Indiana Bat

2007 Population Estimates

 

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Estimates are based on winter surveys conducted at all known Priority 1 and 2 hibernacula throughout the species' range. Data from Priority 3 and 4 hibernacula has also been included for states that conducted surveys at these sites in 2006 or 2007.

 

USFWS Region	State	2001	2003	2005	2007	% Change from 2005	% of 2007 total
Region 2	Oklahoma	0	5	2	0	-100.00%	0.0%
Region 3	Indiana	173,076	183,337	206,610	238,009	15.2%	46.4%
	Missouri	67,900	67,089	65,157	64,554	-0.9%	12.6%
	Illinois	21,053	43,028	54,630	54,033	-1.1%	10.5%
	Ohio	9,788	9,831	9,769	7,629	-21.9%	1.5%
	Michigan	20	20	20	20	0.0%	0.0%
	Total	271,837	303,305	336,186	364,245	8.3%	70.9%
Region 4	Kentucky	49,999	48,535	63,211	68,668	8.6%	13.4%
	Tennessee	9,258	9,265	9,971	8,410	-15.7%	1.6%
	Arkansas	2,475	2,228	2,067	1,779	-13.9%	0.3%
	Alabama	173	265	296	258	-12.8%	0.1%
	Total	61,905	60,293	75,545	79,115	4.7%	15.4%
Region 5	New York	29,642	32,924	41,702	52,696	26.4%	10.3%
	Pensylvania	702	853	746	1,038	39.1%	0.2%
	West Virginia	9,714	9,742	13,417	14,597	8.8%	2.8%
	Virginia	833	1,090	735	723	-1.6%	0.1%
	New Jersey	107	644	652	659	1.1%	0.1%
	Vermont	159	472	297	325	9.4%	0.1%
	Total	41,157	45,725	57,549	70,038	21.7%	13.6%
Rangewide Total:		374,899	409,328	469,282	513,398		100.00%
2-yr. Net Increase of:			34,429	59,954	44,116
% Increase of:			9.2%	14.6%	9.4%

 

 

NOTE: Missouri's 2001-2007 estimates assume 50,550 Indiana bats in Pilot Knob Mine based on previously calculated capture rates by R. Clawson and others.

 

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Compiled by Andy King, U.S. Fish & Wildlife Service, Bloomington, Indiana, Ecological Services Field Office from data gathered from bat biologists throughout the species' range. (andrew_king@fws.gov)

 

Indiana Bat Rangewide Population 1981-2007

 

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