The allometry of the smallest: superlinear scaling of microbial metabolic rates in the Atlantic Ocean
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AuthorsGarcía-García, F.C. (Francisca del Carmen); Garcia-Martin, EE; Taboada, FG; Sal, S. (Sofía); Serret, P; López-Urrutia-Lorente, Á. (Ángel)
Prokaryotic planktonic organisms are small in size but largely relevant in marine biogeochemical cycles. Due to their reduced size range (0.2 to 1 mu m in diameter), the effects of cell size on their metabolism have been hardly considered and are usually not examined in field studies. Here, we show the results of size-fractionated experiments of marine microbial respiration rate along a latitudinal transect in the Atlantic Ocean. The scaling exponents obtained from the power relationship between respiration rate and size were significantly higher than one. This superlinearity was ubiquitous across the latitudinal transect but its value was not universal revealing a strong albeit heterogeneous effect of cell size on microbial metabolism. Our results suggest that the latitudinal differences observed are the combined result of changes in cell size and composition between functional groups within prokaryotes. Communities where the largest size fraction was dominated by prokaryotic cyanobac ...
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