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Temperature- and body size scaling

effects on individuals, populations and food webs

Lindmark, Max (2020). Temperature- and body size scaling. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2020:8
ISBN 978-91-7760-534-8
eISBN 978-91-7760-535-5
[Doctoral thesis]

[img] PDF - Published Version


Climate warming impacts organisms directly through changes in their physiology. Empirical evidence suggest warming has already led to changes in growth, body size, population and community size-structure of natural populations. However, it is difficult to understand the underlying mechanisms from observational data alone. Therefore, it is important to develop mechanistic population- and food web models grounded in a physiological description of individual life history. This requires knowledge on how physiological processes scale with body size and temperature within species and how those are mediated by ecological interactions, which hitherto is largely unexplored. In this thesis, I collated data sets through standardized literature searches to understand how body growth, metabolism and consumption rate scale with body mass within species of fish using hierarchical modelling approaches. I also expanded population and food web models to include temperature dependence of physiological rates. I characterize the intraspecific scaling of abovementioned rates and find that the optimum growth temperature of an individual fish declines as it grows in body mass. Using dynamical models, I show that even simple stage-structure within species together with food dependent ontogenetic development can lead to very different responses to warming compared to similar, but unstructured, population and community models. These include sudden shifts in stage-structure, collapses of top predators and bistability. Analysis of a size-structured model reveals that initial warming can lead to faster growth rates, but this does not lead to larger-sized populations if also basal resources decline with warming. These findings contribute to a broader understanding of the role of intraspecific sizevariation for understanding how climate change impacts population and community structure and dynamics. They also highlight the importance of evaluating physiological responses to warming in an ecological context, as optimum temperatures for growth decline with both body size and reduced food availability.

Authors/Creators:Lindmark, Max
Title:Temperature- and body size scaling
Subtitle:effects on individuals, populations and food webs
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2020
Number of Pages:58
ILindmark*, M., Ohlberger, J., Gårdmark, A. Intraspecific scaling of growth, consumption and metabolism with temperature and body mass across fishes (manuscript)
IILindmark*, M., Huss, M., Ohlberger, J., Gårdmark, A. (2018). Temperature-dependent body size effects determine population responses to warming. Ecology Letters, 21 (2), pp. 181-189.
IIILindmark*, M., Ohlberger, J., Huss, M., Gårdmark, A. (2019). Size-based ecological interactions drive food web responses to climate warming. Ecology Letters, 22 (5), pp. 778-786.
IVLindmark*, M., Audzijonyte, A., Blanchard, J. L, Gårdmark, A. Bottom up and top down effects of temperature on body growth, population sizespectra and yield – an application of a multispecies size-spectrum model (manuscript)
Place of Publication:Uppsala
Publisher:Department of Aquatic Resources, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-7760-534-8
ISBN for electronic version:978-91-7760-535-5
Publication Type:Doctoral thesis
Article category:Other scientific
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, community dynamics, size-structure, temperature, metabolic scaling, intraspecific interactions, allometry, consumer-resource dynamics, food webs, temperature-size rule
Permanent URL:
ID Code:16711
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Department of Aquatic Resources
Deposited By: SLUpub Connector
Deposited On:26 Feb 2020 12:59
Metadata Last Modified:15 Jan 2021 19:26

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