Santiago Island (Galápagos)

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Santiago Island
Santiago Island is located in Galápagos Islands
Santiago Island
Santiago Island
Geography
LocationGalápagos Islands, Ecuador
Coordinates0°15′09″S 90°43′05″W / 0.252364°S 90.717952°W / -0.252364; -90.717952Coordinates: 0°15′09″S 90°43′05″W / 0.252364°S 90.717952°W / -0.252364; -90.717952
ArchipelagoGalápagos Islands
Highest elevation906 m (2972 ft)
Highest pointCerro Pelado
Administration
Demographics
Population0
View of Santiago Island with south west at top (center)
Topographic map

Santiago Island (Spanish pronunciation: [sanˈtjaɣo]) is one of the Galápagos Islands.[1] It is also known as San Salvador, named after the first island discovered by Columbus in the Caribbean Sea (see San Salvador Island), or as James Island. The island, which consists of two overlapping volcanoes, has an area of 585 square kilometers (226 sq mi) and a maximum altitude of 907 meters (2,976 ft), atop the northwestern shield volcano. The volcano in the island's southeast erupted along a linear fissure, and is much lower. The oldest lava flows on the island date back to 750,000 years ago.[2]

Geology[edit]

Tuff cone on the east side of the island
Cracked hardened lava flow on the island
Panorama of the east side (Note the older sand & vegetation in the background and newer hardened lava in the foreground)

Santiago Island was formed from a shield volcano eponymously named Santiago.[3] The low, flat summits of the volcano allowed the low-viscosity lava to flow for large distances from the source vents.[4] The volcanic origin of the island has led it to be dotted with holocene pyroclastic rock that can be found across the island.[5] On the eastern and western sides of the island, tuff cones, formed from the rapid interaction of hot lava and water, are visible.[6] The summit of the volcano is on the northwestern part of the island and the last recorded volcanic activity on Santiago Island was between 1904 and 1906.[7]

Wildlife[edit]

Land Iguana basking in the sun
Galápagos Sea Lion napping between hardened lava formations
Sally Lightfoot Crab (Grapsus Grapsus) on Santiago

Like the other islands of the Galápagos archipelago, Santiago Island is rife with wildlife, particularly species endemic to the Galápagos. Some animals commonly seen on the island include the Galápagos Fur Seal, Galápagos Sea Lion, Sally Lightfoot Crab, Marine Iguana and Galápagos Land Iguana, Bottlenose Dolphin, Rice Rat, and Microlophus.[8] Charles Darwin in October 1835 noted that the island's population of land iguanas was immense: "I cannot give a more forcible proof of their numbers than by stating that when we were left at James Island we could not for some time find a spot free from their burrows on which to pitch our single tent."[9] On the plants and vegetation, Darwin observed, "As in the other islands, the lower region was covered by nearly leafless bushes, but the trees were here of larger growth than elsewhere. The upper region, being kept damp by the clouds, supports a green and flourishing vegetation."[10]

Restoration[edit]

The Directorate of Galápagos National Park and Island Conservation reintroduced 1,436 Galápagos Land Iguanas (Conolophus subcristatus) to Santiago Island on 4 January 2019 after a 180 year absence. The partners reintroduced the land iguanas in an effort to restore the island's ecological health and to provide the opportunity for this iguana species to thrive. Land iguanas were sourced from North Seymour Island, where they were introduced in the 1930s and have increased to over 5,000 and faced a lack of food availability. Charles Darwin was the second-last person to record land iguanas alive on Santiago Island in 1835, with Abel-Nicolas Bergasse du Petit-Thouars being the last in 1838.[11][12][13][14][15][16] [17]

See also[edit]

References[edit]

  1. ^ "Santiago". Galapagos Conservancy. galapagos.org. Retrieved 6 June 2017.
  2. ^ "Santiago". Galapagos Geology on the Web. Cornell University. Retrieved 28 April 2021.
  3. ^ "Santiago Volcano". Volcano Discovery. Retrieved 14 July 2021.
  4. ^ Swanson, Frederick (1 November 1974). "Geology of Santiago, Rábida, and Pinzón Islands, Galápagos". Geological Society of America Bulletin. 154: 1803–1810. doi:10.1130/0016-7606(1974)85<1803:GOSRAP>2.0.CO;2. Retrieved 14 July 2021.
  5. ^ "Santiago". Smithsonian Institution Museum of Natural History Global Volcanism Program. Retrieved 14 July 2021.
  6. ^ "Types of Volcanos: Splatter and Tuff Cones". Freie Universität Berlin Department of Earth Science. Retrieved 14 July 2021.
  7. ^ "Isla Santiago, Galapagos Islands". NASA Earth Observatory. Retrieved 14 July 2021.
  8. ^ "Santiago Island, Galapagos". Galapagos Insiders. Retrieved 14 July 2021.
  9. ^ "The Voyage of the Beagle". The University of Pennsylvania. Retrieved 14 July 2021.
  10. ^ Hamann, Ole (May 1993). "The Vegetation of Isla Santiago-Past and Present". Noticias de Galapagos. 52: 6–11. Retrieved 14 July 2021.
  11. ^ "Threatened Galápagos Land Iguanas Return to Santiago Island En-Masse After 180-Year Absence". Island Conservation. Retrieved 9 January 2019.
  12. ^ "Galápagos island gets its first iguanas since Darwin after mass-release". The Guardian. Retrieved 9 January 2019.
  13. ^ "Iguanas reintroduced to Galapagos island after 200 years". CNN.com. Retrieved 9 January 2019.
  14. ^ "Iguanas Are Being Reintroduced to a Galapagos Island Two Centuries After They Disappeared". TIME. Retrieved 9 January 2019.
  15. ^ "Iguanas reintroduced to Galapagos island after almost 200 years". The Independent. Retrieved 9 January 2019.
  16. ^ "Iguanas Reintroduced to the Largest Galapagos Island After Nearly 200 Year Absence". Earther. Retrieved 9 January 2019.
  17. ^ "Santiago Island Lava fields and wildlife at Puerto Egas". Retrieved 30 January 2021.

External links[edit]

Media related to Santiago (Galápagos) at Wikimedia Commons