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Food-web structure and functioning of temperate and tropical lakes: A stoichiometric viewpoint

Published online by Cambridge University Press:  03 April 2009

Michael Danger ,
Gérard Lacroix ,
Samba Kâ ,
El Hadji Ndour ,
Daniel Corbin  and
Xavier Lazzaro
Michael Danger*
Affiliation:
UMR CNRS 8079 - ESE, Laboratoire de Systématique, Écologie et Évolution, Université Paris Sud XI, Bât. 362, 91405 Orsay, France Current address: Laboratoire d'Écologie Fonctionnelle, Ecolab UMR 5245, CNRS, 29 rue Jeanne Marvig, 31055 Toulouse, France
Gérard Lacroix
Affiliation:
Laboratoire Bioemco, UMR 7618 (Université Paris 6, CNRS, INRA, ENS), École Normale Supérieure, 46 rue d'Ulm, 75230 Paris Cedex 05, France
Samba Kâ
Affiliation:
IRD, UR167-CYROCO, Campus mixte ISRA-IRD Bel-Air, BP 1386, CP 18524, Dakar, Senegal
El Hadji Ndour
Affiliation:
IRD, UR167-CYROCO, Campus mixte ISRA-IRD Bel-Air, BP 1386, CP 18524, Dakar, Senegal
Daniel Corbin
Affiliation:
IRD, UR167-CYROCO, Campus mixte ISRA-IRD Bel-Air, BP 1386, CP 18524, Dakar, Senegal
Xavier Lazzaro
Affiliation:
IRD, UR167-CYROCO, Campus mixte ISRA-IRD Bel-Air, BP 1386, CP 18524, Dakar, Senegal Current address: UR 131-AMAZONE, UMR 5178-BOEA-USM 0401, CP 53, 61 rue Buffon, 75231 Paris Cedex 5, France
*
[email protected] [email protected] [email protected] [email protected] [email protected]
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Abstract

Difficulties to simply transfer trophic cascade theory from temperate to tropical lakes are now well recognized. Many mechanisms trying to explain top-down divergences between these systems have been proposed, such as lack of key species of herbivorous zooplankton, absence of seasonality in fish reproduction, cyanobacteria development, or differences in fish foraging behaviour. Very few studies have considered bottom-up mechanisms, in particular differences in nutrient recycling and nutrient limitation between the two types of ecosystems. According to the ecological stoichiometry theory, fish-induced alterations of food-web structure could modify the efficiency of consumer-driven nutrient recycling by changing the relative biomass contribution of species in food webs. Consequently, by mostly considering top-down processes, one could underestimate consequences on nutrient availability for phytoplankton growth. In this paper, we compared the results of two mesocosm experiments carried out in temperate and tropical areas, each manipulating food-web structure via the presence or absence of fish. We found trophic cascades in both experiments, but differences between fishless and fish treatments were greater in temperate than in tropical systems. In the tropical experiment, the observed effects could not be supported by classical zooplankton community alteration or by cyanobacteria prevalence. Our results suggest a key contribution of fish nitrogen-excretion to phytoplankton growth in mostly nitrogen-limited tropical systems. Differences in stoichiometric response to food-web structure alteration between temperate and tropical lakes could thus represent a major difference between the two systems. Our study stresses the need for further studies that would allow robust generalization on the functioning of freshwater temperate and tropical ecosystems.

Keywords

Ecological stoichiometrytropical vs. temperatetrophic cascadesnutrient recyclingomnivory
Type
Research Article
Information
Annales de Limnologie - International Journal of Limnology , Volume 45 , Issue 1 , 2009 , pp. 11 - 21
Copyright
© EDP Sciences, 2009

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