Vertical migration and mortality of benthos in dredged material: Part III—polychaeta

Maurer, Don; Keck, Richard T.; Tinsman, Jeff C.; Leathem, Wayne

doi:10.1016/0141-1136(82)90007-1

Cited by 43 publications

(14 citation statements)

References 12 publications

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“…Species differ greatly in their tolerance of burial (e.g. Maurer et al 1982), but suspension feeding bivalves, such as Corbula cf. coxi, are generally unable to escape burial of more than 5 cm (Kranz 1974) and also appear sensitive to high rates of sedimentation (e.g.…”

Section: Discussionmentioning

confidence: 99%

Effects of scallop dredging on a soft sediment community:a large-scale experimental study

Dr¹,

Gd²

1996

Mar. Ecol. Prog. Ser.

148

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Changes to benthic infauna caused by scallop dredging at a site in Port Phillip Bay, southeastern Australia, were examined experimentally using a BACl (before, after, control, impact) design. The experimental dredging was undertaken by commercial fishermen and was typical of normal commercial operations in its spatial extent, intensity and duration Changes to benthic community structure following dredging were monitored using grab samples taken on 3 occasions pre-dredging and 6 occasions post-dredging. The significance of changes was assessed using ANOVA for the more abundant species and, for pooled groups of species, Bray-Curtis community dissimilarities and multidimensional scaling (MDS). The abundance of 7 of the 10 most common species changed significantly (ANOVA p < 0.10) after dredging; 6 species decreased in abundance while 1 species increased. The size and persistence of dredging impacts varied between species, but most species decreased in abundance by 20 to 30%. Dredging impacts became undetectable for most species following their next recruitment. Most species recruited within 6 mo of the dredging impact, but a small number of species still had not recruited after 14 mo. These latter species appeared to cause a persistent change in community structure which was still detectable after 14 mo using Bray-Curtis dissimilarities. MDS ordination indicated that changes to community structure caused by dredging were smaller than those that occur between seasons and years.

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Section: Discussionmentioning

confidence: 99%

Effects of scallop dredging on a soft sediment community:a large-scale experimental study

Dr¹,

Gd²

1996

Mar. Ecol. Prog. Ser.

148

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“…Lack of faunal effects of sedimentation by natural particles has also been observed in previous studies (e.g. Jackson & James 1979, Maurer et al 1982, Bellchambers & Richardson 1995, Smith & Rule 2001. Thus, the burial component of faunal effects of water-based drill cuttings should in our view be scaled down, while other impact factors should be investigated further.…”

Section: Impact Mechanisms Of Drill Cuttingsmentioning

confidence: 99%

Biological and biogeochemical effects of organic matter and drilling discharges in two sediment communities

Trannum¹,

Nilsson²,

Schaanning³

et al. 2011

Mar. Ecol. Prog. Ser.

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The present study investigates the relation between community characteristics, input of organic matter and drill cuttings. Drill cuttings are discharged from offshore oil and gas exploration, and settle on soft bottom sediments where the benthic fauna may be affected. In a 3-factorial mesocosm experiment, 2 benthic communities were treated with either water-based drill cuttings or natural sediment in combination with addition or no addition of organic matter, and biochemical and biological responses were studied. The biogeochemical response of organic matter and drill cuttings additions resembled each other, in both cases resulting in enhanced sediment-water fluxes of oxygen, nitrate and ammonium, and reduced concentration of oxygen in sediment pore water. This finding indicated degradation of an organic compound in the water-based drill cuttings. Regarding the biological response, benthic community composition was significantly different for all treatment factors, evidenced by PERMANOVA. Abundance and biomass were reduced in boxes without addition of organic matter, probably as a response to starvation, while abundance and taxa richness were reduced in boxes with drill cuttings. The particular effect of water-based drill cuttings on the environment seems to be complex, and should be investigated further. KEY WORDS: Benthos · Biogeochemical fluxes · Oil exploration · Organic matter · Oxygen microdistributions · Water-based drilling mud Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 442: [23][24][25][26][27][28][29][30][31][32][33][34][35][36] 2011 mental impacts around drilling installations using oilbased and synthetic muds (e.g. Kingston 1987, Neff et al. 1987, Gray et al. 1990, Olsgard & Gray 1995, Daan & Mulder 1996, the use of water-based drilling muds has increased and is currently considered the less environmentally harmful alternative. Waterbased drill cuttings (crushed bed rock mixed with drilling muds) have been considered to have minor or no negative impact on the marine environment except burial (e.g. Hyland et al. 1994, Currie & Isaacs 2005, Netto et al. 2010. However, recent studies have indicated that the effects may be more severe than previously assumed, and that impact factors other than burial trigger the response (Schaanning et al. 2008, Trannum et al. 2010. In light of possible expansion of drilling activities to pristine areas further north and in more coastal, shallow areas, we need to increase our knowledge of the generality of benthic responses.Benthic community composition varies across all spatial scales, but common environmental drivers include sediment characteristics, depth, input of organic matter and temperature (e.g. Gray 1974, Rhoads 1974, Grebmeier et al. 1988, Etter & Grassle 1992, Ambrose & Renaud 1995, Ellingsen 2002, Quijón et al. 2008, Li et al. 2009). A general problem in ecological monitoring is the differentiation of anthropogenic-induced changes from the natural variations constantly occurring in marine comm...

