The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform
Alexandra Marcal Correia - One of the best experts on this subject based on the ideXlab platform.
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seasonal and interspecific evaluation of predation by mammals and birds on the introduced red swamp crayfish Procambarus clarkii crustacea cambaridae in a freshwater marsh portugal
Journal of Zoology, 2006Co-Authors: Alexandra Marcal CorreiaAbstract:The crayfish Procambarus clarkii is an introduced species in Portugal, becoming a new available resource that has possibly changed local trophic relationships. The purpose of the present study was to understand better how a naive assembly of predators reacted to a recent invader. Predation on P. clarkii by nine species of mammals (Order: Carnivora) and six species of birds (Order: Ciconiiformes) in a marsh area in Portugal, was surveyed through the collection of faeces and pellets over a 24-month period. Seasonal variation in the consumption of this prey by different predators was evaluated, and estimation made of size and weight of P. clarkii consumed by them. Procambarus clarkii was readily preyed upon by four species of mammalian carnivores and five species of ciconiiform birds. The consumption of P. clarkii varied seasonally in both years with a trend between seasonal exploitation and its population structure and availability. Generally, the use of P. clarkii by all predators was more intense in spring, summer and autumn than in winter, and was directed towards larger and heavier individuals. These findings result from the population dynamics presented by P. clarkii in the marsh area studied here, since larger and heavier individuals were more available in spring, summer and autumn. Procambarus clarkii is an important food resource for mammals and birds and it seems to play a key role in the trophic interactions of the riparian and terrestrial communities of the marsh.
S. C. Edwards - One of the best experts on this subject based on the ideXlab platform.
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Changes in prostaglandin E_2 and F_2α during vitellogenesis in the florida crayfish Procambarus paeninsulanus
Journal of Comparative Physiology B, 1993Co-Authors: E. P. Spaziani, Gertrude W. Hinsch, S. C. EdwardsAbstract:While the role of eicosanoids in reproduction in vertebrate species has been well established, the role of these fatty acid derivatives in invertebrate species has not been as well characterized. The purpose of this study was to investigate changes in prostaglandins E_2 and F_2α during vitellogenesis in the crayfish Procambarus paeninsulanus . In homogenates of crayfish ovaries taken at various stages of development, the rate of prostaglandin synthesis and the concentrations of prostaglandins E_2 and F_2α increased during the final stages of yolk production just prior to ovulation. A gradual increase in prostaglandin E_2 amounts was observed throughout the progression of vitellogenesis. The data suggests the possible involvement of prostaglandins in regulatory events associated with vitellogenesis and the induction of ovulation in Procambarus paeninsulanus .
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Changes in prostaglandin E2 and F2 alpha during vitellogenesis in the Florida crayfish Procambarus paeninsulanus.
Journal of comparative physiology. B Biochemical systemic and environmental physiology, 1993Co-Authors: E. P. Spaziani, Gertrude W. Hinsch, S. C. EdwardsAbstract:While the role of eicosanoids in reproduction in vertebrate species has been well established, the role of these fatty acid derivatives in invertebrate species has not been as well characterized. The purpose of this study was to investigate changes in prostaglandins E2 and F2 alpha during vitellogenesis in the crayfish Procambarus paeninsulanus. In homogenates of crayfish ovaries taken at various stages of development, the rate of prostaglandin synthesis and the concentrations of prostaglandins E2 and F2 alpha increased during the final stages of yolk production just prior to ovulation. A gradual increase in prostaglandin E2 amounts was observed throughout the progression of vitellogenesis. The data suggests the possible involvement of prostaglandins in regulatory events associated with vitellogenesis and the induction of ovulation in Procambarus paeninsulanus.
M. Falaschi - One of the best experts on this subject based on the ideXlab platform.
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Thirty years of invasion: the distribution of the invasive crayfish Procambarus clarkii in Italy
'UC Merced School of Natural Sciences', 2020Co-Authors: Lo E. Parrino, G.f. Ficetola, R. Manenti, M. FalaschiAbstract:The presence of the red swamp crayfish Procambarus clarkii in Italy is documented since 1989, but no comprehensive data are available on its spread through time at the national scale. New confirmed records for Procambarus clarkii are continuously arising in recent years across the country. By reviewing the scientific and grey literature, we obtained an up-to-date map of the species invasion in Italy. This information can help to monitor and understand the spread of this highly invasive crayfish and to implement more effective management measures
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Thirty years of invasion: the distribution of the invasive crayfish Procambarus clarkii in Italy
Biogeographia – The Journal of Integrative Biogeography, 2019Co-Authors: Elia Lo Parrino, G.f. Ficetola, R. Manenti, M. FalaschiAbstract:Author(s): Lo Parrino, Elia; Ficetola, Gentile Francesco; Manenti, Raoul; Falaschi, Mattia | Abstract: The presence of the red swamp crayfish Procambarus clarkii in Italy is documented since 1989, but no comprehensive data are available on its spread through time at the national scale. New confirmed records for Procambarus clarkii are continuously arising in recent years across the country. By reviewing the scientific and grey literature, we obtained an up-to-date map of the species invasion in Italy. This information can help to monitor and understand the spread of this highly invasive crayfish and to implement more effective management measures.
