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Lake warming favours small-sized planktonic diatom species

Diatoms contribute to a substantial portion of primary production in the oceans and many lakes. Owing to their relatively heavy cell walls and high nutrient requirements, planktonic diatoms are expected to decrease with climate warming because of reduced nutrient redistribution and increasing sinkin...

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Autores principales: Winder, Monika, Reuter, John E., Schladow, S. Geoffrey
Formato: Texto
Lenguaje:English
Publicado: The Royal Society 2008
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2581674/
https://www.ncbi.nlm.nih.gov/pubmed/18812287
http://dx.doi.org/10.1098/rspb.2008.1200
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author Winder, Monika
Reuter, John E.
Schladow, S. Geoffrey
author_facet Winder, Monika
Reuter, John E.
Schladow, S. Geoffrey
author_sort Winder, Monika
collection PubMed
description Diatoms contribute to a substantial portion of primary production in the oceans and many lakes. Owing to their relatively heavy cell walls and high nutrient requirements, planktonic diatoms are expected to decrease with climate warming because of reduced nutrient redistribution and increasing sinking velocities. Using a historical dataset, this study shows that diatoms were able to maintain their biovolume with increasing stratification in Lake Tahoe over the last decades; however, the diatom community structure changed. Increased stratification and reduced nitrogen to phosphorus ratios selected for small-celled diatoms, particularly within the Cyclotella genus. An empirical model showed that a shift in phytoplankton species composition and cell size was consistent within different depth strata, indicating that altered nutrient concentrations were not responsible for the change. The increase in small-celled species was sufficient to decrease the average diatom size and thus sinking velocity, which strongly influences energy transfer through the food web and carbon cycling. Our results show that within the diverse group of diatoms, small-sized species with a high surface area to volume ratio were able to adapt to a decrease in mixing intensity, supporting the hypotheses that abiotic drivers affect the size structure of planktonic communities and that warmer climate favours small-sized diatom cells.
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spelling pubmed-25816742009-04-13 Lake warming favours small-sized planktonic diatom species Winder, Monika Reuter, John E. Schladow, S. Geoffrey Proc Biol Sci Research Article Diatoms contribute to a substantial portion of primary production in the oceans and many lakes. Owing to their relatively heavy cell walls and high nutrient requirements, planktonic diatoms are expected to decrease with climate warming because of reduced nutrient redistribution and increasing sinking velocities. Using a historical dataset, this study shows that diatoms were able to maintain their biovolume with increasing stratification in Lake Tahoe over the last decades; however, the diatom community structure changed. Increased stratification and reduced nitrogen to phosphorus ratios selected for small-celled diatoms, particularly within the Cyclotella genus. An empirical model showed that a shift in phytoplankton species composition and cell size was consistent within different depth strata, indicating that altered nutrient concentrations were not responsible for the change. The increase in small-celled species was sufficient to decrease the average diatom size and thus sinking velocity, which strongly influences energy transfer through the food web and carbon cycling. Our results show that within the diverse group of diatoms, small-sized species with a high surface area to volume ratio were able to adapt to a decrease in mixing intensity, supporting the hypotheses that abiotic drivers affect the size structure of planktonic communities and that warmer climate favours small-sized diatom cells. The Royal Society 2008-09-23 2009-02-07 /pmc/articles/PMC2581674/ /pubmed/18812287 http://dx.doi.org/10.1098/rspb.2008.1200 Text en Copyright © 2008 The Royal Society http://creativecommons.org/licenses/by/2.5/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Article
Winder, Monika
Reuter, John E.
Schladow, S. Geoffrey
Lake warming favours small-sized planktonic diatom species
title Lake warming favours small-sized planktonic diatom species
title_full Lake warming favours small-sized planktonic diatom species
title_fullStr Lake warming favours small-sized planktonic diatom species
title_full_unstemmed Lake warming favours small-sized planktonic diatom species
title_short Lake warming favours small-sized planktonic diatom species
title_sort lake warming favours small-sized planktonic diatom species
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2581674/
https://www.ncbi.nlm.nih.gov/pubmed/18812287
http://dx.doi.org/10.1098/rspb.2008.1200
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