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Bioturbation functional roles associated with mangrove development in French Guiana, South America

Aschenbroich, Adélaïde and Michaud, Emma and Gilbert, Franck and Fromard, François and Alt, Arthur and Le Garrec, Vincent and Bihannic, Isabelle and De Coninck, Arnaud and Thouzeau, Gérard Bioturbation functional roles associated with mangrove development in French Guiana, South America. (2017) Hydrobiologia: The International Journal of Aquatic Sciences. 1-24. ISSN 0018-8158

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Official URL: http://dx.doi.org/10.1007/s10750-017-3093-7

Abstract

This study aims to qualify, quantify, and compare the sediment reworking rates induced by the meso- (0.25–1 mm) and macro-infauna ([1 mm) along a mangrove growth gradient in the sedimentary dynamics of the French Guiana coast. The characterization of the role of small-infauna bioturbation in mangroves is new despite their known numerical dominance in tropical environments. Bare sediment, pioneer mangroves, and young mangroves were investigated during the dry season and spring tide to characterize their environment, infaunal functional community structure and sediment reworking rates. The biodiffusion differed significantly between mangrove stages, co-varying mainly with density and functional richness. On the contrary, the non-local transport remained similar, despite the mangrove-agespecificity of infauna functional compositions, which responded to modifications in the nature and content of organic matter. The first mangrove infaunal functional sequence is described: organisms that first colonize deposited mud generate the maximum biodiffusive mixing and induce a total downward particle flux (BDF) as high as in the young mangroves; in the pioneer mangroves, the infauna variables and BDF are stressed to minimum values. Our study sheds light on the functional contribution of the small infauna in a mangrove coastal area and quantifies its role in particle transport during mangrove development.

Item Type:Article
Additional Information:Thanks to Springer Verlag editor. The definitive version is available at https://link.springer.com/article/10.1007%2Fs10750-017-3093-7
HAL Id:hal-01495030
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
French research institutions > Institut Français de Recherche pour l'Exploitation de la MER - IFREMER (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Other partners > Institut National de la Recherche Scientifique - INRS (CANADA)
French research institutions > Institut de Recherche pour le Développement - IRD (FRANCE)
Other partners > Université de Bretagne Occidentale - UBO (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Université de Lorraine (FRANCE)
Laboratory name:
Funders:
ANR - EC2CO
Statistics:download
Deposited By: Franck Gilbert
Deposited On:20 Mar 2017 10:31

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