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VARIACIÓN DE CRYPTOTIS AROENSIS EN VENEZUELA Woodman, N., y R. M. Timm. 1993. Intraspecific and interspecific variation in the Cryptotis nigrescens species complex of small-eared shrews (Insectivora: Soricidae), with the description of a new species from Colombia. Fieldiana Zoology 1452:1-30. Woodman, N., y R. M. Timm. 1999. Geographic variation and evolutionary relationships among broad-clawed shrew of the Cryptotis goldmani-group (Mammalia: Insectivora: Soricidae). Fieldiana Zoology 91:1-35. Wooman, N., C. A. Cuartas-Calle, y C. A. Delgado-V. 2003. The humerus of Cryptotis colombiana and its bearing on the species’ phylogenetic relationships (Soricomorpha: Soricidae). Journal of Mammalogy 84:832-839. Sometido: 29 de marzo de 2014 Revisado: 15 de junio de 2014 Aceptado: 26 de junio de 2014 Editor asociado: Sergio Solari Diseño gráfico editorial: Gerardo Hernández Apéndice Especímenes examinados: Cryptotis aroensis: La Trampa del Tigre (10° 24’ 11” N -68° 48’ 01” O; 1,400-1,940 m), Sector El Silencio Parque Nacional Yurubí, Sierra de Aroa, Yaracuy (EBRG-29383 al 29389; MZUC-1010 al 1038). Cryptotis meridensis: Mérida, Monte Zerpa, 6 Km N, Mérida, 2,162 m (MZUC-853 al 862). 600 THERYA Vol.5(2): 589-600
Habitat characteristics of antillean Manatee (Trichechus manatus manatus) in fluvial lake systems of southern Gulf of México THERYA, agosto, 2014 Vol.5(2): 601-614 DOI: 10.12933/<strong>therya</strong>-14-205 Características del hábitat del Manatí antillano (Trichechus manatus manatus) en sistemas fluviolagunares del sur del Golfo de México Darwin Jiménez-Domínguez 1 y León David Olivera-Gómez 1 * Introduction: Studying a species habitat is a tool for researchers and stake holders to find key ecological characteristics to be used in management actions. Freshwater systems comprises most of the habitat of Antillean manatees, however the habitat features of these systems are still poorly understood. The objective of this study was to explore habitat variables related most to the use of freshwater systems by the Antillean manatees on the low basin of Usumacinta river. Methods: We built generalized linear models using data on presence/absence and from sightings, achieved by direct and indirect sources on 62 navigations, between March 2006 and November 2007. For the models we used four types of variables: biological, physical, anthropic and from landscape, all previously reported as important in the habitat use of Antillean manatee. Results: In general, the area (Fig. 1) had warm and shallow waters (2 to 4 m) with low transparency; waters are mostly lentic except for secondary and main rivers; vegetation was mostly of bank grasses and shrubs and boat traffic was medium. From the 19 initial habitat variables evaluated here, the best presence-absence model included transparency, distance to confluence and submerged vegetation (tables 1 and 2). The best sightings model was built with current and distance to streams (tables 1 and 2). Discussion and conclusions: On the study area, manatees use deeper lentic environments near to feeding areas, like streams or confluences, where they find shelter. Conectivity is important in the habitat of manatees, they could be using shallow lakes to feeding in times of the day not comprised in this study, but then traveled to deeper watercourses using confluences. Manatees have also been reported to use these environments in Central and South America. Along freshwater systems associated to Usumacinta River, manatee is still abundant, confirming this region as a key area for manatee conservation in México. Results of this study had been use to classify the region and to prioritize research and conservation actions in a landscape scale. Key words: freshwater systems, Generalized Linear Models, habitat, México, Sirenians, Usumacinta River. Resumen Conocer el hábitat de una especie ayuda a identificar características ecológicas clave para su manejo. Los sistemas fluvio-lagunares abarcan gran parte del hábitat del manatí Antillano. A pesar de esto, las características de su hábitat en estos sistemas aún son poco conocidas. El objetivo del presente trabajo fue explorar variables del hábitat relacionadas 1 División Académica de Ciencias Biológicas, Universidad Juárez Autónoma de Tabasco. Carretera Villahermosa-Cárdenas Km. 0.5 S/N entronque a Bosques de Saloya. Villahermosa 86039, Tabasco, México. E-mail: leon_olivera@yahoo.com. mx (LDOG), darwin.oikos@gmail.com (DJD). * Corresponding author
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