Sediment Contaminants in Northern Egyptian Coastal Lakes

2018 ◽  
pp. 63-81
Author(s):  
L. I. Mohamedein ◽  
M. A. El-Sawy ◽  
M. A. Bek
Keyword(s):  
Coastal Lakes ◽  
Sediment Contaminants

Impact of Catchment Urbanisation on Lake Macquarie (Australia)

1989 ◽  
Vol 21 (2) ◽  
pp. 205-210 ◽  
Author(s):  
B. L. Simmons ◽  
S. L. Trengove
Keyword(s):  
Nutrient Enrichment ◽  
Benthic Algae ◽  
Water Clarity ◽  
Nutrient Concentrations ◽  
Lake Area ◽  
Seagrass Beds ◽  
Coastal Lake ◽  
Aesthetic Quality ◽  
Wastewater Disposal ◽  
Coastal Lakes

Increasing urbanisation of coastal areas is leading to impacts on coastal lakes which decrease their amenity for recreation and tourism. Runoff and wastewater discharge cause siltation, impact seagrass beds and change the characteristics of open waters, affecting boating, swimming, fishing and the aesthetic quality of the locale. Management of urban development and wastewater disposal is required to minimise sedimentation and nutrient enrichment. This could include development restrictions, runoff controls and a strategy for wastewater treatment and discharge. The catchment of Lake Macquarie, a marine coastal lake, has been progressively urbanised since 1945. Urbanisation, through increased stormwater runoff and point source discharges, has caused a major impact on the lake in terms of sedimentation and nutrient enrichment. Losses of lake area and navigable waters have occurred. Accompanying problems include changes in the distribution of seagrass beds and nuisance growths of benthic algae. Since the 1950's, dry weather nutrient concentrations have increased and mean water clarity has decreased. Severe problems, as observed in other New South Wales coastal lakes, for example benthic algae in Lake Illawarra and Tuggerah Lakes, have not yet developed. Because of the lead time taken to implement policies and controls, trends should be identified and policies developed now so as to avoid nutrient buildup and development of sustained problems.

Towards managing catchment water utilisation for the Lake St Lucia ecosystem

1995 ◽  
Vol 32 (5-6) ◽  
pp. 95-101
Author(s):  
D. R. Weston ◽  
G. Quibell ◽  
W. V. Pitman
Keyword(s):  
Catchment Area ◽  
Management Decision ◽  
Catchment Management ◽  
Lake Levels ◽  
Salinity Regime ◽  
Wetland Ecosystems ◽  
Coastal Lakes ◽  
Lake Evaporation ◽  
Wet And Dry Cycles ◽  
Management Decision Support

Lake St Lucia is one of Africa's largest coastal lakes, and is one of South Africa's most important wetland ecosystems. However, like many ecosystems, it is under threat from increased demands for water in its catchment area. Reduced runoff primarily impacts on the salinity regime of the lake. At low lake levels there is a net inflow of seawater to the lake. Evaporation concentrates the salts, and lake salinities rise to several times that of seawater. In water periods, lake levels rise and there is a net outflow toward the sea. Under these conditions salinities are low. The lake therefore naturally experiences a range of salinities associated with wet and dry cycles. Increased water use in the catchment will, however, impact on this natural salinity regime. This paper introduces a suite of models which will be used to facilitate management of the water resources of the catchment. The preliminary work presented demonstrates the ability of the models to provide meaningful input into a catchment management decision-support system.

Sediment contaminants in Casco Bay, Maine: inventories, sources, and potential for biological impact

1994 ◽  
Vol 28 (1) ◽  
pp. 1-15 ◽  
Author(s):  
M. C. Kennicutt ◽  
T. L. Wade ◽  
B. J. Presley ◽  
A. G. Requejo ◽  
J. M. Brooks ◽  
...  
Keyword(s):  
Biological Impact ◽  
Sediment Contaminants

Gastrotricha from Italian brackish water environments with the description of a new species of Chaetonotus

1999 ◽  
Vol 79 (4) ◽  
pp. 585-592 ◽  
Author(s):  
P. Tongiorgi ◽  
E. Fregni ◽  
M. Balsamo
Keyword(s):  
New Species ◽  
Brackish Water ◽  
Systematic Sampling ◽  
Coastal Lakes ◽  
Brackish Waters ◽  
Freshwater Habitats ◽  
Sampling Programme ◽  
First Time ◽  
River Po ◽  
A New Species

During 1996–1997 a systematic sampling programme was carried out in brackish coastal lakes and lagoons and in the delta of the River Po. In six of the nine collecting locations, 12 species of Gastrotricha were identified. One species, Chaetonotus ichthydioides, is new to science; another three species, the chaetonotidans Heterolepidoderma foliatum and the macrodasyidans Dendrodasys ponticus and Turbanella cf. pontica, and one macrodasyidan genus, Paradasys (P. subterraneus), were found in Italy for the first time. The unusual morphology of some of the species identified shows that Gastrotricha colonized brackish waters from both marine and freshwater habitats.

Contrasting effects of managed opening regimes on water quality in two intermittently closed and open coastal lakes

2010 ◽  
Vol 86 (4) ◽  
pp. 587-597 ◽  
Author(s):  
M. Schallenberg ◽  
S.T. Larned ◽  
S. Hayward ◽  
C. Arbuckle
Keyword(s):  
Water Quality ◽  
Coastal Lakes

Nutrient loading by anadromous alewife (Alosa pseudoharengus): contemporary patterns and predictions for restoration efforts

2010 ◽  
Vol 67 (8) ◽  
pp. 1211-1220 ◽  
Author(s):  
Derek C. West ◽  
Annika W. Walters ◽  
Stephen Gephard ◽  
David M. Post
Keyword(s):  
Nutrient Loading ◽  
Mesocosm Experiment ◽  
Alosa Pseudoharengus ◽  
Nutrient Budgets ◽  
Freshwater Lakes ◽  
Phosphorus Load ◽  
Coastal Lakes ◽  
Density Dependent ◽  
Early Survival ◽  
The 1960S

Anadromous alewives ( Alosa pseudoharengus ) have the potential to alter the nutrient budgets of coastal lakes as they migrate into freshwater as adults and to sea as juveniles. Alewife runs are generally a source of nutrients to the freshwater lakes in which they spawn, but juveniles may export more nutrients than adults import in newly restored populations. A healthy run of alewives in Connecticut imports substantial quantities of phosphorus; mortality of alewives contributes 0.68 g P·fish–1, while surviving fish add 0.18 g P, 67% of which is excretion. Currently, alewives contribute 23% of the annual phosphorus load to Bride Lake, but this input was much greater historically, with larger runs of bigger fish contributing 2.5 times more phosphorus in the 1960s. A mesocosm experiment in a nearby lake showed that juvenile alewife growth is strongly density dependent, but early survival may be too low for juvenile outmigration to balance adult inputs. In eutrophic systems where nutrients are a concern, managers can limit nutrient loading by capping adult returns at a level where juvenile populations would not be suppressed.

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