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Showing 1 to 9 of 9 for “"Perna perna"”.
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Population structure and recruitment patterns of the indigenous Mussel Perna perna and the Alien Mussel Mytilus galloprovincialis on the central coast of Namibia
… index and abundance of the indigenous mussel Perna perna and alien mussel M. galloprovincialis at three different sites on the central Namibian coast. Sampling took place during spring tide, once every season along Dolphin Beach, Long Beach, and Shipwreck, near Swakopmund during 2014. At …
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Relation of crystalline style function to food availability and environmental conditions in South African mussels
… meridionalis, Mytilus galloprovincialis, Perna perna and Aulacomya ater are important and often dominant organisms on the littoral and sublittoral shores of the South Africa. M. galloprovincialis has only recently been identified as a separate species, but a cons1derable body of …
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Selected molluscs as monitors of metal pollution in coastal marine environments
… Crassostrea gigas, Crassostrea margaritacea, Perna perna and Choromytilus meridionalis. Metal concentrations in these and other species living along an unpolluted coast have been determined by atomic absorption spectrometry following chemical oxidation of the biological tissues. Variations in …
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Shellfish utilization and its effect on rocky shore biota in Transkei
… effects of limitation are most obvious in the Perna-coralline algal turf zone, where the exploitation pressure is also the greatest. Perna perna communities in particular are affected. Exploited sites maintain young populations of P. perna with an average size of less than 4crn (Means of …
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Aspects of pollution in False Bay, South Africa (with special reference to subtidal pollution)
… meridionalis, Mytilus galloprovincialis and Perna perna using alum and ferric sludge indicate that there are no significant short-term sub-lethal toxic effects on the rocky shore bivalves and that decreased salinities in the immediate region of the outfall (as a result of the freshwater …
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Aspects of stress with particular reference to mytilid mussels and their parasites
… of Aulacomya ater, Choromytilus meridiana/is, Perna perna and Mytilus galloprovincialis. Metacercaria notobucephala sp. nov., a bucephalid from Choromytilus has locality-specific prevalences ranging from 0.23% to 4.46%. It is a severe reproductive stress and reduces the sperm count by a factor …
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Biomonitoramento e ecotoxicologia de metais pesados através de moluscos bivalves em ecossistemas estuarinos
… ostras do gênero Crassostrea e mexilhões como Perna perna e Mytilus edulis são empregados com maior frequência. Bivalves são organismos filtradores e possuem a capacidade de acumular em seus tecidos substâncias e microrganismos presentes na água. Desta forma, foi biomonitorada a poluição de …
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Comparative ecology and physiology of four South African mussel species with notes on culture potential
… meridionalis, Mytilus galloprovincialis and Perna perna. The first chapter is a preliminary account of the introduction of the invasive M. galloprovincialis, and its ecological effects. Its rate of invasion is estimated by monitoring changes in the diet of oystercatchers, as well as comparing …
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Historical changes on rocky shores in the Western Cape, as revealed by repeat photography
… the range contraction of the warmer-water mussel Perna perna. Evidence suggests that a changing climate is the major driver of both of these changes. No change in zonation due to changing sea levels was observed. However, the range contraction of P. perna is complicated by the introduction of an …