Western Gulf coastal grasslands

Western Gulf coastal grasslands
Ecology
Ecozone	Nearctic
Biome	Tropical and subtropical grasslands, savannas, and shrublands
Bird species	335
Mammal species	75
Geography
Area	77,425 km2 (29,894 sq mi)
Countries	United States and Mexico
States	Texas, Louisiana, Mississippi, Alabama, Florida and Tamaulipas
Conservation
Habitat loss	48.734%
Protected	10.31%

The Western Gulf coastal grasslands are a subtropical grassland ecoregion of the southern United States and northeastern Mexico. It is known in Texas as "Coastal Prairie" and as the Tamaulipan pastizal in Mexico.

Setting

The ecoregion covers an area of 77,425 km² (29,894 sq mi), extending along the shore of the Gulf of Mexico from southeastern Louisiana (west of the Mississippi Delta) through Texas and into the Mexican state of Tamaulipas as far as the Laguna Madre. Specific areas include a number of barrier islands, and the resacas or natural levees of the Laguna Madre. The coast is vulneable to tropical storms that can seriously damage habitats.

Flora

The natural habitat of the area is a mix of tallgrass prairie similar to those found in inland Texas, with Indiangrass (Sorghastrum nutans), big bluestem (Andropogon gerardi), little bluestem (Schizachyrium scoparium), and switchgrass (Panicum virgatum) the primary tallgrass species that are typical of the coastal prairie, with several other shorter grasses and many herbaceous and woody species. The southern third of the Texas stretch and all of the Tamaulipan portion contains shrubby areas of honey mesquite (Prosopis glandulosa), huisache (Vachellia farnesiana var. farnesiana), lime prickly-ash (Zanthoxylum fagara), and Texas persimmon (Diospyros texana).

Fauna

This coast is rich in wildlife, and 700 species of birds, animals and reptiles have been counted here, although many are now threatened or endangered. This coast is a critical habitat for the Attwater's prairie chickens (Tympanuchus cupido attwateri), over one million of which inhabited the prairie in Texas and Louisiana in the 19th century, but extreme reduction of their habitat put them on the U.S. endangered species list in 1967. Another endangered bird of the coast is the whooping crane (Grus americana) while other birds include least grebe, white-collared seedeater (Sporophila morelleti), red-billed pigeon (Columba flavirostris), brown jay (Cyanocorax morio), Neotropic cormorant, white-winged dove (Leptotila verrequxi) and Audubon's oriole (Icterus graduacauda).

Mammals of the area include ocelot (Leopardus pardalis), Gulf Coast jaguarundi (Puma yagouaroundi cacomitli), southern yellow bat (Lasiurus ega), Mexican spiny pocket mouse (Liomys irroratus), bobcats, collared peccary and eastern cottontails. Rancho Nuevo beach in Tamaulipas and along the Texas coast are the only two nesting sites in the world for the Kemp's ridley sea turtle (Lepidochelys kempii) while other herpetofauna of the ecoregion include Río Grande chirping frog (Eleutherodactylus cystignathoides) and Mexican white-lipped frog (Leptodactylus fragilis).

Threats and preservation

Less than 1% of the ecoregion remains in pristine condition, almost entirely in Texas, while most of the coast has been converted to farmland, including rice paddies, grazing land, or urban areas including Houston, Texas. Estuaries and other coastal wetlands are better preserved than the prairie and indeed the protected areas of the coast are mainly sanctuaries for waterbirds.

See also

• List of ecoregions in Mexico
• List of ecoregions in the United States (WWF)