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Jarvis Island

Coral island in the South Pacific Ocean

  • 9 min read
  • 5 chapters
Jarvis island
NASA · Public domain

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Through World War II, Rain and Habitat

Jarvis is one of the Line Islands and, for statistical purposes, is also grouped as one of the United States Minor Outlying Islands. Jarvis Island is the largest of three U.S. equatorial possessions, which include Baker Island and Howland Island.

The United States claimed it in the 19th century and mined it for guano. In the 20th century, it was the subject of a small settlement. It was attacked during World War II and evacuated, leaving some buildings and a day beacon. In modern times, it is managed as a nature reserve.

Geography and ecology

While a few offshore anchorage spots are marked on maps, Jarvis Island has no ports or harbors, and swift currents are a hazard. There is a boat landing area in the middle of the western shoreline near a crumbling day beacon and another near the island's southwest corner. The center of Jarvis island is a dried lagoon where deep guano deposits accumulated, which were mined for about 20 years during the nineteenth century. The island has a tropical desert climate, with high daytime temperatures, constant wind, and intense sun. Nights, however, are quite cool. The ground is mostly sandy and reaches 23 feet (7.0 meters) at its highest point. The low-lying coral island has long been noted as hard to sight from small ships and is surrounded by a narrow fringing reef.

Jarvis Island is one of two United States territories that are in the Southern Hemisphere (the other is American Samoa). Located only 25 miles (40 km) south of the equator, Jarvis has no known natural freshwater lens and scant rainfall. This creates a very bleak, flat landscape without any plants larger than shrubs. There is no evidence that the island has ever supported a self-sustaining human population. Its sparse bunch grass, prostrate vines, and low-growing shrubs are primarily a nesting, roosting, and foraging habitat for seabirds, shorebirds, and marine wildlife.

Jarvis Island was submerged during the latest interglacial period, roughly 125,000 years ago, when sea levels were 5 to 10 meters (16 to 33 ft) higher than today. As the sea level declined, the horseshoe-shaped lagoon formed in Jarvis Island's center.

Topographic isolation

Jarvis Island's highest point has a topographic isolation of 380.57 kilometers (236.48 mi; 205.49 nmi), with Joe's Hill on Kiritimati being the nearest higher neighbor.

Time zone

Jarvis Island is located in the Samoa Time Zone (UTC -11:00), the same time zone as American Samoa, Kingman Reef, Midway Atoll, and Palmyra Atoll.

Birds

Jarvis Island once held some of the largest seabird breeding colonies in the tropical ocean. Still, guano mining and the introduction of rodents have ruined much of the island's native wildlife. Eight breeding species were recorded in 1982, compared to thirteen in 1996 and fourteen in 2004. The Polynesian storm petrel had made its return after over 40 years of absence from Jarvis Island, and the number of brown noddies multiplied from just a few birds in 1982 to nearly 10,000. Just twelve spectacled terns were recorded in 1982, but by 2004, over 200 nests were found there. The island, with its surrounding marine waters, has been recognized as an Important Bird Area (IBA) by BirdLife International because it supports colonies of lesser frigatebirds, brown and masked boobies, red-tailed tropicbirds, Polynesian storm petrels, blue noddies and sooty terns, as well as serving as a migratory stopover for bristle-thighed curlews.

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