Evaluation of macrobenthic community responses to dredging through a multimetric approach: Effective or apparent recovery?

Piló, David; Carvalho, André N.; Pereira, Fábio; Coelho, H.E.; Gaspar, Miguel B.

doi:10.1016/j.ecolind.2018.08.064

Cited by 20 publications

(9 citation statements)

References 72 publications

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“…Dredging simplifies landscape heterogeneity by removing structurally complex terrain features (e.g. subtidal rocky structures), and this typically has negative impacts on species diversity via the local extirpation of sensitive species, and through the redistribution of mobile taxa to less modified areas of urban landscapes (Rehitha et al 2017;Pilo ´et al 2019). The homogenisation of coastal terrain features can, however, also favour species with diverse habitat requirements and broad diets (e.g.…”

Section: Discussionmentioning

confidence: 99%

“…The homogenisation of coastal terrain features can, however, also favour species with diverse habitat requirements and broad diets (e.g. sea gulls, sea bream, polychaetes) (Fuirst et al 2018;Pilo ´et al 2019;). These generalist taxa can rapidly colonise modified habitats, out-compete specialised species for resources, and thrive in modified landscapes and seascapes that also offer a reprieve from their natural predators (Ewers and Didham 2006;Estes et al 2011;Meng et al 2020).…”

Section: Discussionmentioning

confidence: 99%

“…The spatial distribution of these taxa is likely a response to the aforementioned effects of the cumulative stressors in dredged channels, but as all are zoobenthivores that feed in a range of habitats, it is also probably shaped by the diversity and abundance of epifaunal and infaunal invertebrates (e.g. molluscs, crustaceans, worms) that are common in the soft sediments, shallow rock bars and fringing urban structures of highly modified estuaries (Rehitha et al 2017;Pilo ´et al 2019;.…”

Section: Discussionmentioning

confidence: 99%

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Dredging fundamentally reshapes the ecological significance of 3D terrain features for fish in estuarine seascapes

et al. 2022

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Context Landscape modification alters the condition of ecosystems and the structure of terrain, with widespread impacts on biodiversity and ecosystem functioning. Seafloor dredging impacts a diversity of flora and fauna in many coastal landscapes, and these processes also transform three-dimensional terrain features. The potential ecological significance of these terrain changes in urban seascapes has, however, not been investigated. Objectives We examined the effects of terrain variation on fish assemblages in 29 estuaries in eastern Australia, and tested whether dredging changes how fish associate with terrain features. Methods We surveyed fish assemblages with baited remote underwater video stations and quantified terrain variation with nine complementary metrics (e.g. depth, aspect, curvature, slope, roughness), extracted from bathymetry maps created with multi-beam sonar. Results Fish diversity and abundance were strongly linked to seafloor terrain in both natural and dredged estuaries, and were highest in shallow waters and near features with high curvature. Dredging, however, significantly altered the terrain of dredged estuaries and transformed the significance of terrain features for fish assemblages. Abundance and diversity switched from being correlated with lower roughness and steeper slopes in natural estuaries to being linked to features with higher roughness and gentler slopes in dredged estuaries. Conclusions Contrasting fish-terrain relationships highlight previously unrecognised ecological impacts of dredging, but indicate that plasticity in terrain use might be characteristic of assemblages in urban landscapes. Incorporating terrain features into spatial conservation planning might help to improve management outcomes, but we suggest that different approaches would be needed in natural and modified landscapes.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Dredging fundamentally reshapes the ecological significance of 3D terrain features for fish in estuarine seascapes

et al. 2022

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“…Pilo, Carvalho, Pereira, Coelho, and Gaspar (2019) evaluated dredging effects on macrobenthic communities of the Ria Formosa coastal lagoon, Portugal, using the difference in species composition between local and regional assemblages (beta diversity), partitioned into turnover (species replacement) and nestedness (species lost), in conjunction with multivariate analyses and benthic ecological status assessment (AMBI and M‐AMBI); the authors found that combined uni‐ and multivariate analysis including detailed beta‐diversity information may be an effective approach to identify the effects of dredging on benthic communities.…”

