Lake Enriquillo

Lake Enriquillo

Viewed from space, northeast to southwest, September 1993
Coordinates 18°30′N 71°35′W / 18.500°N 71.583°W / 18.500; -71.583Coordinates: 18°30′N 71°35′W / 18.500°N 71.583°W / 18.500; -71.583
Type saline lake
Primary inflows Yaque del Sur
Primary outflows evaporation
Basin countries Dominican Republic
Surface area 375 km2 (145 sq mi)[1]
Max. depth 52 m (171 ft)
Surface elevation −27 m (−89 ft)
Islands Isla Cabritos (Two former islands submerged by December 2011)[2]
Settlements Boca de Cachón, La Descubierta, Postrer Río, Neyba, Duvergé, Jimaní

Lake Enriquillo (Spanish: Lago Enriquillo) is a hypersaline lake in the Dominican Republic located in the southwestern region of the country. Its waters are shared between the provinces of Bahoruco and Independencia, the latter of which borders Haiti. Lake Enriquillo is the largest lake[3] and the lowest elevation in the Caribbean.

Hydrology

Lake Enriquillo seen from Las Caritas National Park, near La Descubierta

Lake Enriquillo covers an area of 145 mi2 (375 km2),[1] and is the lowest point in the Caribbean, falling 148 feet (45 m) below sea level.[4] Its drainage basin includes 10 minor river systems. The rivers that rise in the Neiba Mountains to the north (lower center and lower right of the image) are perennial. Those rivers that rise in the Baoruco Mountains to the south are intermittent. Lake Enriquillo has no outlet. The lake's water level varies because of a combination of storm-driven precipitation events and the region's high evaporation rate. Salinity in the lake can vary between 33 parts per thousand (comparable to seawater) and over 100 parts per thousand (hypersaline).

The region has a hot, semiarid climate. Annual rainfall is not evenly distributed, with peak precipitation occurring in May and October. The dry season is December through April when rainfall may be less than 20 mm (0.79 in). Due to the length of the lake, annual rainfall averages also vary at the eastern and western ends: 729 mm (28.7 in) on the northwest shore, and 508 mm (20.0 in) in the southeast.[3]

Flooding trend

Between 2004 and 2009, the lake doubled its surface area. Records for 2004 show the lake to be 164 square kilometres (63 sq mi); measurements from 2011 put the area at 350 km2 (140 sq mi).[5][lower-alpha 1]

Reasons for the flooding are being debated, but may be a combination of several, including increases in rainfall in the region in recent years, increase of sediments going into the lake from run-off due to deforestation that are contributing to raising the lakebed, and milder temperatures, which are reducing the surface evaporation rate.[5]

Geology

Lake Enriquillo is located in a rift valley formed by the Enriquillo-Plantain Garden fault that extends 79 miles (127 km) from Port-au-Prince Bay in Haiti in the west, to near Neiba Bay in the Dominican Republic in the east.[lower-alpha 2] Known as the Hoya de Enriquillo in the Dominican Republic (and as the Plain du Cul-de-Sac in Haiti), parts of the rift valley are below sea level and are covered by large salt lakes. The rift valley, a former marine strait, was created around one million years ago when the water level fell and the strait was filled in by sediments of the Yaque del Sur River.[7] Tremors in the region are common.

There are three islands in the lake: Barbarita, Islita, and Isla Cabritos. Once, when water levels dropped during dry spells, the islands were linked to one another by sandbars. As of December 2011, only Isla Cabritos remains, the other two islands submerged by the rising volume of the lake.[2]

Ecology

Lake Enriquillo is home to the largest population of American crocodiles (Crocodylus acutus) in the Caribbean.[7] Three species of fish inhabit the lake: the blackbanded limia (Limia melanonotata), the Hispaniolan gambusia (Gambusia hispaniolae), and the Hispaniola pupfish (Cyprinodon bondi).[8] Two rare iguanas endemic to Hispaniola live sympatrically on Isla Cabritos, the critically endangered Ricord's iguana (Cyclura ricordi) and the threatened rhinoceros iguana (Cyclura cornuta).[9] Among the numerous bird species found at the lake, American flamingos (Phoenicopterus ruber) are prominent;[10] flocks of flamingos are especially concentrated on Isla Cabritos and near the eastern end of the lake.[11]

Plants that thrive in arid places, such as cacti, can be found here.

A national park was established in 1974 to preserve the area; in 2002 it was combined with two other parks to form the Jaragua-Bahoruco-Enriquillo Biosphere Reserve.[12]

History

South shore of Lake Enriquillo, looking northward to the Sierra de Neiba mountains; Independencia Province, Dominican Republic

The lake is named after Enriquillo, a cacique of the indigenous Taíno, who rebelled against the Spaniards in the early 16th century, and hid in the mountains south of the lake.[13] It was previously called Lake Xaragua, after the Taino chiefdom in which it was located.

