The Global Decline of Nonmarine Mollusks

Lydeard, Charles; Cowie, Robert H.; Ponder, Winston F.; Bogan, Arthur E.; Bouchet, Philippe; Clark, Stephanie A.; Cummings, Kevin S.; Frest, T. J.; Gargominy, Olivier; Herbert, David G.; Hershler, Robert; Perez, Kathryn E.; Roth, Barry; Seddon, Mary; Strong, Ellen E.; Thompson, Fred G.

doi:10.1641/0006-3568(2004)054[0321:tgdonm]2.0.co;2

Cited by 957 publications

(690 citation statements)

References 39 publications

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“…Like many nonmarine molluscs facing a global decline (Lydeard et al 2004), the freshwater pearl mussel Margaritifera margaritifera (family Unionidae) is one of the most threatened freshwater bivalves worldwide. This species can be found in cool running waters of the Holarctic region.…”

Section: Responsible Editor: Philippe Garriguesmentioning

confidence: 99%

Transcriptomic responses of the endangered freshwater mussel Margaritifera margaritifera to trace metal contamination in the Dronne River, France

Bertucci

Pierron

Thébault

et al. 2017

Environ Sci Pollut Res

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The freshwater pearl mussel Margaritifera margaritifera is one of the most threatened freshwater bivalves worldwide. In this study, we aimed (i) to study the processes by which water quality might affect freshwater mussels in situ and (ii) to provide insights into the ecotoxicological significance of water pollution to natural populations in order to provide necessary information to enhance conservation strategies. M. margaritifera specimens were sampled in two close sites located upstream or downstream from an illegal dumping site. The renal transcriptome of these animals was assembled and gene transcription determined by RNA-seq. Correlations between transcription levels of each single transcript and the bioaccumulation of nine trace metals, age (estimated by sclerochronology), and condition index were determined in order to identify genes likely to respond to a specific factor. Amongst the studied metals, Cr, Zn, Cd, and Ni were the main factors correlated with transcription levels, with effects on translation, apoptosis, immune response, response to stimulus, and transport pathways.However, the main factor explaining changes in gene transcription appeared to be the age of individuals with a negative correlation with the transcription of retrotransposon-related genes. To investigate this effect further, mussels were classified into three age classes. In young, middle-aged and old animals, transcription levels were mainly explained by Cu, Zn and age, respectively. This suggests differences in the molecular responses of this species to metals during its lifetime that must be better assessed in future ecotoxicology studies.

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Section: Responsible Editor: Philippe Garriguesmentioning

confidence: 99%

Transcriptomic responses of the endangered freshwater mussel Margaritifera margaritifera to trace metal contamination in the Dronne River, France

Bertucci

Pierron

Thébault

et al. 2017

Environ Sci Pollut Res

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“…Understanding phylogenetic diversity is crucial for conservation prioritization of freshwater mussels (Bivalvia: Unionida), which are among the most threatened freshwater taxa in the world (IUCN, 2015;Lydeard et al, 2004). Due to their ecological and economic importance, interesting biological traits (e.g., a parasitic life with the reproductive dependence on a host fish and a particular form of mitochondrial inheritance called double uniparental inheritance; Barnhart et al, 2008;Breton et al, 2007;Hoeh et al, 1996Hoeh et al, , 2002a, scientific research on Unionida has grown in recent years (Haag, 2012;Lopes-Lima et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Phylogeny of the most species-rich freshwater bivalve family (Bivalvia: Unionida: Unionidae): Defining modern subfamilies and tribes

Lopes‐Lima

Froufe

et al. 2017

Molecular Phylogenetics and Evolution

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127

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a b s t r a c t Freshwater mussels of the order Unionida are key elements of freshwater habitats and are responsible for important ecological functions and services. Unfortunately, these bivalves are among the most threatened freshwater taxa in the world. However, conservation planning and management are hindered by taxonomic problems and a lack of detailed ecological data. This highlights the urgent need for advances in the areas of systematics and evolutionary relationships within the Unionida. This study presents the most comprehensive phylogeny to date of the larger Unionida family, i.e., the Unionidae. The phylogeny is based on a combined dataset of 1032 bp (COI + 28S) of 70 species in 46 genera, with 7 of this genera being sequenced for the first time. The resulting phylogeny divided the Unionidae into 6 supported subfamilies and 18 tribes, three of which are here named for the first time (i.e., Chamberlainiini nomen novum, Cristariini nomen novum and Lanceolariini nomen novum). Molecular analyses were complemented by investigations of selected morphological, anatomical and behavioral characters used in traditional phylogenetic studies. No single morphological, anatomical or behavioral character was diagnostic at the subfamily level and few were useful at the tribe level. However, within subfamilies, many tribes can be recognized based on a subset of these characters. The geographical distribution of each of the subfamilies and tribes is also presented. The present study provides important advances in the systematics of these extraordinary taxa with implications for future ecological and conservation studies.

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“…nutrients, heavy metals, endocrine disruptors), overexploitation (e.g. use of shells and pearls), introduction of invasive species and climate change (Lydeard et al, 2004;Strayer et al, 2004). In addition, freshwater mussels have a specialized larva, the glochidium, that needs fish as hosts in order to complete their life cycle, which further complicates the conservation of these species.…”

Section: Introductionmentioning

confidence: 99%

Impacts of climate change and land-use scenarios on Margaritifera margaritifera, an environmental indicator and endangered species

Santos

Fernandes

Varandas

et al. 2015

Science of The Total Environment

104

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• Develop a verification scheme to check stress on M. margaritifera based on thresholds • Assess the impact of future climate change in conservation status of M. margaritifera • Assess the impact of land-use in habitat requirements of M. margaritifera • Propose conservation measures to prevent extinction of M. margaritifera in Portugal a b s t r a c t a r t i c l e i n f o In this study, we assess the impacts of future climate and land-use in the Beça River (northern Portugal) under different scenarios and how this will translate into the conservation status of the endangered pearl mussel Margaritifera margaritifera (Linnaeus, 1758). This species is currently present in several stretches of the Beça River that still hold adequate ecological conditions. However, the species is threatened by projected declines in precipitation for the 21st century, with implication on the river flows and water depths that might decrease below the species requisites. This situation could be especially critical during summer conditions since the ecological flows may not be assured and several river stretches may be converted into stagnant isolated pools. The habitat connectivity will also be affected with reverberating effects on the mobility of Salmo trutta, the host of M. margaritifera, with consequences in the reproduction and recruitment of pearl mussels. In addition, humanrelated threats mostly associated with the presence of dams and an predicted increases in wildfires in the future. While the presence of dams may decrease even further the connectivity and river flow, with wildfires the major threat will be related to the wash out of burned areas during storms, eventually causing the disappearance of the mussels, especially the juveniles. In view of future climate and land-use change scenarios, conservation strategies are proposed, including the negotiation of ecological flows with the dam promoters, the replanting of riparian vegetation along the water course and the reintroduction of native tree species throughout the catchment.

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The Global Decline of Nonmarine Mollusks

Cited by 957 publications

References 39 publications

Transcriptomic responses of the endangered freshwater mussel Margaritifera margaritifera to trace metal contamination in the Dronne River, France

Transcriptomic responses of the endangered freshwater mussel Margaritifera margaritifera to trace metal contamination in the Dronne River, France

Phylogeny of the most species-rich freshwater bivalve family (Bivalvia: Unionida: Unionidae): Defining modern subfamilies and tribes

Impacts of climate change and land-use scenarios on Margaritifera margaritifera, an environmental indicator and endangered species

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