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 8 of 8 for “"Freshwater crayfish"”.
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INVASION DYNAMICS OF FRESHWATER CRAYFISH IN A MAN-DOMINATED LAND: SPATIO-TEMPORAL, ECOLOGICAL AND HUMAN DIMENSIONS
… invasions are among the leading threats to freshwater biodiversity, yet predicting their dynamics and mitigating their impacts remains challenging, especially in human-dominated landscapes where human-aided dispersal is highly possible. This thesis in particular advances understanding of …
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A study of aspects of the biology and distribution of freshwater crayfish in the Thames catchment
… examination of the biology and distribution of freshwater crayfish in the Thames Catchment. Studies of the distribution of both the native (Austropotamobius pallipes. Lereb.), and an introduced (Pace as acus leniusculus. Dana.) species have been undertaken and attempts to evaluate some of the …
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The Effect of Divalent Cations on the Prophenoloxidase Enzyme Cascade Activity in the Freshwater Crayfish Cambarus Latimanus
… system (proPO) was studied in hemocytes of the crayfish Cambarus latimanus. It was demonstrated that cadmium, calcium, copper and lead increased proPO activity significantly, whereas magnesium had no statistically significant effect on the system. Also, the molecular weight of the proPO enzyme …
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Effects of native forest and pastoral land use on the population dynamics and trophic role of the New Zealand freshwater crayfish Paranephrops planifrons (Parastacidae)
… streams, but the impact of land use change on crayfish populations is unknown. The population dynamics, growth, and diet of crayfish in Waikato pastoral streams were compared to crayfish inhabiting native forest streams to determine whether conversion to pasture has adversely affected crayfish …
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Kōura (Paranephrops planifrons) populations in the Te Arawa lakes: An ecological assessment using the traditional Māori tau kōura harvesting method and recommendations for sustainable management
Freshwater crayfish are amongst the most influential of biota in many aquatic systems. They have various ecological functions, acting as shredders, detritivores and predators which in turn influence other macroinvertebrate fauna. Furthermore, freshwater crayfish are increasingly used as indicator …
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The sustainability of crayfish harvesting in Madagascar
Madagascar’s freshwater crayfish, belonging to the endemic genus Astacoides, are harvested throughout their range in the eastern highlands of the country. They provide an important source of protein and revenue to local communities but there is concern that the harvest may be unsustainable. In this …
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The behavioural function of pheromones in crayfish
… and Procambarus clarkii are highly invasive freshwater crayfish and are having detrimental impacts on native species and habitats throughout Europe. The application of pheromone baits have been proposed as a way of increasing trap efficiency for population control, however the chemical …
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Investigation of the replacement of Margaret River hairy marron Cherax tenuimanus (Smith) by smooth marron C. cainii Austin
… both of which are attributes known to influence freshwater crayfish replacement elsewhere in the world. A conceptual flowchart based on interacting intrinsic and extrinsic factors that influence the replacement of C. tenuimanus by C. cainii was constructed. This flowchart provides guidance in …