Lipids of different phytoplankton groups differ in sensitivity to degradation: Implications for carbon export

Godrijan, Jelena; Pfannkuchen, Daniela Marić; Djakovac, Tamara; Frka, Sanja; Gašparović, Blaženka

doi:10.1111/gcb.16839

Cited by 2 publications

(1 citation statement)

References 92 publications

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“…Specifically, when the high N and P concentrations enter the northwestern Adriatic through the Po River (Sta. 108) they allow for a strong bloom(s) to develop, particularly dominated by diatoms (Godrijan et al 2023). However, due to the high riverine imbalance of N and P (DIN/PO 4 3À = 37-418; Cozzi and Giani 2011), PO 4 3À is used up while plenty of DIN remains.…”

Section: Discussionmentioning

confidence: 99%

Paradox of relatively more phospholipids in phytoplankton in phosphorus limited sea

Gašparović,

Vrana,

Frka

et al. 2023

Limnology & Oceanography

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Marine 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.

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Section: Discussionmentioning

confidence: 99%