacapa State Marine Reserve (SMR) is a protected marine reserve located off the coast of Southern California, encompassing the area of water immediately north of Anacapa Island. Established to safeguard the marine ecosystems and biodiversity of the region, the reserve is one of the thirteen Marine Protected Areas (MPAs) of the larger Channel Islands National Park network.

References

  1. Farjon, A. (2013). "Pinus torreyana subsp. torreyana". IUCN Red List of Threatened Species . 2013: e.T34015A2840365. doi: 10.2305/IUCN.UK.2013-1.RLTS.T34015A2840365.en . Retrieved 11 November 2021. Listed as endangered (EN C2b)
  2. "Kelp Forests – Channel Islands National Park (U.S. National Park Service)". Channel Islands National Park. U.S. National Park Service. Retrieved 9 May 2015.
  3. "Terrestrial Invasive – Channel Islands National Park (U.S. National Park Service)". Channel Islands National Park. U.S. National Park Service. Retrieved 9 May 2015.
  4. C.Michael Hogan (2008) Torrey Pine: Pinus torreyana, Globaltwitcher, ed. Nicklas Stromberg
  5. "Animals – Channel Islands National Park (U.S. National Park Service)". Channel Islands National Park. U.S. National Park Service. Retrieved 9 May 2015.
  6. Moore, C.M. and Collins, P.W. (1995). "Urocyon littoralis" (PDF) 489: 1–7.
  7. "Archived copy" (PDF). Archived from the original (PDF) on 2012-01-22. Retrieved 2016-02-02.{{cite web}}: CS1 maint: archived copy as title (link)