Carbon steady-state model of the planktonic food web of Lake Biwa, Japan

Nathalie Niquil (1) , Gretta Bartoli (2) , Jotaro Urabe (3) , George A. Jackson (4) , Louis Legendre (5) , Christine Dupuy (6) , D. M. Kumagai (7)

1 UNICAEN - Université de Caen Normandie
2 CAU - Christian-Albrechts-Universität zu Kiel = Christian-Albrechts University of Kiel = Université Christian-Albrechts de Kiel
3 Tohoku University [Sendai]
4 Texas State Universite
5 OOVM - Observatoire océanologique de Villefranche-sur-mer
6 LIENSs - LIttoral ENvironnement et Sociétés
7 Lake Biwa Environmental Research Institute

SUMMARY 1. A steady-state model of carbon flows was developed to describe the summer planktonic food web in the surface mixed-layer of the North Basin in Lake Biwa, Japan. This model synthesised results from numerous studies on the plankton of Lake Biwa. 2. An inverse analysis procedure was used to estimate missing flow values in a manner consistent with known information. Network analysis was applied to characterise emergent properties of the resulting food web. 3. The system strongly relied on flows related to detrital particles. Whereas primary production was mainly by phytoplankton >20 lm, microzooplankton were active and mainly ingested detritus and bacteria. 4. The main emergent property of the system was strong recycling, through either direct ingestion of non-living material by zooplankton, or ingestion of bacteria after degradation of detritus to release dissolved organic carbon.

Mots clés: static model; lake; plankton; detritus; food web

Domaines: Sciences du Vivant [q-bio]

Nathalie Niquil, Gretta Bartoli, Jotaro Urabe, George A. Jackson, Louis Legendre, et al.. Carbon steady-state model of the planktonic food web of Lake Biwa, Japan. Freshwater Biology, 2006, ⟨10.1111/j.1365-2427.2006.01595.x⟩. ⟨hal-01248033⟩