The Experts below are selected from a list of 369 Experts worldwide ranked by ideXlab platform
Thomas F Nalepa - One of the best experts on this subject based on the ideXlab platform.
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Preliminary investigations for causes of the disappearance of Diporeia spp. from Lake Ontario
2015Co-Authors: Ronald Dermott, Thomas F Nalepa, Mohiuddin Munawar, Robert Bonnell, Silvina Carou, Heather Niblock, Gretchen MessickAbstract:The amphipod Diporeia spp. comprised 60-80 % of the benthos in offshore Lake Ontario and was an important food for fish. In eastern Lake Ontario, Diporeia spp. began disappearing in 1993 just after the arrival of dreissenid mussels. We compared survival of Diporeia spp. and Hyalella azteca in sediments from areas where Diporeia spp. populations had vanished with survival in sediments still inhabited. Survival was also examined in the presence of zebra mussel (Dreissena polymorpha) Pseudofeces, filtered water from mussel cultures, and added bacteria. The Microtox ® test indicated that sediment pore water was not toxic. Sediments from sites with large Dreissena spp
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dispersal and emerging ecological impacts of ponto caspian species in the laurentian great lakes
Canadian Journal of Fisheries and Aquatic Sciences, 2002Co-Authors: Henry A Vanderploeg, James R. Liebig, Thomas F Nalepa, David J Jude, Edward L Mills, Kristen T Holeck, Igor A Grigorovich, Henn OjaveerAbstract:We describe, explain, and "predict" dispersal and ecosystem impacts of six Ponto-Caspian endemic species that recently invaded the Great Lakes via ballast water. The zebra mussel, Dreissena polymorpha, and quagga mussel, Dreissena bugensis, continue to colonize hard and soft substrates of the Great Lakes and are changing ecosystem function through mechanisms of ecosystem engineering (increased water clarity and reef building), fouling native mussels, high particle filtration rate with selective rejection of colonial cyanobacteria in Pseudofeces, alteration of nutrient ratios, and facilitation of the rapid spread of their Ponto-Caspian associates, the benthic amphipod Echinogammarus ischnusand the round goby, Neogobius melanostomus , which feeds on zebra mussels. The tubenose goby, Proterorhinus marmoratus , which does not feed on zebra mussels, has not spread rapidly. Impacts of these benthic invaders vary with site: in some shallow areas, habitat changes and the Dreissena → round goby → piscivore food chain have improved conditions for certain native game fishes and waterfowl; in offshore waters, Dreissena is competing for settling algae with the native amphipod Diporeia spp., which are disappearing to the detriment of the native deep-water fish community. The predatory cladoceran Cercopagis pengoi may compete with small fishes for zooplankton and increase food-chain length.
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zebra mussel dreissena polymorpha selective filtration promoted toxic microcystis blooms in saginaw bay lake huron and lake erie
Canadian Journal of Fisheries and Aquatic Sciences, 2001Co-Authors: Henry A Vanderploeg, James R. Liebig, Wayne W. Carmichael, Thomas H. Johengen, Gary L. Fahnenstiel, Thomas F NalepaAbstract:Microcystis aeruginosa, a planktonic colonial cyanobacterium, was not abundant in the 2-year period before ze- bra mussel (Dreissena polymorpha) establishment in Saginaw Bay (Lake Huron) but became abundant in three of five summers subsequent of mussel establishment. Using novel methods, we determined clearance, capture, and assimilation rates for zebra mussels feeding on natural and laboratory M. aeruginosa strains offered alone or in combination with other algae. Results were consistent with the hypothesis that zebra mussels promoted blooms of toxic M. aeruginosa in Saginaw Bay, western Lake Erie, and other lakes through selective rejection in Pseudofeces. Mussels exhibited high feeding rates similar to those seen for a highly desirable food alga (Cryptomonas) with both large (>53 m) and small ( 53 m) et de petites (<53 m) colonies d'une souche non-toxique et d'une souche toxique de laboratoire de M. aeruginosa, qui inhibent l'alimentation chez le zooplancton, les moules maintiennent des taux eleves d'alimentation, semblables a ceux que l'on observe lorsqu'on les nourrit d'une algue tres recherchee (Cryptomonas). Dans des experiences d'alimentation utilisant des souches naturelles de M. aeruginosa toxiques de la baie de Saginaw et du lac Erie et un isolat toxique du lac Erie, les moules presentent des taux de filtration reduits ou normaux et rejettent M. aeruginosa dans leurs Pseudofeces. Ce rejet selectif depend de la presence de grandes colonies de souches toxiques «a gout desagreable» de M. aeruginosa qui peuvent etre eliminees facilement, alors que les petites algues appetissantes sont ingerees.
