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Articles 1 - 4 of 4
Full-Text Articles in Environmental Health
Extinction Risk And Bottlenecks In The Conservation Of Charismatic Marine Species, Loren Mcclenachan, Andrew B. Cooper, Kent E. Carpenter, Nicholas K. Dulvy
Extinction Risk And Bottlenecks In The Conservation Of Charismatic Marine Species, Loren Mcclenachan, Andrew B. Cooper, Kent E. Carpenter, Nicholas K. Dulvy
Biological Sciences Faculty Publications
The oceans face a biodiversity crisis, but the degree and scale of extinction risk remains poorly characterized. Charismatic species are most likely to gar- ner greatest support for conservation and thus provide a best-case scenario of the status of marine biodiversity. We summarize extinction risk and diagnose impediments to successful conservation for 1,568 species in 16 families of marine animals in the movie Finding Nemo. Sixteen percent (12–34%) of those that have been evaluated are threatened, ranging from 9% (7–28%) of bony fishes to 100% (83–100%) of marine turtles. A lack of scientific knowledge impedes analysis of threat status …
Pfiesteria Piscicida And Dinoflagellates Similar To Pfiesteria, Harold G. Marshall
Pfiesteria Piscicida And Dinoflagellates Similar To Pfiesteria, Harold G. Marshall
Virginia Journal of Science
Pfiesteria pisiccida is a microscopic, unicellular organism that is classified as both a mixotrophic and heterotrophic dinoflagellate, which has been associated with both fish deaths and a cause of human illness (Burkholder et al., 1992; Glasgow et al., 1995; Burkholder and Glasgow, 1997). This species possesses a complex life cycle that includes motile forms (e.g. zoospores, gametes, amoebae) and a cyst stage that may remain dormant in the sediment (Burkholder et al., 1995b). Pfiesteria piscicida is known to have toxin and non-toxin producing populations, where cyst transformation into the toxic motile zoospores may be initiated by the presence of certain …
Water Quality Relationships To Concentrations Of Pfiesteria-Like Organisms In Virginia Estuaries For 1998, Everett P. Weber, Harold G. Marshall
Water Quality Relationships To Concentrations Of Pfiesteria-Like Organisms In Virginia Estuaries For 1998, Everett P. Weber, Harold G. Marshall
Virginia Journal of Science
A series of statistical analyses were performed to identify the relationship between abundance of dinoflagellates grouped as Pfiesteria-like organisms and a set of 25 water quality variables from May through October of 1998 at 41 estuarine locations. Although regions were identified in relation to seasonal density of cells present, there were no strong relationships to specific water quality variables. Factors that may have influenced these results included: a) several species were included in the group analyzed and this composite did not respond as a unit to changing environmental conditions; b) cell concentrations were low and there were a large …
Sediment Denitrification Potential In The Elizabeth River, Virginia, Surena Fazeli-Matin, Andrew S. Gordon, Harold G. Marshall
Sediment Denitrification Potential In The Elizabeth River, Virginia, Surena Fazeli-Matin, Andrew S. Gordon, Harold G. Marshall
Biological Sciences Faculty Publications
Sediment denitrification potential from two sites in the Elizabeth River estuary was studied over a nine-month period using the acetylene blockage method. Rates of microbial processes in this environment are of interest because of the high concentration of toxics present in some parts of the system. Highest rates were found in the highly polluted Southern Branch of the Elizabeth River with nitrate amended sediment ranging from 2-262 nmol N20/h per 20ml of sediment and exhibiting maximal rates during spring and fall. Rates in the Main Stem of the Elizabeth River were lower, with less than 1-85 nmol N …