Yucatán dry forests

Yucatán dry forests
Mayan ruins at Uxmal, Yucatan
Location of the Yucatán dry forests ecoregion
Ecology
RealmNeotropical
Biometropical and subtropical dry broadleaf forests
Borders
Geography
Area49,583 km2 (19,144 sq mi)
CountryMexico
States
Conservation
Conservation statusRelatively stable/intact
Protected1,723 km2 (3%)[1]

The Yucatán dry forests is a tropical dry broadleaf forest ecoregion in southern Mexico. It includes the dry forests of the northwestern Yucatán Peninsula.

Geography

The Yucatán dry forests occupy the northwestern portion of the Yucatán Peninsula. They cover most of the state of Yucatán, the northern portion of Campeche, and small areas of northwestern Quintana Roo. It is bounded on the east and south by the Yucatán moist forests ecoregion. The Gulf of Mexico lies to the north and west, and the coast is fringed with mangroves.

The region is mostly flat, lying below 400 meters elevation. The underlying rocks are porous limestone and coral, and the region has extensive underground drainage, including caverns and sinkholes, with few surface streams or rivers.[2]

The cities of Mérida and Campeche are located in the ecoregion.

Climate

The climate of the ecoregion is tropical and subhumid. Rainfall is less than 1200 mm per year, with a long dry season.[2]

Flora

The predominant vegetation is open-canopied dry forest and thorn scrub. Most trees and shrubs are deciduous, losing their leaves during the long dry season. Cacti are common, particularly nearer the coast. Grassy and herbaceous understory plants are generally sparse.[2]

In the drier central portion of the ecoregion, tsalam (Lysiloma bahamensis) and jabín (Piscidia piscipula) are the predominant trees, with Alvaradoa amorphoides, Bursera simaruba, Cedrela mexicana, Chlorophora tinctoria, Cordia gerascanthus, and Lonchocarpus rugosus. Elsewhere Vitex gaumeri, Brosimum alicastrum, Caesalpinia gaumeri, Cedrela odorata, Ceiba pentandra, and Sideroxylon foetidissimum are common.[2]

Along the northern coast tall columnar cacti are abundant. Common species include Cephalocereus gaumeri, Pterocereus gaumeri, and Lemaireocereus griseus.[2]

About 10% of plants are endemic to the ecoregion. The tropical moist forests to the south isolate the Yucatán dry forests from other dry forest ecoregions in Mexico and Central America.[2]

Fauna

Approximately 96 mammal species are native to the ecoregion. These include the jaguar (Panthera onca), white-nosed coati (Nasua narica), black-handed spider monkey (Ateles geoffroyi), and southern opossum (Didelphis marsupialis).[2]

Over 290 bird species inhabit the ecoregion, with two endemic species. Resident birds include white-fronted amazon (Amazona albifrons) and lesser yellow-headed vulture (Cathartes burrovianus).[2]

Native reptiles include the Mexican beaded lizard (Heloderma horridum).

Conservation and protected areas

Extensive areas of dry forest have been cleared for cattle ranching and for agriculture, including henequén plantations.[2] A 2017 assessment found that only 278 km2, or 3%, of the ecoregion is in protected areas.[1] Protected areas include Ría Lagartos Biosphere Reserve, Los Petenes Biosphere Reserve, Anillo de Cenotes State Reserve, Dzilam State Reserve, and Puuc Biocultural State Reserve.

See also

  • "Yucatán dry forests". Terrestrial Ecoregions. World Wildlife Fund.

References

  1. ^ a b Dinerstein, Eric; Olson, David; et al. (2017). "An Ecoregion-Based Approach to Protecting Half the Terrestrial Realm". BioScience. 67 (6): 534–545, Supplemental material 2 table S1b. doi:10.1093/biosci/bix014. PMC 5451287. PMID 28608869.
  2. ^ a b c d e f g h i "Yucatán dry forests". Terrestrial Ecoregions. World Wildlife Fund.

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