Differential exposure, duration, and sensitivity of unionoidean bivalve life stages to environmental contaminants

Cope, W. Gregory; Bringolf, Robert B.; Buchwalter, David B.; Newton, Teresa J.; Ingersoll, Christopher G.; Wang, Ning; Augspurger, Tom; Dwyer, F. James; Barnhart, M. Christopher; Neves, Richard J.; Hammer, Edward J.

doi:10.1899/07-094.1

Cited by 168 publications

(165 citation statements)

References 49 publications

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“…Even after the improvement of Lake Orta conditions and the neutralization of pH values accomplished by liming (1989)(1990), studies documenting the progressive recovery of both pelagic and benthic populations (Baudo et al, 2001a;Bielli and Tesauro, 2001;Nocentini et al, 2001) failed to reveal the presence of mussels or any other molluscs. Since mussels are highly sensitive to acidification (Økland and Økland, 1986;Taskinen et al, 2011), ammonia (Augspurger et al, 2003;Wang et al, 2008) and heavy metals (Naimo, 1995;Keller et al, 2006), particularly at the earlier life stages (Wang et al, 2007a(Wang et al, , 2007bCope et al, 2008;Cleawater et al, 2014), the high sediment toxicity, that did not improved but was rather worsened by liming, likely hindered recolonization. Furthermore, once extirpated from a water body, mussels are not able to recolonize easily, particularly if they lack access to restocking populations (Strayer et al, 2004), due to constraints related to their complex life cycle.…”

Section: Discussionmentioning

confidence: 99%

When and how? Freshwater mussel recolonization in Lake Orta

et al. 2016

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Thanks to a video posted on a social network, live mussels of Unio elongatulus, have been recorded from Lake Orta (Italy) over one century after the last (and only) report. With its long and well documented history of pollution, Lake Orta offers the opportunity to document the post-extirpation recovery of freshwater unionid mussels. This case evidences that recovery/recolonization is possible despite a high devastation in the past, and permits to evaluate how fast recolonization may occur, in which way, and in what conditions. The answer to the how fast was sought by estimating the age of the larger and seemingly older individuals of the population. To address the in which way we compared the haplotypes of Lake Orta specimens of Unio elongatulus (the only species present) with those of surrounding populations. We concluded that, since Lake Orta lacks a direct connection with the putative source populations, colonizing mussels were almost certainly transported by fish carrying glochidia that were used for lake restocking after liming. Data from the long-term monitoring of water chemistry and sediments have allowed defining what conditions proved to be suitable for survival making possible the start of mussels recovery. But not only water and sediment quality matters for mussels recovery, which was delayed by nearly ten years after the reappearance of fish. This delay reflects the need of the whole trophic chain to be reestablished to allow the survival of the suitable and healthy host-fish populations necessary for mussels reproduction.

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Section: Discussionmentioning

confidence: 99%

When and how? Freshwater mussel recolonization in Lake Orta

et al. 2016

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“…Similar studies showed that adults were less sensitive to toxicants than glochidia and 2-4-year-old juveniles (Cope et al 2008), but there is no information regarding potential changes in susceptibility to environmental stressors during adulthood (from 4 up to 100 years and more). Increased susceptibility of aging organisms to a particular kind of stress could be explained either by differences in lifestyle between young and old mussels-for instance, in many unionids, juveniles remain burrowed in sediment for their first 2 to 4 years, mainly relying on deposit feeding while the main exposure route in adults is the water and suspended solids overlying the sediments (Cope et al 2008)-or by a general lowering of cell metabolism. The FAMT method was conducted on each age class separately in order to investigate how age could affect the molecular response of M. margaritifera to trace metals.…”

Section: Effects Of Individual Factors On Gene Expression In Kidneymentioning

confidence: 97%

“…construction of dams, and introduction of exotic species (Strayer et al 2004). The vast number of potential factors contributing to their decline makes it difficult to determine the key chemical contaminants or set of environmental conditions to target in a regulatory framework for protection and conservation (Cope et al 2008). Recent studies on freshwater mussels have documented the impairment of their physiological and biochemical status due to reduced water quality (Lummer et al 2016;Kerambrun et al 2016;Gillis et al 2017).…”

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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“…Further investigations could consider effects of different host fish species and mussel populations from a variety of local thermal conditions on glochidia release. The survival of released glochidia followed drop offs observed for other mussel species (Zimmerman & Neves, 2002;Cope et al, 2008). Elevated temperatures may possibly affect metabolic rates and result in short-lived glochidia, as seen in the HIGH temperature scenario (Teutsch, 1997;Jansen et al, 2001;Pandolfo et al, 2010).…”

Section: Host Presence and Glochidia Survivalmentioning

confidence: 70%

Evaluating temperature- and host-dependent reproduction in the parasitic freshwater mussel Unio crassus

2017

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Adaptation to temperature regimes and host presence may enhance fitness in parasites. In an experimental study, we evaluated the timing of glochidia release by Unio crassus subjected to three spring water temperature regimes in the presence and absence of the host fish Cottus gobio. The timing of glochidia release was delayed at (i) constantly low temperatures (\10°C), in contrast to earlier and pronounced releases at (ii) natural temperature increases that level off at intermediate temperatures (10-15°C), and (iii) higher-than-normal temperatures (10-20°C). Mussels from treatment (i) that had not released glochidia during the experiment did so soon after being moved to the temperature in (ii), indicating a temperature threshold for glochidia release. Neither host fish presence nor the combined effect of temperature and host fish presence significantly affected the timing of glochidia release. The treatment with natural spring water temperatures indicated possible fitness benefits for U. crassus through combined effects of high intensities of glochidia releases and high survival of released glochidia. The furthered understanding of climate change effects on mussel and host phenology in seasonal environments, potentially inducing temporal mismatches of glochidia release to host availability, is key to mussel conservation.

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Differential exposure, duration, and sensitivity of unionoidean bivalve life stages to environmental contaminants

Cited by 168 publications

References 49 publications

When and how? Freshwater mussel recolonization in Lake Orta

When and how? Freshwater mussel recolonization in Lake Orta

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

Evaluating temperature- and host-dependent reproduction in the parasitic freshwater mussel Unio crassus

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