The Ecological Condition of Dead-End Canals of the Delaware and Maryland Coastal Bays

Maxted, John R.; Weisberg, Stephen B.; Chaillou, J.; Eskin, R. A.; Kutz, Frederick W.

doi:10.2307/1352347

Cited by 38 publications

(60 citation statements)

References 10 publications

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“…Clearly, the natural estuaries and the poorly connected artificial lakes differ significantly at an assemblage level, and by implication at a process level, with substantial differences in species composition indicating quite different food web structures. Taken together, the restricted connectivity (Rozas 1992), restricted circulation (Maxted et al 1997) and poor water quality (Baird & Pereyra-Lago 1992, Maxted et al 1997) typical of many artificial waterways probably diminishes their value as nursery grounds for many species. Although the proliferation of artificial waterways around the world has the potential to provide expanded amounts of estuarine habitat available to fish (Baird et al 1981, Morton 1992 and to replace degraded habitat, unless modification is managed much more carefully than in Keyatta and Curralea Lakes the outcome is likely to be diminished fish habitat quality, reduced fisheries production and degraded ecosystem function.…”

Section: Drivers Of Temporal Changementioning

confidence: 99%

Temporal dynamics of fish assemblages of natural and artificial tropical estuaries

Sheaves¹,

Johnston²,

Connolly³

2010

Mar. Ecol. Prog. Ser.

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We sampled the fish fauna of 9 small natural estuaries and 2 constructed estuarine lakes in Australia's dry tropics over 15 mo to detail the dynamics of fish assembly structures over time. The estuaries chosen were small enough that the cast net sampling method which we used could cover the full extent of the estuary, obviating the problem that within-estuary migration might lead to the false appearance of assemblage change over time. Temporal patterns in assemblage structure were consistent across the natural estuaries, overprinting complex spatial differences. Nursery ground utilisation and assemblage composition were intimately interlinked. In natural estuaries, assemblage change was a function of changes in both probability of encounter of individual species and in species compositions, and the recruitment, growth and subsequent emigration from the estuaries of juveniles was the main contributor to overall assemblage change. In contrast, in artificial lakes where connectivity with offshore sources of recruits was restricted, species compositions were attenuated and temporal change was not driven by the recruitment of offshore species.

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Section: Drivers Of Temporal Changementioning

confidence: 99%

Temporal dynamics of fish assemblages of natural and artificial tropical estuaries

Sheaves¹,

Johnston²,

Connolly³

2010

Mar. Ecol. Prog. Ser.

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“…The mean low water depth of this area is about 2 m and a 1.4 m sill connects Torquay Canal with Bald Eagle Creek. Benthic sediments from these sites were used as fill for wetlands and housing developments in the 1960s (Maxted et al 1997), creating over a dozen holes at the bottom of Torquay Canal and Bald Eagle Creek with a maximum water depth of 5.5 m. Sampling took place at Torquay Canal Sites 1 and 5, the control sites (2 m); Torquay Canal Sites 2, 3 and 4 (5.5 m); and Bald Eagle Creek Sites 6 and 9 with holes (5.5 m).…”

Section: Methodsmentioning

confidence: 99%

“…The Delaware Inland Bays are small, shallow and poorly flushed estuaries. These shallow waters are typical along mid-Atlantic and Gulf coasts (Maxted et al 1997, Church et al 2002. Eutrophication has resulted in adverse ecological effects as seasonal anoxia and fish kills occur in this ecosystem (Luther et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Shift of algal community structure in dead end lagoons of the Delaware Inland Bays during seasonal anoxia

Ma¹,

Whereat²,

Luther³

2006

Aquat. Microb. Ecol.

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Development of seasonal anoxia and algal blooms was studied in Torquay Canal and Bald Eagle Creek, 2 dead end canals in the northern Rehoboth Bay, one of the 3 Delaware Inland Bays. Mean low water depth is ca. 2 m, but dredging has produced over a dozen holes with a water depth of 5.5 m. From May to September 2002, in situ temperature, salinity, pH, dissolved O 2 and H 2 S were measured in the water column. Nutrients (NO 3 -, NO 2 -, NH 4 + and PO 4 3 -) were analyzed and the dominant members of the phytoplankton community were identified and numerated from samples collected in conjunction with in situ depth profiles. In early May, a significant potential harmful Prorocentrum minimum bloom (275 µg l -1 chl a) was present in Torquay Canal. Dissolved O 2 was supersaturated in the surface water, but H 2 S developed below 2 m as the water column stratified. Diatom blooms were observed in late May and mid-July, the only times that O 2 penetrated deeper, but their biomass was not significant. In early September, a storm over 3 d partially mixed the water column, and a large Heterosigma akashiwo bloom (231 µg l -1 chl a) was observed. Our data indicate that nutrients accumulated in the water column from runoff, organic matter decomposition, and from Fe(III) (oxy)hydroxide reduction in sediments. High concentrations of H 2 S, NH 4 + and PO 4 3 -were present in the bottom waters during summer. PO 4 3 -and NH 4 + from the bottom water entered shallower waters as the oxic-anoxic interface moved up to the surface. The supply of nutrients from bottom to surface waters supported harmful algal blooms during seasonal anoxic conditions as dinoflagellates and flagellates dominated over diatoms in surface waters. Seasonal anoxia development is not only a potential threat to fish and shellfish but also causes shifts of algal species to potentially harmful taxa.

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“…A common environmental problem in urbanized coastal areas involves habitat and water quality degradation in residential and industrial dead-end canals and abandoned dock basins (Hawkins et al, 1992;Maxted et al, 1997). These degraded habitats are abundant in industrialized areas and may date back to colonial times in large US cities (e.g.…”

Section: Filling In Dead-end Canals and Basinsmentioning

confidence: 99%

Beneficial use of dredged material for habitat creation, enhancement, and restoration in New York–New Jersey Harbor

Yozzo¹,

Wilber

Will

2004

Journal of Environmental Management

115

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The Ecological Condition of Dead-End Canals of the Delaware and Maryland Coastal Bays

Cited by 38 publications

References 10 publications

Temporal dynamics of fish assemblages of natural and artificial tropical estuaries

Temporal dynamics of fish assemblages of natural and artificial tropical estuaries

Shift of algal community structure in dead end lagoons of the Delaware Inland Bays during seasonal anoxia

Beneficial use of dredged material for habitat creation, enhancement, and restoration in New York–New Jersey Harbor

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