Distributional patterns of the Brazilian free-tailed bat Tadarida brasiliensis in the Peruvian territory

Authors

  • Orlando Zegarra Museo de Historia Natural, Universidad Nacional Mayor de San Marcos. Av. Arenales 1256, Lima 15072, Perú.
  • Jaime Pacheco Centro de Investigación Biodiversidad Sostenible (BioS), Francisco de Zela 1556, Lima 14. Lima, Perú.
  • Víctor Pacheco 1Museo de Historia Natural, Universidad Nacional Mayor de San Marcos. Av. Arenales 1256, Lima 15072, Perú.

Keywords:

Andes, geographic barrier, maxent, potential distribution, suitability.

Abstract

The molossid bat Tadarida brasiliensis has a wide and apparently continuous distribution in South America. Although it has been reported in several localities of both versants of the Peruvian Andes, the potential distribution for this species has not been formally analyzed. Therefore, we describe its distributional pattern in the territory and provide comments about the possible influence of the Andes in its distribution. We gathered occurrence records from museums, acoustic surveys, literature, GBIF and Vertnet sources, and we selected localities to minimize spatial correlation. After defining a minimum-convex polygon of Peruvian records as background area, we use Maxent software with bioclimatic variables to construct species distribution models. Several models were evaluated using different metrics, and the model with the lowest AICc was selected. Then, the model was projected for Peruvian territory. Tadarida brasiliensis is reported for the first time in Cajamarca, Piura and Ica departments. The potential distribution model showed two disjunct suitable areas, one for the Pacific versant and other for the Amazonian versant of the Andes, but connected with moderate suitable conditions in the Huancabamba Depression region in northern Perú. Mean diurnal range and annual mean temperature were identified as the main limiting factors for the potential distribution of this species in this territory. Tadarida brasiliensis exhibits a discontinuous distribution in the Peruvian territory. In northern part, the Huancabamba depression zone has climatic conditions that may allow the east-west dispersal for this species. In central and southern parts, the higher crest of the Andes (> 4,500 m) has low suitable conditions due to the extreme climate. In the eastern, the lowland Amazonian forests has low suitability for this species, probably due to high temperatures. We suggest that the Andes could be acting a biogeographical barrier that limits the dispersal for this species, but population-genetic studies are needed to confirm this hypothesis. We identified that temperature is the main climatic factor that limit the dispersal of this bat. In conclusion, T. brasiliensis is mainly associated with desert and Andean slopes ecosystems in Perú, and we highlight the importance of incorporating acoustic records in the analysis of its distribution patterns.

Author Biography

Orlando Zegarra, Museo de Historia Natural, Universidad Nacional Mayor de San Marcos. Av. Arenales 1256, Lima 15072, Perú.

I am a biologist, with emphasis in ecology, from the Universidad Nacional Agraria La Molina, Perú.From my early years I developed scientific research on wildlife, participating in ecology projects and undergraduate thesis. In my second year of study I won my first funding for scientific research, on mammals in the forest of a Regional Development Institute; and since then I have continued in this work.I have been a volunteer for 3 years in the Mammalogy division of the Center for Ornithology and Biodiversity (CORBIDI) and, after that, 2 years, as a volunteer and practitioner, in the Department of Mammalogy of the Natural History Museum of San Marcos (MHN); performing, in both institutions, healing and determination of mammal species from Peru from the private sector and research.I have about 6 years of experience in mammal research in the field and 3 years of experience as an environmental consultant, in several regions of Peru, both within and outside protected natural areas, reaching international border areas and regions of high importance, for oil and gas extraction, as well as for the conservation of Neotropical biodiversity (Manu National Park, Yanachaga - Chemillén National Park, etc.).I am currently a member of the Peru Conservation of Bats Program (PCMP), Association of Mammalogist of Peru (AMP) and the Small Mammal Specialist Group of The Species Survival Commission (SSC) of the International Union for the Conservation of Nature (IUCN).My main interest is to conduct studies on mammals, specially in bats, in a way that contributes to the conservation of their ecosystems and their species.

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