Experimental beam-trawling in Lanice conchilega reefs: Impact on the associated fauna

Rabaut, Marijn; Braeckman, Ulrike; Hendrickx, Frederik; Vincx, Magda; Degraer, S.

doi:10.1016/j.fishres.2007.10.009

Cited by 23 publications

(22 citation statements)

References 27 publications

(31 reference statements)

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“…Investigations by means of experimental trawling and empirical data showed that trawl fisheries increase the mortality of benthic species not caught in the nets but which are damaged by the passing gear (Bergman & van Santbrink, 2000;Mensink et al, 2000;Callaway et al, 2007;Rabaut et al, 2008). Moreover, fishing indirectly affects benthic communities by disturbing the sediment, altering seabed morphology, and increasing suspend solids in the water column (Watling, 2005), while individuals not killed may be left at the surface, increasing food availability for scavenging species (Frid et al, 1999).…”

Section: Discussionmentioning

confidence: 99%

Long-term changes in the spiny dogfish (Squalus acanthias) trophic role in the southwestern Atlantic

et al. 2011

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We used a comprehensive dataset on the diet of Squalus acanthias in the southwestern Atlantic Ocean (35-55°S) to test the hypothesis that fishery has caused a decrease in the trophic level of this species (fishing down process). Of 3,644 stomachs examined between the years 1985 and 2010, 2,214 (60.77%) contained prey items. Generalized linear models were used to evaluate the support in our data for five explanatory variables (sex, predator's total length, season, region and decade) that may explain the consumption of the given prey. The frequency of fish, mainly Merluccius hubbsi, and benthos in the stomachs decreased through time, whereas the squid Illex argentinus and jellyfishes exhibited positive trends. The trophic level of S. acanthias declined from the 1980s to the 1990s due to the high consumption of prey items at lower trophic levels. On the other hand, the consumption of argentine anchovy, Engraulis anchoita, an underexploited species, did not reveal changes through time.

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Section: Discussionmentioning

confidence: 99%

Long-term changes in the spiny dogfish (Squalus acanthias) trophic role in the southwestern Atlantic

et al. 2011

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“…The large tidal flats result from the extreme megatidal regime (tidal range up to 15.5 m during spring tides) which dominates the BMSM (Larsonneur et al 1994). Boulogne is characterized by a tidal range up to 7 m and in comparison to the BMSM, the beach of Boulogne is less pristine and sheltered by two harbour walls (Rabaut et al 2008). The L. conchilega reef is situated in the lower intertidal and the majority is only exposed during extreme mean low water spring tide conditions.…”

Section: Study Areamentioning

confidence: 99%

Biogenic reefs affect multiple components of intertidal soft-bottom benthic assemblages: the Lanice conchilega case study

Smet

D'Hondt

Verhelst

et al. 2015

Estuarine, Coastal and Shelf Science

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International audienceBiogenic reefs composed of the tube-building polychaete Lanice conchilega are important from a conservationpoint of view because they noticeably increase the biodiversity in otherwise species poorenvironments. However, up to now, little or no attention has been paid to the intertidal epi- andhyperbenthic communities associated with the reefs. Therefore, this is the first study which focuses onthe effect of L. conchilega reefs on the entire bentho-pelagic community at two different locations.Environmental variables were measured and macro-, epi- and hyperbenthic communities were sampledwithin a L. conchilega reef and a control area at two locations in France: the bay of the Mont Saint-Michel(BMSM) and Boulogne-sur-Mer (Boulogne). The effect of the reef presence on the benthic communitywas studied with a 3-factor (Reef, Location and Period) Permanova. In addition, the relationship betweenthe benthic community and the environmental variables was investigated using Distance-based linearmodels (DistLM). Most collected organisms were sampled in the reef area (macrobenthos: 91%, epibenthos:81% and hyperbenthos: 78.5%) indicating that, independent of the location, the L. conchilegareefs positively affect all three associated benthic communities. However, the extent of the effect seemsto be most pronounced for the macrobenthos and less distinct in case of the hyperbenthos. The macro-,and epibenthos are mainly structured by biotic variables (L. conchilega density and macrobenthic foodavailability respectively), while the hyperbenthos is rather structured by environmental variables. Ingeneral, L. conchilega reefs do not only affect abundances and diversity but they substantially steer thestructure of the intertidal benthic sandy beach ecosystem

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“…The author indicates, however, that trawling in the medium to long-term can have consequences for the integrity of the reefs in the event of intensive fishing. For L. conchilega, the reef structure itself appears to be relatively resistant to fisheries impact (Rabaut, 2009) while the associated reef fauna experience an immediate impact (Rabaut et al, 2008). In the event of intensive beam-trawling, the reef structure will eventually disappear (Rabaut, 2009).…”

Section: Sublittoral Polychaete Worm Reefs On Sediment (Eunis A561)mentioning

confidence: 99%

Assessment of goods and services, vulnerability, and conservation status of European seabed biotopes: a stepping stone towards ecosystem-based marine spatial management

et al. 2012

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The goal of ecosystem-based marine spatial management is to maintain marine ecosystems in a healthy, productive and resilient condition; hence, they can sustainably provide the needed goods and services for human welfare. However, the increasing pressures upon the marine realm threaten marine ecosystems, especially seabed biotopes, and thus a well-planned approach of managing use of marine space is essential to achieve sustainability. The relative value of seabed biotopes, evaluated on the basis of goods and services, is an important starting point for the spatial management of marine areas. Herein, 56 types of European seabed biotopes and their related goods, services, sensitivity issues, and conservation status were compiled, the latter referring to management and protection tools which currently apply for these biotopes at European or international level. Fishing activities, especially by benthic trawls, and marine pollution are the main threats to European seabed biotopes. Increased seawater turbidity, dredged sediment disposal, coastal constructions, biological invasions, mining, extraction of raw materials, shipping-related activities, tourism, hydrocarbon exploration, and even some practices of scientific research, also exert substantial pressure. Although some first steps have been taken to protect the European sea beds through international agreements and European and national legislation, a finer scale of classification and assessment of marine biotopes is considered crucial in shaping sound priorities and management guidelines towards the effective conservation and sustainability of European marine resources.

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Experimental beam-trawling in Lanice conchilega reefs: Impact on the associated fauna

Cited by 23 publications

References 27 publications

Long-term changes in the spiny dogfish (Squalus acanthias) trophic role in the southwestern Atlantic

Long-term changes in the spiny dogfish (Squalus acanthias) trophic role in the southwestern Atlantic

Biogenic reefs affect multiple components of intertidal soft-bottom benthic assemblages: the Lanice conchilega case study

Assessment of goods and services, vulnerability, and conservation status of European seabed biotopes: a stepping stone towards ecosystem-based marine spatial management

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