Economy

Land near Lake Enriquillo has long been used for agriculture, such as banana, sweet potato and yuca farms, and pasture for cattle. The rising water levels have affected hundreds of nearby residents in townships bordering the lake, with abundant loss of agricultural land.[5][14][lower-alpha 3]

Important towns near the shores of Enriquillo include Neiba, the capital of Baoruco Province, on the northeast, and Jimaní, the capital of Independencia Province, at the western end of the lake near the border with Haiti. La Descubierta is the town nearest to the entrance of Lago Enriquillo e Isla Cabritos National Park.[7] The community of Boca de Cachon, near the lake and severely affected by the rising waters, has been the subject of government relocation efforts including the construction of a new town further from the shores of Enriquillo.[14]

Notes

  1. ↑ In 2003 the lake was at its lowest level in more than 20 years.[6]
  2. ↑ This fault was responsible for the catastrophic 2010 Haiti earthquake.
  3. ↑ A 2014 article cites a government estimate of 40,000 acres (16,000 ha) of agricultural land lost.[14]

References

  1. 1 2 "UE otorga 200.000 euros a afectados por la crecida Lago Enriquillo" [EU gives €200,000 to people affected by the flooding of Lake Enriquillo]. Listín Diario (in Spanish). Agencia EFE. 20 October 2011. Retrieved 19 July 2012. ... según el Instituto Nacional de Recursos Hidráulicos (INDHRI), su superficie ha alcanzado 37.500 hectáreas. [... according to the National Institute of Water Resources (INDHRI), the area has reached 37,500 hectares.]
  2. 1 2 Peguero, Adriana (8 December 2011). "Lago Enriquillo amenaza casas de sus alrededores" [Homes around Lake Enriquillo threatened]. Listín Diario (in Spanish). Retrieved 21 December 2011. ... investigador Jorge E. Rodríguez resaltó que han encontrado que el lago Enriquillo ha aumentado en 100%, duplicando su tamaño desde el año 1984, ya que registra una superficie de 350 kilómetros cuadrados, frente a 172 kilómetros cuadrados. [... researcher Jorge E. Rodriguez stressed that he found Lake Enriquillo has increased by 100%, doubling in size since 1984 as it records an area of 350 square kilometers, compared to 172 square kilometers.]
  3. 1 2 Buck, David G.; Brenner, Mark; Hodell, David A.; Curtis, Jason H.; et al. (2005). "Physical and chemical properties of hypersaline Lago Enriquillo, Dominican Republic" (PDF). Internationale Vereinigung fur Theoretische und Angewandte Limnologie Verhandlungen. 29 (2): 725–731. Retrieved 18 February 2015.
  4. ↑ Romero Luna, Eva Joelisa; Poteau, Dina (August 2011). Water Level Fluctuations of Lake Enriquillo and Lake Saumatre in Response to Environmental Changes (PDF) (Thesis). Cornell University. Retrieved 4 December 2012.
  5. 1 2 3 Ramírez Mac-Lean, Mariana (16 January 2012). "La vida después del agua" [Life after water]. Diario Libre (in Spanish). Retrieved 18 February 2015.
  6. ↑ Steenhuis, T.S.; Hrnčíř, M.; Poteau, D.; Romero Luna, E.J.; et al. (2013). "A Saturated Excess Runoff Pedotransfer Function for Vegetated Watersheds" (PDF). Vadose Zone Journal. 12 (4). doi:10.2136/vzj2013.03.0060.
  7. 1 2 3 Baker, Christopher P. (2008). National Geographic Traveler: Dominican Republic. National Geographic Society. pp. 44; 189–191. ISBN 978-1-4262-0232-2.
  8. ↑ Haney, Dennis C.; Walsh, Stephen J. (2003). "Influence of Salinity and Temperature on the Physiology of Limia melanonotata (Cyprinodontiformes: Poeciliidae): A Search for Abiotic Factors Limiting Insular Distribution in Hispaniola" (PDF). Caribbean Journal of Science. 39 (3): 327–337.
  9. ↑ Lemm, Jeffrey; Alberts, Allison C. (2011). Cyclura: Natural History, Husbandry, and Conservation of West Indian Rock Iguanas. Academic Press. pp. 60–61. ISBN 978-1-4377-3517-8.
  10. ↑ Wauer, Roland H. (2010). A Birder's West Indies: An Island-by-Island Tour. University of Texas Press. p. 57. ISBN 978-0-292-78672-1.
  11. ↑ Paulino, M. M.; Mejia, D. A.; Latta, S. C. (2013). "A new review of the status of the Caribbean Flamingo Phoenicopterus ruber in the Dominican Republic and Haiti" (PDF). Grupo Para la Conservacion del Flamenco del Caribe. Retrieved 19 February 2015.
  12. ↑ "Jaragua-Bahoruco-Enriquillo Biosphere Reserve". Grupo Jaragua. 6 July 2006. Retrieved 2015-02-21.
  13. ↑ Harvey, Sean (2009). The Rough Guide to the Dominican Republic. Rough Guides Limited. p. 307. ISBN 978-1-85828-811-6.
  14. 1 2 3 Archibold, Randal C. (11 January 2014). "Rising Tide Is a Mystery That Sinks Island Hopes". New York Times. Retrieved 19 February 2015.
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