Drivers of phytoplankton production and community structure in nutrient-poor estuaries receiving terrestrial organic inflow.

Abstract:

:The influence of nutrient availability and light conditions on phytoplankton size-structure, nutritional strategy and production was studied in a phosphorus-poor estuary in the northern Baltic Sea receiving humic-rich river water. The relative biomass of mixotrophic nanophytoplankton peaked in spring when heterotrophic bacterial production was high, while autotrophic microphytoplankton had their maximum in summer when primary production displayed highest values. Limiting substance (phosphorus) only showed small temporal variations, and the day light was at saturating levels all through the study period. We also investigated if the phytoplankton taxonomic richness influences the production. Structural equation modelling indicated that an increase of the taxonomic richness during the warm summer combined with slightly higher phosphorus concentration lead to increased resource use efficiency, which in turn caused higher phytoplankton biomass and primary production. Our results suggest that climate warming would lead to higher primary production in northerly shallow coastal areas, which are influenced by humic-rich river run-off from un-disturbed terrestrial systems.

journal_name

Mar Environ Res

authors

Paczkowska J,Rowe OF,Figueroa D,Andersson A

doi

10.1016/j.marenvres.2019.104778

subject

Has Abstract

pub_date

2019-10-01 00:00:00

pages

104778

eissn

0141-1136

issn

1879-0291

pii

S0141-1136(19)30213-2

journal_volume

151

pub_type

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