Survie Embryonnaire Du Saumon Atlantique (Salmo Salar L.) Dans Un Cours D’eau Du Sud De Son Aire De Répartition, La Nivelle

Dumas, Jacques; Olaizola, Matilde Moralejo; Barrière, L.

doi:10.1051/kmae:2007009

Cited by 9 publications

(4 citation statements)

References 33 publications

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“…Most S. salar populations are considered endangered due to anthropogenic pressures including recreational and professional fishing, alteration of feeding grounds at sea by global changes, habitat loss through dam construction or degradations of spawning habitats (Bagliniè re et al, 1990;Schindler, 2001). Salmon embryos develop into gravel riverbeds and are thus often exposed to hypoxic stress causing high mortality rates (Malcolm et al, 2003;Dumas et al, 2007). If embryos survive to hypoxia, their development is nonetheless slower, and they are smaller at hatching compared to nonstressed individuals (Ciuhandu et al, 2005;Greig et al, 2005;Finn, 2007).…”

Section: Introductionmentioning

confidence: 99%

Population differences in response to hypoxic stress in Atlantic salmon

Côte

Roussel

Cam

et al. 2012

J of Evolutionary Biology

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Understanding whether populations can adapt to new environmental conditions is a major issue in conservation and evolutionary biology. Aquatic organisms are increasingly exposed to environmental changes linked with human activities in river catchments. For instance, the clogging of bottom substratum by fine sediments is observed in many rivers and usually leads to a decrease in dissolved oxygen concentrations in gravel beds. Such hypoxic stress can alter the development and even be lethal for Atlantic salmon (Salmo salar) embryos that spend their early life into gravel beds. In this study, we used a common garden experiment to compare the responses to hypoxic stress of four genetically differentiated and environmentally contrasted populations. We used factorial crossing designs to measure additive genetic variation of early life-history traits in each population. Embryos were reared under normoxic and hypoxic conditions, and we measured their survival, incubation time and length at the end of embryonic development. Under hypoxic conditions, embryos had a lower survival and hatched later than in normoxic conditions. We found different hypoxia reaction norms among populations, but almost no population effect in both treatments. We also detected significant sire 9 treatment interactions in most populations and a tendency for heritability values to be lower under stressful conditions. Overall, these results reveal a high degree of phenotypic plasticity in salmon populations that nevertheless differ in their adaptive potential to hypoxia given the distinct reaction norms observed between and within populations.

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Section: Introductionmentioning

confidence: 99%

Population differences in response to hypoxic stress in Atlantic salmon

Côte

Roussel

Cam

et al. 2012

J of Evolutionary Biology

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“…Third, maternal care, in the form of nesting site selection and egg burying, is usually very efficient in preventing mortality (egg survival is very variable but can reach 100% in optimal habitats; Malcolm et al. 2003; Meyer 2003; Dumas et al. 2007), so the additional benefit obtained through male involvement in care would probably be too low to compensate for the costs in terms of lost mating opportunities.…”

Section: Introductionmentioning

confidence: 99%

“…Second, females often have multiple mates, so the uncertainty in paternity is such that caring males run the risk of caring for their competitors' offspring, which lowers the benefits of care. Third, maternal care, in the form of nesting site selection and egg burying, is usually very efficient in preventing mortality (egg survival is very variable but can reach 100% in optimal habitats; Malcolm et al 2003;Meyer 2003;Dumas et al 2007), so the additional benefit obtained through male involvement in care would probably be too low to compensate for the costs in terms of lost mating opportunities. Consistently and up to now, salmonid males have been thought to provide no paternal care and generally desert the nest quickly after spawning (De Gaudemar & Beall 1999), presumably to seek other females.…”

Section: Introductionmentioning

confidence: 99%

Male antagonistic behaviour after spawning suggests paternal care in brown trout, Salmo trutta

Tentelier

Larrieu

Aymes

et al. 2011

Ecology of Freshwater Fish

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– The evolution of parental care depends on the sex‐dependent resolution of a trade‐off between present and future reproduction. In salmonids, the mating systems are often characterised by fierce male–male competition, and the absence of paternal care is widely admitted in these species. However, the fact that brown trout eggs can be cannibalised by peripheral individuals just after spawning suggests that dominant males would benefit from protecting their offspring by keeping cannibals away from the nest. We used 77 field observations of brown trout spawning to document the defensive behaviour of dominant males towards peripheral individuals before and after spawning, and test whether this behaviour was related to the probability of the clutch being cannibalised. We showed that dominant males stayed on the nest and chased peripherals even after the eggs were laid and fertilised. The number of chases performed by dominant males during the 2 min following spawning was negatively correlated to the probability of egg cannibalism. This result indicates that brown trout males can provide direct benefits to females through protection against egg cannibalism by peripheral individuals.

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“…A truncation within the distributions at a smaller grain size (e.g., 64 mm) was done in order to minimize the biases introduced by the over representation of large grains (BESCHTA and JACKSON, 1979;ADAMS and BESCHTA, 1980;YOUNG et al, 1991;WEIGELHOFER and WARINGER, 2003;DUMAS et al, 2007).…”

Section: Freeze Coringmentioning

confidence: 99%

Comparison of Different Techniques to Assess Surface and Subsurface Streambed Colmation with Fine Sediments

Descloux

Datry²,

Philippe³

et al. 2010

International Review of Hydrobiology

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International audienceMethods commonly used to assess physical colmation are mainly based on observations of streambed surface. These methods have been widely used but remain relatively subjective because of the observer effect. Visual estimation, penetrometry, hydraulic conductivity and wooden stake methods were applied to assess colmation conditions on 9 reaches with the objective of comparing them with the direct measurement of fine sediment content in subsurface habitat using the freeze coring method. The results demonstrated that surface estimation efficiency in separating colmation level is relatively poor and cannot indicate the colmation pattern of the subsurface zone and thus could not be a good indicator of internal colmation. Among the different techniques used to estimate subsurface colmation, wooden stakes and penetrometry have presented inconstant results in assessing internal colmation. A high correlation between percentage of fine sediments from freeze coring and hydraulic conductivity (R(2) = 0.98) was found. Hydraulic conductivity was therefore identified as the most accurate and robust method. Thus, this method could be proposed for large scale and long term colmation monitoring programs

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Survie Embryonnaire Du Saumon Atlantique (Salmo Salar L.) Dans Un Cours D’eau Du Sud De Son Aire De Répartition, La Nivelle

Cited by 9 publications

References 33 publications

Population differences in response to hypoxic stress in Atlantic salmon

Population differences in response to hypoxic stress in Atlantic salmon

Male antagonistic behaviour after spawning suggests paternal care in brown trout, Salmo trutta

Comparison of Different Techniques to Assess Surface and Subsurface Streambed Colmation with Fine Sediments

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