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Activity of insectivorous bats associated with cattle ponds at La Michilia Biosphere Reserve, Durango, Mexico: implications for conservation

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Lopez-Gonzalez C., Gomez-Ruiz E. P., Lozano A., Lopez-Wilchis R.

Acta Chiropterologica

2015

tom 17

nr 1

Most bats depend strongly on surface water to survive and reproduce, and thus it is a limiting resource in markedly seasonal environments, such as semiarid and temperate Mexico. Cattle ranching, an important activity in these areas has resulted in construction of rainwater reservoirs that may represent the only available surface water during the dry season. Using acoustic detectors we measured activity in cattle ponds at La Michilía Biosphere Reserve, Durango, Mexico to assess patterns of use by insectivorous bats. We tested for differences in activity between ponds and seasons, and for relationships between bat activity and a set of environmental and pond variables. Bat activity was significantly higher at ponds in the dry season; ponds were used by aerial, trawling, and gleaning insectivores. In the rainy season gleaners did not use ponds, and the other guilds used them less frequently. Larger, older ponds with aquatic vegetation were used more frequently in the dry season, whereas maximum temperature and moon phase affected use in the rainy season. Cattle ponds are common in rangelands and forests of northern Mexico; they constitute important foraging and drinking resources in an area that harbors the largest populations of insectivorous bats in the world

Activity of Insectivorous bats is related to water availability in a highly modified Mexican temperate forest

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Lopez-Gonzalez C., Lozano A., Gomez-Ruiz E. P., Lopez-Wilchis R.

Acta Chiropterologica

2016

tom 18

nr 2

Artificial ponds are important foraging and drinking resources for bats at La Michilía, a temperate forest with a marked seasonal drought. Using acoustic data we tested the hypothesis that water availability restricts bat activity in the dry season to ponds, whereas in the rainy season resources are widely available and therefore used throughout the area. We compared bat activity at six ponds with that of a 500-meter transect perpendicular to each pond. We predicted that activity would be higher at ponds in the dry season, whereas in the rainy season activity should be equal or higher at transects. Also, all species guilds would use ponds in the dry season, whereas gleaners, edge aerial and open aerial foragers would be more frequent at transects in the rainy season. In no instance activity was higher at transects than at ponds during the rainy season. Open areas showed little or no bat activity in the dry season, but were very active in the rainy season. One transect located in dense forest and one near human dwellings were active both seasons. Open aerial foragers were present mostly on ponds in the dry season, and on ponds and transects in the rainy season; edge aerial bats were common in ponds in the dry season, but rare in transects in the rainy season. Trawling bats used ponds and transects in both seasons; and gleaners were rare over ponds and transects in both seasons. Because bats use the local habitat differently depending on season and feeding guild, and climate and seasonality vary greatly in Mexican temperate forests, conservation strategies can not be generalized, but should be implemented on a case-by-case basis.

Ograniczanie wyników

2 Acta Chiropterologica

2 Gomez-Ruiz E. P.

2 Lopez-Gonzalez C.

2 Lopez-Wilchis R.

2 Lozano A.

1 2016

1 2015

Wyniki wyszukiwania

Activity of insectivorous bats associated with cattle ponds at La Michilia Biosphere Reserve, Durango, Mexico: implications for conservation

Activity of Insectivorous bats is related to water availability in a highly modified Mexican temperate forest