Estuaries
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Seasonality of materials transport through a coastal freshwater marsh: Riverine versus tidal forcing
Tập 9 Số 4 - Trang 301-308 - 1986
Transports of nitrate and suspended solids were measured six times from January 1984 until January 1985 in a small freshwater tidal bayou in south-central Louisiana. The bayou and adjacent marshes are influenced by Atchafalaya River discharges, tides, and coastal weather patterns. Large net ebb-directed water transports occurred in winter, spring, and summer, coincident with high river discharges,......
Capybara (Hydrochaeris hydrochaeris rodentia: Hydrochaeridae): A mammalian seagrass herbivore
Tập 27 Số 2 - Trang 197-200 - 2004
This note reports an unknown trophic interaction between a mammalian herbivore, the capybara (Hydrochaeris hydrochaeris), and the seagrassRuppia maritima (wigeongrass) and compares the feeding behavior of capybaras to other seagrass grazers. Observations were made in Spring 2002 in the Barra Grande, a small, shallow, moderately stratified, bar-built estuary at Ilha Grande, Rio de Janeiro State, so......
Temporal variability of remotely sensed suspended sediment and sea surface temperature patterns in Mobile Bay, Alabama
Tập 13 Số 2 - Trang 155-160 - 1990
Distribution patterns of suspended sediments and sea surface temperatures in, Mobile Bay were derived from algorithms using digital data from the visible, near infrared, and infrared channels of the Advanced Very High Resolution Radiometer (AVHRR) on the NOAA-TIROS-N satellite. Closely spaced AVHRR scenes for January 20, 24, and 29, 1982, were compared with available environmental information take......
Sources of oxygen demand in the lower San Joaquin River, California
Tập 27 Số 3 - Trang 405-418 - 2004
Dissolved oxygen concentration below 5 mg 1−1 has characterized the lower tidal portion of the San Joaquin River downstream of Stockton, California, during the summer and fall for the past four decades. Intensive field research in 2000 and 2001 indicated low dissolved oxygen concentration was restricted to the first 14 km of the river, which was deepened to 12 m for shipping, downstream of Stockto......
Effects of sediment contaminants and environmental gradients on macrobenthic community trophic structure in Gulf of Mexico estuaries
Tập 23 Số 3 - Trang 411-424 - 2000
Macrobenthic communities from estuaries throughout the northern Gulf of Mexico were studied to assess the influence of sediment contaminants and natural environmental factors on macrobenthic community trophic structure. Community trophic data were also used to evaluate whether results from laboratory sediment toxicity tests were effective indicators of site-specific differences in benthic trophic ......
Effects of common reed (Phragmites australis) invasion on marsh surface macrofauna: Response of fishes and decapod crustaceans
Tập 23 Số 5 - Trang 633-646 - 2000
The tidally inundated marsh surface is an importnat site for energy exchanges for many resident and transient species. In many areas along the East Coast of the U.S. the dominant vegetation,Spartina alterniflora, has been replaced by the common reed (Phragmites australis). This shift has caused concern about the impact ofPhragmites on marsh fauna but research in this area has been limited. During ......
Seasonal control of the Saint-Lawrence maximum turbidity zone by tidal-flat sedimentation
Tập 9 Số 2 - Trang 84-94 - 1986
The core of the turbidity maximum zone in the Saint-Lawrence Estuary is located in the North Channel and oscillates in front of the large (3×106 m2) intertidal flats and marshes of Cap Tourmente. It is shown that seasonal fluctuations in the intensity and the position of this core are mainly determined by suspended sediment exchanges between the channel and the marshes. Fine sediments, most of the......
The influence of nitrogen level, form, and application method on the growth response ofSpartina alterniflora in North Carolina
Tập 2 Số 2 - Trang 106-112 - 1979
The influence of nitrogen level, form, and application method on the growth response of short and tallSpartina alterniflora was determined in a North Carolina salt marsh. The application of various nitrogen levels increased the aerial standing crop of shortSpartina as much as 172%, but had no significant effect on that of the tall form. Band application produced a significantly greater yield respo......
The economic effects of harmful algal blooms in the United States: Estimates, assessment issues, and information needs
Tập 25 Số 4 - Trang 819-837 - 2002
During the last several decades, harmful algal bloom (HAB) events have been observed in more locations than ever before throughout the United States. Scientists have identified a larger number of algal species involved in HABs, more toxins have been uncovered, and more fisheries resources have been affected. Whether this apparent increase in HAB events is a real phenomenon or is the result of incr......
Hypersaline bottom water: Peard Bay, Alaska
Tập 2 Số 3 - Trang 189-193 - 1979
Hypersaline bottom conditions have been observed in Peard Bay, Alaska. The water appears to be renewed on an annual basis. Although it does not seem to affect permafrost degradation rates in Peard Bay, similar pools of water along the Beaufort Sea coast could greatly increase the rates of permafrost degradation. Order of magnitude estimates suggest that the hypersaline waters do not become anoxic.