Affiliation:
1. Division for Marine and Environmental Research Ruđer Bošković Institute Zagreb Croatia
2. Center for Marine Research Ruđer Bošković Institute Rovinj Croatia
3. Climate and Environmental Physics, Physics Institute University of Bern Bern Switzerland
4. Oeschger Centre for Climate Change Research University of Bern Bern Switzerland
5. Center for Bioresources, Division of food and production Danish Technological Institute Taastrup Denmark
Abstract
AbstractMarine life is threatened by global warming and its indirect consequences, which include, among others, increased stratification leading to phosphorus (P) and nitrogen depletion in the upper water column. Phosphorus plays a key role in all biochemical systems; storage of metabolic energy, formation of genetic material, and subcellular compartmentalization. Our multi‐year study of lipid biogeochemistry in the northern Adriatic (Mediterranean), which is becoming warmer and nutrient‐poorer, particularly regarding P, has shown that under conditions of P scarcity, phospholipids are relatively more abundant and smaller plankton cells dominate. Consistent with the field data, experiments with seven phytoplankton monocultures, comprising microplankton, nanoplankton, and picoplankton, confirmed a relatively higher phospholipid content in the smaller phytoplankton species and, in particular, an increase in those grown under stress conditions in general, including, unexpectedly, P‐limitation. We suggest two reasons for the observed “P paradox” of P‐limited phytoplankton: (1) cell geometry: volume of the plasma membrane relative to the volume of the entire cell is greater in smaller cells and, therefore, the proportion of plasma membrane phospholipids to intracellular lipids is greater in smaller cells, (2) higher proportion of densely packed saturated fatty acids found in stressful conditions, including P oligotrophy, additionally increase the proportion of membrane phospholipids relative to intracellular lipids. Our findings contribute to the understanding of P cycling in the sea. In addition, our data suggest that higher phospholipid export to deep waters is possible by smaller plankton.
Funder
European Molecular Biology Organization
Hrvatska Zaklada za Znanost
Subject
Aquatic Science,Oceanography
Cited by
2 articles.
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