RT Journal Article
T1 Phytoplankton size scaling with nutrient concentration
A1 Beltrán De Heredia Rodríguez, Elena
A1 Aksnes, Dag L.
A1 Cao García, Francisco Javier
AB Phytoplankton, the autotrophic component of the plankton community, is a key factor in oceanic ecosystems and in biogeochemical cycling. Over much of the ocean, phytoplankton growth is limited by nitrogen uptake (as nitrate), which is commonly described in ecosystem modelling by the Michaelis-Menten equation: V = Vmax S/(K + S). Previous phytoplankton data compilations have shown that the maximum uptake rate, Vmax, and the half-saturation constant, K, increase with organism size. Independent studies have also reported that K increases with nitrate concentration, S. Here, we assume that this K increase with S is due to an increase in the dominant organism size in the phytoplankton community with increasing nutrient concentration. Previous studies support this assumption, showing that nitrate abundance is the main factor determining dominant organism size. Based on this assumption and on previously published experimental observations for K, we show that phytoplankton dominant size, r, scales approximately with S0.85. This increase in dominant size can also entail size-related changes in traits (such as the number of porters) that impact K and Vmax. Furthermore, by combining a trait-based uptake model with the experimental results of K and Vmax, we derive scaling relations for the number of porters and the handling time in terms of r. Our results indicate that handling time decreases approximately with r-0.90 while porter number increases approximately with r1.56. These results may be useful in characterizing size-dependent nutrient uptake in marine ecosystems and biogeochemical cycling models.
PB Inter-Research Science Publisher
SN 0171-8630
YR 2017
FD 2017-05-17
LK https://hdl.handle.net/20.500.14352/104592
UL https://hdl.handle.net/20.500.14352/104592
LA eng
NO Beltrán-Heredia, E., Aksnes, D. L., & Cao, F. J. (2017). Phytoplankton size scaling with nutrient concentration. Marine Ecology Progress Series, 571, 59-64.
NO Espacio Económico Europeo
NO Ministerio de Educación, Cultura y Deporte (España)
NO Banco de Santander
NO Universidad Complutense de Madrid
NO Ministerio de Economía y Competitividad (España)
DS Docta Complutense
RD 4 abr 2025