Temperature sensitivities of microbial plankton net growth rates are seasonally coherent and linked to nutrient availability

Environmental Microbiology
Xosé Anxelu G MoránTamara M Huete-Stauffer

Abstract

Recent work suggests that temperature effects on marine heterotrophic bacteria are strongly seasonal, but few attempts have been made to concurrently assess them across trophic levels. Here, we estimated the temperature sensitivities (using activation energies, E) of autotrophic and heterotrophic microbial plankton net growth rates over an annual cycle in NE Atlantic coastal waters. Phytoplankton grew in winter and late autumn (0.41 ± 0.16 SE d-1 ) and decayed in the remaining months (-0.42 ± 0.10 d-1 ). Heterotrophic microbes shared a similar seasonality, with positive net growth for bacteria (0.14-1.48 d-1 ), while nanoflagellates had higher values (> 0.4 d-1 ) in winter and spring relative to the rest of the year (-0.46 to 0.29 d-1 ). Net growth rates activation energies showed similar dynamics in the three groups (-1.07 to 1.51 eV), characterized by maxima in winter, minima in summer and resumed increases in autumn. Microbial plankton E values were significantly correlated with nitrate concentrations as a proxy for nutrient availability. Nutrient-sufficiency (i.e., > 1 μmol l-1 nitrate) resulted in significantly higher activation energies of phytoplankton and heterotrophic nanoflagellates relative to nutrient-limited condit...Continue Reading

References

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Jun 13, 2015·Proceedings. Biological Sciences·Xosé Anxelu G MoránTamara M Huete-Stauffer
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Sep 13, 2015·FEMS Microbiology Ecology·Tamara Megan Huete-StaufferXosé Anxelu G Morán
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Apr 27, 2018·The ISME Journal·Emilio MarañónBeatriz Mouriño-Carballido

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Citations

Jan 23, 2019·Frontiers in Microbiology·Luis SilvaXosé Anxelu G Morán
Apr 9, 2020·Frontiers in Microbiology·Laura Alonso-SáezJosé M González
Nov 30, 2019·Scientific Reports·Natalia González-BenítezJean-Pierre Gattuso
May 28, 2021·Frontiers in Microbiology·Abbrar LabbanXosé Anxelu G Morán

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