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| bats of the United States | |
|---|---|
| Name | Bats of the United States |
| Status | various |
| Classification | Mammalia: Chiroptera |
bats of the United States
Bats in the United States comprise a diverse assemblage of Chiroptera representing families such as Vespertilionidae, Molossidae, and Phyllostomidae, and include species like the little brown bat and the Mexican free-tailed bat. These mammals occur from Alaska to Florida and from the Atlantic seaboard to Hawaii, occupying urban, agricultural, forested, and desert ecosystems tied to rivers, caves, and built structures. Their roles intersect with institutions and events that influence conservation policy, research funding, and public outreach across federal and state agencies.
Taxonomic treatments of North American Chiroptera draw on authorities like the American Society of Mammalogists, the Smithsonian Institution's National Museum of Natural History, and regional museums such as the Carnegie Museum of Natural History. Recognized taxa in the continental United States include genera Myotis, Eptesicus, Lasiurus, Perimyotis, and Tadarida, and insular records extend to species in Hawaii and Puerto Rico. Historic monographs by figures associated with the Museum of Comparative Zoology and the Field Museum shaped species descriptions alongside modern revisions published by institutions such as the American Ornithological Society and the Biological Society of Washington. Genetic studies using methods advanced at universities like Harvard, UC Berkeley, and the University of Florida have refined species limits and revealed cryptic diversity within groups such as the Myotis lucifugus complex and Lasiurus borealis. International frameworks, including assessments by the International Union for Conservation of Nature, inform nomenclatural stability, while federal listings under the Endangered Species Act guide legal status.
United States chiropteran distributions range from boreal Alaska populations near the Arctic National Wildlife Refuge and Glacier Bay National Park to subtropical assemblages in Everglades National Park and the Lower Rio Grande Valley. Eastern forests from the Great Smoky Mountains to the Adirondacks host foliage-roosting species, whereas western cave-rich landscapes in Carlsbad Caverns and Yosemite provide maternity and hibernacula for cave-dependent taxa. Urban-adapted species exploit bridges and buildings in metropolitan areas such as New York City, Los Angeles, and Chicago, and migratory corridors connect summer ranges in the Midwest to wintering grounds in Texas and Mexico. Island endemics occur in Hawaii and Puerto Rico, with historical declines influenced by introductions and habitat alteration documented by the U.S. Fish and Wildlife Service and The Nature Conservancy. Hydrological features governed by agencies like the U.S. Army Corps of Engineers affect riparian foraging habitats used by species documented in state natural heritage programs.
Foraging strategies span aerial hawking by species such as Tadarida brasiliensis to gleaning and foliage-roosting by species like Lasiurus species, with dietary specializations that include insectivory, nectarivory, and occasional frugivory observed in insular taxa. Echolocation call structure and flight morphology have been characterized in studies affiliated with Cornell Lab of Ornithology, the American Museum of Natural History, and research groups at Johns Hopkins University. Reproductive phenology includes maternity colony formation in spring and torpor or hibernation in winter; migratory behavior links populations across the Mississippi Flyway and the Central Flyway, patterns analyzed in research funded by the National Science Foundation and state wildlife agencies. Predator–prey interactions involve raptors monitored by the Audubon Society and mesopredators recorded by state departments of natural resources, while parasite and pathogen dynamics overlap with research at the Centers for Disease Control and Prevention and university veterinary programs.
Populations exhibit variable conservation status from secure species managed under state wildlife action plans to imperiled taxa listed by the U.S. Fish and Wildlife Service and assessed by the IUCN. Primary threats include white-nose syndrome, a fungal disease first identified in caves within New York and studied by the U.S. Geological Survey and academic partners, as well as habitat loss from urban expansion, agricultural intensification, and energy development such as wind farms regulated by the Bureau of Land Management. Climate change impacts modeled by NOAA and the Intergovernmental Panel on Climate Change affect phenology and range shifts, while invasive species and pesticide use documented by the Environmental Protection Agency influence insect prey availability. Conservation responses include cave gating projects coordinated by The Nature Conservancy, species recovery plans under the Endangered Species Act, and mitigation guidelines developed by the Federal Aviation Administration and state transportation departments for wind-energy siting.
Bats contribute substantial ecosystem services, notably insect suppression valued in agricultural regions like the Midwest and California Central Valley, and these services inform collaborations with the U.S. Department of Agriculture and extension programs at land-grant universities. Human–bat encounters occur in recreational caves managed by the National Park Service and in urban roosts on private and municipal properties, leading to outreach efforts by Bat Conservation International and state bat working groups. Public health agencies, notably the CDC and state health departments, issue guidance on rabies exposure, wound care, and bat exclusion, while zoonotic surveillance programs at veterinary schools monitor spillover risks. Legal frameworks encompassing nuisance abatement ordinances and protections under the Migratory Bird Treaty Act (where applicable to co-occurring species) shape management options.
Monitoring approaches include acoustic surveys using bat detectors deployed by university labs, mist-netting and harp-trapping protocols standardized by the North American Bat Monitoring Program, and radio-telemetry and GPS tagging projects coordinated by research programs at institutions like Texas A&M and the University of Tennessee. Long-term population assessments utilize hibernaculum counts in cave systems monitored by state natural heritage programs and citizen-science initiatives such as those organized by Bat Conservation International and local Audubon chapters. Laboratory analyses of pathogens and genetics are conducted in facilities at the CDC, USDA, and university molecular ecology labs, while decision-support tools and habitat models are developed in collaboration with federal agencies including the U.S. Fish and Wildlife Service, NOAA, and the USGS.