Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1002/ecy.2875
Lizenz creative commons licence
Titel (primär) Temperature and stoichiometric dependence of phytoplankton traits
Autor Hofmann, P.; Chatzinotas, A.; Harpole, W.S. ORCID logo ; Dunker, S.
Quelle Ecology
Erscheinungsjahr 2019
Department UMB; iDiv; PHYDIV
Band/Volume 100
Heft 12
Seite von e02875
Sprache englisch
Keywords acclimation; cyanobacteria; fixed traits; green algae; intraspecific trait variation; microcosms; nutrients; trait environment relationships; trait shifts; variability
Abstract Understanding the links between intraspecific trait variability and environmental gradients is an important step toward unravelling the mechanisms that link species performance to environmental variation. Here, we performed a comparative, experimental study to investigate variability of cellular traits in three prokaryotic and three eukaryotic freshwater phytoplankton species along gradients of temperature and nitrogen:phosphorus ratio (N:P) in laboratory microcosms. Temperature and N:P strongly affect phytoplankton growth and are changing due to climate change and eutrophication. Metabolic theory and allometric scaling predict that smaller organisms should be favored at higher temperatures through improved metabolic uptake partly due to greater surface area to volume ratios. In addition, chlorophyll a (chl a) concentration should increase due to higher chlorophyll synthesis in response to light limitation at higher cell densities. We found that cell volume both increased and decreased with temperature, whereas intermediate N:P yielded higher growth rates and more extreme conditions yielded bigger cell volumes. Species growth responses to these gradients were distinct and not related to phylogenetic differences. Meaningfully coupled traits like the chl a fluorescence and cell volume shifted consistently and can improve our understanding of individual cell responses to abiotic drivers. This study showed that intraspecific trait variability of freshwater phytoplankton harbors potential for short term acclimation to environmental gradients. Finally, the high trait variability in some species has strong implications for their ecology and the accuracy of predictions where responses may differ when based on mean or fixed trait values.
dauerhafte UFZ-Verlinkung
Hofmann, P., Chatzinotas, A., Harpole, W.S., Dunker, S. (2019):
Temperature and stoichiometric dependence of phytoplankton traits
Ecology 100 (12), e02875 10.1002/ecy.2875