A1 Journal article (refereed)
Age is not just a number : Mathematical model suggests senescence affects how fish populations respond to different fishing regimes (2021)

Ahti, P. A., Uusi‐Heikkilä, S., Marjomäki, T. J., & Kuparinen, A. (2021). Age is not just a number : Mathematical model suggests senescence affects how fish populations respond to different fishing regimes. Ecology and Evolution, 11(19), 13363-13378. https://doi.org/10.1002/ece3.8058

JYU authors or editors

Publication details

All authors or editors: Ahti, Pauliina A.; Uusi‐Heikkilä, Silva; Marjomäki, Timo J.; Kuparinen, Anna

Journal or series: Ecology and Evolution

eISSN: 2045-7758

Publication year: 2021

Publication date: 07/09/2021

Volume: 11

Issue number: 19

Pages range: 13363-13378

Publisher: John Wiley & Sons

Publication country: United Kingdom

Publication language: English

DOI: https://doi.org/10.1002/ece3.8058

Publication open access: Openly available

Publication channel open access: Open Access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/77768

Additional information: The code used for the simulations is accessible in Dryad at https://doi.org/10.5061/dryad.c866t 1g7j.

Abstract

Senescence is often described as an age-dependent increase in natural mortality (known as actuarial senescence) and an age-dependent decrease in fecundity (known as reproductive senescence), and its role in nature is still poorly understood. Based on empirical estimates of reproductive and actuarial senescence, we used mathematical simulations to explore how senescence affects the population dynamics of Coregonus albula, a small, schooling salmonid fish. Using an empirically based eco-evolutionary model, we investigated how the presence or absence of senescence affects the eco-evolutionary dynamics of a fish population during pristine, intensive harvest, and recovery phases. Our simulation results showed that the presence or absence of senescence affected how the population responded to the selection regime. At an individual level, gillnetting caused a larger decline in asymptotic length when senescence was present, compared to the nonsenescent population, and the opposite occurred when fishing was done by trawling. This change was accompanied by evolution toward younger age at maturity. At the population level, the change in biomass and number of fish in response to different fishery size-selection patterns depended on the presence or absence of senescence. Since most life-history and fisheries models ignore senescence, they may be over-estimating reproductive capacity and under-estimating natural mortality. Our results highlight the need to understand the combined effects of life-history characters such as senescence and fisheries selection regime to ensure the successful management of our natural resources.

Keywords: fish populations; population dynamics; fishing; fishery; vendace; life cycle (natural science); mathematical models

Free keywords: eco- evolutionary dynamics; fisheries; life- history; senescence; trade- offs

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Ministry reporting: Yes

Reporting Year: 2021

JUFO rating: 1