Density-dependent consequences of size-selective induced life-history changes to population fitness in medaka (<i>Oryzias latipes</i>)

Evangelista, Charlotte; Vøllestad, Leif Asbjørn; Pauli, Beatriz Díaz; Édeline, Éric

doi:10.1139/cjfas-2019-0406

Cited by 6 publications

(12 citation statements)

References 40 publications

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“…First is an increased larvae–juvenile survival in LB populations compared with SB populations (in high fish density), second is an increased somatic grow rate of LB offspring that accelerates the larvae–juvenile transition and ultimately increases juvenile abundance. Altogether, these density-dependent effects highlight that LB fish cope better with competition, which could translate into higher population growth rate and maybe also a higher carrying capacity [ 23 ].…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, most fisheries management models assume that harvesting increases biomass production by populations [ 21 ]. However, harvest-induced evolution towards slower somatic growth might decrease the ability of exploited populations to cope with competition and to increase production in response to lower density and higher food availability [ 6 , 22 , 23 ]. To date, however, there is scant knowledge on the context-dependency of evolution-induced effects of harvesting (Environment × Evolution; but see [ 24 ]).…”

Section: Introductionmentioning

confidence: 99%

“…The selection procedure consisted of mimicking either fishing mortality where small-bodied individuals are favoured to reproduce (small-breeder SB line), or a more natural mortality regime that favours large-bodied individuals (large-breeder LB line) [ 25 , 26 ]. Under controlled laboratory conditions, the LB and SB lines evolved different life-history traits and behaviours: small-breeder medaka grew slower, matured earlier and were less willing to forage than the large-breeder medaka [ 23 , 25 , 27 ]. We hypothesized that: Medaka biomass production in terms of somatic growth and recruitment (larvae and juvenile recruitment) would be lower in populations composed of SB medaka (adapted to small-sized selection).…”

Section: Introductionmentioning

confidence: 99%

“…We hypothesized that: Medaka biomass production in terms of somatic growth and recruitment (larvae and juvenile recruitment) would be lower in populations composed of SB medaka (adapted to small-sized selection). This is because earlier reproduction at a smaller body size is associated with reduced fecundity and often reduced larval viability [ 23 , 28 ]. Further, a lower willingness to forage in the SB medaka may result in less energy available for somatic growth and reproduction.…”

Section: Introductionmentioning

confidence: 99%

“… The effect of size selection on fish biomass production and excretion rates would depend on environmental conditions. This is because SB medaka have lower capacity to cope with competition and lower foraging ability than LB medaka [ 23 , 27 ]. Therefore, we expected biomass production to be more negatively impacted by high fish density in the SB than in the LB line.…”

Section: Introductionmentioning

confidence: 99%

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Ecological ramifications of adaptation to size-selective mortality

et al. 2021

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Size-selective mortality due to harvesting is a threat to numerous exploited species, but how it affects the ecosystem remains largely unexplored. Here, we used a pond mesocosm experiment to assess how evolutionary responses to opposite size-selective mortality interacted with the environment (fish density and light intensity used as a proxy of resource availability) to modulate fish populations, prey community composition and ecosystem functions. We used medaka ( Oryzias latipes ) previously selected over 10 generations for small size (harvest-like selection; small-breeder line) or large size (large-breeder line), which displayed slow somatic growth and early maturity or fast somatic growth and late maturity, respectively. Large-breeder medaka produced more juveniles, which seemed to grow faster than small-breeder ones but only under high fish density. Additionally, large-breeder medaka had an increased impact on some benthic prey, suggesting expanded diet breadth and/or enhanced foraging abilities. As a consequence, increased light stimulated benthic algae biomass only in presence of large-breeder medaka, which were presumably better at controlling benthic grazers. Aggregated effect sizes at the community and ecosystem levels revealed that the ecological effects of medaka evolution were of similar magnitude to those induced by the environment and fish introduction. These findings indicate the important environmental dependency of evolutionary response to opposite size-selective mortality on higher levels of biological organizations.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ecological ramifications of adaptation to size-selective mortality

et al. 2021

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Determinants of survival and dispersal along the range expansion of a biological invasion

Édeline¹,

Starck²,

Bennevault³

et al. 2022

Preprint

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Projecting future response of biological systems to global change requires a mechanistic understanding of how climate and ecology jointly drive species demography and range dynamics. Such knowledge is particularly crucial when it comes to invasive species, which expansion may have far-reaching consequences for recipient ecosystems. Here, we use mark-recapture in replicated outdoor mesocosms to examine how survival and dispersal, two key drivers of population and range dynamics, respond to climate and ecology in the invasive red swamp crayfish (Procambarus clarkii) along an invasion gradient. We show that crayfish survival probability increased with (i) increasing body size at high (but not low) crayfish density and (ii) with warmer temperatures, and decreased (i) with increasing body condition and (ii) under higher crayfish density. Overland dispersal probability by crayfish increased with increasing (i) body-size, (ii) body condition and (iii) temperatures. In contrast, crayfish from range-edge and range-core habitats had similar survival and overland dispersal probabilities, suggesting no evolution of the crayfish expansion potential along the invasion gradient. Our results highlight that species population dynamics and range shifts in a changing world are driven by joint contributions from both climate and ecology. In P. clarkii, global warming will simultaneously promote both a demographic increase and a geographic range expansion, especially in populations dominated by large-bodied individuals.

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Within-species variation in the gut microbiome of medaka (Oryzias latipes) is driven by the interaction of light intensity and genetic background

Evangelista¹,

Kamenova

Pauli

et al. 2023

Preprint

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Gut microbiome diversity and functions are jointly shaped by the host's genetic background and environmental conditions, but the consequences of this interaction are still unclear. Unravelling the effect of the interaction between evolution and environment on the gut microbiome is particularly relevant considering the unprecedented level of human-driven disruption on the ecological and evolutionary trajectories of species. Here, we aimed to evaluate whether size-selective mortality influences the gut microbiome of medaka (Oryzias latipes), how environment conditions modulate the effect of the genetic background of medaka on their microbiota, and the association between microbiome diversity and medaka fitness. To do so, we studied two lineages of medaka that were raised under antagonistic size-selective regimes for 10 generations (i.e. the largest or the smallest breeders were removed to mimic fishing-like or natural mortality). In pond mesocosms, the two lineages were subjected to contrasting population density and light intensity (i.e. used as a proxy of primary production, hence resource availability). We observed significant differences in the gut microbiome composition and richness between the two lines, and this effect was mediated by light intensity. Indeed, the bacterial richness of fishing-like medaka (small-breeder line) was reduced by 34% under low-light conditions compared to high-light conditions, while it remained unchanged in natural mortality-selected medaka (large-breeder line). However, the observed changes in bacterial richness did not correlate with changes in growth rate or body condition, possibly due to functional redundancy among the microbial taxa residing in the gut. Given the growing evidence about the gut microbiomes importance to host health, more in-depth studies are required to fully understand the role of the microbiome in size-selected organisms and the possible ecosystem-level consequences.

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Density-dependent consequences of size-selective induced life-history changes to population fitness in medaka (Oryzias latipes)

Cited by 6 publications

References 40 publications

Ecological ramifications of adaptation to size-selective mortality

Ecological ramifications of adaptation to size-selective mortality

Determinants of survival and dispersal along the range expansion of a biological invasion

Within-species variation in the gut microbiome of medaka (Oryzias latipes) is driven by the interaction of light intensity and genetic background

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