Field Notes
U.S. Fish & Wildlife Service
Field Notes Entry   
Presentation on Karst Invertebtares Made to Austin ESFO
Southwest Region, November 5, 2007
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On November 5, 2007, Dr. Jean Krejca, a private consultant in the Austin area, gave a brown bag presentation at the Austin ESFO on her recent research, funded by a section 6 grant, that estimated the probability of detecting karst invertebrates. Dr. Krejca examined the current Service requirement of three surveys to determine the presence or absence of endangered karst invertebrates by assessing the probability of detecting one listed and two rare karst invertebrate species. She also assessed whether certain environmental conditions influenced the probability of detecting them. She found that 10-22 surveys are necessary to have a 95% probability of detecting karst invertebrates if present and that environmental attributes did not influence detection. Her results also indicated that a significant portion of the time, karst invertebrates are not available to be surveyed and she hypothesized that they retreat into humanly inaccessible cracks (mesocaverns) connected to the cave.

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