Henry A Vanderploeg - One of the best experts on this subject based on the ideXlab platform.
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dispersal and emerging ecological impacts of ponto caspian species in the laurentian great lakes
Canadian Journal of Fisheries and Aquatic Sciences, 2002Co-Authors: Henry A Vanderploeg, James R. Liebig, Thomas F Nalepa, David J Jude, Edward L Mills, Kristen T Holeck, Igor A Grigorovich, Henn OjaveerAbstract:We describe, explain, and "predict" dispersal and ecosystem impacts of six Ponto-Caspian endemic species that recently invaded the Great Lakes via ballast water. The zebra mussel, Dreissena polymorpha, and quagga mussel, Dreissena bugensis, continue to colonize hard and soft substrates of the Great Lakes and are changing ecosystem function through mechanisms of ecosystem engineering (increased water clarity and reef building), fouling native mussels, high particle filtration rate with selective rejection of colonial cyanobacteria in Pseudofeces, alteration of nutrient ratios, and facilitation of the rapid spread of their Ponto-Caspian associates, the benthic amphipod Echinogammarus ischnusand the round goby, Neogobius melanostomus , which feeds on zebra mussels. The tubenose goby, Proterorhinus marmoratus , which does not feed on zebra mussels, has not spread rapidly. Impacts of these benthic invaders vary with site: in some shallow areas, habitat changes and the Dreissena → round goby → piscivore food chain have improved conditions for certain native game fishes and waterfowl; in offshore waters, Dreissena is competing for settling algae with the native amphipod Diporeia spp., which are disappearing to the detriment of the native deep-water fish community. The predatory cladoceran Cercopagis pengoi may compete with small fishes for zooplankton and increase food-chain length.
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zebra mussel dreissena polymorpha selective filtration promoted toxic microcystis blooms in saginaw bay lake huron and lake erie
Canadian Journal of Fisheries and Aquatic Sciences, 2001Co-Authors: Henry A Vanderploeg, James R. Liebig, Wayne W. Carmichael, Thomas H. Johengen, Gary L. Fahnenstiel, Thomas F NalepaAbstract:Microcystis aeruginosa, a planktonic colonial cyanobacterium, was not abundant in the 2-year period before ze- bra mussel (Dreissena polymorpha) establishment in Saginaw Bay (Lake Huron) but became abundant in three of five summers subsequent of mussel establishment. Using novel methods, we determined clearance, capture, and assimilation rates for zebra mussels feeding on natural and laboratory M. aeruginosa strains offered alone or in combination with other algae. Results were consistent with the hypothesis that zebra mussels promoted blooms of toxic M. aeruginosa in Saginaw Bay, western Lake Erie, and other lakes through selective rejection in Pseudofeces. Mussels exhibited high feeding rates similar to those seen for a highly desirable food alga (Cryptomonas) with both large (>53 m) and small ( 53 m) et de petites (<53 m) colonies d'une souche non-toxique et d'une souche toxique de laboratoire de M. aeruginosa, qui inhibent l'alimentation chez le zooplancton, les moules maintiennent des taux eleves d'alimentation, semblables a ceux que l'on observe lorsqu'on les nourrit d'une algue tres recherchee (Cryptomonas). Dans des experiences d'alimentation utilisant des souches naturelles de M. aeruginosa toxiques de la baie de Saginaw et du lac Erie et un isolat toxique du lac Erie, les moules presentent des taux de filtration reduits ou normaux et rejettent M. aeruginosa dans leurs Pseudofeces. Ce rejet selectif depend de la presence de grandes colonies de souches toxiques «a gout desagreable» de M. aeruginosa qui peuvent etre eliminees facilement, alors que les petites algues appetissantes sont ingerees.
Anne Thessen - One of the best experts on this subject based on the ideXlab platform.
