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Multiple-batch spawning: a risk-spreading strategy disarmed by highly intensive size-selective fishing rate.

ABSTRACT: Can the advantage of risk-managing life-history strategies become a disadvantage under human-induced evolution? Organisms have adapted to the variability and uncertainty of environmental conditions with a vast diversity of life-history strategies. One such evolved strategy is multiple-batch spawning, a spawning strategy common to long-lived fishes that 'hedge their bets' by distributing the risk to their offspring on a temporal and spatial scale. The fitness benefits of this spawning strategy increase with female body size, the very trait that size-selective fishing targets. By applying an empirically and theoretically motivated eco-evolutionary mechanistic model that was parameterized for Atlantic cod (Gadus morhua), we explored how fishing intensity may alter the life-history traits and fitness of fishes that are multiple-batch spawners. Our main findings are twofold; first, the risk-spreading strategy of multiple-batch spawning is not effective against fisheries selection, because the fisheries selection favours smaller fish with a lower risk-spreading effect; and second, the ecological recovery in population size does not secure evolutionary recovery in the population size structure. The beneficial risk-spreading mechanism of the batch spawning strategy highlights the importance of recovery in the size structure of overfished stocks, from which a full recovery in the population size can follow.

SUBMITTER: Hocevar S

PROVIDER: S-EPMC9428534 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature

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Multiple-batch spawning: a risk-spreading strategy disarmed by highly intensive size-selective fishing rate.

Hočevar Sara S Hutchings Jeffrey A JA Kuparinen Anna A

Proceedings. Biological sciences 20220831 1981

Can the advantage of risk-managing life-history strategies become a disadvantage under human-induced evolution? Organisms have adapted to the variability and uncertainty of environmental conditions with a vast diversity of life-history strategies. One such evolved strategy is multiple-batch spawning, a spawning strategy common to long-lived fishes that 'hedge their bets' by distributing the risk to their offspring on a temporal and spatial scale. The fitness benefits of this spawning strategy in ...[more]

PMID: 36043282

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Dataset Information

Multiple-batch spawning: a risk-spreading strategy disarmed by highly intensive size-selective fishing rate.

Publications

Multiple-batch spawning: a risk-spreading strategy disarmed by highly intensive size-selective fishing rate.

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