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
Contributing organizations
Related projects
- Complex eco-evolutionary dynamics of aquatic ecosystems
faced with human-induced and environmental stress- Kuparinen, Anna
- Research Council of Finland
- Fisheries selection and the components of adaptive potential
- Uusi-Heikkilä, Silva
- Research Council of Finland
- Resolving complex eco-evolutionary dynamics of aquatic ecosystems faced with human-induced and environmental alterations
- Kuparinen, Anna
- European Commission
Ministry reporting: Yes
Reporting Year: 2021
JUFO rating: 1