The island has a land area of 137.857 sq mi (357.05 km2), making it the 43rd largest island in the United States. Its most southerly point is Cape Upright which features cliff faces which exceed 1,000 feet (300 m). Similar heights are found at Glory of Russia Cape on the north, and the highest point, 1,476 feet (450 m) above sea level, lies south from the island center.
There is a small island off its northwestern point called Hall Island. The 3.1 miles (5.0 km) wide sound between the two islands is called Sarichef Strait. A small rocky islet called Pinnacle Rock lies 9.3 miles (15.0 km) to the south of Saint Matthew Island.
The climatic conditions in the entire Bering Sea Area, according to National Climatic Data Center (1986), is reported as maritime with "considerable wind and cool, humid and cloudy conditions" with mean annual temperature of 37.8 °F (3.2 °C) and annual precipitation of 15.3 in (390 mm) on St. Matthew Island. The geological formation recorded on St. Matthew Island consists of calc-alkalinevolcanic rocks of Late Cretaceous and earliest tertiary age with Pergelic Cryaquolls and Pergelic Cryoborolls soil types.[1]
Human habitation
The first recorded attempt at settlement occurred in 1809, when a Russian group led by Demid Ilyich Kulikalov, under the guise of the Russian-American Company, established an experimental outpost.[2]
A 2013 sailing expedition to the island showed that, in spite of the lack of human habitation, extensive areas of beach were heavily contaminated with plastic marine debris, particularly from the fishing industry.[3]
Reindeer introduced to St. Matthew Island in 1944 increased from 29 animals at that time to 6,000 in the summer of 1963, a drastic overshoot of the island's carrying capacity causing a crash die-off the following winter to 42 animals. Based on the size of the island, recent estimates put the carrying capacity at about 1,670 animals [Klein, D. R. (n.d.). The Introduction, Increase, and Crash of Reindeer on St. Matthew Island. Retrieved May 25, 2016, from https://web.archive.org/web/20110709032911/http://dieoff.org/page80.htm].
In 1944, 29 reindeer were introduced to the island by the United States Coast Guard to provide an emergency food source. The Coast Guard abandoned the island a few years later, leaving the reindeer. Subsequently, the reindeer population rose to about 6,000 by 1963[6] and then died off in the next two years to 42 animals.[7] A scientific study attributed the population crash to the limited food supply in interaction with climatic factors (the winter of 1963–64 was exceptionally severe in the region).[1] By the 1980s, the reindeer population had completely died out.[2] Environmentalists see this as an issue of overpopulation. For example, ecologist Garrett Hardin cited the "natural experiment" of St. Matthew Island of the reindeer population explosion and collapse as a paradigmatic example of the consequences of overpopulation in his essay An Ecolate View of the Human Predicament.[8]
Birds
Despite its high latitude, St. Matthew Island contains significant populations of endemic and migratory birds. In fact, the Department of the Interior has called the island "one of the richest seabird nesting colonies in the world", with over 5 million seabirds nesting during breeding season.[9] Over 140 different species of birds have been identified on the island.[10] The island, along with its small satellites Hall Island and Pinnacle Rock, contains the entire breeding range of McKay's Bunting.[11] Additionally, a subspecies of Rock Sandpiper (Calidris ptilocnemis ptilocnemis) and a subspecies of Gray-crowned Rosy-Finch (Leucosticte tephrocotis umbrina) breed only on the island and the nearby Pribilof Islands.[10][11] Both McKay's Bunting and Calidris ptilocnemis ptilocnemis, with their restricted breeding ranges, are among the rarest birds in North America, making their preservation among the top priorities for conservation groups.[10]
Fish
There are two major lakes on the island, North Lake and Big Lake. The lakes contain a greater number of fish species (at least 5) than other nearby islands.[12]
Lichen
Lichen studies were conducted on the island in the 1990s to prepare a list of lichens with their habitat, composition and distribution pattern. These studies were considered important for characterizing the eating habits of caribou and air quality. The vegetation of the islands has been classified as wet, moist and alpine tundra, based on landforms and drainage patterns. The plant communities were attributed to five categories. In the area of rock rubble fields and high ridges the vegetation was mainly crustose lichens. Among the 148 lichen species of the islands, 125 showed the Arctic–alpine geographic distribution, 74 boreal, 18 were coastal, 9 amphi-Berengian and 41 widespread, with many species falling into more than one category. The lichen diversity was characterized by wide-ranging Arctic–alpine and boreal species; it was evaluated as luxuriant that was linked to reindeer species disappearing from the area.[1]
^David R. Klein, "The Introduction, Increase, and Crash of Reindeer on St. Matthew Island", Alaska Cooperative Wildlife Research Unit, University of Alaska Archived 2011-07-09 at the Wayback Machine. Dieoff.org. Retrieved on 2011-06-25.
^Marc Romano; David Klein; Anthony DeGange; Steve Delehanty; Monte Garroutte; Dennis Griffin; Richard Kleinleder; Derek Sikes; heather Renner (December 2013). "REPORT OF 2012 EXPEDTION TO ST. MATTHEW AND OTHER BERING SEA ISLANDS"(PDF). U.S. Fish and Wildlife Service. p. 9. Archived from the original(PDF) on 22 March 2016. Retrieved 29 July 2014.
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