Pulse fishing and its effects on the marine ecosystem fisheries : an update of the scientific knowledge

Rijnsdorp, A.D.; Haan, D. de; Smith, Sarah; Strietman, W.J.

doi:10.18174/405708

Cited by 4 publications

(6 citation statements)

References 15 publications

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“…Furthermore, these approaches assume that the effects of trawling are always negative, while we show that if ecological feedbacks are as important as we have here assumed them to be, the net effect may be an increase in biomass. In frameworks based on community means such as longevity (Rijnsdorp et al., 2016), positive effects on biomass could even cancel out negative effects on biomass. This creates the risk that simultaneous strong positive and strong negative effects of bottom trawling would lead to an indicator falsely showing “no effect.” These large potential consequences warrant further consideration of ecological feedbacks in developing management indicators.…”

Section: Discussionmentioning

confidence: 99%

“…(2014), Mangano et al. (2017), Rijnsdorp, de Haan, Smith, and Strietman (2016), Tillin et al. (2006)).…”

Section: Introductionmentioning

confidence: 99%

“…While the potential food web effects of fisheries have long been acknowledged (Jennings & Kaiser, 1998), theoretical studies focusing on the ecosystem effects of bottom trawling have generally interpreted their results as direct effects of the trawling gears (e.g. Mangano et al (2014), Mangano et al (2017), Rijnsdorp, de Haan, Smith, and Strietman (2016), Tillin et al (2006)). A few theoretical studies did incorporate specific food web effects.…”

Section: Introductionmentioning

confidence: 99%

“…We analyse a model of a benthic food web consisting of invertebrate benthic predators, filter feeders and deposit feeders (Figure 1). These functional groups are present and dominant in abundance and biomass in the most, if not all, soft‐bottom benthic ecosystems (Bolam, Coggan, Eggieton, Diesing, & Stephens, 2014; Mangano et al., 2014; Pearson, 2001) and are used to describe changes of food web functioning in relation to disturbance such as trawling (Rijnsdorp et al., 2016). The benthic predators feed on filter feeders and deposit feeders, while the latter two compete for resources.…”

Section: Introductionmentioning

confidence: 99%

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Food web feedbacks drive the response of benthic macrofauna to bottom trawling

Wolfshaar¹,

Denderen²,

Schellekens³

et al. 2020

Fish and Fisheries

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Bottom trawl fisheries have significant effects on benthic habitats and communities, and these effects have been studied intensively in the last decades. Most of these studies have related the changes in benthic community composition to direct effect of trawl gears on benthos, through imposed mortality. This line of argumentation ignores the fact that benthic organisms themselves form a complex food web and that bottom trawling may trigger secondary effects through this food web. We studied the potential consequences of such food web effects using a model of benthic predators, filter feeders, deposit feeders and fish. Our analysis shows how inclusion of ecological interactions complicates the relationship between bottom trawling intensity and the state of the benthic community and causes a non‐linear and non‐monotonic response of the benthic community to trawling. This shows that indirect food web effects can fundamentally alter the response of a benthic ecosystem to bottom trawling, compared to the direct effects of mortality. In light of our results, we argue that indicators of fishing impact on benthos need to account for positive as well as negative effects of bottom trawling, in order to accurately quantify the impact. Our findings highlight that understanding the food web ecology of the benthic ecosystem is crucial for understanding and predicting the effects of trawling on the seafloor. Work that promotes such understanding of the food web ecology seems a more productive research strategy than conducting ever more empirical trawling effect measurements.

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Section: Discussionmentioning

confidence: 99%

“…(2014), Mangano et al. (2017), Rijnsdorp, de Haan, Smith, and Strietman (2016), Tillin et al. (2006)).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Food web feedbacks drive the response of benthic macrofauna to bottom trawling

Wolfshaar¹,

Denderen²,

Schellekens³

et al. 2020

Fish and Fisheries

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show abstract

“…Recent experiments, however, have not been able to support the latter. In a synthesis of all available evidence Rijnsdorp et al (2016) concluded that "It is uncertain whether the pulse trawl has a better size selectivity (reduced bycatch of undersized fish), but all experiments show that the bycatch of benthic invertebrates is substantially reduced". 2 "Large cod (34-56 cm) are particularly susceptible to spinal damage while cod of 11-17 cm do not appear to suffer to the same degree or indeed at all .…”

Section: Morning Sessionmentioning

confidence: 99%