Dredging impact on an urbanized Florida bayou: effects on benthos and algal-periphyton

Effects of sediment dredging on water quality and zooplankton community structure in a shallow of eutrophic lake

“…Therefore, the amount of organic matter mineralization decreased post-dredging. Lewis et al (2001) determined the impacts of hydraulic dredging on an urbanized estuary, and found that the effects on surface water pH, DO and temperature were negligible, but photosynthetically active radiation was decreased at several stations. A similar trend was found in this study.…”

“…But most of the previous studies related to effects of dredging on water quality, release of nutrients and heavy metals, benthos, algal-periphyton, bacteria, larval zooplankton, birds and aquatic plants (Brookes, 1987;DeCoursey and Vernberg, 1975;Howarth et al, 1982;Lewis et al, 2001;Lohrer and Wetz, 2003;Nayar et al, 2004;Spencer et al, 2006). Information on the effects of dredging on zooplankton community structure is rare but also inconsistent (Wang et al, 2005;Li et al, 2007;Wu et al, 2008).…”

Increased Bioavailability of Mercury in the Lagoons of Lomé, Togo: The Possible Role of Dredging

“…Several reports have been published on the effect of dredging coastal or estuarine sediment on the toxicity and bioavailability of trace metals, and both positive and negative outcome have been reported (Bloom and Lasorsa 1999;Guerra et al 2009;Lee et al 1982;Lewis et al 2001). Examples of positive results are (1) plant uptake of Cd and Zn was lowered when dredged sediments were deposited in reduced (flooded) environments (Lee et al 1982); (2) trace metal concentrations (e.g., Zn, Cr, and Hg) in periphyton were decreased after the dredging activity of estuarine sediments for Zn, Hg, and Cr (Lewis et al 2001); and (3) dredging activity of a coastal lagoon had no dramatic effect (based on a before/ after comparison) on Hg concentration and sediment toxicity (Guerra et al 2009).…”

Turbidity and Other Effects Resulting from Trafalgar Sandbank Dredging and Palmar Beach Nourishment

“…The location of monitoring stations was taken into account when designing the fieldwork plan. It is evident that the number of sampling stations, the type and frequency of chemical analysis, and the media analyzed are important considerations even for small-scale dredging events (Lewis et al 2001). …”

“…Physical and chemical changes may be produced during and after dredging and dumping of the dredged material (Herbich 1992). The reported effects include increased turbidity, the reduction of primary productivity, and changes in the structural characteristics of plant communities (Lewis et al 2001). In this context, several studies have been conducted elsewhere to determine dredging effects on aquatic flora such as seagrasses (Onuf 1994;Long et al 1996), seaweeds (Lyngby and Mortensen 1996), and phytoplankton (Iannuzzi et al 1996).…”