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“…Maurer et al (1981a, b;1982), through laboratory experiments with mollusk, crustacean, and polychaete species concluded that under certain conditions vertical migration can be a viable mechanism for recolonizing a dredgedumping site.…”

Section: Discussionmentioning

confidence: 99%

Effects of dredged sediment disposal on the coastal marine macrobenthic assemblage in Southern Brazil

2006

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The aim of this study was to evaluate the deposition impact of dredged material from Patos lagoon estuary on a benthic macroinvertebrate assemblage structure in an adjacent coastal marine area. Nine sampling stations were chosen at random in the disposal area, and nine others in the same way in an adjacent control area. Samples were collected at a 19 m depth before sediment disposal (11 July 2000), during dredging and disposal operations (25 Oct. 2000), and three months thereafter (24 Aug. 2001). Statistical analysis indicated that sampling periods presented similar characteristics in both the control and disposal sites. Disposal of dredged sediment from Patos lagoon had no detectable detrimental effects upon macrobenthic faunal assemblage at the dumping site. This result is attributed both to adaptation of resident biota to dynamic sedimentary conditions and to the fine estuarine sediment dredged, the dispersion of which in the water column might have minimized sediment deposition and consequent damage to the benthic fauna.Keywords: dredge, environmental impact, Patos lagoon, coastal zone. resumo efeitos da deposição de material proveniente de dragagem sobre uma associação de macroinvertebrados bentônicos na zona costeira do sul do brasilObjetivou-se avaliar o impacto da deposição de material dragado proveniente da região estuarina da lagoa dos Patos sobre a estrutura da associação macrobentônica no sítio de deposição, situado no ambiente marinho costeiro adjacente à desembocadura da laguna. Nove estações de coleta foram sorteadas, tanto no sítio de deposição quanto na área controle adjacente. As amostras, a 19 m de profundidade, foram coletadas antes do início de deposição do sedimento (11/07/2000), durante as operações de dragagem e deposição (25/10/2000) e três meses após o encerramento das atividades de deposição do material dragado (24/08/2001). Análises estatísticas indicaram que áreas controle e sítio de deposição apresentaram características faunísticas similares dentro dos períodos amostrais. Não foram detectados efeitos prejudiciais da deposição do sedimento sobre a associação de macroinvertebrados bentônicos na área de depósito. Este resultado pode ser atribuído às características da biota residente que está, provavelmente, adaptada às condições da dinâmica sedimentar do local e também às características predominantemente finas do sedimento dragado que, ao dispersar-se na coluna d´água, minimizaram a deposição das frações mais finas e um eventual dano ao macrozoobentos.Palavras-chave: dragagem, impacto ambiental, lagoa dos Patos, zona costeira.

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Vertical migration and mortality of benthos in dredged material: Part III—polychaeta

Cited by 43 publications

References 12 publications

Effects of scallop dredging on a soft sediment community:a large-scale experimental study

Effects of scallop dredging on a soft sediment community:a large-scale experimental study

Biological and biogeochemical effects of organic matter and drilling discharges in two sediment communities

Effects of dredged sediment disposal on the coastal marine macrobenthic assemblage in Southern Brazil

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