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Stratman, T., Barrett, K., Floyd, T., Maerz, J., Nibbelink, N., & Hickey, J. , Monitoring rare species: Developing methods to locate and survey for the endangered bog turtle (glyptemys muhlenbergii) - abstract. Unpublished paper presented at Program and Abstracts of the Tenth Annual Symposium on the Conservation and Biology of Tortoises and Freshwater Turtles.
Added by: Admin (06 Jan 2014 18:23:12 UTC) |
| Resource type: Conference Paper BibTeX citation key: Stratman2012 View all bibliographic details  |
Categories: General Keywords: Emydidae, Glyptemys muhlenbergii, Habitat - habitat, Nordamerika - North America, Schildkröten - turtles + tortoises Creators: Barrett, Floyd, Hickey, Maerz, Nibbelink, Stratman Collection: Program and Abstracts of the Tenth Annual Symposium on the Conservation and Biology of Tortoises and Freshwater Turtles |
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| Abstract |
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North America’s smallest turtle, the Bog Turtle (Glyptemys muhlenbergii), is Critically Endangered under the IUCN Red list, mainly due to habitat loss and deterioration. It is extremely difficult to assess Bog Turtle population status, as this turtle is cryptic and rare. In addition, monitoring efforts are often done in a manner that cannot be used to estimate species detection rates, population abundance, or population viability. Time-effective methods of surveying for new populations are also largely lacking. To address these deficiencies we are (1) developing a species distribution model (SDM) for the Bog Turtle to better predict where habitat is suitable across their range, (2) determining the best trapping methodology and minimal effort required to determine with confidence whether Bog Turtles are present at a site, and (3) testing the SDM and trapping methodology in South Carolina where Bog Turtles have not been seen in over a decade. In the summer of 2011 eight Georgia bogs with known populations were trapped. Trapping effort was quantified by time and area by dividing suitable trapping area into 5 x 5 meter grid cells, with one trap per cell. Mark-recapture data from this season suggest population sizes in study bogs ranged from 2 (+/-0.0 SE) to 16 (+/-3.8 SE) turtles. Detection probabilities were surprisingly high, with an average of 0.01 for each trap. Studies of these known populations allow us to refine a trapping protocol, and we plan to search for new populations in areas the SDM identifies as suitable. A preliminary SDM indicates that several hundred thousand hectares of suitable habitat may exist in the southeastern US, although values ranged broadly depending on threshold selected. The model was made using MaxEnt with environmental variables describing temperature, elevation, land cover, distance to stream, distance to wetland, slope, and aspect, with information about soils to be added. This project will help state wildlife agencies in their efforts to conserve Bog Turtles by identifying key habitat at the landscape scale, and by refining on-theground sampling protocols. More generally, it is a case study that will contribute to designing robust monitoring of rare and cryptic species.
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