A1 Journal article (refereed)
Divergent temperature-specific metabolic and feeding rates of native and invasive crayfish (2022)

Ruokonen, T. J., & Karjalainen, J. (2022). Divergent temperature-specific metabolic and feeding rates of native and invasive crayfish. Biological Invasions, 24(3), 787-799. https://doi.org/10.1007/s10530-021-02687-1

JYU authors or editors

Publication details

All authors or editors: Ruokonen, T. J.; Karjalainen, J.

Journal or series: Biological Invasions

ISSN: 1387-3547

eISSN: 1573-1464

Publication year: 2022

Publication date: 27/11/2021

Volume: 24

Issue number: 3

Pages range: 787-799

Publisher: Springer Science and Business Media LLC

Publication country: Netherlands

Publication language: English

DOI: https://doi.org/10.1007/s10530-021-02687-1

Publication open access: Openly available

Publication channel open access: Partially open access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/79232


Temperature is one of the most important factors governing the activity of ectothermic species, and it plays an important but less studied role in the manifestation of invasive species impacts. In this study, we investigated temperature-specific feeding and metabolic rates of invasive and native crayfish, and evaluated how temperature regulates their ecological impacts at present and in future according to different climatic scenarios by bioenergetics modelling. We conducted a series of maximum food consumption experiments and measured the metabolic rates of cold-adapted native noble crayfish (Astacus astacus) and invasive signal crayfish (Pacifastacus leniusculus) originally from a warmer environment over a temperature gradient resembling natural temperatures in Finland. The maximum feeding rates and routine metabolic rates (RMR) of native noble crayfish were significantly higher at low temperatures (< 10 °C than the rates of invasive signal crayfish. The RMRs of the species crossed at 18 °C, and the RMRs of signal crayfish were higher at temperatures above 18 °C. These findings indicate that the invader’s thermal niche has remained stable, and the potential impacts per capita are lower at suboptimal cold temperatures than for the native species. Our bioenergetics modelling showed that the direct annual predation impact of noble and signal crayfish seem similar, although the seasonal dynamics of the predation differs considerably between species. Our results highlight that the temperature-specific metabolic and feeding rates of species need to be taken into account in the impact assessment instead of simple generalisations of the direction or magnitude of impacts.

Keywords: bioenergetics; metabolism; temperature; climate changes; ecological niche; introduced species; crayfish; Astacus astacus; Pacifastacus leniusculus

Free keywords: Astacus astacus; bioenergetics; maximum consumption; niche conservatism; metabolic rate; Pacifastacus leniusculus

Contributing organizations

Ministry reporting: Yes

Preliminary JUFO rating: 1

Last updated on 2022-05-04 at 08:25