Abstract
The use of camera traps and mammal track search are complementary methods to monitoring species of which is not well documented their natural history, as in the case of medium and large mammals. To ensure its conservation and good management, it is necessary to generate information about the structure of the community and their populations. The objective of the present study was to estimate the diversity, relative abundance and activity patterns of medium and large mammals in a tropical deciduous forest located in the Isthmus of Tehuantepec, Oaxaca, Mexico. Samplings were conducted in three month intervals, from September 2011 to May 2013. We used photographic-sampling and track search, two complementary sampling methods. For photographic-sampling, 12 camera traps were placed covering an area of 60 km2, while for the tracks search a monthly tour of four line-transect surveys of three kilometers length each was undertaken. We obtained a total of 344 pictures with 5292 trap-days total sampling effort; in addition, 187 track records in a total of 144 km. With both methods we registered 21 species of mammals, in 13 families and seven orders, and five species resulted in new records to the area. The diversity index of Shannon-Wiener obtained with the method of tracks was H' = 2.41, while the most abundant species were Urocyon cinereoargen- teus (IAR = 0.23) and Pecari tajacu (IAR = 0.20). By the method of trap the most abundant species were P. tajacu (IAR = 2.62) and Nasua narica (IAR = 1.28). In terms of patterns of activity P. tajacu, N. narica and Odocoileus virginianus were primarily diurnal species; Canis latrans and Leopardus pardalis did not show preference for any schedule in particular, and Didelphis virginiana and Dasypus novemcinctus preferred to have nocturnal activity. This information can be of help to the creation of programs of management and conservation of mam- mals of medium and large in the Isthmus of Tehuantepec, Oaxaca, México.
Highlights
Materiales y MétodosÁrea de estudio: Se localiza dentro del Área Comunal Protegida llamada Ojo de Agua Tolistoque y Sierra Tolistoque, en el distrito de Juchitán, en la Planicie Costera de Tehuantepec, Oaxaca, México, a una altitud entre 100 y 400msnm, dentro de las coordenadas 16°38 ́ a 16°30 ́N-94°55’ a 94°50’ W (Ortega et al, 2010; Ortíz-Pérez, Hernández, & Figueroa, 2004)
El Istmo de Tehuantepec, al sur de México, es una de las regiones de mayor relevancia biogeográfica para muchos vertebrados terrestres (Ramamoorthy, 1998), en esta zona se presentan procesos de especiación activa y diferenciación poblacional (Orr, & Smith, 1998; Peterson, Soberón, & Sánchez-Cordero, 1999)
Esta región es considerada por diferentes instancias nacionales e internacionales de importancia para la conservación
Summary
Área de estudio: Se localiza dentro del Área Comunal Protegida llamada Ojo de Agua Tolistoque y Sierra Tolistoque, en el distrito de Juchitán, en la Planicie Costera de Tehuantepec, Oaxaca, México, a una altitud entre 100 y 400msnm, dentro de las coordenadas 16°38 ́ a 16°30 ́N-94°55’ a 94°50’ W (Ortega et al, 2010; Ortíz-Pérez, Hernández, & Figueroa, 2004). El modelo de acumulación de especies que mejor se ajustó a los datos para ambos métodos fue el de Clench, dicho modelo sugiere que en el área de estudio no se ha llegado a la asíntota, el modelo predice que se pueden encontrar 23 especies con el método de fototrampeo (a=3.91 y b=0.16) y 17 especies con el método de rastros (a=15.27 y b=0.87), por lo que se tiene una representatividad del 78% y 92% de las especies para cada método. El índice de Berger-Parker indica una dominancia baja para todo el estudio (D=0.18), mientras que para la temporada seca fue mayor (D=0.31) (Cuadro 2). Las especies con mayor abundancia relativa por el método de fototrampeo fueron P. tajacu (IAR=2.62, n=139), N. narica (IAR=1.28, n=68), mientras que siete especies fueron menos abundantes (IAR=0.019, n=1); para ambas temporadas P. tajacu fue la especie más abundante con un IAR=3.47, n=90 en secas y.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
