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Warmer and browner waters: fish responses vary with size, sex, and species

Van Dorst, Renee (2020). Warmer and browner waters: fish responses vary with size, sex, and species. Diss. (sammanfattning/summary) Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2020:38
ISBN 978-91-7760-594-2
eISBN 978-91-7760-595-9
[Doctoral thesis]

[img] PDF - Published Version


Current understanding of fish population responses to climate change is often limited to studies on the effect of temperature, ignoring potential co-occurring changes in other environmental variables. However, next to getting warmer, temperate and boreal aquatic systems are getting browner due to increased concentrations of dissolved organic carbon. Studies also generally predict mean population responses to climate change, thereby ignoring the potential for size, sex, and also species-specific responses.
In this thesis, I aim to study the effects of warmer and browner waters on individual and population level responses in fish, and investigate if these responses vary with size, sex, and between species (Eurasian perch, Perca fluviatilis or common roach, Rutilus rutilus). To do this I used multiple methods, including space-for-time analyses, a wholeecosystem warming experiment, and aquaria and mesocosm experiments.
I found that both warming and browning of lakes will likely decrease fish biomass production. Warming may cause a shift in size-structure towards smaller perch individuals and a lower perch population biomass, while browning will likely affect perch biomass production through lower body growth. Body growth responses to warming likely depend on body size, as small but not large individuals in my study were positively affected by high temperatures, and also sex, as males were more negatively affected by warming than females. Responses to browning may vary with body size and between species, as I found browning had a stronger negative effect on body growth of larger individuals in perch, while in roach browning only affected very small individuals.
Overall, my findings suggest that future warming and browning will negatively affect fish individuals and populations, but that responses will vary with size, sex, and species, with potential consequences for ecological interactions and ecosystem functioning. This thesis highlights the importance of considering multiple climate stressors, integrating responses across several levels of biological organization, and acknowledging withinand between species variation, in order to understand and predict fish population responses to further climate change.

Authors/Creators:Van Dorst, Renee
Title:Warmer and browner waters: fish responses vary with size, sex, and species
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2020
Number of Pages:60
Publisher:Department of Aquatic Resources, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-7760-594-2
ISBN for electronic version:978-91-7760-595-9
Publication Type:Doctoral thesis
Article category:Other scientific
Version:Published version
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
Keywords:climate change, warming, browning, lakes, body growth, biomass production, ontogeny, size-specific responses, sex-specific responses, perch, roach
Permanent URL:
ID Code:17355
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Department of Aquatic Resources
Deposited By: SLUpub Connector
Deposited On:13 Aug 2020 11:36
Metadata Last Modified:15 Jan 2021 19:47

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