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Full-Text Articles in Life Sciences
Anthropogenic Controls On Overwash Deposition: Evidence And Consequences, Laura J. Rogers, Laura J. Moore, Evan B. Goldstein, Christopher J. Hein, Jorge Lorenzo-Trueba, Andrew D. Ashton
Anthropogenic Controls On Overwash Deposition: Evidence And Consequences, Laura J. Rogers, Laura J. Moore, Evan B. Goldstein, Christopher J. Hein, Jorge Lorenzo-Trueba, Andrew D. Ashton
VIMS Articles
Accelerated sea level rise and the potential for an increase in frequency of the most intense hurricanes due to climate change threaten the vitality and habitability of barrier islands by lowering their relative elevation and altering frequency of overwash. High-density development may further increase island vulnerability by restricting delivery of overwash to the subaerial island. We analyzed pre-Hurricane Sandy and post-Hurricane Sandy (2012) lidar surveys of the New Jersey coast to assess human influence on barrier overwash, comparing natural environments to two developed environments (commercial and residential) using shore-perpendicular topographic profiles. The volumes of overwash delivered to residential and commercial …
Phytoplankton Growth Rates In The Ross Sea, Antarctica, Anna F. Mosby, Walker O. Smith Jr.
Phytoplankton Growth Rates In The Ross Sea, Antarctica, Anna F. Mosby, Walker O. Smith Jr.
VIMS Articles
The Ross Sea is a highly productive region of the Southern Ocean, but phytoplankton growth rates there are poorly constrained. Variability in growth rates was investigated on a January February 2012 cruise to the Ross Sea using 37 C-14 isotopic tracer incubations and 11 dilution experiments. We examined the effects of extended incubations on measured growth rates in C-14 incubations, quantified phytoplankton growth and grazing mortality rates through dilution experiments, and analyzed the effects of irradiance on carbon:chlorophyll ratios in dilution experiments. Growth rates in C-14 incubations ranged from 0.03 to 0.85 d(-1). We found that chlorophyll-based phytoplankton growth rates …
Decoupling The Influence Of Biological And Physical Processes On The Dissolved Oxygen In The Chesapeake Bay, Jiabi Du, Jian Shen
Decoupling The Influence Of Biological And Physical Processes On The Dissolved Oxygen In The Chesapeake Bay, Jiabi Du, Jian Shen
VIMS Articles
It is instructive and essential to decouple the effects of biological and physical processes on the dissolved oxygen condition, in order to understand their contribution to the interannual variability of hypoxia in Chesapeake Bay since the 1980s. A conceptual bottom DO budget model is applied, using the vertical exchange time scale (VET) to quantify the physical condition and net oxygen consumption rate to quantify biological activities. By combining observed DO data and modeled VET values along the main stem of the Chesapeake Bay, the monthly net bottom DO consumption rate was estimated for 1985-2012. The DO budget model results show …
Use Of Esi-Fticr-Ms To Characterize Dissolved Organic Matter In Headwater Streams Draining Forest-Dominated And Pasture-Dominated Watersheds, Yuehan Lu, Xiaping Li, Rajaa Mesfioui, James E. Bauer, R M. Chambers, Elizabeth A. Canuel, Patrick Hatcher
Use Of Esi-Fticr-Ms To Characterize Dissolved Organic Matter In Headwater Streams Draining Forest-Dominated And Pasture-Dominated Watersheds, Yuehan Lu, Xiaping Li, Rajaa Mesfioui, James E. Bauer, R M. Chambers, Elizabeth A. Canuel, Patrick Hatcher
VIMS Articles
Electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry (ESI-FTICR-MS) has proven to be a powerful technique revealing complexity and diversity of natural DOM molecules, but its application to DOM analysis in grazing-impacted agricultural systems remains scarce. In the present study, we presented a case study of using ESI-FTICR-MS in analyzing DOM from four headwater streams draining forest-or pasture-dominated watersheds in Virginia, USA. In all samples, most formulas were CHO compounds (71.8-87.9%), with other molecular series (CHOS, CHON, CHONS, and CHOP (N, S)) accounting for only minor fractions. All samples were dominated by molecules falling in the lignin-like region (H/C …