2/28/2024 0 Comments Big brown bats hibernateLittle Brown Bats in Michigan were solitary much more often than in the East. Hibernation lasts until April or early May, but in coastal regions bats may arouse in late winterlittle brown bats have been found feeding in the Puget Sound region in mid-March. Seventy-five percent of Northern Bats and 22% of Little Brown Bats roosted alone, rather than cluster with other bats. as the big brown bat, that can hibernate in relatively exposed situations in buildings where there is considerable fluctuation in temperature. Maximum ambient temperature, presence of standing water, and water vapor pressure deficit were potential predictors of the number of Myotis that was present. Relative to Little Brown Bats, Northern Bats were more common in the mines of the Upper Peninsula than in hibernacula in the East and Ohio River Valley. In the winter, it may hibernate in a cave, but typically inhabits a dry area such as an attic where the white-nose fungus cannot survive. In summer, it lives in buildings and trees. Ninety percent of hibernating animals were Myotis lucifugus (Little Brown Bat), and almost 10% were M. Big Brown Bat (Eptesicus fuscus) The Big Brown Bat has a glossy exterior and range from 4.3 to 5.1 in length with a 12 to 13-inch wingspan. Perimyotis subflavus (Eastern Pipistrelle) and Eptesicus fuscus (Big Brown Bat) accounted for only 0.5% of the total of 244,341 bats that were observed. Number of bats varied from 1 to > 55,000, although the median was 115. Overall, occupied sites were more structurally complex, longer (307 ± 865 m), and warmer (5.7 ± 3.0 ✬) than unoccupied mines. Unoccupied sites typically were short (19 ± 17 m SD) and/or experienced chimney-effect airflow, which led to temperatures near or below freezing (-0.8 ± 2.9 ✬). Prior to arrival of white-nose syndrome, we found bats hibernating in 82 of 119 abandoned mines in northern Michigan. The researchers determined that hibernating over one winter extends a big brown bat's epigenetic clock a biological marker of agingby three-quarters of a year.
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