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Trophic signatures of small-scale fishing gears: implications for conservation and management

2007Journal article Open access
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dc.contributor.authorStergiou, Konstantinos
dc.contributor.authorMoutopoulos, D. K.
dc.contributor.authorCasal, H. J. A.
dc.contributor.authorErzini, Karim
dc.date.accessioned2016-12-14T16:22:31Z
dc.date.available2016-12-14T16:22:31Z
dc.date.issued2007
dc.description.abstractWe quantified the ecosystem effects of small-scale gears operating in southern European waters (Portugal, Spain, Greece), based on a widely accepted ecosystem measure and indicator, the trophic level (TL). We used data from experimental fishing trials during 1997 to 2000. We studied a wide range of gear types and sizes: (1) gill nets of 8 mesh sizes, ranging from 44 to 80 mm; (2) trammel nets of 9 inner panel mesh sizes, ranging from 40 to 140 mm; and (3) longlines of 8 hook sizes, ranging from Nos. 15 (small) to 5 (large). We used the number of species caught per TL class for constructing trophic signatures (i.e. cumulative TL distributions), and estimated the TL at 25, 50 and 75% cumulative frequency (TL25, TL50, TL75) and the slopes using the logistic function. We also estimated the mean weighted TL of the catches (TLW). Our analyses showed that the TL characteristics of longlines varied much more than those of gill and trammel nets. The longlines of large hooks (Nos. 10, 9, 7, 5) were very TL selective, and their trophic signatures had very steep slopes, the highest mean TL50 values, very narrow mean TL25 to TL75 ranges and mean TLW > 4. In addition, the mean number of TL classes exploited was smaller and the mean TL50 and TLW were larger for the longlines of small hooks (Nos. 15, 13, 12, 11) in Greek than in Portuguese waters. Trammel and gill nets caught more TL classes, and the mean slopes of their trophic signatures were significantly smaller than those of longlines as a group. In addition, the mean number of TL classes exploited, the mean TL50 and the TLW of gill nets were significantly smaller than those of trammel nets. We attribute the differences between longlines of small hooks to bait type, and the differences between all gear types to their characteristic species and size-selectivity patterns. Finally, we showed how the slope and the TL50 Of the trophic signatures can be used to characterise different gears along the ecologically 'unsustainable-sustainable' continuum.
dc.identifier.doi10.3354/meps333117
dc.identifier.issn0171-8630
dc.identifier.otherAUT: KER00543;
dc.identifier.urihttp://hdl.handle.net/10400.1/8844
dc.language.isoeng
dc.peerreviewedyes
dc.publisherInter Research
dc.relation.isbasedonWOS:000245557100011
dc.titleTrophic signatures of small-scale fishing gears: implications for conservation and management
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage128
oaire.citation.startPage117
oaire.citation.titleMarine Ecology Progress Series
oaire.citation.volume333
person.familyNameStergiou
person.familyNameErzini
person.givenNameKonstantinos
person.givenNameKarim
person.identifier.ciencia-idD917-7133-341A
person.identifier.orcid0000-0002-6039-3585
person.identifier.orcid0000-0002-1411-0126
person.identifier.ridM-5216-2013
person.identifier.scopus-author-id7004015948
rcaap.rightsopenAccess
rcaap.typearticle
relation.isAuthorOfPublicationce2dcf16-e103-4b1b-b8f8-1f6967be55e5
relation.isAuthorOfPublicatione20f0e2d-3085-4c37-9e98-260dc9faddea
relation.isAuthorOfPublication.latestForDiscoverye20f0e2d-3085-4c37-9e98-260dc9faddea

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