Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 6 of 6 for “"freshwater crabs"”.
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Phylogenetic studies of the Madagascan freshwater crabs (Potamoidea, Potamonautidae, Deckeniinae)
<p>Relationships within the Madagascan freshwater crab fauna were examined based on unstudied specimens from all parts of Madagascar. This study allowed the examination of the validity of existing genera and species, and identified potential new taxa. The new specimens provided phylogenetic and …
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Hidden Diversity of Madagascan Freshwater Crabs (Brachyura: Potamoidea) Revealed by Morphological and Molecular Studies
<p>This study focuses on the freshwater crab fauna of the island of Madagascar. Relatively little is known about the species diversity of the island’s freshwater crabs and their phylogenetic relationships. Chapter 1 is based on a newly published molecular phylogeny that used the highest taxonomic …
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Reassessment of the extinction risk of the Neotropical freshwater crabs of the family Pseudothelphusidae
… of the world’s biodiversity hotspots, and its freshwater crabs are notably diverse, and are represented by two families, Pseudothelphusidae and Trichodactylidae. This study focuses on this region’s highly diverse Pseudothelphusidae which includes 48 genera and 289 species. The 2008 IUCN global …
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EVOLUTION OF FRESHWATER CRABS IN LAKE MALAWI AND THE LAKE MALAWI BASIN IN THE EAST AFRICAN RIFT VALLEY
… Rift Valley and is home to a single species of freshwater crab, the Malawi Blue Crab. Little is known about species diversity and the phylogenetic relationships of the freshwater crabs of Lake Malawi, in contrast to the lake’s highly-diverse cichlid fish species flocks. The Malawi Blue Crab is …
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Assessment of heavy metal concentrations in water and sediment of dams in Central Namibia and bioaccumulation of copper in locally occuring crabs and fish
… canal. An exposure study using Tilapia fish and freshwater crabs were done to determine at what concentrations and in which parts of the body bioaccumulation takes place. Organisms were exposed to different Copper concentrations (0, 20, 40 and 80 mg/L) for 8 weeks. Concentration of Cu in the …
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Conservation ecology of the Cape clawless otter, Aonyx capensis, in an urban environment
Coastal cities have impacted negatively on freshwater and marine ecosystems - primarily through habitat loss, fragmentation and pollution. Globally, it has been found that otter's dependence on these ecosystems exposes them to a myriad of threats, including loss of habitat, human-wildlife conflict …