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Zooplankton use of terrestrial organic matter in boreal aquatic food webs

Grosbois Guillaume. (2017). Zooplankton use of terrestrial organic matter in boreal aquatic food webs. Thèse de doctorat, Université du Québec à Chicoutimi.

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Résumé

This thesis is structured in 3 chapters, the 1st chapter explores the link between crustacean zooplankton biomass from terrestrial origin (i.e. allochthony) using stable isotopes and the production of crustacean zooplankton community. This chapter is the result of a collaborative work between my supervisor Dr. Milla Rautio, my co-supervisor Dr. Paul del Giorgio, his PhD student Dr. Dominic Vachon and I. DV provided the gross primary production and river flow data. I carried out the sampling, data and statistical analysis as well as zooplankton identification and production calculations. I wrote the article together with MR while DV revised the final version. PdG will provide comments before submitting the paper to a journal. The second chapter uses fatty acid analyses, a complementary method to stable isotopes to study lipid reserves of the same zooplankton community. It allows a better understanding of how life history strategies influence the building of lipid reserves and how different food sources (phytoplankton, terrestrial organic matter, bacteria) are used in zooplankton life cycle and winter survival. This study has been possible thanks to the collaborative effort of Dr. M. Rautio and her post-doc fellow Dr. Heather Mariash who carried out the survival experiment, as well as MR’s PhD student Dr. Tobias Schneider who provided some of the seston fatty acid data. I designed the study with my supervisor’s help, carried out the sampling, lab work, data and statistical analysis. I wrote the manuscript with MR. All authors participated to the manuscript revision that is now submitted to Scientific Reports (February 2017). The third chapter looked at the spatial distribution of the allochthony in the most abundant copepod, Leptodiaptomus minutus in Lake Simoncouche and explained it ecologically with the carbon source distribution. This chapter has been published in Freshwater Biology (March 2017) thanks to the collaboration of Dr. M Rautio, Dr. P. del Giorgio and I. I designed the study, carried out the sampling, data, lab work and statistical analysis. I wrote this manuscript together with MR and PdG.

Type de document:Thèse ou mémoire de l'UQAC (Thèse de doctorat)
Date:Mars 2017
Lieu de publication:Chicoutimi
Programme d'étude:Doctorat en biologie
Nombre de pages:182
ISBN:Non spécifié
Sujets:Sciences naturelles et génie > Sciences naturelles > Biologie et autres sciences connexes
Département, module, service et unité de recherche:Départements et modules > Département des sciences fondamentales > Programmes d'études de cycles supérieurs en ressources renouvelables, environnement et biologie
Directeur(s), Co-directeur(s) et responsable(s):Rautio, Milla
del Giorgio, Paul A.
Mots-clés:allochthony, fatty acid, macrophytes, stable isotope, winter, allochtonie, acides gras, isotopes stables, macrophytes, hiver
Déposé le:13 juin 2017 10:42
Dernière modification:14 juin 2017 13:43
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