Sexual behaviour of a Masu salmon parr, with implications for the evolution of parr sexual behaviour in the salmonines

Esteve, Manu; McLennan, Deborah A.; Kawahara, Mitsuru

doi:10.1111/j.1600-0633.2010.00455.x

Cited by 6 publications

(3 citation statements)

References 16 publications

(28 reference statements)

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“…The spawning group of masu salmon consists of a female and several males including both migrants and residents (Watanabe et al 2008;Esteve et al 2011). Migrant males attack other males, whereas resident males adopt a sneaking tactic (Koseki and Maekawa 2000;Watanabe et al 2008).…”

Section: Evolutionary Change Of the Threshold Traitmentioning

confidence: 99%

“…Migrant males attack other males, whereas resident males adopt a sneaking tactic (Koseki and Maekawa 2000;Watanabe et al 2008). Further, sneaker males attack each other, resulting in a dominance hierarchy among sneaker males (Koseki and Maekawa 2000;Esteve et al 2011). Due to this interference competition, the competitive ability of resident males with body size x becomes a decreasing function of the density of resident males larger than x.…”

Section: Evolutionary Change Of the Threshold Traitmentioning

confidence: 99%

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Eco-evolutionary dynamics may show an irreversible regime shift, illustrated by salmonids facing climate change

2021

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The enhanced or reduced growth of juvenile masu salmon (Oncorhynchus masou masou) may result from climate changes to their environment and thus impact on the eco-evolutionary dynamics of their life-history choices. Male juveniles with status, i.e., if their body size is larger than a threshold, stay in the stream and become resident males reproducing for multiple years, while those with smaller status, i.e., their body size is below the threshold, migrate to the ocean and return to the stream one year later to reproduce only once. Since juvenile growth is suppressed by the density of resident males, the fraction of resident males may stay in equilibrium or fluctuate wildly over a 2-year period. When the threshold value evolves, the convergence stable strategy may generate either an equilibrium or large fluctuations of male residents. If environmental changes occur faster than the rate of evolutionary adaptation, the eco-evolutionary dynamics exhibit a qualitative shift in the population dynamics. We also investigated the relative assessment models, in which individual life-history choices are made based on the individual’s relative status within the juvenile population. The eco-evolutionary dynamics are very different from the absolute assessment model, demonstrating the importance of understanding the mechanisms of life history choices when predicting the impacts of climate change.

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Section: Evolutionary Change Of the Threshold Traitmentioning

confidence: 99%

Section: Evolutionary Change Of the Threshold Traitmentioning

confidence: 99%

Eco-evolutionary dynamics may show an irreversible regime shift, illustrated by salmonids facing climate change

2021

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“…Larger male juveniles tend to choose the resident tactic, which is common throughout salmonids (Aubin-Horth and Dodson, 2004;Piché et al, 2008). This trend can be explained by the competition among these fishes, as residents suffer from intensive competition for both spawning and feeding opportunities, resulting in a dominance hierarchy among residents (Nakano, 1995;Esteve, 2011). Consequently, the reproductive success of an individual adopting the resident tactic strongly correlates with their body size in the juvenile state, because they mature at younger ages without experiencing a feeding migration (Morita et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Positive Feedback between Behavioral and Hormonal Dynamics Leads to Differentiation of Life-History Tactics

Horita

Iwasa²,

Tachiki

2020

The American Naturalist

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Competitive interaction among individuals of a single population may result in the differentiation to two or more distinct life history tactics. For example, although they exhibit unimodal size distribution, male juveniles of salmonids differentiate into those going down to the ocean for growth and returning after several years to the natal stream for reproduction (migratory tactic) and those staying in the stream and reproducing for multiple years (resident tactic). In this study, we developed a simple mathematical model for the positive feedback between hormonal and behavioral dynamics, with the expectation of establishing multiple discrete clusters of hormone levels leading to differentiation of life-history tactics. The assumptions were that probability of winning in fighting depends both on the body size and hormone level of the two contestants. An individual with a higher hormone level would be more likely to win the competition, which further enhanced hormone production, forming a positive feedback loop between hormone level and fighting ability. If the positive feedback was strong but not excessive, discrete clusters of hormone level emerged from a continuous distribution. In contrast, no clear clustering structure appeared in the distribution of hormone levels if the winning probability in fighting was controlled by the body size.

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An age‐stage structured population model for the coexistence of alternative migratory tactics in salmonid fishes

Horita,

Takada,

Tachiki

2024

Population Ecology

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Alternative tactics refer to the discontinuous patterns of phenotypic variation, often expressed as an association of several phenotypes. These tactics are widely observed in several taxa, with individuals in a population choosing a phenotype from multiple options depending on their status. In salmonids, alternative migratory tactics‐where some individuals undergo feeding migration to the ocean and others remain in their natal streams are associated with exaggerated phenotypic variations. Such discrete alternative phenotypes can have complex impacts on ecological and evolutionary processes (e.g., reproduction and the trait changes due to natural selection) owing to the large differences in demographic rates between tactics. In this study, to explore the eco‐evolutionary consequences of alternative migratory tactics in salmonid fishes, we constructed an age‐stage structured population model focusing on females. As individuals choose a tactic based on their own status, we incorporated the size structure of juveniles into the population dynamics and explored the evolution of the threshold trait. At the evolutionary endpoint, the threshold trait maximized the population size. Furthermore, the coexistence of resident and migrant tactics within a population occurred when the river environment was relatively poor and/or the ocean environment was rich; otherwise, all individuals adopted the resident tactic. This model provides several insights into the eco‐evolutionary response of the population to environmental change. For example, the increase in survivorship during migration increased the population size and the fraction of migrants as an ecological and evolutionary response, respectively.

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Sexual behaviour of a Masu salmon parr, with implications for the evolution of parr sexual behaviour in the salmonines

Cited by 6 publications

References 16 publications

Eco-evolutionary dynamics may show an irreversible regime shift, illustrated by salmonids facing climate change

Eco-evolutionary dynamics may show an irreversible regime shift, illustrated by salmonids facing climate change

Positive Feedback between Behavioral and Hormonal Dynamics Leads to Differentiation of Life-History Tactics

An age‐stage structured population model for the coexistence of alternative migratory tactics in salmonid fishes

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