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Response of Cyclotella species to nutrients and incubation depth in Arctic lakes

journal contribution
posted on 30.04.2015, 15:30 by Jasmine E. Saros, Kristin E. Strock, Joan McCue, Erika Whiteford, Nicholas John Anderson
The relative abundances of small centric diatoms have increased in many Arctic lakes over the past century, with these changes commonly attributed to warming. However, the specific mechanisms by which diatom community structure is changing in response to warming remain unclear. We investigated the responses of two common centric diatoms to nutrient enrichment and incubation depth, the latter used to manipulate light availability which is a key factor that changes with altered mixing depths in lakes. We conducted 2 × 2 factorial experiments, manipulating nutrients (none added or N + P addition) and incubation depth (shallow or deep), and measured changes in growth rates and cell densities of Discostella stelligera and Puncticulata radiosa. A second set of experiments was conducted on D. stelligera in a growth chamber to separate temperature and light effects associated with incubation depth. Puncticulata radiosa was always more abundant in the shallow depth incubations, regardless of nutrient conditions. In contrast, D. stelligera responded most strongly to nutrient additions, and cell densities of this species were affected by interactions between nutrients and incubation depth or light. Our research suggests that processes that alter light availability (such as water clarity and water column stability) and nutrient concentrations are likely to play a major role in controlling the growth of small centric diatoms in Arctic lakes.

Funding

Funding for this research was provided by the Climate Change Institute at the University of Maine, the Gokcen Fund, the Dan & Betty Churchill Fund and the UK Natural Environment Research Council.

History

School

  • Social Sciences

Department

  • Geography and Environment

Published in

Journal of Plankton Research

Volume

36

Issue

2

Pages

450 - 460 (10)

Citation

SAROS, J.E. ... et al, 2014. Response of Cyclotella species to nutrients and incubation depth in Arctic lakes. Journal of Plankton Research, 36 (2), pp. 450 - 460.

Publisher

Oxford University Press / © The Authors

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2014

Notes

This article is closed access.

ISSN

0142-7873

Language

en

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