Section: Assessment Methods and Pollution Indicatorsmentioning

confidence: 99%

Effects of pollution on marine organisms

Mearns

Morrison

Arthur³

et al. 2020

Water Environment Research

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This review covers selected 2019 articles on the biological effects of pollutants, including human physical disturbances, on marine and estuarine plants, animals, ecosystems, and habitats. The review, based largely on journal articles, covers field, and laboratory measurement activities (bioaccumulation of contaminants, field assessment surveys, toxicity testing, and biomarkers) as well as pollution issues of current interest including endocrine disrupters, emerging contaminants, wastewater discharges, marine debris, dredging, and disposal. Special emphasis is placed on effects of oil spills and marine debris due largely to the 2010 Deepwater Horizon oil blowout in the Gulf of Mexico and proliferation of data on the assimilation and effects of marine debris microparticulates. Several topical areas reviewed in the past (e.g., mass mortalities ocean acidification) were dropped this year. The focus of this review is on effects, not on pollutant sources, chemistry, fate, or transport. There is considerable overlap across subject areas (e.g., some bioaccumulation data may be appeared in other topical categories such as effects of wastewater discharges, or biomarker studies appearing in oil toxicity literature). Therefore, we strongly urge readers to use keyword searching of the text and references to locate related but distributed information. Although nearly 400 papers are cited, these now represent a fraction of the literature on these subjects. Use this review mainly as a starting point. And please consult the original papers before citing them.

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“…Benthic communities are directly affected by reclamation and dredging activities. Consequently, macrobenthic communities are widely used as an important bioindicator to monitor and assess changes in estuarine and marine environments due to coastal modification in many parts of the world [31][32][33][34][35][36]. However, the use of macrobenthic invertebrates to assess the extent of environmental impacts associated with dredging and reclamation activities on coastal and marine ecosystems has been limited in the Arabian Gulf [37,38].…”

Section: Introductionmentioning

confidence: 99%

Community Structures of Benthic Macrofauna in Reclaimed and Natural Intertidal Areas in Bahrain, Arabian Gulf

Naser¹

2022

JMSE

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Costal reclamation has been carried out extensively along the coastlines of the Arabian Gulf during the last decades. As a small archipelago country, coastal reclamation continues to be a major option for securing land to meet the needs of the expanding population and economic development in Bahrain. Macrobenthic communities often reflect the integrity of ecosystems as they respond to natural and anthropogenic stressors. This study characterized the community structures of macrobenthic invertebrates in three reclaimed intertidal areas and a protected natural mudflat in Bahrain (August 2019 and December 2020). Macrobenthic community structures and sediment characteristics differed significantly between natural and reclaimed areas. A total of 43 species were recorded in the four study areas, of which 38 were collected from the natural mudflat. Polychaetes dominated macrobenthic communities, followed by molluscs and crustaceans. Polychaetes accounted for more than 90% of the communities in the reclaimed coastal areas. Macrobenthic monitoring is considered essential for detecting changes in coastal and marine ecosystems due to dredging and reclamation activities along the coastlines of the Arabian Gulf. The findings of this study can provide insights into the ecological dynamics of macrobenthic communities in reclaimed coastal areas for environmental monitoring and coastal planning and management in the Arabian Gulf.

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Evaluation of macrobenthic community responses to dredging through a multimetric approach: Effective or apparent recovery?

Cited by 20 publications

References 72 publications

Dredging fundamentally reshapes the ecological significance of 3D terrain features for fish in estuarine seascapes

Dredging fundamentally reshapes the ecological significance of 3D terrain features for fish in estuarine seascapes

Effects of pollution on marine organisms

Community Structures of Benthic Macrofauna in Reclaimed and Natural Intertidal Areas in Bahrain, Arabian Gulf

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