northern long-eared bats: forest management and policy...bats save the agricultural community...
TRANSCRIPT
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Environmental
& Statistical
Consultants
Northern Long-eared Bats: Forest Management and Policy
Tim Sichmeller
April 2015
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Forest Bats
Eastern Red Bat in Flight
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Insectivores
Bats save the agricultural community roughly $3 billion dollars a year in pest control
A single little brown bat, which has a body no bigger than an adult’s thumb, can eat 4 to 8 grams (the weight of about a grape or two) of insects each night
The loss of the one million bats in the Northeast has probably resulted in between 660 and 1320 metric tons of insects no longer being eaten each year by bats in the region
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Bats of the Great Lakes Region
Silver-haired bat
Eastern red bat
Hoary bat
Big brown bat
Evening bat
Tri-colored bat
Eastern small-footed bat
Little brown bat
Northern long-eared bat
Indiana bat
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Bats of the Great Lakes Region
Silver-haired Bat
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Bats of the Great Lakes Region
Eastern Red Bat
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Bats of the Great Lakes Region
Hoary Bat
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Bats of the Great Lakes Region
Big Brown Bat
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Bats of the Great Lakes Region
Evening bat
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Bats of the Great Lakes Region
Tri-Colored Bat
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Bats of the Great Lakes Region
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Bats of the Great Lakes Region
Eastern Small-footed Bat
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Bats of the Great Lakes Region
Little Brown Bat
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Bats of the Great Lakes Region
Northern Long-eared Bat
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Bats of the Great Lakes Region
Indiana Bat
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Lifecycle of bat
Fall
August 15 – November
Swarming and mating
Move towards hibernaculum
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Fall Swarm
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Lifecycle of bat
Winter
October – April
Move into hibernating locations
Typically caves and mines
1 to 1,000’s of bats together
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Hibernating Indiana Bats
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Lifecycle of bat
Spring
April 1 to May 14
Begin migrating to summer maternity sites
Can travel between 8 – 350 miles to maternity sites
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Lifecycle of bat
Summer
May 15 – August 15
Females form maternity colonies (30 – 60 bats)
NLEB forage and roost mainly in upland, mature forests with occasional foraging over forest clearings, water and along roads
Give birth and raise pups
Pups able to fly within 3 – 5 weeks
At the end of season maternity colonies will begin to disperse to head to fall swarming sites
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Maternity Roost
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Foraging and Roosting Habitat
NLEB foraging habitat:
Typically more cluttered, interior forest than other species
Smaller foraging range than other species (~1,000 ha in Indiana)
NLEB roosting habitat:
Switching roosts ~ 3 trees every 5 days
Use a variety of different species of trees and different size trees
Smaller ranges than other forest bat species
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Survey Methods
Fall swarm and migration
Use harp nets around known swarm sites and hibernaculum to get a census of species using the hibernaculum
Spring migration
Again use harp nets to capture bats exiting the hibernaculum and attach transmitters to know direction and distance for spring migration
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Harp Traps
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Survey Methods
Winter hibernaculum
Full cave surveys to count and ID species present
Also check for presence of White Nose Syndrome (WNS)
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Survey methods
Summer surveys
For NLEB and MYSO it is spelled out by USFWS
Surveys between May 15 and August 15
1) Habitat assessment
2) Acoustic surveys
3) Mist-net surveys
4) Radio telemetry
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Summer Surveys
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Summer Surveys
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Summer Surveys
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Summer Surveys
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Summer Surveys
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Summer Surveys
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Threats to bats
White Nose Syndrome (WNS)
Confirmed at Soudan Underground Mine State Park and Forestville/Mystery Cave State Park
Spreading west
WNS has killed more than 5.7 million bats in eastern North America.
