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Showing 1 to 20 of 121 for “"crabs"”.
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A Cast of White Crabs
<p>N/A</p>
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Modeling central pattern generators in sand crabs
Ordinary differential equation models based on those of Hodgkin and Huxley are presented in an effort to describe a part icular anomalous digging behaviour in t he anomuran decapod crust acean Emerita analoga. At the onset of a dig, the fourth (hindmost) right and left legs stroke together about …
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Effects of Temperature on Growth and Molting in Blue Crabs (Callinectes Sapidus) and Lesser Blue Crabs (<i>Callinectes similis</i>)
… molt (GPM) in many crustaceans, including blue crabs. Field surveys suggest that blue crabs reach maturity at larger sizes in cooler areas, and at smaller sizes in warm areas. In this study I investigate the effect of temperature on the growth process in blue crabs <em>Callinectes sapidus</em> …
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Correlating Behavior and Physiology of Sand Fiddler Crabs, UCA Pugilator
… hepatopancreas. Results suggest the majority of crabs were bold in the context of hiding time yet shy in the exploration context. This context-specific behavior was not explained by physiology. Our results suggest that flexible expression of personality traits may occur in the absence of an …
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Phylogenetic studies of the Madagascan freshwater crabs (Potamoidea, Potamonautidae, Deckeniinae)
… new localities, establish that freshwater crabs are found throughout all six provinces, and in all five ecoregions on the island. This includes new records from Mahajanga and Toliara Provinces. Improved taxonomic sampling for this study supports the validity of the current taxonomic …
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CRABS & ‘CROBES: THE TRIPARTITE RELATIONSHIP OF A HOST, PARASITE, AND THEIR RESPECTIVE MICROBIOMES
… different from the microbiomes of the crabs. Microbiomes of infected versus uninfected crabs were also significantly different. Both adult parasite externae and parasite larvae were found to have bacteria including Pseudoalteromonas species, which provide natural antimicrobial defenses, …
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Selection of Spawning Habitats by Horseshoe Crabs (Limulus polyphemus) along the Complex Connecticut Coast
… on the Long Island Sound population of horseshoe crabs and aimed to characterize the coastal habitats of Connecticut by various traits using remote sensing and geographic information system technologies. Data layers representing the coastal area were created within which slope, wave exposure, …
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Abundance and Distribution of Early Life Stage Blue Crabs (Callinectes sapidus) in Lake Pontchartrain
… in the abundance of early life stage blue crabs (Callinectes sapidus). Collections were made using a 1 m2 throw trap and data showed that C. sapidus numbers varied over time and among sites. Two recruitment events occurred during the study. During the first recruitment in May-June, C. …
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Impacts of the introduced crabs, Carcinus maenas and Hemigrapsus sanguineus, in northern New England
<p>Two introduced crab species are presently found in northern New England, Carcinus maenas, which has been in this region for over 100 years, and Hemigrapsus sanguineus which was first reported in New Hampshire in 1998. Carcinus maenas is a generalized predator and its introduction has had …
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Hidden Diversity of Madagascan Freshwater Crabs (Brachyura: Potamoidea) Revealed by Morphological and Molecular Studies
… 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 sampling to date, including almost all of the island’s known freshwater crab genera and species. The phylogeny …
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Reassessment of the extinction risk of the Neotropical freshwater crabs of the family Pseudothelphusidae
… 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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Physiological and Behavioral Studies of Color Vision in Fiddler Crabs (Brachyura, Ocypodidae, Genus Uca)
Made available in DSpace on 2014-12-12T01:27:44Z (GMT). No. of bitstreams: 1 7405600.pdf: 3056319 bytes, checksum: 8a4e7e22f315901387e2c24c56f5c971 (MD5) Previous issue date: 1973
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The population ecology and feeding biology of rocky shore crabs on the Cape Peninsula
… ecology and feeding biology of rocky-shore crabs on the Cape Peninsula. The biology of three crabs is examined, namely, the ubiquitous brown shore-crab Cyclograpsus punctatus (M.Edw), the Cape rock-crab Plagusia chabrus (De Haan) and the invasive European shore-crab Carcinus maenas (L.). The …
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Reducing post-bleeding mortality of horseshoe crabs (Limulus polyphemus) used in the biomedical industry
… of blood extraction on the survival of horseshoe crabs and performed a preliminary investigation into amebocyte maintenance in vitro. Hemolymph volume of L. polyphemus was estimated over a representative size range of adults. Hemolymph volume expressed as a percentage of wet body weight was 25 ± …
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The Ecology and Evolution of Social Behavior in The Crabs Sesarma Reticulatum and S. Cinereum
Made available in DSpace on 2014-12-14T16:11:20Z (GMT). No. of bitstreams: 1 8009167.pdf: 4770090 bytes, checksum: da1ea986840cbcc0c004b7c947a6bdc2 (MD5) Previous issue date: 1979
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Quantifying Discard Mortality of Undersized and Ovigerous Crabs in the Gulf of Mexico Blue Crab Fishery
<p>Blue crabs support a valuable commercial fishery in the Gulf of Mexico. Most states require the release of undersized and ovigerous blue crabs, yet mortality of these discarded crabs is an understudied component of total mortality. The first objective of this project was to quantify discard …
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Neuroanatomical and Neurophysiological Aspects of Vibrational Processing in the Central Nervous System of Semi-Terrestrial Crabs
Fiddler crabs (Uca) use substrate-borne vibrational signals during social interactions. The aims of this study were to determine (1) the central representation of vibrational stimuli in fiddler crabs, and (2) the generality of these findings as they relate to analogous systems in other arthropods.
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