2017
DOI: 10.3389/fmars.2017.00350
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Deep-Sea Mega-Epibenthic Assemblages from the SW Portuguese Margin (NE Atlantic) Subjected to Bottom-Trawling Fisheries

Abstract: Bottom-trawling fisheries are a common threat to the health of continental margins worldwide. Together with numerous environmental and biological processes, physical disturbance induced by trawlers can largely shape the benthic habitats and their associated assemblages. At the SW Portuguese Margin, crustacean bottom trawlers have exploited deep-sea habitats for a few decades, but its effects on the benthic biodiversity are practically unknown. During the spring-summer of 2013 and 2014, several Remotely Operate… Show more

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Cited by 9 publications
(7 citation statements)
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“…Differences in benthic faunal assemblage composition and diversity have been observed between locations subject to different trawling intensities (Hiddink et al, 2006;Ramalho et al, 2017). The degree of assemblage change has been linked to the frequency and / or intensity of disturbance (Rooper et al, 2011;van Denderen et al, 2015;Sorte et al, 2017).…”
Section: Potential Impact Of Demersal Fishingmentioning
confidence: 99%
“…Differences in benthic faunal assemblage composition and diversity have been observed between locations subject to different trawling intensities (Hiddink et al, 2006;Ramalho et al, 2017). The degree of assemblage change has been linked to the frequency and / or intensity of disturbance (Rooper et al, 2011;van Denderen et al, 2015;Sorte et al, 2017).…”
Section: Potential Impact Of Demersal Fishingmentioning
confidence: 99%
“…The shift in species size and traits toward smaller opportunistic taxa under conditions of disturbance also observed in mega-epibenthic taxa by Ramalho et al (2017) has been associated with a lower recovery capacity of sediment biogeochemical conditions, as mediation of macronutrients and carbon cycling was decoupled (Hale et al, 2017). In the present study, in addition to the differences in terms of traits of macrobenthos (both trophic, mean size, and respiration rates) between the two FG and AA stations, we have also observed significant differences in bacterial uptake rates and biogeochemical functions based on ammonium concentrations in sediments collected in these stations.…”
Section: Changes In Benthic Infauna and Associated Ecosystem Functionsmentioning
confidence: 69%
“…The adjacent area (AA) stations correspond to those that have been either undisturbed or subjected to very few trawl passages in time and space (st. 2 and st. 6; swept area ratio ranging between 0.32 and 0.93), but are adjacent to the main fishing ground (Figures 1B,C). This AA area presented overall very few and mostly eroded trawl scars during ROV video surveys (Ramalho et al, 2017). Fishing ground (FG) stations were located in the area where crustacean otter trawlers are typically fishing (st. 1, st. 4, and st. 7; swept area ratio ≥ 1.5) and video surveys detected a high number of apparently recent trawl scars on the seabed (Figures 1B,C; Ramalho et al, 2017).…”
Section: Sampling Strategy and Onboard Sample Processingmentioning
confidence: 99%
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