Island off the coast of Brazil
Ilha da Queimada Grande
, more commonly referred to as
Snake Island
, is an island off the coast of Brazil in the
Atlantic Ocean
. The island became famous for its abundant snakes, hence the name "Snake Island". It is administered as part of the municipality of
Itanhaem
in the
State of Sao Paulo
. The island is small, with an area of only 43 hectares (106 acres), and has a temperate climate. Its terrain varies from bare rock to rainforest.
The island is the only natural home of the
critically endangered
, venomous
Bothrops insularis
(golden lancehead
pit viper
), which has a diet of birds. The snakes became trapped on the island thousands of years ago following the end of the
last ice age
when rising ocean levels disconnected the island from the mainland. The ensuing
evolutionary pressure
allowed the snakes to adapt to their new environment, increasing rapidly in population and rendering the island dangerous to public visitation.
Queimada Grande is closed to the public for the protection of both people and snakes; access is available only to the
Brazilian Navy
and selected researchers vetted by the
Chico Mendes Institute for Biodiversity Conservation
, the Brazilian federal conservation unit.
[1]
[2]
[3]
Geography
[
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]
Located approximately 33 kilometres (21 mi) off the coast of the state of Sao Paulo, Brazil, the island is approximately 430,000 square metres (106 acres) in area, and ranges in elevation from 0 to 206 metres (676 ft) above sea level. It has a temperate climate that is similar to that of its neighbouring island
Nimer
. Rain forest covers 0.25 square kilometres (62 acres) of the island, with the remaining area consisting of barren rocks and open grassland. Queimada Grande ranges from an average of 18.38 °C (65.08 °F) in August to 27.28 °C (81.10 °F) in March, and rainfall ranges from 0.2 millimetres (0.0079 in) per month in July to 135.2 millimetres (5.32 in) in December.
[1]
[4]
and there are different types of birds that are the diet of the snakes living there.
History
[
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]
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
is Portuguese for
forest fire
: locals attempted to clear land for a
banana plantation
on the island by burning. A
lighthouse
was constructed in 1909 to steer ships away from the island. The last human inhabitants left the island when the lighthouse was automated.
[5]
[6]
[7]
The island and the Ilha Queimada Pequena to the west are protected by the 33 hectares (82 acres)
Ilhas Queimada Pequena e Queimada Grande Area of Relevant Ecological Interest
, created in 1985.
[8]
The
Brazilian Navy
has closed the island to the public to protect human and snake life. The only people who are allowed on the island are research teams who receive waivers to collect data.
[9]
[
better source needed
]
Endangered species
[
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]
Because there are so many snakes on one island ? by some estimates one snake per square meter (10.8 square feet) ? there is competition for resources. However, several sources have debunked this claim and stated it is simply impossible to support such a large population with so few resources.
[
citation needed
]
Despite a population of 41 recorded bird species on Queimada Grande, the golden lancehead (
Bothrops insularis
) relies on only two: the
Troglodytes musculus
(southern
house wren
), which is usually able to avoid the golden lancehead as a predator; and the
Chilean elaenia
(a species of
flycatcher
), which feeds on vegetation in the same area as the snake.
The island was previously thought to have a population of about 430,000 snakes, but recent estimates are much lower. The first systematic study of the population of the golden lancehead found the number to be 2,000 to 4,000, concentrated almost entirely in the rainforest area of the island.
[10]
[11]
This might have happened because there was a limited amount of resources and the population became level, but in 2015 an estimate by a
herpetologist
on a
Discovery Channel
documentary stated that the population remains at 2,000 to 4,000 golden lanceheads.
[5]
The golden lancehead also may be at risk from inbreeding, effects of which are evident in the population.
[
citation needed
]
Because of the overall low population of the golden lancehead, the snake was labelled critically endangered on the
IUCN
Red List of Threatened Species. It also was placed on the list of Brazil's endangered animals. The island is also home to a smaller population of
Dipsas albifrons
, a non-venomous snake species.
[1]
[11]
See also
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]
References
[
edit
]
- ^
a
b
c
Marques, Otavio A. V.; Kasperoviczus, Karina; Almeida-Santos, Selma M. (2013). "Reproductive Ecology of the Threatened Pitviper
Bothrops insularis
from Queimada Grande Island, Southeast Brazil".
Journal of Herpetology
.
47
(3): 393?399.
doi
:
10.1670/11-267
.
S2CID
86639586
.
- ^
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
.
- ^
"Exposicao traz historia da ilha que abriga unica especie de cobra no mundo"
(DOC)
(in Portuguese). Secretaria De Comunicacao Social, Prefeitura Municipal De Itanhaem. 2007
. Retrieved
2016-09-20
.
- ^
Cox, Savannah (December 17, 2012).
"Four Tiny Islands That You'll Never Visit"
.
all-that-is-interesting
. PBH network
. Retrieved
November 4,
2015
.
- ^
a
b
Channel, Discovery.
"Treasure Quest: Snake Island Facts"
.
- ^
Marques, Otavio, A. V.; Martins, Marcio; Sazima, Ivan (2002).
"A jararaca da ilha da Queimada Grande"
(PDF)
.
Ciencia Hoje
(in Portuguese).
31
(2). Sociedade Brasileira para o Progresso da Ciencia.: 56?59
. Retrieved
8 August
2015
.
{{
cite journal
}}
: CS1 maint: multiple names: authors list (
link
)
- ^
Snake Island Part 1
, Vice
- ^
ARIE das Ilhas Queimada Pequena e Queimada Grande
(in Portuguese), ISA: Instituto Socioambiental
, retrieved
2016-11-20
- ^
"Snake Island (Ilha da Queimada Grande)"
.
Atlas Obscura
. August 15, 2023 [original publication date July 21, 2016].
- ^
Martins, Marcio; Sawaya, Ricardo J.; Marques, Otavio A. V. (2008). "A First Estimate of the Population Size of the Critically Endangered Lancehead,
Bothrops insularis
".
South American Journal of Herpetology
.
3
(2): 168?174.
doi
:
10.2994/1808-9798(2008)3[168:AFEOTP]2.0.CO;2
.
S2CID
84336530
.
- ^
a
b
Marques, Otavio A. V.; Martins, Marcio; Develey, Pedro F.; Macarrao, Arthur; Sazima, Ivan (2012). "The golden lancehead
Bothrops insularis
(Serpentes: Viperidae) relies on two seasonally plentiful bird species visiting its island habitat".
Journal of Natural History
.
46
(13?14): 885?895.
doi
:
10.1080/00222933.2011.654278
.
S2CID
53357655
.
External links
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]