Behavioral type, in interaction with body size, affects the recapture rate of brown trout<i>Salmo trutta</i>juveniles in their nursery stream

Näslund, Joacim; Wengström, Niklas; Wahlqvist, Fredrik; Aldvén, David; Závorka, Libor; Höjesjö, Johan

doi:10.1111/1749-4877.12323

Cited by 4 publications

(2 citation statements)

References 42 publications

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“…Some life history traits, for example, migratory and reproductive behavior, are influenced by intrinsic traits, for example, metabolism (Eldøy et al, 2021). These behaviors are, in turn, affected by environmental factors that may vary within populations over time and are governed by complex genetic architectures (Debes et al, 2021; Näslund et al, 2018). Further study on the dynamics of phenotypes and underlying genes is warranted.…”

Section: Discussionmentioning

confidence: 99%

Genomic dynamics of brown trout populations released to a novel environment

Kurland

Rafati

Ryman

et al. 2022

Ecology and Evolution

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Population translocations occur for a variety of reasons, from displacement due to climate change to human-induced transfers. Such actions have adverse effects on genetic variation and understanding their microevolutionary consequences requires monitoring. Here, we return to an experimental release of brown trout (Salmo trutta) in order to monitor the genomic effects of population translocations. In 1979, fish from each of two genetically (F ST = 0.16) and ecologically separate populations were simultaneously released, at one point in time, to a lake system previously void of brown trout. Here, whole-genome sequencing of pooled DNA (Pool-seq) is used to characterize diversity within and divergence between the introduced populations and fish inhabiting two lakes downstream of the release sites, sampled 30 years later (c. 5 generations). Present results suggest that while extensive hybridization has occurred, the two introduced populations are unequally represented in the lakes downstream of the release sites. One population, which is ecologically resident in its original habitat, mainly contributes to the lake closest to the release site. The other population, migratory in its natal habitat, is genetically more represented in the lake further downstream. Genomic regions putatively under directional selection in the new habitat are identified, where allele frequencies in both established populations are more similar to the introduced population stemming from a resident population than the migratory one. Results suggest that the microevolutionary consequences of population translocations, for example, hybridization and adaptation, can be rapid and that Pool-seq can be used as an initial tool to monitor genome-wide effects.

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Section: Discussionmentioning

confidence: 99%

Genomic dynamics of brown trout populations released to a novel environment

Kurland

Rafati

Ryman

et al. 2022

Ecology and Evolution

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“…However, earlier results suggest either that no activity related sampling bias occurs in our model species (i.e. brown trout) when recapturing using electric fishing (Adriaenssens & Johnsson, ), or that recapture probability is driven by an interaction between fish activity and body size (Näslund et al ., ). All these explanations can bias conclusions of mark‐recapture studies using repeated laboratory scoring of wild animals.…”

Section: Discussionmentioning

confidence: 97%

Laboratory captivity can affect scores of metabolic rates and activity in wild brown trout

et al. 2018

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Phenotypic scoring of wild animals under standardized laboratory conditions is important as it allows field ecologists and evolutionary biologists to understand the development and maintenance of interindividual differences in plastic traits (e.g. behaviour and physiology). However, captivity is associated with a shift from a natural familiar environment to an unfamiliar and artificial environment, which may affect estimates of plastic phenotypic traits. In this study, we tested how previous experience with laboratory environments and time spent in captivity affects behavioural (i.e. activity) and metabolic (i.e. standard and maximum metabolic rates) scoring of our model species, wild brown trout Salmo trutta. We found that individuals with previous experience of laboratory captivity (10.5 months earlier) showed higher activity in an open field test than individuals with no prior experience of laboratory captivity. Previous experience with captivity had no significant effect on metabolic rates. However, metabolic rates seemed to increase with increasing time spent in captivity prior to the collection of measurements. Although there are benefits of keeping wild animals in captivity prior to scoring, our results suggest that while allowing for sufficient acclimatization researchers should aim at minimizing time in captivity of wild animals to increase accuracy and ecological relevance of the scoring of plastic phenotypic traits.

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Within-stream phenotypic divergence in head shape of brown trout associated with invasive brook trout

Závorka

Larranaga

Wallerius

et al. 2019

Biological Journal of the Linnean Society

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Competition with a non-native species can lead to morphological changes in native organisms induced by phenotypic plasticity, and by selection against individuals that do not adjust their morphology to the novel selection pressure. The morphological changes in native organisms are often associated with rapid behavioural responses to competition with the invader. However, knowledge of the interaction between the behaviour and morphology of native organisms competing with a non-native species remains scarce. Here, we investigated the effect of competition with non-native brook trout Salvelinus fontinalis on head shape of native brown trout Salmo trutta in a stream system where changes in diet and territorial behaviour of sympatric brown trout have previously been demonstrated. We found that sympatric brown trout had smaller eyes, shorter lower jaws and more terminal mouth than allopatric conspecifics. These differences in head shape were highly repeatable over a period of 12 months. Apparent survival indicated that the selection on head shape of brown trout was weaker in the sympatric than in the allopatric stretch of the stream. The results suggest that these changes reinforce divergences of foraging strategies between the allopatric and sympatric brown trout, which can negatively affect their population dynamics and trophic function in the food-web.

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Behavioral type, in interaction with body size, affects the recapture rate of brown troutSalmo truttajuveniles in their nursery stream

Cited by 4 publications

References 42 publications

Genomic dynamics of brown trout populations released to a novel environment

Genomic dynamics of brown trout populations released to a novel environment

Laboratory captivity can affect scores of metabolic rates and activity in wild brown trout

Within-stream phenotypic divergence in head shape of brown trout associated with invasive brook trout

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