Cañón de Santa Elena Flora and Fauna Protection Area

The arrowheads, mortars and paintings found at the site indicate the following human occupation periods: Paleo-Indian (15,000–6,500 BC), Archaic (6500 BC – 900 AD), early Postclassic (900–1500 AD), and late Postclassic (1300–1680). These populations were dispersed with seasonal movements, allowing the use of resources. They engaged in fishing, the collection, hunting, and agriculture. Among the groups transiting this area were the Conchos, the Jumano, the Chisos and Apaches, the Chiricahua, the Mescaleros and Lipanes.[3]

The Spanish and Comanche arrived at the same time, and ended with the Mescalero and Lipan. The colonial government established the Rio Grande as a line of defense, where he built small fortifications, which were guarded by a garrison of soldiers. These were San Carlos, in Chihuahua, and the Board of Rivers, San Vicente, Santa Rosa and San Juan Bautista, in Coahuila. Until 1890 the region remained virtually uninhabited due to attacks by Apaches and Comanche tribes.[3]

From 1784, the fort of San Carlos was abandoned and was only used by travelers, who were protected from attack by Apaches and bandits. The first council of municipality of Ojinaga was built in 1824, and was annexed in 1831, as a section of San Carlos, which bears the name of Manuel Benavides.

Map of the Chihuahuan Desert, as a satellite image from NASA, with the border between the US and Mexico shown in black. The area is protected by several reserves in both countries.

The protected area is in the Chihuahuan desert ecoregion. It includes a number of mountain ranges separated by valleys and undulating plains. It has great diversity of vegetation types because of the large differences in altitude, from 700 to 2,400 m (2,300 to 7,900 ft) above sea level.[1]

Climate

The Rio Grande, which separates US of Mexico, through the Santa Elena Canyon.

The area has an extremely dry and hot climate.[5] The climatic conditions are very extreme, with temperatures up to 50 °C (122 °F) in summer.[1] In addition, there is a contrast between the desert and cold temperate ecosystems. The climate is arid, with little rain in summer.[6]

The Rio Grande running through Santa Elena Canyon.

In the area, there are several species, of which 79 are protected. Thirteen of these are species of plants, mostly cacti, while the rest are 66 species of wildlife, among which include the black bear, the golden eagle, the peregrine falcon and beaver.[6]

The area has a great diversity of vegetation, highlighting the scrub desert microphyll, scrub desert rosetophilous, the pasture, the oak forest and vegetation riparian, and also scrub Guamis, mariola, cenixo and guayacán in addition to mesquite, feline and huizaches. In the region with a resetófila vegetation, which is made up of lechuguilla, sotol and various species of cactus develops. Moreover, there is riparian vegetation consisting of poplars and willows.[2][note 1]

In the desert scrub microphyll, various species such as Guamis (Larrea tridentata), hojasén (Flourensia cernua), mariola (Parthenium incanum), mesquite (Prosopis glandulosa), ocotillo (Founquieria splendens) and reed (Koeberlinia spinosa), among others may be found. In the desert scrub rosetophilous, you can find species such as palm (Yucca rostrata), lechuguilla (Agave lechugilla), maguey (Agave spp), among others. In the grasslands, there are species such as penknives (Bouteloua gracilis) or the Chinese grass (Hilaria belangeri), among others.[2] This table groups vegetation protection area are based on its altitude and its botanical composition.

The fauna of the region is composed by birds and mammals that have adapted to aridity. Among the species that inhabit the area are the black-tailed jackrabbit, the bobcat (Lynx rufus), the whitetail deer (Odocoileus virginianus), the mule deer, the collared peccary (Tayassu tajacu), mourning doves, some ducks and coyotes.[6] There are also birds of prey like peregrine falcon (Falcao peregrinus), the kestrel (Falco sparverius) and the golden eagle (Aquila chrysaetos). In addition, the presence of songbirds and ornamental birds stands out, and several species of fish.[1]

In 1990, at the request of the Government of the State of Chihuahua, the process for creating a Biosphere Reserve in Northwest state of Chihuahua was initiated, bordering with the Big Bend National Park in United States. After some meetings with villagers and local authorities, the region was declared a Protected Area of Flora and Fauna in 1994.[9] This protected area was included within the area of the Forest Protected Area, and declared in 1934, with the aim of conserving irrigation watersheds, protecting the flow of the Amistad Reservoir in Coahuila.[7]

The Federal government of the United States had pushed, since 1934, for the creation of a protected area in Mexico to be the counterpart of Big Bend National Park. These initiatives were not considered for various reasons until 1994, except for the creation of the Department of Forest Protection enacted in 1934.[7]

The Rio Grande, as it emerges from the Santa Elena Canyon. The left wall of the canyon is in Mexico and the right is in the US.

The protected area is affected by various threats, all being caused by humans. These may be environmental, due to the excesses committed by the settlers on the resources of pasture, with an overload of ranching and cattle. Also, some people are clearing land for new crops, thus losing native plant species. Another threat is the mining exploitation, using materials extracted for works and services. There is also the plant smuggling, especially cactus, fossils and other archaeological artifacts used by the ancient inhabitants of the area. A looming threat is unchecked tourism, which can inadvertently damage parts of the reserve.[7]

This reserve was created with the aim of having a protected area that represented the ecological area known as Chihuahuan desert, where counterpart of protected areas border of Texas, being able to extend the protection of ecosystems and conducting joint actions in ecological matters.[4] A study of Autonomous University of Chihuahua conducted in 1994 also argues that the region should be protected because it has a considerable amount of endangered species (13 species of flora and 66 of fauna) and a large geological, hydrological and historical heritage, and a striking contrast between the ecosystems of desert and forest.[10]

• Mexico–United States international park

• "Management Program Area of Protection of Flora and Fauna Santa Elena Canyon, Mexico" (PDF) (in Spanish). Mexico, DF: National Institute of Ecology. July 1997. Retrieved 11 September 2009.

• Map -Protection Area of Flora and Fauna Santa Elena Canyon, Chihuahua