Intra- and interspecific densities shape life-history traits in a salmonid population

Montorio, Lucie; Evanno, Guillaume; Nevoux, Marie

doi:10.1007/s00442-018-4213-4

Cited by 8 publications

(8 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Montorio et al . () found that for S. trutta , first‐year density showed no correlation with migration although it correlated negatively with first‐winter survival and body size; the latter potentially resulting in delayed migration (see below). However, S. salar density was found to be positively correlated with S. trutta migration, indicating interspecific competition.…”

Section: Genetic and Environmental Determinants Of Facultative Migrationmentioning

confidence: 97%

Anadromy, potamodromy and residency in brown trout Salmo trutta: the role of genes and the environment

Ferguson

Reed

Cross

et al. 2019

Journal of Fish Biology

153

176

View full text Add to dashboard Cite

Brown trout Salmo trutta is endemic to Europe, western Asia and north‐western Africa; it is a prominent member of freshwater and coastal marine fish faunas. The species shows two resident (river‐resident, lake‐resident) and three main facultative migratory life histories (downstream–upstream within a river system, fluvial–adfluvial potamodromous; to and from a lake, lacustrine–adfluvial (inlet) or allacustrine (outlet) potamodromous; to and from the sea, anadromous). River‐residency v. migration is a balance between enhanced feeding and thus growth advantages of migration to a particular habitat v. the costs of potentially greater mortality and energy expenditure. Fluvial–adfluvial migration usually has less feeding improvement, but less mortality risk, than lacustrine–adfluvial or allacustrine and anadromous, but the latter vary among catchments as to which is favoured. Indirect evidence suggests that around 50% of the variability in S. trutta migration v. residency, among individuals within a population, is due to genetic variance. This dichotomous decision can best be explained by the threshold‐trait model of quantitative genetics. Thus, an individual's physiological condition (e.g., energy status) as regulated by environmental factors, genes and non‐genetic parental effects, acts as the cue. The magnitude of this cue relative to a genetically predetermined individual threshold, governs whether it will migrate or sexually mature as a river‐resident. This decision threshold occurs early in life and, if the choice is to migrate, a second threshold probably follows determining the age and timing of migration. Migration destination (mainstem river, lake, or sea) also appears to be genetically programmed. Decisions to migrate and ultimate destination result in a number of subsequent consequential changes such as parr–smolt transformation, sexual maturity and return migration. Strong associations with one or a few genes have been found for most aspects of the migratory syndrome and indirect evidence supports genetic involvement in all parts. Thus, migratory and resident life histories potentially evolve as a result of natural and anthropogenic environmental changes, which alter relative survival and reproduction. Knowledge of genetic determinants of the various components of migration in S. trutta lags substantially behind that of Oncorhynchus mykiss and other salmonines. Identification of genetic markers linked to migration components and especially to the migration–residency decision, is a prerequisite for facilitating detailed empirical studies. In order to predict effectively, through modelling, the effects of environmental changes, quantification of the relative fitness of different migratory traits and of their heritabilities, across a range of environmental conditions, is also urgently required in the face of the increasing pace of such changes.

show abstract

Section: Genetic and Environmental Determinants Of Facultative Migrationmentioning

confidence: 97%

Anadromy, potamodromy and residency in brown trout Salmo trutta: the role of genes and the environment

Ferguson

Reed

Cross

et al. 2019

Journal of Fish Biology

153

176

View full text Add to dashboard Cite

show abstract

“…In addition, their more streamlined body shape and larger pectoral fins are assumed to give young Atlantic salmon a selective advantage in rapidly flowing rivers (Karlström, 1977), and they may outcompete trout in fast-flowing streams (Montorio, Evanno, & Nevoux, 2018). In addition, their more streamlined body shape and larger pectoral fins are assumed to give young Atlantic salmon a selective advantage in rapidly flowing rivers (Karlström, 1977), and they may outcompete trout in fast-flowing streams (Montorio, Evanno, & Nevoux, 2018).…”

Section: Interspecific Competitionmentioning

confidence: 99%

“…Atlantic salmon, on the other hand, make more use of cover, deep pools and fast-flowing riffles where food is difficult to defend. In addition, their more streamlined body shape and larger pectoral fins are assumed to give young Atlantic salmon a selective advantage in rapidly flowing rivers (Karlström, 1977), and they may outcompete trout in fast-flowing streams (Montorio, Evanno, & Nevoux, 2018).…”

