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Full-Text Articles in Life Sciences
Metazooplankton Community Structure, Feeding Rate Estimates, And Hydrography In A Meltwater-Influenced Greenlandic Fjord, Kam W. Tang, Torkel Gissel Nielsen, Peter Munk, John Mortensen
Metazooplankton Community Structure, Feeding Rate Estimates, And Hydrography In A Meltwater-Influenced Greenlandic Fjord, Kam W. Tang, Torkel Gissel Nielsen, Peter Munk, John Mortensen
VIMS Articles
In order to assess the potential responses of Greenland's coastal ecosystems to future climate change, we studied the hydrography and distribution of metazooplankton, along a transect from the slope waters beyond Fyllas Banke to the inner part of Godthabsfjord, West Greenland, in July and August 2008, and estimated feeding rates for some of the larger species groups. Within the 4 regional domains that were covered in the study (continental slope, continental shelf, outer sill region, and main fjord basin), salty coastal water and glacial runoff mixed to various extents, and 7 water masses with specific characteristics were identified. The common …
Vertical Structure, Seasonal Drawdown, And Net Community Production In The Ross Sea, Antarctica, Matthew C. Long, Robert B. Dunbar, Philippe D. Tortell, Walker O. Smith Jr., David A. Mucciarone, Giacomo R. Ditullio
Vertical Structure, Seasonal Drawdown, And Net Community Production In The Ross Sea, Antarctica, Matthew C. Long, Robert B. Dunbar, Philippe D. Tortell, Walker O. Smith Jr., David A. Mucciarone, Giacomo R. Ditullio
VIMS Articles
We calculate net community production (NCP) during summer 2005-2006 and spring 2006 in the Ross Sea using multiple approaches to determine the magnitude and consistency of rates. Water column carbon and nutrient inventories and surface ocean O-2/Ar data are compared to satellite-derived primary productivity (PP) estimates and C-14 uptake experiments. In spring, NCP was related to stratification proximal to upper ocean fronts. In summer, the most intense C drawdown was in shallow mixed layers affected by ice melt; depth-integrated C drawdown, however, increased with mixing depth. Delta O-2/Ar-based methods, relying on gas exchange reconstructions, underestimate NCP due to seasonal variations …
Early Season Depletion Of Dissolved Iron In The Ross Sea Polynya: Implications For Iron Dynamics On The Antarctic Continental Shelf, P. N. Sedwick, Walker O. Smith Jr.
Early Season Depletion Of Dissolved Iron In The Ross Sea Polynya: Implications For Iron Dynamics On The Antarctic Continental Shelf, P. N. Sedwick, Walker O. Smith Jr.
VIMS Articles
The Ross Sea polynya is among the most productive regions in the Southern Ocean and may constitute a significant oceanic CO2 sink. Based on results from several field studies, this region has been considered seasonally iron limited, whereby a "winter reserve" of dissolved iron (dFe) is progressively depleted during the growing season to low concentrations (similar to 0.1 nM) that limit phytoplankton growth in the austral summer (December-February). Here we report new iron data for the Ross Sea polynya during austral summer 2005-2006 (27 December-22 January) and the following austral spring 2006 (16 November-3 December). The summer 2005-2006 data show …
An Evaluation Of Ocean Color Model Estimates Of Marine Primary Productivity In Coastal And Pelagic Regions Across The Globe, V. S. Saba, Marjorie A.M. Friedrichs, Walker O. Smith Jr.
An Evaluation Of Ocean Color Model Estimates Of Marine Primary Productivity In Coastal And Pelagic Regions Across The Globe, V. S. Saba, Marjorie A.M. Friedrichs, Walker O. Smith Jr.
VIMS Articles
Nearly half of the earth's photosynthetically fixed carbon derives from the oceans. To determine global and region specific rates, we rely on models that estimate marine net primary productivity (NPP) thus it is essential that these models are evaluated to determine their accuracy. Here we assessed the skill of 21 ocean color models by comparing their estimates of depth-integrated NPP to 1156 in situ C-14 measurements encompassing ten marine regions including the Sargasso Sea, pelagic North Atlantic, coastal Northeast Atlantic, Black Sea, Mediterranean Sea, Arabian Sea, subtropical North Pacific, Ross Sea, West Antarctic Peninsula, and the Antarctic Polar Frontal Zone. …
Multi-Locus Phylogeny Of Sponge-Dwelling Snapping Shrimp (Caridea: Alpheidae: Synalpheus) Supports Morphology-Based Species Concepts, Km Hultgren, Je Duffy
Multi-Locus Phylogeny Of Sponge-Dwelling Snapping Shrimp (Caridea: Alpheidae: Synalpheus) Supports Morphology-Based Species Concepts, Km Hultgren, Je Duffy
VIMS Articles
Alpheid snapping shrimp are one of the most diverse groups of coral-reef fauna, and sponge-dwelling shrimp in the genus Synalpheus (gambarelloides species group) have in particular become a model system for studying the evolution of social biology and host use in marine invertebrates. Despite recent advances in understanding the evolution and systematics of Synalpheus, the taxonomy and phylogenetic relationships within this group remain challenging. More than 20 new species in the S. gambarelloides species group have been described over the past two decades, primarily within several cryptic species complexes, which has doubled the known diversity of this group …
Antarctic Sea Ice Carbon Dioxide System And Controls, Virginia Institute Of Marine Science, Agneta Fransson, Melissa Chierici, Patricia L. Yager, Walker O. Smith Jr.
Antarctic Sea Ice Carbon Dioxide System And Controls, Virginia Institute Of Marine Science, Agneta Fransson, Melissa Chierici, Patricia L. Yager, Walker O. Smith Jr.
VIMS Articles
In austral summer, from December 2008 to January 2009, we investigated the sea-ice carbon dioxide (CO(2)) system and CO(2) controls in the Amundsen and Ross Seas, Antarctica. We sampled seawater, brine and sea ice for the measurements of total alkalinity (A(T)), total inorganic carbon (DIC), pH, inorganic nutrients, particulate organic carbon (POC) and nitrogen (PON), chlorophyll a, pigments, salinity and temperature. Large variability in all measured parameters was observed in time and space due to the complex sea-ice dynamics. We discuss the controls of the sea-ice CO(2) system, such as brine rejection, biological processes, calcium carbonate (CaCO(3)) precipitation/dissolution and CO(2) …