Phytoplankton community responses to temperature fluctuations under different nutrient concentrations and stoichiometry

  • Nutrient availability and temperature are important drivers of phytoplankton growth and stoichiometry. However, the interactive effects of nutrients and temperature on phytoplankton have been analyzed mostly by addressing changes in average temperature, whereas recent evidence suggests an important role of temperature fluctuations. In a laboratory experiment, we grew a natural phytoplankton community under fluctuating and constant temperature regimes across 25 combinations of nitrogen (N) and phosphorus (P) supply. Temperature fluctuations decreased phytoplankton growth rate (r(max)), as predicted by nonlinear averaging along the temperature-growth relationship. r(max) increased with increasing P supply, and a significant temperature x P x N interaction reflected that the shape of the thermal reaction norm depended on nutrients. By contrast, phytoplankton carrying capacity increased with N supply and in fluctuating rather than constant temperature. Higher phytoplankton N:P ratios under constant temperature showed that temperatureNutrient availability and temperature are important drivers of phytoplankton growth and stoichiometry. However, the interactive effects of nutrients and temperature on phytoplankton have been analyzed mostly by addressing changes in average temperature, whereas recent evidence suggests an important role of temperature fluctuations. In a laboratory experiment, we grew a natural phytoplankton community under fluctuating and constant temperature regimes across 25 combinations of nitrogen (N) and phosphorus (P) supply. Temperature fluctuations decreased phytoplankton growth rate (r(max)), as predicted by nonlinear averaging along the temperature-growth relationship. r(max) increased with increasing P supply, and a significant temperature x P x N interaction reflected that the shape of the thermal reaction norm depended on nutrients. By contrast, phytoplankton carrying capacity increased with N supply and in fluctuating rather than constant temperature. Higher phytoplankton N:P ratios under constant temperature showed that temperature regimes affected cellular nutrient incorporation. Minor differences in species diversity and composition existed. Our results suggest that temperature variability interacts with nutrient supply to affect phytoplankton physiology and stoichiometry at the community level.show moreshow less

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Metadaten
Author:Miriam GerhardORCiD, Apostolos Manuel KoussoroplisORCiDGND, Helmut HillebrandORCiDGND, Maren StriebelORCiDGND
DOI:https://doi.org/10.1002/ecy.2834
ISSN:0012-9658
ISSN:1939-9170
Pubmed Id:http://www.ncbi.nlm.nih.gov/pubmed?term=31330048
Parent Title (English):Ecology : a publication of the Ecological Society of America
Publisher:Wiley
Place of publication:Hoboken
Document Type:Article
Language:English
Date of first Publication:2019/08/03
Year of Completion:2019
Release Date:2020/11/20
Tag:N; P ratios; carrying capacity; growth rate; phytoplankton composition; temperature variability; thermal performance
Volume:100
Issue:11
Page Number:11
Funder:Uruguayan Agency of Investigation and Innovation (ANII); German Academic Exchange Service (DAAD)Deutscher Akademischer Austausch Dienst (DAAD); German Research Foundation (DFG)German Research Foundation (DFG) [STR 1383/1-1, STR 1383/6-1, HI 848/15-1, HI 848/24-1, SPP 1704, KO5330/1-1]
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Biochemie und Biologie
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 57 Biowissenschaften; Biologie / 570 Biowissenschaften; Biologie
Peer Review:Referiert
Publication Way:Open Access
Open Access / Green Open-Access