Multidisciplinary studies in the Chukchi Lease area have been establishing environmental baseline... more Multidisciplinary studies in the Chukchi Lease area have been establishing environmental baselines since 2008. In the 2011 field season, the study region was expanded in area more than 3 fold, now encompassing Hanna Shoal, and providing a better appreciation of the biological backdrop in the region. During 2011, chlorophyll and nutrients were low over the entire observation period. Both holozooplankton and meroplankton abundance and biomass were within the range of the previous three years, but there was a distinct increase in the relative proportion of larger-bodied animals. Gradients were also apparent in the abundance of many common species. A notable difference in 2011 from previous study years was the occurrence the copepod Calanus hyperboreus at a dozen stations over the Burger survey area, suggesting an incursion of Arctic Basin waters from the east, likely via Barrow Canyon. Zooplankton communities thus form a valuable means of establishing connectivity and transport of wate...
The most recent Ponto-Caspian species to invade the Laurentian Great Lakes is the crustacean Hemi... more The most recent Ponto-Caspian species to invade the Laurentian Great Lakes is the crustacean Hemimysis anomala, c 2006. A 549 bp fragment of the mitochondrial cytochrome oxidase I gene from populations of H. anomala throughout the Great lakes was analyzed to determine if established populations in Lakes Ontario, Erie, Huron, Michigan and the St. Lawrence River share the same lineage. Two different haplotypes, A1 and B1, were observed for H. anomala from Lakes Ontario, Erie, Huron, and the St. Lawrence River. Previously published data from Lake Michigan indicated the presence of only the A1 haplotype and identified the Danube River as the source region. Our results identify four regions as potential source populations for the invasion of H. anomala into the Great Lakes: Germany’s Lake Schwerin, the Mittellandkanal and the Lower Rhine, and the Danube River. Our results show that multiple introductions of H. anomala into the Great Lakes from separate populations originating in Germany ...
Multidisciplinary studies in the Chukchi Lease area have been establishing environmental baseline... more Multidisciplinary studies in the Chukchi Lease area have been establishing environmental baselines since 2008. In the 2011 field season, the study region was expanded in area more than 3 fold, now encompassing Hanna Shoal, and providing a better appreciation of the biological backdrop in the region. During 2011, chlorophyll and nutrients were low over the entire observation period. Both holozooplankton and meroplankton abundance and biomass were within the range of the previous three years, but there was a distinct increase in the relative proportion of larger-bodied animals. Gradients were also apparent in the abundance of many common species. A notable difference in 2011 from previous study years was the occurrence the copepod Calanus hyperboreus at a dozen stations over the Burger survey area, suggesting an incursion of Arctic Basin waters from the east, likely via Barrow Canyon. Zooplankton communities thus form a valuable means of establishing connectivity and transport of wate...
The most recent Ponto-Caspian species to invade the Laurentian Great Lakes is the crustacean Hemi... more The most recent Ponto-Caspian species to invade the Laurentian Great Lakes is the crustacean Hemimysis anomala, c 2006. A 549 bp fragment of the mitochondrial cytochrome oxidase I gene from populations of H. anomala throughout the Great lakes was analyzed to determine if established populations in Lakes Ontario, Erie, Huron, Michigan and the St. Lawrence River share the same lineage. Two different haplotypes, A1 and B1, were observed for H. anomala from Lakes Ontario, Erie, Huron, and the St. Lawrence River. Previously published data from Lake Michigan indicated the presence of only the A1 haplotype and identified the Danube River as the source region. Our results identify four regions as potential source populations for the invasion of H. anomala into the Great Lakes: Germany’s Lake Schwerin, the Mittellandkanal and the Lower Rhine, and the Danube River. Our results show that multiple introductions of H. anomala into the Great Lakes from separate populations originating in Germany ...
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