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

Biol Lett

Modelización y análisis de Recursos Naturales, Centro Universitario Regional Este, Universidad de la República, Ruta 9 y 15, Rocha, Uruguay.

Published: May 2018

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 (), (ii) the presence of a break in the thermal response and (iii) the activation energy of the fall (). The whole dataset ( = 563) showed an exponential increase ( ∼ 0.5), a break around 24°C and no temperature dependence after the breakpoint ( = 0). Contrasting thermal responses among MBFG were found. All groups showed positive activation energy ( > 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.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6012694PMC
http://dx.doi.org/10.1098/rsbl.2017.0790DOI Listing

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