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Showing 1 to 20 of 135 for “"crayfish"”.
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Stepping Sequences in the Crayfish
Made available in DSpace on 2014-12-10T18:13:22Z (GMT). No. of bitstreams: 1 6408423.pdf: 1001996 bytes, checksum: 7eee047415d35d46538606e428eadfc2 (MD5) Previous issue date: 1964
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Flow Cytometric Analysis of Crayfish Hemocytes.
<p>Crayfish exhibit innate immune responses via hemocytes and their products. There are 3 hemocyte populations: hyaline cells, granular cells, and semigranular cells. Hemocytes from laboratory housed, untreated crayfish (normal crayfish) have been quantified on the basis of cell type, cell size, …
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Studies of Aggressive Behavior in Crayfish
Made available in DSpace on 2014-12-10T18:13:34Z (GMT). No. of bitstreams: 1 6808155.pdf: 1813323 bytes, checksum: f81b95d6399c93a4c48ef55ec1156091 (MD5) Previous issue date: 1967
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The behavioural function of pheromones in crayfish
… 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 identity of …
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Development of monitoring methods for crayfish populations
… However, such methods are woefully lacking for crayfish. The research of this project involved evaluation of several methods for assessing crayfish populations. The first study (Chapter 2) aims to create standardized, robust sampling methods for assessing stream-dwelling crayfish assemblages and …
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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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Crayfish: Scavenger or deadly predator? Examining a potential predator-prey relationship between crayfish and benthic fish in aquatic food webs
… webs are complex and often poorly understood. Crayfish in particular play a key role in the transfer of energy to higher trophic levels, and can constitute the highest proportion of benthic invertebrate biomass in an aquatic system. Commonly referred to as a keystone species, crayfish are seen …
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Crayfish Predation on Juvenile Freshwater Mussels (Bivalvia: Unionidae)
… to a wide variety of predators, including crayfish. This study examines predation by a native crayfish, Orconectes neglectus on juvenile mussels, Lampsilis siliquoidea. Crayfish preyed on mussels and preferred mussels to snails of similar size. Juvenile mussels buried in substrate were …
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Developmental physiology of the red swamp crayfish Procambarus clarkii
… throughout the development of the red swamp crayfish Procambarus clarkii. Investigations focused on cardiac development and the ontogeny of the regulatory mechanisms of the cardiovascular system. Investigations concentrated on two areas: (1) the development of a staging scheme for P. clarkii, …
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Interbasin Transfer of Invasive Crayfish via Bait-Bucket Dumping
The rusty crayfish (Orconectes rusticus) is a highly invasive and damaging species that has established high population densities in many North American lakes and rivers. Rusty crayfish are native to the Ohio River drainage but have been spreading to surrounding temperate lakes for the last 40+ …
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Effects of reflection and social isolation on crayfish behaviour /
… socialization influence exploratory behaviour in crayfish. The predominant components of spontaneous exploratory behaviour were determined by observing the activity of solitary adult crayfish (Procambarus clarkii) in a glass aquarium containing fresh water and no objects. Five distinct behaviours …
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Effects of Temperature on Synaptic Transmission in Crayfish Muscle
Made available in DSpace on 2014-12-14T13:39:45Z (GMT). No. of bitstreams: 1 7915444.pdf: 5263669 bytes, checksum: b05e25afbdd255017067b8145a67ced3 (MD5) Previous issue date: 1979
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Facilitation At Neuromuscular Junctions in Crayfish Deep Abdominal Extensor Muscles
… investigated in the deep extensor muscles of the crayfish. The posterior branches of the motor nerve to these muscles were stimulated while intracellular recordings were made of the electrical responses of the muscle fibers. The excitatory junction potentials (ejp's) of the muscle fibers of the …
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Crayfish as a biomonitor for the algal toxin microcystin-LR
… methods are incapable of real-time monitoring. Crayfish are resistant to microcystin-LR toxicity and respond well to operant conditioning. I hypothesized that crayfish could sense and be trained to respond to microcystin-LR via electroshocks for use as biomonitors. In the microcystin detection …
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Factors Influencing the Functional Roles of Crayfish in Stream Ecosystems
Results supported an important role for juvenile crayfish in both systems. At Jordan Creek, juveniles were >10 times more abundant than adults during summer and likely accounted for the majority of crayfish effects in the stream. At Shivering Sands Creek, small crayfish greatly reduced the …
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Systematics of the North American Crayfish Genus Orconectes (Decapoda: Cambaridae)
Both molecular and morphological evidence indicated the presence of three species new to science. One of those species is described herein as Orconectes margorectus. Orconectes margorectus occurs in small creeks with rocky substrates and is endemic to the extreme lower Cumberland and Ohio river …
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Thermoregulatory behavior of the crayfish Procambarus clarkii in a burrow environment
The behavioral thermoregulation of the red swamp crayfish, Procambarus clarkii, was investigated and the environmental parameters of crayfish burrows were measured in situ. Although temperatures within burrows fluctuated less than surface temperatures in the Mojave Desert, crayfish can experience …
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THE CRAYFISH VISUAL SYSTEM: INTRACELLULAR STUDIES AND MORPHOLOGIES OF IDENTIFIED INTERNEURONS
… to be made from the optic lobes of the crayfish compound eye. Sustaining fibers (SFs) were impaled with lucifer yellow electrodes near their entrance to the second optic ganglion or Medulla (where the SFs originate). Corneal receptive fields were determined and the SFs identified based …
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The biology of crayfish plague (Aphanomyces Astaci: Schikora) in Great Britain
Aspects of the biology of the crayfish plague fungus (Aphanomyces astaci : Schikora) were studied and a chronology of the spread of crayfish plague in the rivers of Europe was constructed. A study of the spread of crayfish plague in the River Lea and its tributaries indicated a decline in crayfish …
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