Bio. 226: Biological Diversity 2003
Species: Myotis sodalis
Red List of Threatened Species
Division of Fish and Wildlife Nongame and Endangered Wildlife Program
York State Department of Environmental Conservation
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Myotis sodalis - the Indiana, or Social, Bat
The Indiana Bat, Myotis sodalis, is a small, brownish insectivorous bat that was first described in Indiana in 1928 (Green Mountain National Forest: Forest Factsheet). It is currently endangered, due to human disturbances in the caves where this bat hibernates in the winter and habitat loss. In Indiana its conservation is the responsibility of the DNR Division of Fish and Wildlife Nongame and Endangered Wildlife Program.
Introduction - Data
Myotis sodalis is listed as EN A1c in the IUCN Red List of Threatened Species, indicating that it is endangered. This is due to a population drop of 50% in the last 10 years caused by habitat loss.
The Indiana bat, Myotis sodalis, is listed as an endangered species within its entire range, and has been given the code En A1c (IUCN list). This code signifies that the population of the species has dropped over 50% in the last ten years. The main cause of the decline in M. sodalis population is the human destruction of their habitat. There are a number of ways that humans have directly and indirectly ruined these bats’ habitat. The caves that the bats use for shelter, hibernation, breeding grounds, and for socializing are being turned into tourist sites and are being industrialized, making them unsuitable for the bats’ survival. Destruction of even a small number of caves is a very serious threat to the species, as thousands and thousands of bats can inhabit a single cave.
bats thrive when their roosting caves are left undisturbed, and they
suffer when they are intruded upon. The main factor in the decline of
the M. sodalis population is the intrusion into their caves
by people. Cave tours, spelunkers, vandals, and researchers all take
a toll on these sensitive animals (eNature).
Cave commercialization has a number of negative effects on bat habitats.
For example, the improper gating of cave entrances and construction
for cave commercialization have altered cave environments, rendering
some caves unsuitable for Indiana bat hibernation (Clawson).
Bat Conservation International. 2002. BCI-bat species: US species: Myotis sodalis. http://www.batcon.org/discover/species/mysodal.html. Accessed 2003 March 29.
Clawson, Richard L .1997. Indiana Bats: Down for the Count. BATS Magazine. Bat Conservation International (BCI), http://www.batcon.org/batsmag/v5n2-4.html. Accessed 2003 March 30.
Drobney, Ronald D. and Clawson, Richard L. (no date) Indiana Bats. http://biology.usgs.gov/s+t/frame/c164.htm Accessed 2003 March 30
(no date). Indiana Myotis - eNature.com. http://www.enature.com/fieldguide/showSpeciesGS.asp?
Green Mountain National Forest. 2002 September 4. Indiana bat. http://www.fs.fed.us/r9/gmfl/resource%20management/indianabat.htm. Accessed 2003 March 28.
IUCN 2002. 2002 IUCN Red List of Threatened Species. Downloaded on 29 March 2003. http://www.redlist.org/search/details.php?species=14136 (site specified citation)
Telemetry Project. 2001. Bat Conservation and Management Telemetry.
New York State Department of Environmental Conservation. 2003 March 1. Indiana Bat Fact Sheet. http://www.dec.state.ny.us/website/dfwmr/wildlife/endspec/inbafs.html. Accessed 2003 March 29.
University of Michigan - Museum of Zoology - Animal Diversity Web. 1997 Febuary 25. Myotis sodalis (indiana bat): narrative. http://animaldiversity.ummz.umich.edu/accounts/myotis/m._sodalis. Accessed 2003 March 29.
USDA Forest Service pdf file. date unknown. Indiana bat - Myotis sodalis. http://www.fs.fed.us/r9/hoosier/planningdocs/related_docs/part_two_ba.pdf. Accessed 2003 March 28.
U.S. Fish and Wildlife Service. (no date) Indiana Bat Fact Sheet http://midwest.fws.gov/Endangered/mammals/ind_bat.html. Accessed 2003 March 30.
U.S. Fish and Wildlife Service. 2003 March 29. Species profile for indiana bat. http://ecos.fws.gov/servlet/SpeciesProfile?spcode=A000. Accessed 2003 March 29.
U.S. Fish and Wildlife Service. (no date) Six Points Environmental Assessment. http://midwest.fws.gov/NEPA/SixPoints/index.html. Accessed 2003 March 30.
U.S. Fish and Wildlife
Service. 2001 September 19. Habitat Conservation Plan for the Six Points
Road Interchange and Associated Development (PDF file). http://midwest.fws.gov/NEPA/SixPoints/hcpfinaldraft901.PDF.
Accessed 2003 March 30.
Alexandra Turnbull and Adam Morris
Creation/revision date: 11 Feb. 2003 / 4April 2003