Impacts of flow regulation on freshwater pearl mussel (Margaritifera margaritifera) habitat in a Scottish montane river

Addy, Stephen; Cooksley, Susan; Sime, Iain

doi:10.1016/j.scitotenv.2012.05.079

Cited by 16 publications

(15 citation statements)

References 61 publications

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“…Among the activities threatening the freshwater pearl mussels, construction of dams may be considered prominent (Baskaya et al, 2011;Cosgrove et al, 2000;Metzeling et al, 2004). Changes include alterations in channel morphology, increased water depth, change from lotic to lentic conditions, accumulation of fine sediments, and altered seasonality of flow, temperature and oxygen (Addy et al, 2012;Vaughn and Taylor, 1999). The comparison of data collected by Reis (2003) and Sousa et al (in press) in several Portuguese rivers shows that the construction of dams coincided with severe declines of M. margaritifera.…”

Section: Tablementioning

confidence: 93%

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

110

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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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Section: Tablementioning

confidence: 93%

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

110

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“…Direct physical habitat disturbance resulting from channelization of rivers or the presence of impoundments, usually result in pearl mussel declines and a decrease in connectivity, including in the host fishes (Mueller et al, 2011;Addy et al, 2012). Particularly important in Portugal are the changes mediated by the presence of recently constructed dams and weirs in several of the rivers surveyed, which may be responsible for severe declines in pearl mussels.…”

Section: Main Threatsmentioning

confidence: 99%

“…A comparison of the pearl mussels' abundance at S4 and S5 with S6 and further upstream sites shows a clear difference. The main driving mechanisms responsible for the great decline in M. margaritifera near these physical structures are not known but may include alterations in depth, flow, temperature, sediments, organic matter, among other factors (Vaughn and Taylor, 1999;Addy et al, 2012). For a species such as M. margaritifera, which usually colonizes sites with oligotrophic and lotic conditions, their presence in the areas upstream of these physical structures is highly improbable due to increased water depth, change from lotic to lentic conditions, accumulation of fine sediments and changes in oxygen and temperature profiles.…”

Section: Main Threatsmentioning

confidence: 99%

“…For a species such as M. margaritifera, which usually colonizes sites with oligotrophic and lotic conditions, their presence in the areas upstream of these physical structures is highly improbable due to increased water depth, change from lotic to lentic conditions, accumulation of fine sediments and changes in oxygen and temperature profiles. Many alterations may also occur downstream of these obstacles and may include direct effects through physical stress and indirect effects through changes in habitat, food and fish-host availability (Vaughn and Taylor, 1999;Addy et al, 2012). Releases from impoundments often result in both abnormally high and low flows (Vaughn and Taylor, 1999).…”

Section: Main Threatsmentioning

confidence: 99%

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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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“…Margaritifera margaritifera, the freshwater pearl shell clam with MLSP of 217 years (Schöne et al 2004) has been studied in a few works with the focus on both reproduction and growth (Ö sterling et al 2008;Addy et al 2012aAddy et al , 2012b. Owing to its alarming population decline, M. margaritifera has become a threatened species (Bauer 1983) and therefore its use for population growth curves and aging studies, which require sampling many individuals, is not recommended.…”

Section: Introductionmentioning

confidence: 99%

Age- and sex-dependent changes in morphometric and metabolic variables in the long-lived freshwater mussel Diplodon chilensis

Yusseppone

Lomovasky

Luquet

et al. 2016

Mar. Freshwater Res.

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Markers of oxidative stress and biochemical composition were investigated in digestive gland and gonad tissues in the freshwater mussel Diplodon chilensis, as well as morphometric variables in relation to chronological age and sex. Individual growth followed a von Bertalanffy growth model (VBGM). Superoxide dismutase activity, glutathione level and oxidative damage to proteins remain constant through the life of both tissues, whereas catalase and glutathione-Stransferase activities and lipid peroxidation decrease until 24-27 years of age, to remain fairly stable (mostly in the gonads) or increase slowly (mostly in the digestive gland) afterwards. The timing of these age-related changes is coincident with the age estimated (28 years) from the lower confidence interval for L N (the asymptotic length, 69.97 mm), at which the bivalves would reach their minimum growth rate. D. chilensis qualifies as an environmental mitigator for water and sediment clearance. Individuals near the age of minimum growth (20-30 years) would be better suited for bioremediation strategies compared with younger individuals (more sensitive) or to older ones, which are less active and show increasing lipid peroxidation with age. Utilising D. chilensis of this age class in sewage-polluted lake shores, in parallel with efforts to improve sewage treatment plants, would ensure an enhancement of the water and sediment cleansing for several decades.

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Impacts of flow regulation on freshwater pearl mussel (Margaritifera margaritifera) habitat in a Scottish montane river

Cited by 16 publications

References 61 publications

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

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

Conservation status of the freshwater pearl mussel Margaritifera margaritifera in Portugal

Age- and sex-dependent changes in morphometric and metabolic variables in the long-lived freshwater mussel Diplodon chilensis

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