Structural and functional shifts in zoobenthos induced by organic enrichment — Implications for community recovery potential

Villnäs, Anna; Perus, Jens; Bonsdorff, Erik

doi:10.1016/j.seares.2010.06.004

Cited by 55 publications

(21 citation statements)

References 42 publications

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“…The resulting overall enrichment stage (ES) remained clearly higher than for the reference areas (ES 2.8 compared with ES 1.7 for the reference site). This is consistent with a number of other studies which have shown short-medium-term recovery in some variables (particularly geochemical) but distinct differences in ecological composition after similar timeframes (Karakassis et al, 1999;Macleod et al, 2004;Villnas et al, 2011). Such large shifts in S, N and in taxa composition were well captured by the diversity measures and biotic indices, which all indicated highly impacted conditions for the first year and moderately impacted conditions thereafter.…”

Section: Recovery Processessupporting

confidence: 91%

Benthic recovery and re-impact responses from salmon farm enrichment: Implications for farm management

2015

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Section: Recovery Processessupporting

confidence: 91%

Benthic recovery and re-impact responses from salmon farm enrichment: Implications for farm management

2015

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“…Once the ecosystem is altered by nutrient over-enrichment, the nature of buffering processes is altered and hence difficult to re-establish (Kemp et al 2005a, b). Degradation and recovery therefore typically follow different non-linear pathways or trajectories (Munkes 2005;Kemp et al 2009;Villnäs et al 2011), with only few examples of full recovery (Greening et al 2011;Carstensen et al 2013). …”

Section: Introductionmentioning

confidence: 99%

Recovery of Danish Coastal Ecosystems After Reductions in Nutrient Loading: A Holistic Ecosystem Approach

Riemann

Carstensen

Dahl

et al. 2015

Estuaries and Coasts

195

146

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In the 1980s, Danish coastal waters suffered from eutrophication and several nutrient management plans have been implemented during the years to improve ecological status. This study aims at giving a holistic ecosystem perspective on 25 years of mitigation measures. We report trends of nutrient inputs and the responses to these in various chemical and biological components. Nutrient inputs from land were reduced by~50 % for nitrogen (N) and 56 % for phosphorus (P) since 1990. These reductions resulted in significant and parallel declines in nutrient concentrations, and initiated a shift in the dominance of primary producers towards reduced phytoplankton biomass (chlorophyll a concentration) and increased cover of macroalgae in deeper waters. In the last 5 years, eelgrass meadows have also expanded towards deeper waters, in response to improving water clarity. An expected improvement of bottom water oxygen conditions has not been observed, presumably because more frequent stratification and higher water temperatures have counteracted the expected positive effects of reduced nutrient inputs. The biomass of the benthic macrofauna decreased as expected, but it was composed of a drastic decline of filter feeders paralleled by a more moderate increase of deposit feeders. This shift was most likely induced by increasing stratification. The reduced benthic filtration along with the limited eelgrass cover probably kept relatively more particles in suspension, which can explain why improvements in the Secchi depths were modest. Overall, several ecosystem components demonstrated clear signs of improvement, suggesting that at least partial recovery is attainable. On this basis, we propose a conceptual scheme for recovery of shallow coastal ecosystems following marked reductions in nutrient inputs.

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“…The underlying concept of functional diversity is based on functional traits, which are defined as biological and ecological attributes that influence the performance ( e.g . swimming, foraging, reproduction aspects) of an organism (Villnäs et al, ). Previous studies have shown that functional diversity is a better predictor of many ecosystem processes than species richness (Lombarte et al, ) or taxonomic diversity (Mouillot et al, ).…”

Section: Introductionmentioning

confidence: 99%

Vertical zonation and functional diversity of fish assemblages revealed by ROV videos at oil platforms in The Gulf

Torquato

Jensen

Range

et al. 2017

Journal of Fish Biology

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An assessment of vertical distribution, diel migration, taxonomic and functional diversity of fishes was carried out at offshore platforms in The (Arabian-Iranian-Persian) Gulf. Video footage was recorded at the Al Shaheen oil field between 2007 and 2014 using a remotely operated vehicle (ROV). A total of 12 822 individual fishes, from 83 taxonomic groups were recorded around the platforms. All the species identified are considered native to The Gulf, although Cyclichthys orbicularis and Lutjanus indicus were recorded for the first time in Qatari waters. Several trends were uncovered in the vertical distribution of the fish community; most species were observed between 20 and 50 m depth and fish abundance decreased towards the bottom, with the highest abundances recorded in the upper layers, i.e. down to 40 m depth. Vertical variation in fish diversity, however, was generally not accompanied by differences in vertical movements. Carnivores and invertivores were the dominant trophic groups, being found at each depth range from surface to seabed. The functional indices showed no significant differences between water depths or diel cycles. The study demonstrates that oil platforms represent a hotspot of fish diversity and interesting sites for studying fish communities, abundance and behaviour.

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Structural and functional shifts in zoobenthos induced by organic enrichment — Implications for community recovery potential

Cited by 55 publications

References 42 publications

Benthic recovery and re-impact responses from salmon farm enrichment: Implications for farm management

Benthic recovery and re-impact responses from salmon farm enrichment: Implications for farm management

Recovery of Danish Coastal Ecosystems After Reductions in Nutrient Loading: A Holistic Ecosystem Approach

Vertical zonation and functional diversity of fish assemblages revealed by ROV videos at oil platforms in The Gulf

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