A new record of the freshwater pearl musselMargaritifera margaritifera L. (Bivalvia, Unionoida) from the River Narcea (Asturias, north-western Spain)

lvarez-Claudio, C.; Garca-Rovs, P.; Ocharan, R.; Cabal, J.; Ocharan, Francisco J.; lvarez, M.A.

doi:10.1002/(sici)1099-0755(200003/04)10:2<93::aid-aqc392>3.0.co;2-4

Cited by 20 publications

(26 citation statements)

References 11 publications

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“…This situation has already been described for many Iberian and other European populations and is the major factor concerning the survival of this species (Álvarez-Claudio et al, 2000;Hastie et al, 2000;Geist, 2010;Österling et al, 2010;Hastie, 2011;Lois et al, 2014). Nevertheless, with the exception of the River Terva, a few juveniles were present.…”

Section: Conservation Statussupporting

confidence: 59%

Conservation status of the freshwater pearl mussel Margaritifera margaritifera in Portugal

Sousa¹,

Amorim²,

Froufe³

et al. 2015

Limnologica

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a b s t r a c tBased on new information, the current conservation status of the freshwater pearl mussel Margaritifera margaritifera (Linnaeus, 1758) in Portugal is revised. Between 2010 and 2013 surveys were conducted in eight different rivers to assess distribution, abundance, size-frequency and preferential habitat of this species. Rivers Neiva, Cávado and Terva presented very low abundances (in the Cávado no specimens were found) and showed acute signs of ageing, calling into question the future survival of these populations. Although abundances were low in Rivers Beç a, Paiva and Mente, juveniles were present and populations may improve their conservation status in the future, if appropriate management measures are applied. Rivers Rabaç al and Tuela presented the highest abundances of adults and juveniles and these two rivers have the highest potential for the conservation of freshwater pearl mussels in Portugal. However, these two populations have suffered severe declines in several stretches due to the construction of dams in recent years. Given that the Portuguese pearl mussel populations are at the southern range of the species distribution, their conservation should be a priority. This current description of the conservation status of M. margaritifera in Portugal can be used as a reference, and guide future research and management initiatives to better conserve this species.

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Section: Conservation Statussupporting

confidence: 59%

Conservation status of the freshwater pearl mussel Margaritifera margaritifera in Portugal

Sousa¹,

Amorim²,

Froufe³

et al. 2015

Limnologica

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“…Larsen 2010, Makhrov et al 2011, Ostrovsky and Popov 2011, Oulasvirta 2011. The fact that previously unknown FPM populations have been found quite recently (Álvarez-Claudio et al 2000, Reis 2003, Valovirta 2006, Ostrovsky and Popov 2011, Oulasvirta 2011 supports that statement. One apparent explanation for the incomplete knowledge is the occurrence of FPM in oligotrophic waters that are close to their natural state, meaning that many of the remaining populations are located in remote areas far from human civilization (see e.g.…”

Section: Mapping the Occurrence Of The Freshwater Pearl Musselmentioning

confidence: 87%

“…It can colonize fluvial habitats from small streams to large rivers, but is generally more frequent in cold and pristine 0.3-0.4 m deep waters which are low in vegetation and nutrients, poor in calcium and rich in oxygen, the bottom of which consists of patches of rocks, coarse sand and fine gravel and which have current speed of 0.3-0.5 ms -1 (Clarke and Berg 1959, Young and Williams 1983a, Valovirta 1993, Beasley and Roberts 1999, Álvarez-Claudio et al 2000, Hastie et al 2000a, Geist and Auerswald 2007, Dolmen and Kleiven 2008, Outeiro et al 2008, Ostrovsky and Popov 2011, Degerman et al 2013, Jung et al 2013, Varandas et al 2013, Lopes-Lima et al 2016. Reflecting these habitat requirements, this mollusc is often considered an indicator of good water quality and a healthy, unpolluted ecosystem which is at least close to natural state (e.g.…”

