Establishing minimum counts for semiquantitative bank‐to‐bank river transect mussel studies in species‐poor rivers

Leppänen, Jaakko Johannes

doi:10.1002/rra.3394

Cited by 3 publications

(1 citation statement)

References 25 publications

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“…We then searched for adults in the wadeable areas using an opaque-walled bathyscope. In the 2018 survey, in each 10 x 10 km UTM grid (cUTM onwards), we sampled at least 1 km of watercourse in five stretches of varying length, following the recommendations of Leppänen (2018) for rivers with a low abundance of mollusks and the basic principles presented in the European CEN standard on monitoring of the fresh water pearl mussel (Boon et al, 2019). The riverbeds, in the wadeable areas, were thoroughly inspected (250-300 m in length) when the water level was at its lowest.…”

Section: Survey Methodsmentioning

confidence: 99%

Assessment of endangered freshwater pearl mussel populations in the Northern Iberian Plateau in relation to non–native species: xenodiversity as a threat

Morales

2022

Anim. Biodiv. Conserv.

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In the last two decades, small populations of freshwater pearl mussels, Margaritifera margaritifera, have been recorded in Mediterranean rivers of the Iberian Northern Plateau. A survey was carried out in Castilla and León in 2018 to assess the development of populations of this species in all the rivers of known distribution and to update the threat classification. Thirty sections in the rivers Negro, Tera, Alberche and Águeda were positive for its presence, and another 50 stretches of seven rivers were negative. The species is currently distributed over about 22.5 km. Águeda and Tera populations have decreased dramatically in the last 14 years and are on the threshold of extinction. The Negro river supports the largest population, although the species has now disappeared in at least 61 % of the stretches that were inhabited in 2004. All populations showed very low densities and an ageing population structure, with no recruitment for decades. The presence of non-native invasive alien species (NIS) was higher than in a previous regional survey, with the signal crayfish representing the greatest threat. We observed changes in benthic microhabitats and direct predation of adults and glochidia conglutinates. In the Alberche River, in strict syntopy with M. margaritifera and two other mussel species, 10 NIS were detected. The current hydrological and ecological conditions in the Duero watershed support the settlement of exotic species to the disadvantage of native mollusks, which are more demanding in terms of microhabitats.

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Section: Survey Methodsmentioning

confidence: 99%

Assessment of endangered freshwater pearl mussel populations in the Northern Iberian Plateau in relation to non–native species: xenodiversity as a threat

Morales

2022

Anim. Biodiv. Conserv.

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Conservation status and a novel restoration of the endangered freshwater mussel Unio crassus Philipsson, 1788: Poland case

Soroкa

Wasowicz

Zając

2021

Knowl. Manag. Aquat. Ecosyst.

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Bivalves play an important part in freshwater ecosystems and improve water quality; the thick-shelled river mussel Unio crassus is classified as a bioindicator. Unfortunately, the species is regarded as endangered and is under species protection in the whole of Europe. The reasons for the drastic decline of its populations are: considerable eutrophication of waters, anthropogenic influence in its broad sense and the presence of invasive species. The life cycle of U. crassus includes the stage of larva which is an obligatory parasite of fish. This makes it possible for the species to disperse and populate new territories but it limits the development to places where appropriate host species are available. Intensive measures have been taken in Poland to protect U. crassus, while in France numerous new localities of the species have been bar-coded. In 2010–2014 active protection measures were taken in southern Poland, including inventorying, studies of genetic diversity and reintroductions. The project contributed to the increase in population abundance and in the number of localities of the thick-shelled river mussel, which resulted in a twofold increase in the range of occurrence of the species in the river. The procedures presented here can and should be used in further restitution of U. crassus not only in Poland but also elsewhere in Europe.

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An Initial Survey of Unionid Mussels in Lakes East of the Missouri River in South Dakota, USA

Henderson,

Wollman,

Pasbrig

et al. 2024

Diversity

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This study surveyed freshwater mussels (family Unionidae) in 116 lakes and reservoirs east of the Missouri River in South Dakota, USA, during 2017. Using two-person–hour/site timed searches, evidence of a total of 1789 mussels, including 1053 live mussels, was obtained from 50 waters. Nine species, from two different orders, were found in lakes and reservoirs throughout five of the six major river drainages east of the Missouri River. The native species observed included Giant Floater Pyganodon grandis, Fatmucket Lampsilis siliquoidea, Threeridge Amblema plicata, White Heelsplitter Lasmigona complanata, Wabash Pigtoe Fusconaia flava, Deertoe Truncilla truncata, and Pink Heelsplitter Potamilus alatus. Giant Floater was the most widespread and abundant species observed, representing 63.3% of the live mussels sampled. Two non-native species, Zebra Mussel Dreissena polymorpha and Chinese Basket Clam Corbicula fluminea, were also documented from three water bodies in the lower Missouri River drainage. Overall, mussel abundance was negatively correlated with lake water conductivity and positively correlated with turbidity. No significant correlations were observed between species abundance and water temperature, pH, dissolved oxygen, or substrate particle size.

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Establishing minimum counts for semiquantitative bank‐to‐bank river transect mussel studies in species‐poor rivers

Cited by 3 publications

References 25 publications

Assessment of endangered freshwater pearl mussel populations in the Northern Iberian Plateau in relation to non–native species: xenodiversity as a threat

Assessment of endangered freshwater pearl mussel populations in the Northern Iberian Plateau in relation to non–native species: xenodiversity as a threat

Conservation status and a novel restoration of the endangered freshwater mussel Unio crassus Philipsson, 1788: Poland case

An Initial Survey of Unionid Mussels in Lakes East of the Missouri River in South Dakota, USA

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