Section: Interspecific Competitionmentioning

confidence: 99%

See 1 more Smart Citation

Environmental influences on life history strategies in partially anadromous brown trout (Salmo trutta, Salmonidae)

et al. 2019

Self Cite

View full text Add to dashboard Cite

This paper reviews the life history of brown trout and factors influencing decisions to migrate. Decisions that maximize fitness appear dependent on size at age. In partly anadromous populations, individuals that attain maturity at the parr stage typically become freshwater resident. For individual fish, the life history is not genetically fixed and can be modified by the previous growth history and energetic state in early life. This phenotypic plasticity may be influenced by epigenetic modifications of the genome. Thus, factors influencing survival and growth determine life‐history decisions. These are intra‐ and interspecific competition, feeding and shelter opportunities in freshwater and salt water, temperature in alternative habitats and flow conditions in running water. Male trout exhibit alternative mating strategies and can spawn as a subordinate sneaker or a dominant competitor. Females do not exhibit alternative mating behaviour. The relationship between growth, size and reproductive success differs between sexes in that females exhibit a higher tendency to migrate than males. Southern populations are sensitive to global warming. In addition, fisheries, aquaculture with increased spreading of salmon lice, introduction of new species, weirs and river regulation, poor water quality and coastal developments all threaten trout populations. The paper summarizes life‐history data from six populations across Europe and ends by presenting new research questions and directions for future research.

show abstract

“…Hodge et al 2016). Thus, while spawning segregation can imply a strong heritability of migratory behaviour, as observed in some salmonid fishes (Berejikian et al 2014;Debes et al 2020), other factors such as body size, inter-and intrapopulation density, predation risk, temperature and/or resource availability may influence whether an individual fish undertakes a migration (Brodersen et al 2011;Skov et al 2011;Montorio et al 2018). Across multiple years, the decision to migrate can depend on prevailing conditions, although in the cyprinid fish roach Rutilus rutilus, overwintering migratory strategy was largely consistent within individuals over time (Brodersen et al 2014).…”

Section: Introductionmentioning

confidence: 98%

Acoustic telemetry reveals strong spatial preferences and mixing during successive spawning periods in a partially migratory common bream population

Winter

Hindes²,

Lane

et al. 2021

Aquat Sci

View full text Add to dashboard Cite

Partial migration, whereby a population comprises multiple behavioural phenotypes that each have varying tendencies to migrate, is common among many animals. Determining the mechanisms by which these phenotypes are maintained is important for understanding their roles in population structure and stability. The aim here was to test for the temporal and spatial consistency of migratory phenotypes in a common bream Abramis brama (‘bream’) population, and then determine their social preferences and extent of mixing across three successive annual spawning periods. The study applied passive acoustic telemetry to track the movements of bream in the River Bure system of the Norfolk Broads, a lowland wetland comprising highly connected riverine and lacustrine habitats. Analyses revealed that individual migratory phenotype was highly consistent across the 3 years, but this was not predicted by fish sex or length at tagging. During the annual spawning periods, network analyses identified off-channel areas visited by both resident and migrant fish that, in non-spawning periods, were relatively independent in their space use. Within these sites, the co-occurrence of bream was non-random, with individuals forming more preferred associations than expected by chance. These associations were not strongly predicted by similarity in fish length, sex or behavioural phenotype, indicating that the resident and migrant phenotypes mixed during their annual spawning periods. The results suggested these different phenotypes, with spatially distinct resource use in non-spawning periods, comprised a single population, with this having important implications for the management of this wetland resource.

show abstract

Intra- and interspecific densities shape life-history traits in a salmonid population

Cited by 8 publications

References 56 publications

Anadromy, potamodromy and residency in brown trout Salmo trutta: the role of genes and the environment

Anadromy, potamodromy and residency in brown trout Salmo trutta: the role of genes and the environment

Environmental influences on life history strategies in partially anadromous brown trout (Salmo trutta, Salmonidae)

Acoustic telemetry reveals strong spatial preferences and mixing during successive spawning periods in a partially migratory common bream population

Contact Info

Product

Resources

About