Ilha da Queimada Grande

Ilha da Queimada Grande (Snake Island)
Nickname: Snake Island

Aerial view of Ilha da Queimada Grande
Ilha da Queimada Grande (Snake Island)

Location of Ilha da Queimada Grande in Brazil

Geography
Location Atlantic Ocean
Coordinates 24°29′S 46°41′W / 24.483°S 46.683°W / -24.483; -46.683Coordinates: 24°29′S 46°41′W / 24.483°S 46.683°W / -24.483; -46.683
Area 430,000 m2 (4,600,000 sq ft)
Highest elevation 206 m (676 ft)
Administration
State State of São Paulo
Demographics
Population 0
Additional information
Administered by Chico Mendes Institute for Biodiversity Conservation (ICMBio)


Ilha da Queimada Grande, also known as Snake Island, is an island located off the coast of Brazil. The island is small in size, and has many different types of terrain, ranging from bare rock to rainforest. The island has a temperate climate. The island is the only home of the critically endangered, venomous Bothrops insularis (golden lancehead pit viper), which has a diet of birds. Snake Island is closed to the public in order to protect this snake population.

Geography

Located 18 nautical miles (33 km) off the coast of the state of São Paulo, Brazil, the island is approximately 430,000 square metres (110 acres) in area.[1] The island ranges in elevation from sea level to 206 metres (676 ft) above sea level. The island has a temperate climate that is similar to its neighboring island Nimer.[2]

History

Ilha da Queimada Grande has a variety of vegetation. The island is partly covered in rainforest and partly bare rock and grassy cleared areas, a result of deforestation. The deforestation is the origin of the island's name: the term “Queimada”, in Portuguese, means to slash and burn because when locals attempted to clear land for a banana plantation on the island, they had to clear rainforest using this technique. A lighthouse was constructed in 1909, to steer ships away from the island, operated by a single family. The lighthouse is now automated.[3][4] Due to the number of snakes and toxicity of their venom, the Brazilian Navy took action and closed the island to the public.[5] The only people who are allowed on the island are research teams who receive waivers to collect data.

The golden lancehead (Bothrops insularis) is the species of snake which gives the island its unofficial name. The snakes became trapped on the island when rising sea levels covered up the land that connected it to the mainland. This left the snake to adapt to their environment.[6]

Endangerment

Because there are so many snakes on one island, by some estimates one snake to every square meter of the island, there is competition for resources. The population had an extreme population drop to about 2,100.[7] This might have happened because there was a limited amount of resources and the population leveled out, but in 2015 an estimate by a herpetologist on a Discovery Channel documentary states that the population was now 2,000-4,000 golden lanceheads.[8] The Bothrops insularis may also be at risk from inbreeding, effects of which are evident in the population. Because of the overall low population of the Golden Lancehead, the snake was labeled critically endangered on the IUCN Red List of Threatened Species. It was also placed on the list of the Brazilian endangered animals.

References

  1. ↑ Cox, Savannah (December 17, 2012). "Four Tiny Islands That You'll Never Visit". all-that-is-interesting. PBH network. Retrieved November 4, 2015.
  2. ↑ Marques, Otavio (September 1, 2013). "Reproductive Ecology of the Threatened Pitviper Bothrops insularis from Queimada Grande Island, Southeast Brazil". Journal of Herpetology.
  3. ↑ A. V. Marques, Otavio; Martins, Marcio; Sazima, Ivan (2002). "A jararaca da ilha da Queimada Grande" (PDF). Ciência Hoje (in Portuguese) (Sociedade Brasileira para o Progresso da Ciência.) 31 (2): 56–59. Retrieved 8 August 2015.
  4. ↑ Snake Island Part 1, Vice
  5. ↑ "Snake Island - Ilha da Queimada Grande". AtlasObsura. Atlas Obscura. November 11, 2015. Retrieved October 28, 2015.
  6. ↑ Thomas, Emily (July 4, 2014). "Brazil's 'Snake Island' Is The Place Of Nightmares, We're Pretty Sure". Huff Post Science. TheHuffingtonPost. Retrieved October 24, 2015.
  7. ↑ Marques, Otavio (April 1, 2012). "The golden lancehead Bothrops insularis (Serpentes: Viperidae) relies on two seasonally plentiful bird species visiting its island habitat". Journal of Natural History.
  8. ↑ Channel, Discovery. "Treasure Quest: Snake Island Facts".

External links

This article is issued from Wikipedia - version of the Saturday, May 07, 2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.