Jay V. Huner - One of the best experts on this subject based on the ideXlab platform.
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Occurrence of the enigmatic, unicellular Psorospermium organism in several cultured, sympatric populations of the freshwater crayfishes Procambarus clarkii and Procambarus zonangulus.
Journal of the World Aquaculture Society, 2000Co-Authors: David P. Klarberg, Paula Henttonen, Jay V. HunerAbstract:The parasitic Psorospermium organism was studied in cultured sympatric populations of mature Procambarus clarkii and Procambarus zonangulus during four consecutive annual crayfish seasons from 1991–1992 through 1994–1995. Most P. clarkii were infected while fewer than half of the P. zonangulus were infected throughout the study period. The numbers of Psorospermium were four to eight times greater in P. clarkii and showed annual changes not seen in P. zonangulus. Both crayfishes demonstrate 1yr life cycles in Louisiana and this seemed to explain the variations seen in Psorospermium dynamics in the two hosts. In general, there was no consistent association between crayfish size and the number of parasites found in them for either crayfish species. There was some indication of an association between the presence of infection and the number of parasites found in P. zonangulus.
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Physiological Adaptations of Freshwater Crayfishes that Permit Successful Aquacultural Enterprises
American Zoologist, 1995Co-Authors: Jay V. Huner, Ossi V. LlndqvistAbstract:Synopsis. There are over 400 species and three families of freshwater crayfishes. Many species are collected for food and/or fish bait but fewer than ten are commercially cultivated. We discuss the physiological adap? tations that permit these species to be successfully cultivated. The most important cultured species include: Northern Hemisphere?Cambaridae?Orconectes immunis, Procambarus clarkii, and Procambarus zonangulus, and Southern Hemisphere?Parastacidae?C/zerax destructor. Procambarus clarkii is, by far, the most important species and has been successfully introduced to all continents, save Antarctica and Australia, from its native North America. All species may be cultivated entirely in closed, intensive systems; however, economics are such that they are commercially produced, for the most part, by establishing perpetuating populations in earthen pond systems. All species tolerate low oxygen, adapt well to aerial exposure, and persist for extended periods in burrow systems in the absence of surface waters. The cultured species have high fecundities, rapid growth rates, and mature quickly. Aquaculture of fresh? water crayfish is in its infancy. Therefore, it is likely that additional species with favorable adaptations discussed here will be identified for cultural purposes.
E. P. Spaziani - One of the best experts on this subject based on the ideXlab platform.
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Changes in prostaglandin E_2 and F_2α during vitellogenesis in the florida crayfish Procambarus paeninsulanus
Journal of Comparative Physiology B, 1993Co-Authors: E. P. Spaziani, Gertrude W. Hinsch, S. C. EdwardsAbstract:While the role of eicosanoids in reproduction in vertebrate species has been well established, the role of these fatty acid derivatives in invertebrate species has not been as well characterized. The purpose of this study was to investigate changes in prostaglandins E_2 and F_2α during vitellogenesis in the crayfish Procambarus paeninsulanus . In homogenates of crayfish ovaries taken at various stages of development, the rate of prostaglandin synthesis and the concentrations of prostaglandins E_2 and F_2α increased during the final stages of yolk production just prior to ovulation. A gradual increase in prostaglandin E_2 amounts was observed throughout the progression of vitellogenesis. The data suggests the possible involvement of prostaglandins in regulatory events associated with vitellogenesis and the induction of ovulation in Procambarus paeninsulanus .
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Changes in prostaglandin E2 and F2 alpha during vitellogenesis in the Florida crayfish Procambarus paeninsulanus.
Journal of comparative physiology. B Biochemical systemic and environmental physiology, 1993Co-Authors: E. P. Spaziani, Gertrude W. Hinsch, S. C. EdwardsAbstract:While the role of eicosanoids in reproduction in vertebrate species has been well established, the role of these fatty acid derivatives in invertebrate species has not been as well characterized. The purpose of this study was to investigate changes in prostaglandins E2 and F2 alpha during vitellogenesis in the crayfish Procambarus paeninsulanus. In homogenates of crayfish ovaries taken at various stages of development, the rate of prostaglandin synthesis and the concentrations of prostaglandins E2 and F2 alpha increased during the final stages of yolk production just prior to ovulation. A gradual increase in prostaglandin E2 amounts was observed throughout the progression of vitellogenesis. The data suggests the possible involvement of prostaglandins in regulatory events associated with vitellogenesis and the induction of ovulation in Procambarus paeninsulanus.
