Publications Scientifiques

[ Article ] About the interest of a zooplankton compartment in pond systems: methodology to study the growth kinetic of Daphnia pulex on Scenedesmus sp.

Date de soumission: 08-03-2018
Année de Publication: 2015
Entité/Laboratoire Laboratoire de Recherche sur les Zones Humides (LRZH)
Document type : Article
Discipline(s) : Sciences Environnement &Ecologie
Titre About the interest of a zooplankton compartment in pond systems: methodology to study the growth kinetic of Daphnia pulex on Scenedesmus sp.
Auteurs LIADY MOUHAMADOU NOUROU DINE [1], TANGOU THIERRY TABOU [2], FIOGBE EMILE DIDIER [3], HENRY MICHEL CAUCHIE [4], VASEL Jean-Luc [5],
Journal: Water Science & Technology
Catégorie Journal:
Impact factor: 1.212
Volume Journal: 71
DOI: 10.2166/wst.2015.107
Resume A reliable characterization of cladocerans’ growth kinetic on their substrates is crucial for the estimation of their biochemical conversion rate in pond models. Although many studies reported cladocerans’ growth inhibitions by high chlorophyceae contents, their growth kinetics had continued to be described in many pond system models by Monod-type kinetic, which describes growth saturation by high substrate contents, but fails to explain the disappearance of cladocerans observed during chlorophyceae’s bloom periods. This study aimed to develop a methodology and assess whether growth-inhibition-type models used to describe microbial growth kinetics can be applicable to cladocerans. Experiments were carried out using Daphnia pulex populations and Scenedesmus sp. First, biomass of D. pulex was measured through digital image processing (DIP) during growth experiments. Then, three candidate models (i.e., Andrews, Edward and Haldane models), along with the Monod model, were fitted to the observed data and compared. The results showed that the DIP technique provided reliable results for estimating the biomass of D. pulex. Our findings show that the candidate growth inhibition-type models satisfactorily described D. pulex’s growth kinetic (86% variance accounted for). Scenesdemus sp. were not strong inhibitors of the growth of D. pulex (high inhibition constant and low half-saturation constant found).
Mots clés cladocerans, growth-kinetic, image processing, modeling, pond
Pages 1436 - 1440
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