Effects of bottom trawling and primary production on the composition of biological traits in benthic assemblages

Howarth, LM; Waggitt, James J.; Bolam, S.G.; Eggleton, J.D.; Somerfield, PJ; Hiddink, JG

doi:10.3354/meps12690

Cited by 13 publications

(18 citation statements)

References 80 publications

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“…This study analyses a dataset described by Howarth et al (2018b) and available from (Howarth et al 2018a). In brief, trawling intensity (quantified as the swept-area-ratio, SAR (y -1 ), from Vessel Monitoring Systems data) and primary production (PP, mg C m -2 yr -1 , estimated by the MODIS satellite sensor) for the United Kingdom were divided into four categories (divided at equal intervals on a log scale for trawling intensities, and equal intervals on a natural scale for PP, Table 1).…”

Section: Samplingmentioning

confidence: 99%

“…A retrospective multivariate analysis of the environmental variables at the sampling stations indicated that the environmental conditions at two stations were dissimilar to the others based on their sediment particle size distribution (with very low and very high mean sediment particle sizes respectively). These were excluded from further analyses (details in Howarth et al 2018b). Hence, data are missing for the combination of low trawling and moderately high primary production.…”

Section: Samplingmentioning

confidence: 99%

“…A normalized size spectrum converts the biomasses to densities by dividing them by the width of the body mass classes (Sprules et al 2016). Abundance and biomass values for the 2m and 4m beam trawls were scaled to account for differences in sampling area and efficiency compared to the Day grab (for which we assumed 100% of the fauna from 0.1 m 2 was collected) as described in Howarth et al (2018b). The scaling was based on the assumption that log 10 normalised biomass in the body mass categories that overlap between the sampling gears are continuous.…”

Section: Samplingmentioning

confidence: 99%

“…(R Development Core Team 2011). Sources: Base map, European Environment Agency 2015; Primary production, MODIS satellite sensor provided by NEODAAS, see Howarth et al (2018b); Trawling intensity from Eigaard et al (2016), see Howarth et al (2018b). .…”

Section: Data Accessibilitymentioning

confidence: 99%

“…These drivers rarely operate in isolation, and their interactions can generate unexpected ecological responses (Crain et al 2008). For example, a recent study found that higher levels of primary production make benthic ecosystems more resilient to bottom trawling impacts (Hiddink et al 2017), and that the effects of bottom trawling on the trait composition of benthos are greater in areas of high primary production (Howarth et al 2018b). Hence, there is a need to better understand how marine ecosystems react to multiple drivers (Fu et al 2018).…”

Section: Introductionmentioning

confidence: 99%

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The effects of trawling and primary production on size-structured food webs in seabed ecosystems

Howarth

Somerfield

Blanchard

et al. 2020

Can. J. Fish. Aquat. Sci.

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Understanding how different drivers shape relationships between abundance and body mass (size-spectra) is important for understanding trophic and competitive interactions in food webs, and for predicting the effects of human pressures. Here, we sample seabed communities from small polychaetes (< 0.001g) to large fish (> 1kg) in the Celtic Sea to examine how bottom trawling and primary production affect their size spectra, and to compare these to predictions from a model that couples predator and detritivore communities. Size spectra were not well approximated by linear fits because of truncation of the size spectra of detritivores. Low primary production resulted in lower abundance of benthic fauna. Bottom trawling reduced the abundance of predators and large detritivores, but allowed small detritivores to increase in abundance. These empirical size spectra were partly consistent with predictions from the size spectra model, showing that understanding the structuring of benthic communities requires a consideration of both size and functional group. The findings highlight the need for an ecosystem approach to understanding the effects of exploitation and climate change on marine ecosystems.

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Section: Samplingmentioning

confidence: 99%

Section: Samplingmentioning

confidence: 99%

Section: Samplingmentioning

confidence: 99%

Section: Data Accessibilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The effects of trawling and primary production on size-structured food webs in seabed ecosystems

Howarth

Somerfield

Blanchard

et al. 2020

Can. J. Fish. Aquat. Sci.

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Effects of pollution on marine organisms

Mearns

Bissell

Morrison

et al. 2019

Water Environment Research

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This review covers selected 2018 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. 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 appear 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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Impacts of bottom trawling on benthic biogeochemistry in muddy sediments: Removal of surface sediment using an experimental field study

Morys

Brüchert

Bradshaw

2021

Marine Environmental Research

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Effects of bottom trawling and primary production on the composition of biological traits in benthic assemblages

Abstract: 12

Cited by 13 publications

References 80 publications

The effects of trawling and primary production on size-structured food webs in seabed ecosystems

The effects of trawling and primary production on size-structured food webs in seabed ecosystems

Effects of pollution on marine organisms

Impacts of bottom trawling on benthic biogeochemistry in muddy sediments: Removal of surface sediment using an experimental field study

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