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Oyster Pseudofeces roll144#12
2012Co-Authors: Anne ThessenAbstract:This picture of oyster (Crassostrea virginica) Pseudofeces was taken with an epifluorescence microscope using a 10X objective. The photo was taken on July 23, 2000 by Quay Dortch at LUMCON as a part of the experiment series published in Thessen et al. 2009 Crassostrea virginica grazing on toxic and non-toxic diatoms. Toxicon.doi:10.1016/j.toxicon.2009.10.011. The feces is from an oyster that was fed Pseudo-nitzschia delicatissima strain LaPn-4. The oyster was 36mm in length. It was obtained from an aquaculture facility, stored in an ambient flow-through seawater system at LUMCON before starvation and experimentation. The LaPn-4 strain was isolated in Louisiana waters in 1999 and is characterized in Thessen et al. 2005 Effect of salinity on Pseudo-nitzschia species (Bacillariophyceae) growth and distribution. J. Phyc. 41:21-29
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Oyster Pseudofeces roll143#22
2012Co-Authors: Anne ThessenAbstract:This picture of oyster (Crassostrea virginica) Pseudofeces was taken with an epifluorescent microscope using a 20X objective. The photo was taken on July 23, 2000 by Quay Dortch at LUMCON as a part of the experiment series published in Thessen et al. 2009 Crassostrea virginica grazing on toxic and non-toxic diatoms. Toxicon.doi:10.1016/j.toxicon.2009.10.011. The Pseudofeces is from an oyster that was fed Pseudo-nitzschia delicatissima strain LaPn-4. The sample was collected approximately one hour of the feeding. The oyster was 40mm in length. It was obtained from an aquaculture facility, stored in an ambient flow-through seawater system at LUMCON before starvation and experimentation. The LaPn-4 strain was isolated in Louisiana waters in 1999 and is characterized in Thessen et al. 2005 Effect of salinity on Pseudo-nitzschia species (Bacillariophyceae) growth and distribution. J. Phyc. 41:21-29
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Oyster Pseudofeces roll143#25
2012Co-Authors: Anne ThessenAbstract:This picture of oyster (Crassostrea virginica) Pseudofeces was taken with an epifluorescence microscope using a 40X objective. The photo was taken on July 23, 2000 by Quay Dortch at LUMCON as a part of the experiment series published in Thessen et al. 2009 Crassostrea virginica grazing on toxic and non-toxic diatoms. Toxicon.doi:10.1016/j.toxicon.2009.10.011. The Pseudofeces is from an oyster that was fed Pseudo-nitzschia delicatissima strain LaPn-4. The sample was collected approximately one hour of the feeding. The oyster was 40mm in length. It was obtained from an aquaculture facility, stored in an ambient flow-through seawater system at LUMCON before starvation and experimentation. The LaPn-4 strain was isolated in Louisiana waters in 1999 and is characterized in Thessen et al. 2005 Effect of salinity on Pseudo-nitzschia species (Bacillariophyceae) growth and distribution. J. Phyc. 41:21-29
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Oyster Pseudofeces roll143#26
2012Co-Authors: Anne ThessenAbstract:This picture of oyster (Crassostrea virginica) Pseudofeces was taken with transmitted light using a 40X objective. The photo was taken on July 23, 2000 by Quay Dortch at LUMCON as a part of the experiment series published in Thessen et al. 2009 Crassostrea virginica grazing on toxic and non-toxic diatoms. Toxicon.doi:10.1016/j.toxicon.2009.10.011. The Pseudofeces is from an oyster that was fed Pseudo-nitzschia delicatissima strain LaPn-4. The sample was collected approximately one hour of the feeding. The oyster was 40mm in length. It was obtained from an aquaculture facility, stored in an ambient flow-through seawater system at LUMCON before starvation and experimentation. The LaPn-4 strain was isolated in Louisiana waters in 1999 and is characterized in Thessen et al. 2005 Effect of salinity on Pseudo-nitzschia species (Bacillariophyceae) growth and distribution. J. Phyc. 41:21-29
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Oyster experiment
2012Co-Authors: Anne ThessenAbstract:This image is the top view of one experimental jar containing five aquaculture oysters (Crassostrea virginica). These were preliminary grazing experiments that had to be adjusted because of excess Pseudofeces production by the oysters which were less than 40 mm in length. The results from this series of experiments are published in Thessen et al. 2009 Crassostrea virginica grazing on toxic and non-toxic diatoms. Toxicon.doi:10.1016/j.toxicon.2009.10.01
James R. Liebig - One of the best experts on this subject based on the ideXlab platform.
