Composition of natural phytoplankton community has minor effects on autochthonous dissolved organic matter characteristics

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http://hdl.handle.net/10138/319174

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Haraguchi , L , Asmala , E , Jakobsen , H H & Carstensen , J 2019 , ' Composition of natural phytoplankton community has minor effects on autochthonous dissolved organic matter characteristics ' , Marine Biology Research , vol. 15 , no. 4-6 , pp. 357-375 . https://doi.org/10.1080/17451000.2019.1662449

Title: Composition of natural phytoplankton community has minor effects on autochthonous dissolved organic matter characteristics
Author: Haraguchi, Lumi; Asmala, Eero; Jakobsen, Hans H.; Carstensen, Jacob
Contributor organization: Ecosystems and Environment Research Programme
Marine Ecosystems Research Group
Tvärminne Zoological Station
Aquatic Biogeochemistry Research Unit (ABRU)
Date: 2019-07-03
Language: eng
Number of pages: 19
Belongs to series: Marine Biology Research
ISSN: 1745-1000
DOI: https://doi.org/10.1080/17451000.2019.1662449
URI: http://hdl.handle.net/10138/319174
Abstract: Dissolved organic matter (DOM) is an important component of nutrient cycling, but the role of different organisms controlling the processing of autochthonous DOM remains poorly understood. Aiming to characterize phytoplankton-derived DOM and the effects of complex pelagic communities on its dynamics, we incubated natural plankton communities from a temperate mesohaline estuary under controlled conditions for 18 days. The incubations were carried out in contrasting seasons (spring and autumn) and changes in the planktonic community (phytoplankton, bacteria and microzooplankton), nutrients and DOM were assessed. Our results highlight the complexity of DOM production and fate in natural planktonic communities. Small changes in DOM composition were observed in the experiments relative to the orders-of-magnitude variations experienced in the phytoplankton assembly. We argue that the tight coupling between microbial processing and DOM production by phytoplankton and grazers stabilizes variations in quantity and characteristics of autochthonous DOM, resulting in apparently homogeneous semi-labile DOM pool throughout the experiments. However, seasonal differences in the production and processing of DOM were observed, reflecting differences in the nutrient regimes and initial DOM characteristics in each experiment, but also likely influenced by changes in the successional status of the pelagic community. Acknowledging that characteristics of the DOM derived from phytoplankton growth can vary broadly, heterotrophic processing and successional status of the community are synergistically important factors for shaping those characteristics, and thus affecting the seasonal signature of the semi-labile autochthonous DOM pool.
Subject: Pelagic food web
succession
autochthonous DOM
AMINO-ACIDS
CARBON
MARINE
FLUORESCENCE
RELEASE
DOM
ENVIRONMENTS
DYNAMICS
CONSUMPTION
METABOLISM
1181 Ecology, evolutionary biology
1172 Environmental sciences
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: acceptedVersion


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