Acoustic Detection Reveals Fine-Scale Distributions of Myotis lucifugus, Myotis septentrionalis, and Perimyotis subflavus in Eastern Nebraska

نویسندگان

  • Jeremy A. White
  • Cliff Lemen
  • Patricia Freeman
  • Cliff A. Lemen
  • Patricia W. Freeman
چکیده

—Before white-nose syndrome arrives in Nebraska, it is important to document the preexposure distributions of cave bats in the state. We examined the distributions of Myotis lucifugus (little brown myotis), Myotis septentrionalis (northern long-eared myotis), and Perimyotis subflavus (tri-colored bat) in eastern Nebraska by setting acoustic detectors for a single night at 105 sites in wooded habitats during summers of 2012 and 2014. We compared 2 methods of determining presence at each site. Results of our analyses are fine-scale distributional maps for these bats and some range extensions from published records. Results for M. septentrionalis and P. subflavus are largely consistent with previous reports. Results for M. lucifugus vary depending on the method of determining presence; however, our preferred method creates a pattern consistent with the known vouchered distribution of this species. The differences between published distributions of these species and distributions based on acoustic detection from our study might result from a lack of extensive netting in many areas of eastern Nebraska, underrepresentation of P. subflavus from mist net surveys in Nebraska, and a recent westward range expansion of P. subflavus and M. septentrionalis in southern Nebraska. RESUMEN.—Es importante documentar la distribución de la pre-exposición de los murciélagos al síndrome de la nariz blanca antes de que llegue a Nebraska. Estudiamos la distribución de Myotis lucifugus (murciélago pequeño café), Myotis septentrionalis (murciélago orejudo septentrional) y Perimyotis subflavus (murciélago tricolor) en la zona este de Nebraska estableciendo detectores acústicos durante una sola noche en 105 sitios en hábitats boscosos durante los veranos de 2012 y 2014. Comparamos dos métodos para determinar la presencia en cada sitio. Obtuvimos mapas de distribución de escala detallada de estos murciélagos, como resultado de nuestros análisis, y algunas extensiones de su rango de distribución a través de publicaciones anteriores. Los resultados con respecto a M. septentrionalis y P. subflavus son consistentes con informes anteriores. Los resultados de presencia de M. lucifugus varían dependiendo del método utilizado. Sin embargo, nuestro método preferido creó un patrón consistente con la distribución conocida de esta especie. Las diferencias entre las distribuciones publicadas para estas especies y las distribuciones basadas en la detección acústica de nuestro estudio podrían ser el resultado de la falta de un redeo extensivo en varias zonas del este de Nebraska, de la subrepresentación de P. subflavus en los monitoreos con redes de niebla en Nebraska, y de la reciente expansión de distribución de P. subflavus hacia el oeste y de M. septentrionalis hacia el sur de Nebraska. 1Department of Biology, University of Nebraska at Omaha, Omaha, NE 68182. E-mail: [email protected] 2School of Natural Resources and University of Nebraska State Museum, University of Nebraska–Lincoln, 428 Hardin Hall, Lincoln, NE 68583-0974.

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تاریخ انتشار 2016