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Full-Text Articles in Physical Sciences and Mathematics
West Antarctic Peninsula: An Ice-Dependent Coastal Marine Ecosystem In Transition, Hugh Ducklow, William R. Fraser, Michael P. Meredith, Sharon E. Stammerjohn, Scott C. Doney, Douglas G. Martinson, Sevrine F. Sailley, Oscar M. Schofield, Deborah K. Steinberg, Hugh Venables, Charles Amsler
West Antarctic Peninsula: An Ice-Dependent Coastal Marine Ecosystem In Transition, Hugh Ducklow, William R. Fraser, Michael P. Meredith, Sharon E. Stammerjohn, Scott C. Doney, Douglas G. Martinson, Sevrine F. Sailley, Oscar M. Schofield, Deborah K. Steinberg, Hugh Venables, Charles Amsler
VIMS Articles
The extent, duration, and seasonality of sea ice and glacial discharge strongly influence Antarctic marine ecosystems. Most organisms' life cycles in this region are attuned to ice seasonality The annual retreat and melting of sea ice in the austral spring stratifies the upper ocean, triggering large phytoplankton blooms. The magnitude of the blooms is proportional to the winter extent of ice cover, which can act as a barrier to wind mixing. Antarctic krill, one of the most abundant metazoan populations on Earth, consume phytoplankton blooms dominated by large diatoms. Krill, in turn, support a large biomass of predators, including penguins, …
Trichodesmium-Derived Dissolved Organic Matter Is A Source Of Nitrogen Capable Of Supporting The Growth Of Toxic Red Tide Karenia Brevis, Rachel E. Sipler, Deborah A. Bronk, Sybil P. Seitzinger, Ronald J. Lauck, Lora R. Mcguinness, Gary J. Kirkpatrick, Cynthia A. Heil, Lee J. Kerkhof, Oscar M. Schofield
Trichodesmium-Derived Dissolved Organic Matter Is A Source Of Nitrogen Capable Of Supporting The Growth Of Toxic Red Tide Karenia Brevis, Rachel E. Sipler, Deborah A. Bronk, Sybil P. Seitzinger, Ronald J. Lauck, Lora R. Mcguinness, Gary J. Kirkpatrick, Cynthia A. Heil, Lee J. Kerkhof, Oscar M. Schofield
VIMS Articles
Dissolved organic nitrogen (DON) produced by the nitrogen-fixer Trichodesmium sp. has the potential to serve as a nitrogen source for the red tide dinoflagellate Karenia brevis. Dissolved organic matter (DOM) from laboratory cultures of Trichodesmium sp. was isolated, concentrated and then supplied as a nutrient source to K. brevis cells collected from the Gulf of Mexico. K. brevis abundance increased immediately after Trichodesmium sp. cellular exudate (TCE) addition, allowing the population to double within the first 24 h. There was rapid and complete utilization of the TCE DON as well as ~89% of the TCE dissolved organic phosphorus (DOP). Additionally, …
Projected Hg Dietary Exposure Of 3 Bird Species Nesting On A Contaminated Floodplain (South River, Virginia, Usa), Jc Wang, Mc Newman
Projected Hg Dietary Exposure Of 3 Bird Species Nesting On A Contaminated Floodplain (South River, Virginia, Usa), Jc Wang, Mc Newman
VIMS Articles
Dietary Hg exposure was modeled for Carolina wren (Thryothorus ludovicianus), Eastern song sparrow (Melospiza melodia), and Eastern screech owl (Otus asio) nesting on the contaminated South River floodplain (Virginia, USA). Parameterization of Monte-Carlo models required formal expert elicitation to define bird body weight and feeding ecology characteristics because specific information was either unavailable in the published literature or too difficult to collect reliably by field survey. Mercury concentrations and weights for candidate food items were obtained directly by field survey. Simulations predicted the probability that an adult bird during breeding season would ingest specific amounts of Hg during daily foraging …