Tehuantepec jackrabbit

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Tehuantepec Jackrabbit[1]
Conservation status
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Lagomorpha
Family: Leporidae
Genus: Lepus
Species: L. flavigularis
Binomial name
Lepus flavigularis
Wagner, 1844
Tehuantepec Jackrabbit range

The Tehuantepec Jackrabbit (Lepus flavigularis) is easily distinguished from other species of jackrabbits by two black stripes that run from the base of the ears to the nape, and by its white flanks.[3] Underparts are white, upperparts are bright-brown washed with black, rump is gray, and the tail is black. This leporid is one of the largest jackrabbits and has large ears and legs. Adults weigh about 3500 to 4000 grams.

Distribution

The Tehuantepec Jackrabbit is a rare endemic of Oaxaca, México, and is only found along savannas and grassy dunes on the shores of a salt water lagoon connected to the Gulf of Tehuantepec. Three small populations persist isolated from each other.

The former distribution of the Tehuantepec Jackrabbit is not documented in detail, but it is estimated that the leporid's historic geographic range along the Mexican Pacific Coast on the Isthmus of Tehuantepec from Salina Cruz in Oaxaca to Tonalá in Chiapas, an area of perhaps only 5000 km sq.[4]

Habitat and Ecology

Tropical dry savannas dominated by native grasses (Bouteloua, Paspalum) with an overstory of sparse bushes of nanche (Byrsonima crassifolia), and scattered trees of morro (Crescentia) are selected by the Tehuantepec Jackrabbit.[5] The Tehuantepec Jackrabbit is also found in coastal grassy dunes with Opuntia decumbens, Opuntia tehuantepecana, and Sabal mexicana.[6]

Home ranges overlap with one or more individuals regardless of sex and age, and home range size is about 50 ha with core areas of 9 ha for adult jackrabbits.[5] The Tehuantepec Jackrabbit is nocturnal and crepuscular, and during the diurnal hours it rests in forms under bushes or grasses.

Native mammals that coexist with the Tehuantepec Jackrabbit are the Eastern Cottontail (Sylvilagus floridanus), the Nine-banded Armadillo (Dasypus novemcinctus), the Hooded and Western Hog-nosed Skunks (Mephitis macroura, Conepatus mesoleucus), the Virginia Opossum (Didelphis marsupialis), the Gray Mouse Opossum (Tlacuatzin canescens), the Gray Fox (Urocyon cinereoargenteus), the Common Raccoon (Procyon lotor), and the Coyote (Canis latrans).[7] Of these, the Gray Fox and the Coyote are native predators of the Tehuantepec Jackrabbit.

Reproduction

The length of the breeding season may extend from February to December, with a peak in reproduction during the rainy season (from May to October). Litter size is one to four embryos,[8] but the number of litters produced per female per year remains to be investigated.

Conservation

The Tehuantepec Jackrabbit is listed as critically endangered in the Mexican Official Norm NOM-059-ECOL-2001, and as an endangered species by the International Union for the Conservation of Nature (IUCN) Red List of Endangered Species.

Threats

The Tehuantepec Jackrabbit is jeopardized by habitat loss and fragmentation, poaching, small population size, and genetic isolation. Introduction of exotic grasses, frequent and induced fires, agricultural and cattle-raising activities, and human settlements are deteriorating the floristic diversity and native vegetation structure in savannas inhabited by Tehuantepec jackrabbits.[5][9] Locally, the Tehuantepec Jackrabbit is taken occasionally as subsistence hunting, and very occasionally as pets in rural communities. Predation by the Gray Fox and the Coyote is the major cause of mortality of the Tehuantepec Jackrabbit.[5] However, poachers may come from nearby cities and decimate populations in a few nights of hunting.

References

  1. ↑ Hoffman, R. S.; Smith, A. T. (2005). "Order Lagomorpha". In Wilson, D. E.; Reeder, D. M. Mammal Species of the World (3rd ed.). Johns Hopkins University Press. p. 199. ISBN 978-0-8018-8221-0. OCLC 62265494. 
  2. ↑ Cervantes, F. A., Lorenzo, C., Farías, V. & Vargas, J. (2008). "Lepus flavigularis". IUCN Red List of Threatened Species. Version 2010.4. International Union for Conservation of Nature. Retrieved 24 Feb. 2011. 
  3. ↑ Flux, J. E. C., and R. Angermann (1990). "The hares and jackrabbits". In Chapman, J. A. and J. E. C. Flux, eds. Rabbits, hares, and pikas. Status survey and conservation action plan. Gland, Switzerland: International Union for Conservation of Nature and Natural Resources. pp. 61–94. 
  4. ↑ Nelson, E. W. (1909). "The rabbits of North America". North American Fauna 29: 9–287. 
  5. ↑ 5.0 5.1 5.2 5.3 Farías, V. 2004. Spatio-temporal ecology and habitat selection of the critically endangered tropical hare (Lepus flavigularis) in Oaxaca, Mexico. Ph.D. Dissertation. University of Massachusetts, Amherst.
  6. ↑ Vargas, J. (2000). "Distribución, abundancia y hábitat de la liebre endémica Lepus flavigularis (Mammalia: Lagomorpha)". Tesis de Maestría en Biología Animal, Facultad de Ciencias, Universidad Nacional Autónoma de México. México, D. F., México. 
  7. ↑ Cervantes, F. A., and L. Yépez (1995). "Species richness of mammals from the vicinity of Salina Cruz, coastal Oaxaca, Mexico". Anales del Instituto de Biología Universidad Nacional Autónoma de México, Serie Zoología 66: 113–122. 
  8. ↑ Cervantes, F. A. (1993). "Lepus flavigularis". Mammalian Species (American Society of Mammalogists) 423 (423): 1–3. doi:10.2307/3504288. JSTOR 3504288. 
  9. ↑ Pérez-García, E. A., J. Meave, and C. Gallardo (2001). "Vegetación y Flora de la Región de Nizanda, Istmo de Tehuatnepec, Oaxaca, México". Acta Botánica Mexicana 56: 19–88. 
  • Cervantes, F. A., and C. Lorenzo. 1997. Morphometric differentiation of rabbits (Sylvilagus and Romerolagus) and jackrabbits (Lepus) of Mexico. Gibier Faune Sauvage 14:405-425.
  • Sántis, E. C. 2002. Distribución y abundancia de la liebre endémica Lepus flavigularis y el conejo castellano Sylvilagus floridanus (Mammalia: Lagomorpha) en el Istmo de Tehuantepec, Oaxaca, México. Tesis de Licenciado en Biología. Universidad de Ciencias y Artes de Chiapas. Tuxtla Gutierrez, Chiapas, México.
  • Vargas, Z. 2001. Valoración de los vertebrados terrestres por los huaves y zapotecas de la zona lagunar del Istmo de Tehuantepec, Oaxaca. Tesis de Maestría. El Colegio de la Frontera Sur. Chiapas, México.
  • Villa, B., and F. A. Cervantes. 2003. Los mamíferos de México. Iberoamericana. Instituto de Biología, Universidad Nacional Autónoma de México. México, D. F. 140 pp. and CD-rom.
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