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Trinity River NWR November 2007 Staff Report
Southwest Region, December 5, 2007
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WB Lomas and volunteer Anthony Dagle, in accordance with a project studying Rafinesque's big-eared bats maternity roost conditions, radiotracked six tagged bats.  They found a natural bat roost tree in the middle Ander's Pond.  Occupancy was recorded in the tree for about a week.  For at least two days, 2 tagged bats were known to have used the natural roost.  These two bats were caught in different locations but were found roosting together.  It was a 30 ft tupelo gum tree (Nyssa aquatica) with a hollow at the top of the tree.  The location of the entrance hole made it difficult to place a datalogger that is needed to measure the conditions in the tree, inside the tree.  Radiotelemetry also was useful in tracking bats that were hiding in hard to see places in the roosts.  In two cases, occupancy would not have been detected at all had radiotelemetry been used to find bats in the attic of the farm house.  Bats were also banded for individual identification.  The bands were very useful in telling bats apart once the radiotags fell off.  No mortalities or injuries were experienced.  The trapping with continue in April, before the bats begin giving birth to pups.

Contact Info: Martin Valdez, 505-248-6599, martin_valdez@fws.gov



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