Section: Habitat Preferences and Life Cycle Of The Freshwater Pearl Mmentioning

confidence: 99%

“…In smaller streams an aquascope (a glass-bottomed box) is usually used (Cosgrove et al 2000, Reis 2003, Valovirta 2006, Österling et al 2008, Ostrovsky and Popov 2011, Oulasvirta 2011, Varandas et al 2013, Simon et al 2015 and in rivers with moderate depth snorkelling is the common method (Oulasvirta 2011, Varandas et al 2013, while in large channels scuba diving may be the only possibility to detect mussels (Oulasvirta 2011). However, certain river characteristics, such as dark or deep water, strong current or stony bottom, may limit the use of these methods (Young and Williams 1983a, Álvarez-Claudio et al 2000, Cosgrove et al 2000, Oulasvirta 2011). Thus any new means to search for FPM would be welcome.…”

Section: Mapping the Occurrence Of The Freshwater Pearl Musselmentioning

confidence: 99%

“…In a small river with clear water, one can perhaps find a mussel without any device. However, detecting a mussel is often difficult even in a habitat in which its occurrence is confirmed, and factors like dark and turbid water may further impede the visual finding of mussels (Young and Williams 1983a, Álvarez-Claudio et al 2000, Cosgrove et al 2000, Oulasvirta 2011. A large river area, in addition to a large number of small brooks, as is typical of catchments e.g.…”

Section: Electrofishing To Search For M Margaritifera Populations (Iv)mentioning

confidence: 99%

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An alien fish threatens an endangered parasitic bivalve: the relationship between brook trout (Salvelinus fontinalis) and freshwater pearl mussel (Margaritifera margaritifera) in northern Europe

Salonen

Marjomäki

Taskinen

2016

Aquatic Conservation

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Salonen, JouniThe role of salmonid fishes in conservation of the endangered freshwater pearl mussel (Margaritifera margaritifera) Jyväskylä: University of Jyväskylä, 2016, 48 The abundance of freshwater pearl mussels (Margaritifera margaritifera) has declined widely during the past century, and new conservation initiatives are needed. This thesis focused on the relationship between M. margaritifera and its salmonid host required for reproduction of this species. First, by exposing fish experimentally to glochidium larvae of M. margaritifera, different M. margaritifera populations were shown to demonstrate strong differences in their ability to parasitize different salmonid species. Atlantic salmon was clearly a better host for mussels in large river channels, whereas in small headwater tributaries brown trout was the best, or the only suitable, host. These findings provide a previously unrecognised explanation for the collapse and the lack of recruitment especially of the salmon-specific M. margaritifera populations; a high proportion of large salmon rivers were dammed for hydropower production in the 1960s, which prevented the migration of salmon and thus left M. margaritifera without the appropriate host in these rivers. Furthermore, an invasive salmonid, brook trout, was widely introduced to small tributaries above the dams in the past, but in this study was shown to be an unsuitable host for M. margaritifera. Thus, and due to the tendency of brook trout to replace native brown trout, the spread of brook trout is an additional threat to M. margaritifera. An indication of local adaptation of M. margaritifera, i.e. higher infectivity in sympatric salmonid host strain than in allopatric populations of the same species, was also detected. Finally, a new, nondestructive approach to search for M. margaritifera populations, involving electrofishing and quick visual examination of the gills of captured salmonids, revealed the occurrence of 3 previously unknown populations. The results of this thesis highlight the importance of taking into account the roles of salmonid fish in future efforts to search, protect and restore freshwater pearl mussel populations.

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Schadstoffe in Muscheln - Nachweismethoden und Wirkungen

Schrenk‐Bergt

2004

Handbuch Angewandte Limnologie: Grundlagen - Gewässerbelastung - Restaurierung - Aquatische Ökotoxikologie - Bewertung - Gewäss

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A new record of the freshwater pearl musselMargaritifera margaritifera L. (Bivalvia, Unionoida) from the River Narcea (Asturias, north-western Spain)

Cited by 20 publications

References 11 publications

Conservation status of the freshwater pearl mussel Margaritifera margaritifera in Portugal

Conservation status of the freshwater pearl mussel Margaritifera margaritifera in Portugal

An alien fish threatens an endangered parasitic bivalve: the relationship between brook trout (Salvelinus fontinalis) and freshwater pearl mussel (Margaritifera margaritifera) in northern Europe

Schadstoffe in Muscheln - Nachweismethoden und Wirkungen

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