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 9 of 9 for “"Hermit crabs"”.
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Deep water parapagurid hermit crabs: their distribution, abundance, population structure and associations in the Southern Benguela
… %). Questions are raised about whether these hermits exist along an evolutionary continuum of traditional shell reliance, whereby the species utilise their pseudoshells differently - P. bouvieri appears to show a stronger mutualistic symbiosis with its exclusive pseudoshell species than S. …
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Contributions to the taxonomy of South African hermit crabs (Crustacea: Decapoda: Paguroidea) – integrating microCT scanning and barcoding
Hermit crabs form an important component of the marine benthos and globally more than 1,200 species have been described. In the unique bioregion of South Africa, hermit crabs are poorly known, and the last taxonomic revision of the group was that of K. H. Barnard in 1950, who recorded only 32 …
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Behavioral Evidence for "Contextual Decision Hierarchies" In the Hermit Crab, Pagurus samuelis
… perception influence the behavioral choices of hermit crabs. I began by reviewing behavioral experiments that have demonstrated the underlying sensory processing of visual, chemical, and tactile information in crustaceans and propose a novel behavior model entitled "Contextual Decision …
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Sexual Dimorphism and Behavioral Responses to Conspecific Chemical Cues in Pagurus samuelis
… the major cheliped and carapace lengths of hermit crabs caught off the coast of Southern California and found that male chelipeds were significantly larger relative to their carapace length than female chelipeds. Average male cheliped:carapace ratios were 1.86 while average female …
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Revisión taxonómica de las especies ibéricas de cangrejos ermitaños (DECAPODA: ANOMURA: PAGUROIDEA) y sus relaciones filogenéticas
Traditionally, the study of hermit crabs has been based on the description and comparison of morphological characters that are sometimes difficult to assess, which in many cases has led to difficulties in clearly delimiting species. The morphological complexity of the group (where practically all …
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Effects of anthropogenic change on animal cognition and emotion
… pollution. Microplastic exposure prevented hermit crabs from approaching and entering a new shell, which was better than their current shell. These results suggest that microplastics disrupt animal cognition (resource assessment and evaluation). Finally, I apply emotion theory to animal …
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The fate and impacts of microplastics in marine systems
… the mechanisms in which marine animals such as hermit crabs compete for resources. The data and results presented in this thesis provides valuable information on the accumulation of microplastics globally, and their effects on ecosystem functionality and key survival behaviours. Given that …
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Dedicated dads: a study on the nesting behaviour of Spondyliosoma emarginatum (Telostei: Sparidae)
… of invertebrate invaders (brittle stars, hermit crabs, sea cucumbers, and sea stars), and chasing away other fish species (sand gobies, Roman, and hottentot) and neighbouring male steentjies. Energy intensive behaviours such as clearing the nest and fanning the eggs remained constant …
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Studies on the biology of the Indo-Pacific sandy shore crab, Matuta lunaris Forskål (Brachyura: Calappidae)
… and large individuals primarily feeding on hermit crabs, gastropods and bivalves. The reproductive biology was investigated using gonad indices, histological analysis of the gonads and field and laboratory observations of sexually mature individuals. Reproductive activity in terms of gamete …