Literaturdatenbank
Literaturdatenbank |
|
 |
|
Wallace, J. E., Fratto, Z. W., & Barko, V. A. , An evaluation of the turtle assemblage and sampling methodology of donaldson point conservation area, missouri. Paper presented at Turtle Survival Alliance 2006 Annual Meeting.
Added by: Admin (13 Dec 2008 22:23:58 UTC) Last edited by: Beate Pfau (16 Aug 2009 08:07:54 UTC) |
| Resource type: Proceedings Article BibTeX citation key: Wallace2006 View all bibliographic details  |
Categories: General Keywords: Apalone, Apalone mutica, Apalone spinifera, Chelydra, Chelydra serpentina, Chelydridae, Emydidae, Graptemys, Graptemys geographica, Graptemys ouachitensis, Graptemys pseudogeographica, Habitat = habitat, Kinosternidae, Nordamerika = North America, Schildkröten = turtles + tortoises, Sternotherus, Sternotherus odoratus, Trachemys, Trachemys scripta, Trionychidae Creators: Barko, Fratto, Wallace Collection: Turtle Survival Alliance 2006 Annual Meeting |
Views: 7/693
Views index: 12% Popularity index: 3% |
| Abstract |
|
This study investigated aquatic assemblages and sampling methodology in Donaldson Point Conservation Area (DPCA). DPCA is a lentic area within the Mississippi River floodplain that experiences seasonal flooding. Areas such as these are very productive (Megonigal et al., 1997) and are critical freshwater turtle habitats in a big river system (Wigley and Lancia, 1998; Bodie, 2000). Sampling was performed during the fall (October-November 2003) and the spring (April-May 2004). A total of nine sites were randomly sampled using fyke nets, hoop nets and basking traps. Sites were classified as either round or linear depending on their shape. Hoop nets were deployed with and without the use of leads, whereas fyke nets were ran with leads tied together or ran perpendicularly to the bank. The performance of each net and the assemblages of turtle species caught were evaluated. Turtle species caught were Trachemys scripta elegans (n=464), Graptemys pseudogeographica pseudogeographica (n=201), Apalone mutica mutica (n=1), Apalone spinifera spinifera (n=7), Sternotherus odoratus (n=17), Graptemys pseudogeographica ouachitensis (n=1) and Chelydra serpentina serpentina (n=23). This study found that the CPUEs within hoop nets and fyke nets were considerably greater in the fall than in the spring, with seasonal flooding and habitat usage being likely factors. Fyke nets ran perpendicularly to the bank proved to be the most successful. Water quality variables also had influences on turtle assemblages. Deeper water and low transparency increased species richness, whereas high dissolved oxygen and the deployment of hoop nets lowered richness. Abundance was the least when hoop nets were deployed, in linear water bodies and high turbidity in conjunction with lower pH and dissolved oxygen. Turtle species are a critical component in any wetland system. Flood plain habitats such as those found within DPCA are of great importance due to their productivity and interaction within a big river system.
Added by: Admin Last edited by: Beate Pfau |