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dc.contributor.authorSousa, Ronaldo Gomespor
dc.contributor.authorAmorim, Ângelapor
dc.contributor.authorSobral, Carinapor
dc.contributor.authorFroufe, Elsapor
dc.contributor.authorVarandas, Simonepor
dc.contributor.authorTeixeira, Amílcarpor
dc.contributor.authorLima, Manuel Lopespor
dc.date.accessioned2018-01-12T19:25:14Z-
dc.date.issued2013-11-
dc.identifier.issn0364-152Xpor
dc.identifier.urihttp://hdl.handle.net/1822/49221-
dc.description.abstractAn important population of the critically endangered pearl mussel Margaritifera margaritifera (Linnaeus, 1758) was surveyed at the edge of its southern distribution (River Paiva, Portugal). Although an earlier study suggested that this population had a very low number of individuals (<500), a narrow distribution, and was mainly comprised by old specimens our data contradict these findings. Our assessment estimated a population with probably more than 5,000 individuals distributed across 80 km of the river length. From the 32 sites surveyed, 19 contained M. margaritifera with higher abundances verified in the middle and upper parts of the river (a maximum of 78 ind. per 100 m of river stretch was recorded). The pearl mussels showed a clear preference for areas near the banks, in shallow water, sandier and gravel sediments, and a high degree of riparian vegetation cover. The population structure was skewed with a very high percentage of large (and old) animals but 3.7 % of the individuals collected were juveniles (<60 mm in length); therefore, this population can be considered functional. Environmental characterization indicated that this river is still in excellent or good condition although some areas showed deterioration due to discharge of domestic effluents. The main conservation requirements of M. margaritifera in the River Paiva include maintaining the water quality (and if possible stopping the discharge of domestic effluents), increasing riparian vegetation cover, removing several weirs to increase connectivity, and increasing trout density.por
dc.description.sponsorshipWe fully appreciated help given by Catia Santos, Florbela Torres, Joaquim de Jesus, Marisa Lopes, Ricardo Azevedo, Sergio Pereira, and Vitor Pereira during field surveys and to Louise Lavictoire for a careful revision. Suggestions made by three anonymous referees were also highly appreciated. Financial support was provided by Portuguese Foundation for Science and Technology (FCT) and COMPETE funds-projects "ECO-IAS" (Contract: PTDC/AAC-AMB/116685/2010) and CONBI (Contract: PTDC/AAC-AMB/117688/2010).por
dc.language.isoengpor
dc.publisherSpringerpor
dc.rightsrestrictedAccesspor
dc.subjectAge factorspor
dc.subjectAnimalspor
dc.subjectBivalviapor
dc.subjectBody sizepor
dc.subjectConservation of natural resourcespor
dc.subjectEnvironmental monitoringpor
dc.subjectPopulation densitypor
dc.subjectPortugalpor
dc.subjectRiverspor
dc.subjectAnimal distributionpor
dc.subjectEcosystempor
dc.subjectConservationpor
dc.subjectDistributionpor
dc.subjectFreshwater pearl musselpor
dc.subjectMargaritifera margaritiferapor
dc.subjectRiver Paivapor
dc.titleEcological status of a Margaritifera margaritifera (Linnaeus, 1758) population at the southern edge of its distribution (River Paiva, Portugal)por
dc.typearticlepor
dc.peerreviewedyespor
degois.publication.firstPage1230por
degois.publication.lastPage1238por
degois.publication.issue5por
degois.publication.volume52por
dc.identifier.essn1432-1009por
dc.identifier.doi10.1007/s00267-013-0117-6por
dc.description.publicationversioninfo:eu-repo/semantics/publishedVersionpor
dc.subject.wosScience & Technologypor
sdum.journalEnvironmental Managementpor
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