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Zebra mussel (Dreissena polymorpha) selective filtration promoted toxic Microcystis blooms in
2015Co-Authors: Henry A., James R. Liebig, Wayne W. Carmichael, Megan A. Agy, Thomas H. Johengen, Gary L. FahnenstielAbstract:Abstract: Microcystis aeruginosa, a planktonic colonial cyanobacterium, was not abundant in the 2-year period before ze-bra mussel (Dreissena polymorpha) establishment in Saginaw Bay (Lake Huron) but became abundant in three of five summers subsequent of mussel establishment. Using novel methods, we determined clearance, capture, and assimilation rates for zebra mussels feeding on natural and laboratory M. aeruginosa strains offered alone or in combination with other algae. Results were consistent with the hypothesis that zebra mussels promoted blooms of toxic M. aeruginosa in Saginaw Bay, western Lake Erie, and other lakes through selective rejection in Pseudofeces. Mussels exhibited high feeding rates similar to those seen for a highly desirable food alga (Cryptomonas) with both large (>53 mm) and small (<53 mm) colo-nies of a nontoxic and a toxic laboratory strain of M. aeruginosa known to cause blockage of feeding in zooplankton. In experiments with naturally occurring toxic M. aeruginosa from Saginaw Bay and Lake Erie and a toxic isolate from Lake Erie, mussels exhibited lowered or normal filtering rates with rejection of M. aeruginosa in Pseudofeces. Selective rejection depended on “unpalatable ” toxic strains of M. aeruginosa occurring as large colonies that could be rejected efficiently while small desirable algae were ingested. Résumé: Mycrocystis aeruginosa, une cyanobactérie qui forme des colonies planctoniques, s’est multipliée dans la Baie de Saginaw (Lac Huron) durant trois des cinq étés qui ont suivi l’établissement de la Moule zébrée (Dreissen
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dispersal and emerging ecological impacts of ponto caspian species in the laurentian great lakes
Canadian Journal of Fisheries and Aquatic Sciences, 2002Co-Authors: Henry A Vanderploeg, James R. Liebig, Thomas F Nalepa, David J Jude, Edward L Mills, Kristen T Holeck, Igor A Grigorovich, Henn OjaveerAbstract:We describe, explain, and "predict" dispersal and ecosystem impacts of six Ponto-Caspian endemic species that recently invaded the Great Lakes via ballast water. The zebra mussel, Dreissena polymorpha, and quagga mussel, Dreissena bugensis, continue to colonize hard and soft substrates of the Great Lakes and are changing ecosystem function through mechanisms of ecosystem engineering (increased water clarity and reef building), fouling native mussels, high particle filtration rate with selective rejection of colonial cyanobacteria in Pseudofeces, alteration of nutrient ratios, and facilitation of the rapid spread of their Ponto-Caspian associates, the benthic amphipod Echinogammarus ischnusand the round goby, Neogobius melanostomus , which feeds on zebra mussels. The tubenose goby, Proterorhinus marmoratus , which does not feed on zebra mussels, has not spread rapidly. Impacts of these benthic invaders vary with site: in some shallow areas, habitat changes and the Dreissena → round goby → piscivore food chain have improved conditions for certain native game fishes and waterfowl; in offshore waters, Dreissena is competing for settling algae with the native amphipod Diporeia spp., which are disappearing to the detriment of the native deep-water fish community. The predatory cladoceran Cercopagis pengoi may compete with small fishes for zooplankton and increase food-chain length.
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zebra mussel dreissena polymorpha selective filtration promoted toxic microcystis blooms in saginaw bay lake huron and lake erie
Canadian Journal of Fisheries and Aquatic Sciences, 2001Co-Authors: Henry A Vanderploeg, James R. Liebig, Wayne W. Carmichael, Thomas H. Johengen, Gary L. Fahnenstiel, Thomas F NalepaAbstract:Microcystis aeruginosa, a planktonic colonial cyanobacterium, was not abundant in the 2-year period before ze- bra mussel (Dreissena polymorpha) establishment in Saginaw Bay (Lake Huron) but became abundant in three of five summers subsequent of mussel establishment. Using novel methods, we determined clearance, capture, and assimilation rates for zebra mussels feeding on natural and laboratory M. aeruginosa strains offered alone or in combination with other algae. Results were consistent with the hypothesis that zebra mussels promoted blooms of toxic M. aeruginosa in Saginaw Bay, western Lake Erie, and other lakes through selective rejection in Pseudofeces. Mussels exhibited high feeding rates similar to those seen for a highly desirable food alga (Cryptomonas) with both large (>53 m) and small ( 53 m) et de petites (<53 m) colonies d'une souche non-toxique et d'une souche toxique de laboratoire de M. aeruginosa, qui inhibent l'alimentation chez le zooplancton, les moules maintiennent des taux eleves d'alimentation, semblables a ceux que l'on observe lorsqu'on les nourrit d'une algue tres recherchee (Cryptomonas). Dans des experiences d'alimentation utilisant des souches naturelles de M. aeruginosa toxiques de la baie de Saginaw et du lac Erie et un isolat toxique du lac Erie, les moules presentent des taux de filtration reduits ou normaux et rejettent M. aeruginosa dans leurs Pseudofeces. Ce rejet selectif depend de la presence de grandes colonies de souches toxiques «a gout desagreable» de M. aeruginosa qui peuvent etre eliminees facilement, alors que les petites algues appetissantes sont ingerees.
