Literaturdatenbank
Literaturdatenbank |
|
 |
|
Espenshade, W. H. (2009). Notes on the ecology of southern african tortoises. Unpublished thesis , Villanova University.
Added by: Sarina Wunderlich (18 Nov 2012 17:43:23 UTC) |
| Resource type: Thesis/Dissertation BibTeX citation key: Espenshade2009 View all bibliographic details  |
Categories: General Keywords: Chersina, Chersina angulata, Habitat = habitat, Homopus, Homopus areolatus, Homopus boulengeri, Homopus femoralis, Homopus signatus, Homopus solus, Kinixys, Kinixys belliana, Kinixys natalensis, Kinixys spekii, Psammobates, Psammobates geometricus, Psammobates oculiferus, Psammobates tentorius, Schildkröten = turtles + tortoises, Stigmochelys, Stigmochelys pardalis, Südafrika = Southern Africa, Testudinidae Creators: Espenshade Publisher: Villanova University |
Views: 7/881
Views index: 20% Popularity index: 5% |
| Abstract |
|
Testudinidae A predictive distribution model, GARP, is used to create areas of tortoise coexistence in southern Africa in a raster GIS. Variables determined to be critical are compared to qualitatively assess classical and contemporary interpretations of niche. The method of determining critical variables is tested along a gradient of predictive values. Predictions made from a greater delineation of variables tend to support classical niche definitions while predictions made from truncated variables tend to support contemporary interpretations of niche. Life history traits of tortoises confound results for either niche definition as tested with this study. Predictive maps are shown with a layer depicting traditional quarter degree grid locations. Of seven areas predicted to have high coexistence, one is well protected in Kruger National Park, two are in relatively undisturbed and unprotected areas, two may be lost to anthropogenic disturbance, and three have a mixed opportunity for conservation. Homopus solus Chersina angulata Stigmochelys pardalis Psammobates geometricus Psammobates tentorius Psammobates oculiferus Homopus signatus Homopus areolatus Homopus femoralis Homopus boulengeri Kinixys belliana Kinixys belliana Kinixys spekii Kinixys natalensis
Added by: Sarina Wunderlich |