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Morphology-based differences in the thermal response of freshwater phytoplankton.


ABSTRACT: The thermal response of maximum growth rate in morphology-based functional groups (MBFG) of freshwater phytoplankton is analysed. Contrasting an exponential Boltzmann-Arrhenius with a unimodal model, three main features were evaluated: (i) the activation energy of the rise (Er), (ii) the presence of a break in the thermal response and (iii) the activation energy of the fall (Ef). The whole dataset (N = 563) showed an exponential increase (Er ? 0.5), a break around 24°C and no temperature dependence after the breakpoint (Ef = 0). Contrasting thermal responses among MBFG were found. All groups showed positive activation energy (Er > 0), four showed no evidence of decline in growth rate (temperature range = 0-35°C) and two presented a breakpoint followed by a sharp decrease in growth rate. Our results evidenced systematic differences between MBFG in the thermal response and a coherent response significantly related to morphological traits other than size (i.e. within MBFG). These results provide relevant information for water quality modelling and climate change predictions.

SUBMITTER: Segura AM 

PROVIDER: S-EPMC6012694 | biostudies-literature | 2018 May

REPOSITORIES: biostudies-literature

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Morphology-based differences in the thermal response of freshwater phytoplankton.

Segura Angel M AM   Sarthou Florencia F   Kruk Carla C  

Biology letters 20180501 5


The thermal response of maximum growth rate in morphology-based functional groups (MBFG) of freshwater phytoplankton is analysed. Contrasting an exponential Boltzmann-Arrhenius with a unimodal model, three main features were evaluated: (i) the activation energy of the rise (<i>E</i><sub>r</sub>), (ii) the presence of a break in the thermal response and (iii) the activation energy of the fall (<i>E</i><sub>f</sub>). The whole dataset (<i>N</i> = 563) showed an exponential increase (<i>E</i><sub>r  ...[more]

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