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Moore, D. C. , A tail of two turtles - river management and imperiled turtle species in the western usa. Unpublished paper presented at 6th World Congress of Herpetology. 
Added by: Admin (21 Nov 2009 12:00:01 UTC)
Resource type: Conference Paper
BibTeX citation key: Moore2008a
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Categories: General
Keywords: Apalone, Apalone spinifera, Emydidae, Habitat = habitat, Nordamerika = North America, Schildkröten = turtles + tortoises, Trachemys, Trachemys gaigeae, Trionychidae
Creators: Moore
Collection: 6th World Congress of Herpetology
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Abstract     
Aquatic herpetofauna, because of their reliance on water for major portions of their life cycles, can be very susceptible to alterations in magnitude and timing of river flows. Sampling and radio-telemetry studies were conducted by the U.S. Bureau of Reclamation in an effort to assess management impacts on imperiled turtle species in two highly managed river systems of the western United States. The Spiny Softshell (Apalone spinifera) and Big Bend Slider (Trachemys gaigeae) exist in fragmented, little-known populations in the Upper Missouri River and Rio Grande, respectively. During 2006, turtle sampling via hoop nets was conducted to document relative abundance of species within the study areas. During 2007, individuals were fitted with radio transmitters and will be tracked through 2008 to determine seasonal and annual movements and habitat requirements. Radio-tagged T. gaigeae remained in a complex willow (Salix spp.) and cattail (Typha spp.) marsh adjacent to the Rio Grande for the duration of the study. Individuals moved very little on a seasonal and annual basis. These marsh habitats are very limited within the Rio Grande Basin, which could explain the fragmentation of populations of this species. Conversely, A. spinifera moved freely throughout the Missouri River during the study. Some individuals moved more than 30 km up or downstream. It is unclear whether these movements are directed migrations or simply haphazard wanderings. Meaningful data gathered during these studies include transmitter attachment improvements, species distribution and abundance, habitat requirements and movement data. These data will be used to make management recommendations to prevent further declines of these species.
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