In some hibernacula, 90 to 100 percent of bats have died
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WNS
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WNS
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Threats to bats
Other threats
Wind turbines
Habitat loss
Hibernaculum disturbance
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Listing Decision for Northern Long-eared Bats
On April 1, 2015 the U.S. Fish and Wildlife Service listed the NLEB as THREATENED under the Endangered Species Act
Difference between Endangered and Threatened
Endangered: any species that is in danger of extinction throughout all or a significant portion of its range
Threatened: any species that is likely to become an endangered species within the foreseeable future throughout all or a significant portion of its range
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Listing Decision for Northern Long-eared Bats
The rules applied to this listing become effective on May 4, 2015
Interim Final 4(d) Rule Proposed
In NLEB range, all purposeful take is prohibited except:
Removal of NLEB from human structures
Actions relating to capture, handling, and related activities for NLEB by individuals permitted to conduct these activities for species of bats
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Listing Decision for Northern Long-eared Bats
Incidental Take – When take of bats is a side effect of otherwise lawful actions. An example of incidental take would be if bats roosting in a tree are killed when the tree is cut for harvest or clearing purposes.
Areas not affected by WNS
4(d) rule exempts incidental take from all activities
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Listing Decision for Northern Long-eared Bats
Areas affected by WNS
Exempted activities include:
Forest management practices
Maintenance and limited expansion of transportation and utility ROW’s
Prairie habitat managament
Limited tree removal projects, provided these activities protect known maternity colonies and hibernacula
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WNS Buffer Zone
USFWS has identified areas within 150 miles of the boundaries of U.S. counties where the fungus Pd. or WNS has been detected
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WNS Buffer Zone
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Listing Decision Impacts on Forestry
The Service considers forest management practices to include a suite of activities used to maintain and manage forest ecosystems, including, but not limited to, timber harvest and other silvicultural treatments, prescribed burning, invasive species control, wildlife openings and temporary roads
The conversion of mature hardwood, or mixed forest into intensively managed monoculture pine plantation stands is not exempted under this interim rule, as typically these types of monoculture pine plantations provide very poor-quality bat habitat
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FAQ for Forestry
7) Has a northern long-eared bat maternity roost tree or hibernacula been documented on or near the project area?
YES Continue to question 8.
NO
The incidental take that may result from your project is exempted by the 4(d) rule and no further action is necessary to comply with ESA prohibitions to protect northern long-eared bats.
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FAQ for Forestry
I DON’T KNOW
We suggest that you contact the U.S. Fish and Wildlife Service Ecological Services Field Office nearest to your project area. Field Office locations and contact information may be found at www.fws.gov/offices. If you are in Wisconsin, please contact the Twin Cities Field Office.
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FAQ for Forestry
8)
Northern long-eared bats use their maternity roost trees and hibernacula repeatedly for many years. Unless a survey or other information indicates otherwise, if the habitat around a roost is intact and the tree is suitable, we would conclude that the tree is likely an occupied maternity roost during the pup season (June 1 - July 31). Similarly, we would assume that a hibernaculum remains occupied unless a survey or other information indicates otherwise.
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Question 8 Continued
Therefore, if you have a northern long-eared bat roost tree or hibernacula documented on or near your project area, any incidental take of bats will be exempted by the 4(d) rule if you follow these conservation measures:
Do not conduct any activities within ¼ mile of known, occupied hibernacula;
Do not cut or destroy a known, occupied roost tree from June 1 to July 31 (the pup season);
Do not clearcut (and similar harvest methods that cut most or essentially all trees from an area, e.g., seed tree, shelterwood, and coppice) within a ¼ mile of known, occupied roost trees from June 1 to July 31.
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Definitions
“Known, occupied hibernacula’’ - locations where one or more northern long-eared bats have been detected during hibernation or at the entrance during fall swarming or spring emergence. Given the documented challenges of surveying for northern long-eared bats in the winter (use of cracks, crevices), any hibernacula with northern long-eared bats observed at least once, will continue to be considered “known hibernacula” as long as the hibernacula and its surrounding habitat remain suitable for northern long-eared bat. However, a hibernaculum may be considered to be unoccupied if there is evidence (e.g., survey data) that it is no longer in use by northern long-eared bats.
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Definitions
Known roost trees – trees that northern long-eared bats have been documented as using during the active season (approximately April – October). Once documented, a tree will be considered to be a “known roost” as long as the tree and surrounding habitat remain suitable for northern long-eared bat. However, a tree may be considered to be unoccupied if there is evidence that the roost is no longer in use by northern long-eared bats.
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Listing Decision for Northern Long-eared Bats
Additional information can be found at:
www.fws.gov/midwest/endangered/mammals/nleb
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