Journal ArticleDOI
The impact of dredging on macrobenthic invertebrates in a tributary of the Warri River, Niger delta
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The macrobenthic invertebrates of a canal, created from a tributary of the Warri River in the mangrove swamp of the Niger Delta, Nigeria, were studied before and after dredging, finding a drastic reduction of benthic species.Abstract:
The macrobenthic invertebrates of a canal, created from a tributary of the Warri River in the mangrove swamp of the Niger Delta, Nigeria, were studied before and after dredging. In the canal dredging resulted in at least a 93% decrease in the benthic population while the Margalef's diversity index reduced from 3.8 to 1.4. Of the 15 species identified during the pre-dredging studies, only Nereis operta and Baetis sp. were recovered after dredging. The site 500m downstream of the canal was also slightly impacted, showing a 31% decrease in population. We conclude that the drastic reduction of benthic species is due to the direct destruction of benthic species, larvae and habitat, as well as settling turbidity plumes, reduction of sediment nutrients, physical disturbance and, physiological and toxic stress. To conserve biodiversity it is recommended that mitigation measures should be put in place by stakeholders involved in dredging and that long-term monitoring of dredged canals is carried out to ensure that...read more
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Influence of technical maintenance measures on ecological status of agricultural lowland rivers - Systematic review and implications for river management.
TL;DR: It is concluded that day-to-day management of lowland agricultural rivers requires revision in terms of compliance with environmental conservation requirements and the recurrent implementation of technical measures for river maintenance.
Journal ArticleDOI
Review of Impact of Anthropogenic Activities in Surface Water Resources in the Niger Delta Region of Nigeria: A Case of Bayelsa State
TL;DR: In this paper, the impacts of anthropogenic activities in surface water resources in Bayelsa state, Nigeria is reviewed. And the authors suggest that factors leading to alteration in water quality should be checkmated by appropriate regulatory agencies.
Journal ArticleDOI
Guide to Identification of Marine and Estuarine Invertebrates. Cape Hatteras to the Bay of Fundy.Kenneth L. Gosner
Journal ArticleDOI
The impact of dredging of a small lowland river on water beetle fauna (Coleoptera)
Piotr Dabkowski,Paweł Buczyński,Andrzej Zawal,Edyta Stępień,Edyta Buczyńska,Robert Stryjecki,S Czachorowski,P. Smietana,Magdalena Szenejko +8 more
TL;DR: After dredging the aquatic beetle fauna became markedly poorer quantitatively and had lower species diversity, but species number and diversity increased rapidly and were restored within just half a year.
References
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Journal ArticleDOI
The effects of experimental scallop dredging on the fauna and physical environment of a shallow sandy community
A. Eleftheriou,M.R. Robertson +1 more
TL;DR: The overall conclusion to be drawn from this experimental dredging operation is that its effect was limited tot he selective elimination of a fraction of the fragile and sedentary components of the infauna, and the destruction of the large epifaunal and infaunal organisms.
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The effects of marine gravel extraction on the macrobenthos: Results 2 years post-dredging
Andrew Kenny,H.L. Rees +1 more
TL;DR: An offshore experimental dredging study was initiated off North Norfolk (UK) in 1992 to investigate the impacts of marine gravel extraction on the macrofauna as mentioned in this paper, and the results indicated that whilst the dominant species recolonized quickly following dredging many rarer species did not.
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Physical disturbance and marine benthic communities : the effects of mechanical harvesting of cockles on non-target benthic infauna
TL;DR: It is concluded that mechanical harvesting methods impose high levels of mortality on nontarget benthic fauna, but that recovery of disturbed sites is rapid and the overall effects on populations is probably low.
Journal ArticleDOI
The subsidiary impacts of dredging (and trawling) on a subtidal benthic Molluscan community in the Southern Waters of Hong Kong
TL;DR: It is postulates that setting silt plumes associated with dredging activity have exacerbated the problems of a sea-bed already disturbed as a result of trawling and pollution.