Sandra E Shumway - One of the best experts on this subject based on the ideXlab platform.
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selectiveingestion and egestion of plastic particles by the blue mussel mytilus edulis and eastern oyster crassostreavirginica implications for using bivalves as bioindicatorsof microplastic pollution
Environmental Science & Technology, 2019Co-Authors: Evan J Ward, Shiye Zhao, Bridget A Holohan, Kayla M Mladinich, Tyler W Griffin, Jennifer Wozniak, Sandra E ShumwayAbstract:Microplastics (MP; 1 μm to 1 mm) of various shapes and compositions are ingested by numerous marine animals. Recently, proposals have been made to adopt bivalve molluscs as bioindicators of MP pollution. To serve as indicators of MP pollution, however, the proposed organisms should ingest, without bias, the majority of plastic particles to which they are exposed. To test this premise, eastern oysters, Crassostrea virginica, and blue mussels, Mytilus edulis, were offered variously sized polystyrene microspheres (diameters 19–1000 μm) and nylon microfibers (lengths 75–1075 × diameter 30 μm), and the proportion of each rejected in Pseudofeces and egested in feces was determined. For both species, the proportion of microspheres rejected increased from ca. 10–30% for the smallest spheres to 98% for the largest spheres. A higher proportion of the largest microsphere was rejected compared with the longest microfiber, but similar proportions of microfibers were ingested regardless of length. Differential egestion...
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Selective Ingestion and Egestion of Plastic Particles by the Blue Mussel (Mytilus edulis) and Eastern Oyster (Crassostrea virginica): Implications for Using Bivalves as Bioindicators of Microplastic Pollution.
Environmental science & technology, 2019Co-Authors: J. Evan Ward, Shiye Zhao, Bridget A Holohan, Kayla M Mladinich, Tyler W Griffin, Jennifer Wozniak, Sandra E ShumwayAbstract:Microplastics (MP; 1 μm to 1 mm) of various shapes and compositions are ingested by numerous marine animals. Recently, proposals have been made to adopt bivalve molluscs as bioindicators of MP pollution. To serve as indicators of MP pollution, however, the proposed organisms should ingest, without bias, the majority of plastic particles to which they are exposed. To test this premise, eastern oysters, Crassostrea virginica, and blue mussels, Mytilus edulis, were offered variously sized polystyrene microspheres (diameters 19-1000 μm) and nylon microfibers (lengths 75-1075 × diameter 30 μm), and the proportion of each rejected in Pseudofeces and egested in feces was determined. For both species, the proportion of microspheres rejected increased from ca. 10-30% for the smallest spheres to 98% for the largest spheres. A higher proportion of the largest microsphere was rejected compared with the longest microfiber, but similar proportions of microfibers were ingested regardless of length. Differential egestion of MP also occurred. As a result of particle selection, the number and types of MP found in the bivalve gut will depend upon the physical characteristics of the particles. Thus, bivalves will be poor bioindicators of MP pollution in the environment, and it is advised that other marine species be explored.
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Selective Ingestion and Egestion of Plastic Particles by the Blue Mussel (Mytilus edulis) and Eastern Oyster (Crassostrea virginica): Implications for Using Bivalves as Bioindicators of Microplastic Pollution.
Environmental Science & Technology, 2019Co-Authors: J. Evan Ward, Shiye Zhao, Bridget A Holohan, Kayla M Mladinich, Tyler W Griffin, Jennifer Wozniak, Sandra E ShumwayAbstract:Microplastics (MP; 1 μm to 1 mm) of various shapes and compositions are ingested by numerous marine animals. Recently, proposals have been made to adopt bivalve molluscs as bioindicators of MP pollution. To serve as indicators of MP pollution, however, the proposed organisms should ingest, without bias, the majority of plastic particles to which they are exposed. To test this premise, eastern oysters, Crassostrea virginica, and blue mussels, Mytilus edulis, were offered variously sized polystyrene microspheres (diameters 19–1000 μm) and nylon microfibers (lengths 75–1075 × diameter 30 μm), and the proportion of each rejected in Pseudofeces and egested in feces was determined. For both species, the proportion of microspheres rejected increased from ca. 10–30% for the smallest spheres to 98% for the largest spheres. A higher proportion of the largest microsphere was rejected compared with the longest microfiber, but similar proportions of microfibers were ingested regardless of length. Differential egestion...
