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Preliminary studies on the habitat characterization of Margaritifera margaritifera populations from the Rabaçal and Tuela rivers (Northeast of Portugal)

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dc.contributor.authorLopes-Lima, Manuel
dc.contributor.authorTeixeira, Amílcar
dc.contributor.authorOliveira, Sara
dc.contributor.authorHinzmann, Mariana
dc.contributor.authorAntunes, Filipa
dc.contributor.authorClaro, Ana Marília
dc.contributor.authorMachado, Jorge
dc.date.accessioned2011-06-07T15:08:58Z
dc.date.available2011-06-07T15:08:58Z
dc.date.issued2009
dc.description.abstractPortuguese M. margaritifera populations being in the southern distribution limit are exposed to different ecological conditions at least on the water temperature that is far higher than in the pearl mussel’s rivers from central and northern Europe. However there were more than ten known functional populations that existed in the beginning of the 20th century. Nowadays only two of these populations remain healthy and viable with an estimated one million in Rabaçal and fifty thousand mussels in the Tuela river. However, these populations are still threatened by anthropogenic influences responsible for the loss of the available habitat. A more comprehensive knowledge on the habitat requirements of M. margaritifera is essential to identify the best river management policies. The River Habitat Survey showed that Rabaçal and Tuela river sections have excellent quality. The preference curves for juveniles and adults of M. margaritifera, were shown to be similar to the water column velocity (0.10-0.20 m.s-1) and bottom velocity (0-0.10 m.s-1), dominant substrate (sand and gravel) and depth (30-40 cm), and different for the sub-dominant substrate (fine sediments for juveniles and cobbles and boulders for adults) and cover (boulders for juvenile and overhanging vegetation, roots and boulders for adults); Low levels of dissolved salts (conductivity <50 μS/cm), nutrients (N-Total <0.2 mg/L; P-Total <0.1 mg/L), Organic Matter (POM <4.5 mg/L and PIM < 0.01mg/L) and a high O2 concentration (> 10 mg/L) were detected, revealing a good water quality of these ecosystems.por
dc.identifier.citationLopes-Lima, M.; Teixeira, A.; Oliveira, S.; Hinzmann, M.; Antunes, F.; Claro, A.; Machado, J. (2009). Preliminary studies on the habitat characterization of Margaritifera margaritifera populations from the Rabaçal and Tuela rivers (Northeast of Portugal). In Seminar on Conservation of Freshwater Pearl Mussels. Ardennespor
dc.identifier.urihttp://hdl.handle.net/10198/5030
dc.language.isoengpor
dc.peerreviewedyespor
dc.subjectMargaritifera margaritiferapor
dc.subjectHabitatpor
dc.subjectWater qualitypor
dc.titlePreliminary studies on the habitat characterization of Margaritifera margaritifera populations from the Rabaçal and Tuela rivers (Northeast of Portugal)por
dc.typeconference object
dspace.entity.typePublication
oaire.citation.conferencePlaceArdennes, Luxembourgpor
oaire.citation.titleSeminar on Conservation of Freshwater Pearl Musselspor
person.familyNameTeixeira
person.givenNameAmilcar
person.identifier2153193
person.identifier.ciencia-id9510-3CF3-0393
person.identifier.orcid0000-0001-5336-1174
person.identifier.scopus-author-id7202385393
rcaap.rightsopenAccesspor
rcaap.typeconferenceObjectpor
relation.isAuthorOfPublication4f0753fd-4b4f-46f6-8e2f-20c7f835a32a
relation.isAuthorOfPublication.latestForDiscovery4f0753fd-4b4f-46f6-8e2f-20c7f835a32a

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