نتایج جستجو برای: haleh estuary

تعداد نتایج: 8470  

2014
Matthew D. Taylor Dylan E. van der Meulen Matthew C. Ives Chris T. Walsh Ivars V. Reinfelds Charles A. Gray

Physicochemical variability in estuarine systems plays an important role in estuarine processes and in the lifecycles of estuarine organisms. In particular, seasonality of freshwater inflow to estuaries may be important in various aspects of fish lifecycles. This study aimed to further understand these relationships by studying the movements of a top-level estuarine predator in response to phys...

Journal: :Brazilian journal of medical and biological research = Revista brasileira de pesquisas medicas e biologicas 2008
E Padmini B Vijaya Geetha M Usha Rani

The objective of this study was to determine the liver oxidative stress status of grey mullets living in heavy-metal-rich polluted Ennore estuary compared with unpolluted Kovalam estuary. Fish were collected from both estuaries during the monsoon and summer seasons from October 2004 to September 2006. Fish liver homogenate (N = 20 per group) was prepared for evaluating oxidative stress paramete...

Journal: :Environmental monitoring and assessment 2011
G D Martin P A Nisha K K Balachandran N V Madhu M Nair P Shaiju T Joseph K Srinivas G V M Gupta

The influence of anthropogenic loading on the distribution of soft bottom benthic organisms of a tropical estuary (Cochin backwaters) was examined. The industrial activities were found to be high in the northern and central part of the estuary, where dissolved inorganic nitrogen (DIN > 210 μM) and phosphorus (DIP > 6.5 μM) have caused high abundance of chlorophyll a (up to 73 mg m(-3)) and accu...

2015
Charmaine Carr-Harris Allen S. Gottesfeld Jonathan W. Moore

Migratory salmon transit estuary habitats on their way out to the ocean but this phase of their life cycle is more poorly understood than other phases. The estuaries of large river systems in particular may support many populations and several species of salmon that originate from throughout the upstream river. The Skeena River of British Columbia, Canada, is a large river system with high salm...

Journal: :Journal of physical oceanography 2009
James A Lerczak W Rockwell Geyer David K Ralston

The temporal response of the length of a partially-mixed estuary to changes in freshwater discharge, Qf , and tidal amplitude, UT , is studied using a 108 day time series collected along the length of the Hudson River estuary in the spring and summer of 2004 and a long-term (13.4 year) record of Qf , UT , and near-surface salinity. When Qf was moderately high, the tidally-averaged length of the...

2005
FRÉDÉRIC GAZEAU JEAN-PIERRE GATTUSO JACK J. MIDDELBURG NATACHA BRION LAURE-SOPHIE SCHIETTECATTE MICHEL FRANKIGNOULLE ALBERTO VIEIRA BORGES

Planktonic gross primary production (GPP), community respiration (CR), and nitrification (NIT) were measured monthly in the Scheldt estuary by the oxygen incubation method in 2003. No significant evolution of planktonic GPP was observed since the 1990s with high rates in the freshwater area (salinity 0; 97 6 65 mmol C m d) decreasing seaward (22–37 mmol C m d). A significant decrease of NIT was...

2008
Minhan Dai Lifang Wang Xianghui Guo Weidong Zhai Qing Li Biyan He Shuh-Ji Kao

We investigated the spatial distribution and seasonal variation of dissolved inorganic nitrogen in a large perturbed estuary, the Pearl River Estuary, based on three cruises conducted in winter (January 2005), summer (August 2005) and spring (March 2006). On-site incubation was also carried out for determining ammonium and nitrite oxidation 5 rates (nitrification rates). We observed a year-roun...

Journal: :Marine pollution bulletin 2003
X P Huang L M Huang W Z Yue

In the spring of 1998, 24-h time series and synchronization of vertical profiles of NO(3)-N, NO(2)-N, NH(3)-N, PO(4)-P, chlorophyll a, suspended substance, salinity, temperature and other chemical parameters were taken at 10 stations in the Pearl River estuary in order to analyze the status and characteristics of nutrients and eutrophication. The results indicated that dissolved inorganic nitro...

2006
Jonathan R. Pennock

Phytoplankton production in the Delaware Estuary (USA) was measured over several seasonal cycles (1980-1985). Seasonal variability in daily area1 production (JP; g C m-2 dl ) was dlrectly related to chlorophyll concentrations in the upper estuary, ranging from a maximum of 1.1 g C m-' d ' In summer to a minlmum of <O.l g C m-2 d-l in winter. In the mid and lower estuary, maximum JP occurred dur...

Journal: :The Science of the total environment 2010
David Whitall W Dean Hively Andrew K Leight Cathleen J Hapeman Laura L McConnell Thomas Fisher Clifford P Rice Eton Codling Gregory W McCarty Ali M Sadeghi Anne Gustafson Krystyna Bialek

Restoration of the Chesapeake Bay, the largest estuary in the United States, is a national priority. Documentation of progress of this restoration effort is needed. A study was conducted to examine water quality in the Choptank River estuary, a tributary of the Chesapeake Bay that since 1998 has been classified as impaired waters under the Federal Clean Water Act. Multiple water quality paramet...

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