Indiana bat

Indiana bat
Name	Indiana bat
Status	Endangered
Status system	IUCN3.1
Genus	Myotis
Species	sodalis
Authority	Miller, 1897

Indiana bat The Indiana bat is a small, insectivorous North American bat recognized for its seasonal migrations between temperate United States hibernacula and summer roosts. It is listed as endangered under the Endangered Species Act and has been the subject of conservation actions involving federal, state, and nongovernmental organizations including the U.S. Fish and Wildlife Service, The Nature Conservancy, and multiple state wildlife agencies. Research on the species often involves collaborations with universities such as University of Kentucky, Pennsylvania State University, and Oklahoma State University.

Taxonomy and Description

The species was described by Gerrit S. Miller Jr. in 1897 and is placed in the genus Myotis, a diverse group that includes species like Myotis lucifugus and Myotis septentrionalis. Adults typically weigh 6–9 grams and have a forearm length of 36–41 mm; pelage coloration ranges from light brown to dark chocolate. Morphological diagnosis relies on cranial characters used in collections at institutions such as the Smithsonian Institution and the American Museum of Natural History, and genetic analyses have employed mitochondrial markers compared across specimens from the National Museum of Natural History and state museums. Distinguishing features compared with sympatric taxa are examined in keys used by the Society for the Study of Mammals and published by the American Society of Mammalogists.

Distribution and Habitat

Historically, the species occupied karst regions and upland forests across the Midwestern United States and Mid-Atlantic United States, with records from states including Indiana (U.S. state), Kentucky, Missouri, Illinois, West Virginia, Pennsylvania, Ohio, Tennessee, Alabama, Georgia (U.S. state), Maryland, New Jersey, and New York (state). Major winter hibernacula occur in cave systems such as those in Mammoth Cave National Park, the Cumberland Gap National Historical Park region, and karst complexes in Missouri Department of Conservation lands. Summer habitats include riparian corridors, mature deciduous forests, and urban greenways, with roost selection often associated with tree species managed by agencies like the U.S. Forest Service and the National Park Service. Conservation planning integrates landscape-scale data from the U.S. Geological Survey and state natural heritage programs.

Behavior and Ecology

The species is insectivorous, foraging over streams, floodplains, and forest openings for nocturnal insects tracked in studies supported by the National Science Foundation and published in journals such as Ecology and Journal of Mammalogy. Echolocation frequency parameters have been compared across populations using equipment and standards from the Acoustic Society of America; prey composition studies reference collections at the Smithsonian Institution. Roosting ecology includes use of exfoliating bark and cavities in trees managed under guidelines from the American Tree Farm System and studies by the Bat Conservation International; communal roosts support social thermoregulation discussed in literature from the International Union for Conservation of Nature. Seasonal migrations link hibernacula with maternity areas, patterns mapped with telemetry equipment funded by the U.S. Fish and Wildlife Service and analyzed using GIS platforms developed by the Esri company.

Reproduction and Life Cycle

Mating occurs in autumn swarming sites documented in cave inventories maintained by the National Speleological Society and occurs prior to hibernation; delayed fertilization results in spring implantation and summer birth timing that coincides with insect emergence monitored by the U.S. Geological Survey’s National Phenology Network. Females form maternity colonies in tree roosts and buildings; colony sizes and pup development have been quantified in demographic studies conducted by universities including University of Tennessee and Vanderbilt University. Longevity estimates derive from banding and recapture programs coordinated through state wildlife agencies and the Canadian Wildlife Service for comparative populations. Life-history parameters inform recovery planning under the Endangered Species Act and state endangered species statutes.

Threats and Conservation Status

Primary threats include white-nose syndrome, an emergent fungal disease caused by Pseudogymnoascus destructans first documented in sites linked to New York (state) caves and subsequently spreading across the species’ range; the epidemic has been addressed by research funded by the National Institutes of Health and the U.S. Fish and Wildlife Service. Habitat loss from forestry practices, urbanization, and wind-energy development involves stakeholders such as the Bureau of Land Management, Federal Aviation Administration when siting turbines, and state departments of transportation. Disturbance of hibernacula by recreational cavers coordinated through the National Speleological Society and timber harvests regulated by the U.S. Forest Service also contribute. The species’ endangered status under the Endangered Species Act and assessments by the IUCN inform legal protections and prioritization by NGOs including Defenders of Wildlife and The Nature Conservancy.

Management and Recovery Efforts

Recovery plans developed by the U.S. Fish and Wildlife Service outline actions such as hibernacula protection, decontamination protocols promoted by the National Speleological Society, and habitat conservation on lands managed by the U.S. Forest Service and National Park Service. Mitigation measures for wind-energy impacts have involved the Bureau of Ocean Energy Management and industry groups to implement operational curtailment and monitoring protocols recommended by the American Wind Wildlife Institute. White-nose syndrome management includes research into treatments and vaccines funded by the National Science Foundation and private foundations, and monitoring networks run by the NPS and state wildlife agencies. Collaborative efforts among universities, NGOs like Bat Conservation International, and federal partners aim to restore populations through habitat restoration, public outreach campaigns coordinated with the Boy Scouts of America and local conservation districts, and adaptive management guided by periodic status reviews under the Endangered Species Act.

Category:Myotis Category:Endangered species of the United States