Association between the occurrence of the Thick-shelled River Mussel (<i>Unio crassus</i>) and macroinvertebrate, microbial, and diatom communities

Richter, Anna; Stoeckl, Katharina; Denic, Marco; Geist, Juergen

doi:10.1086/687811

Cited by 30 publications

(31 citation statements)

References 63 publications

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“…Freshwater bivalve molluscs (order Unionoida) are often considered the most endangered group of animals in the world (Bogan, ; Geist, , ; Lopes‐Lima et al, ; Lydeard et al, ; Neves, Bogan, Williams, Ahlstedt, & Hartfield, ; Strayer et al, ). Their presence or absence in a lake or stream can have manifold implications for the functioning of aquatic ecosystems and associated ecosystem services (Geist & Auerswald, ; Lummer, Auerswald, & Geist, ; Richter, Stoeckl, Denic, & Geist, ; Vaughn & Hakenkamp, ). In Europe, freshwater pearl mussels ( Margaritifera auricularia , Margaritifera durrovensis , and Margaritifera margaritifera ) are considered the most critically threatened unionoids (Lopes‐Lima et al, ), suggesting an urgent need for effective conservation.…”

Section: Introductionmentioning

confidence: 99%

Genetic structure of Irish freshwater pearl mussels (Margaritifera margaritifera and Margaritifera durrovensis): Validity of subspecies, roles of host fish, and conservation implications

Geist

Moorkens

Killeen³

et al. 2018

Aquatic Conservation

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European freshwater pearl mussels are among the most critically threatened bivalve molluscs. Margaritifera margaritifera and Margaritifera durrovensis are endangered, and both occur in Ireland and are currently listed separately in Annex II of the European Habitats Directive. This study had the objective of guiding the conservation of freshwater pearl mussels in Ireland based on a genetic characterization of the most important Irish populations of both species using microsatellite and mitochondrial DNA (mtDNA) analyses. Margaritifera durrovensis from the Nore was found to have the highest genetic divergence from all the populations studied; however, there was substantial relatedness between the genetic constitution of the Nore and of central–eastern M. margaritifera populations, placing the Nore pearl mussel within the M. margaritifera taxon (Habitats Directive species code 1029). Two main conservation units of pearl mussel were identified: a mostly salmon‐dependent western cluster and a trout‐dependent central–eastern cluster. The genetic diversity of western Irish freshwater pearl mussels, as expressed by allelic richness and observed heterozygosity, was greater by a factor of two than in central European and central–eastern Irish populations, suggesting a genetic diversity hot spot and low effects of genetic drift and selection. The trout‐dependent central and eastern populations had much lower genetic variability, but had the greatest differentiation and uniqueness. Conservation of freshwater pearl mussels in Ireland should recognize the existence of a minimum of two conservation units (western and central–eastern) that differ in their use of host fish and in geographic isolation. Low levels of genetic drift and inbreeding in western populations should be secured by sustaining optimal habitat conditions favourable for the recruitment of mussels and their migratory salmonid hosts. The small population sizes of central–eastern populations and problems with recruitment require urgent action, e.g. by captive breeding and augmentation, to prevent any further erosion of their genetic variability.

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Section: Introductionmentioning

confidence: 99%

Genetic structure of Irish freshwater pearl mussels (Margaritifera margaritifera and Margaritifera durrovensis): Validity of subspecies, roles of host fish, and conservation implications

Geist

Moorkens

Killeen³

et al. 2018

Aquatic Conservation

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“…Freshwater mussel species are extremely important organisms for the conservation of freshwater ecological balance. The environmental factors are very important in the areas where these populations are distributed for sustainability of the species [17][18]. Although U. crassus is resistant to undesirable environmental conditions, the population of this species was reduced in many European countries and it became endangered [10,19].…”

Section: Discussionmentioning

confidence: 99%

Determining Bioecological and Biometric Properties of Freshwater Mussels (Unio crassus Philipsson, 1788)

Serdar¹,

Bulut²,

Eden³

et al. 2019

Pol. J. Environ. Stud.

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Population characteristics of Unio crassus, an endangered freshwater mussel in many countries, are very important. In this study, we have attempted to determine the environmental conditions of Aydın-Çine Creek and the biometric properties of U.crassus. The largest length during the study period was 92.50 mm in February, and the smallest length was 37.03 mm in April. In addition, the heaviest individual was found to be 124.15 g in February, while the smallest individual was 6.69 g in April. It was found that 141 individuals were found in a group of 70.0-79.99 mm at maximum in the distribution frequency of U.crassus in Çine Creek. The water temperature was measured at 9.8-24.0ºC, and oxygen value was 6.0-10.4 mg/L during the study. In the current environmental conditions in Çine Creek, various sizes and population development of U.crassus have been identified.

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“…Increased microbial diversity and activity has been 395 attributed to the variety of C and N components in feces and pseudofeces, and also selects for the 396 (Michaud et al 2009). On the other hand, investigation of microbiota in Thick-shelled River 400 Mussel (Unio crassus) beds did not find any difference in microorganism diversity, abundance, 401 and composition (Richter et al 2016). This may be explained by the drastic differences in the 402 study site, with high mussel densities (23-433 mussels/m 2 ) and control plots containing low 403 microbial diversities with mean species richness of 48 OTUs/sample with high evenness (Richter 404 et al 2016).…”

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confidence: 92%

Peer Review #3 of "Effect of freshwater mussels on the vertical distribution of anaerobic ammonia oxidizers and other nitrogen-transforming microorganisms in upper Mississippi river sediment (v0.3)"

Kessel¹

2017

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Targeted qPCR and non-targeted amplicon sequencing of 16S rRNA genes within sediment layers identified the anaerobic ammonium oxidation (anammox) niche and characterized microbial community changes attributable to freshwater mussels. Anammox bacteria were normally distributed (Shapiro-Wilk normality test, W-statistic=0.954, p=0.773) between 1-15 cm depth and were increased by a factor of 2.2 (p<0.001) at 3 cm below the watersediment interface when mussels were present. Amplicon sequencing of sediment at depths relevant to mussel burrowing (3 and 5 cm) showed that mussel presence reduced observed species richness (p=0.005), Chao1 diversity (p=0.005), and Shannon diversity (p<0.001), with more pronounced decreases at 5 cm depth. A non-metric, multidimensional scaling model showed that intersample microbial species diversity varied as a function of mussel presence, indicating that sediment below mussels harbored distinct microbial communities. Mussel presence corresponded with a 4-fold decrease in a majority of operational taxonomic units (OTUs) classified in the phyla Gemmatimonadetes,

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Association between the occurrence of the Thick-shelled River Mussel (Unio crassus) and macroinvertebrate, microbial, and diatom communities

Cited by 30 publications

References 63 publications

Genetic structure of Irish freshwater pearl mussels (Margaritifera margaritifera and Margaritifera durrovensis): Validity of subspecies, roles of host fish, and conservation implications

Genetic structure of Irish freshwater pearl mussels (Margaritifera margaritifera and Margaritifera durrovensis): Validity of subspecies, roles of host fish, and conservation implications

Determining Bioecological and Biometric Properties of Freshwater Mussels (Unio crassus Philipsson, 1788)

Peer Review #3 of "Effect of freshwater mussels on the vertical distribution of anaerobic ammonia oxidizers and other nitrogen-transforming microorganisms in upper Mississippi river sediment (v0.3)"

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