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A tidal rhythm in the Gulf of California hermit crab, Clibanarius digueti (Bouvier)Snyder, Elaine Kay, 1948- January 1972 (has links)
No description available.
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The impact of foraging by soldier crabs, Mictyris brevidactylus, on sandy shore communitiesLee, Ka-wai, 李嘉慧 January 2007 (has links)
published_or_final_version / abstract / Biological Sciences / Doctoral / Doctor of Philosophy
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Functional aspects of behavior and morphology in the decorator crab Microphrys Bicornutus (Latreille, 1825) (Crustacea: Brachyura: Mithracidae)Unknown Date (has links)
Masking or decorator crabs, conceal themselves partially through camouflage, by
selecting or indiscriminately attaching materials from their environment to their
exoskeleton. Functional aspects of decorating behavior and morphology in this group
have not been documented. Using Microphrys bicornutus as a model species, this
dissertation demonstrates clearly that decorating is an advantageous phenotype that has
evolved to serve several functions. Decorating is a complex behavior that begins when a crab approaches an algal substrate and results in the attachment of algae to hooked setae on the exoskeleton. Once decorated, crabs remain motionless on the substrate until disturbed or until another behavior is initiated. This was confirmed for M. bicornutus, as crabs spent a significant
amount of time feeding, remaining motionless, picking, and walking when compared to
decorating. Crabs displayed agonistic behaviors during encounters with conspecifics conspecifics. These included both active aggressive behavior and display behavior.
Crabs showed a decrease in motility during these encounters, helping maintain dispersed
distributions, thereby decreasing intrsapecific encounters in the field. Trials were done to determine the effect of conspecifics, predators and feeding preferences on algal utilization. M. bicornutus showed a significant decrease in the amount of algae used for decoration in the highest density trials (i.e., 4 and 8 crabs). Agonistic displays and aggressive behavior between these crabs likely affected the time available for decorating. Decorated crabs isolated from an algal substrate were more likely to survive in the presence of either of two sympatric fish predators. Thus, being protected by the algal decoration on their exoskeletons. Trials also showed a parallel between algal consumption and algal materials used for decoration. In addition to its protective function, algae used by M. bicornutus for decoration simultaneously serve as
short term food supplies for the crabs. Eleven morphologically complex structures were identified and mapped on the exoskeleton. Hooked setae were the primary structures used to attach algae to the crab’s body. Ten additional setal structures were present, including two novel types of setae. On the basis of location and morphological variation exhibited among these latter structures, a primary sensory function may be inferred. / Includes bibliography. / Dissertation (Ph.D.)--Florida Atlantic University, 2013.
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A Novel Interaction: The thin stripe hermit Crab, Clibanarius vittatus, kills the Florida crown conch, Melongena corona, for its shellUnknown Date (has links)
The hermit crab Clibanarius vittatus kills Melongena corona solely to
acquire a better fitting shell. This finding is contrary to previous studies, which
found that hermit crabs of other species cannot kill gastropods or, in most
instances, remove freshly dead gastropods from their shells. This interaction
cannot be classified as predation because Melongena tissue was never
consumed. Clibanarius killed Melongena only when by doing so they could trade
up to a better fitting shell. It cannot be classified as competition because there is
no opportunity for Melongena to gain from the interaction. Therefore the term
“lethal eviction” is hereby proposed for this interaction. The ability to kill a
gastropod to obtain a superior shell gives Clibanarius vittatus an evolutionary
advantage over other hermit crab species. It is not known if the outcome of this
interaction is widespread where both species occur or if it is confined to the
study area. / Includes bibliography. / Thesis (M.S.)--Florida Atlantic University, 2017. / FAU Electronic Theses and Dissertations Collection
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Predation on an introduced marine snail by native crabsBaker, Patrick January 1988 (has links)
Typescript.
Includes vita and abstract.
Bibliography: Includes bibliographical references (leaves 55-58). / Ceratostoma ioornatum is an introduced marine snail in Puget Sound,
Washington. Two of five native species tested as possible predators ate
Ceratostoma. These two species, the crabs Cancer gracilis and
Lopbppaoopeys bellys, did not eat native snails similar to Ceratpstpma,
but ate native and introduced bivalves more than Ceratpstpma. The
reasons for the differences in predation seemed to be explained by shell
strength of the prey species. The presence of Ceratpstpma adds a new
type of prey to the menu of the two crab species
at the sites studied.
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