Publications des scientifiques de l'IRD

Lemonnier H., Hochard S., Nakagawa K., Courties C., Rodier Martine. (2018). Response of phytoplankton to organic enrichment and shrimp activity in tropical aquaculture ponds : a mesocosm study. Aquatic Microbial Ecology, 80 (2), p. 105-122. ISSN 0948-3055.

Titre du document
Response of phytoplankton to organic enrichment and shrimp activity in tropical aquaculture ponds : a mesocosm study
Année de publication
2018
Type de document
Article référencé dans le Web of Science WOS:000414556700001
Auteurs
Lemonnier H., Hochard S., Nakagawa K., Courties C., Rodier Martine
Source
Aquatic Microbial Ecology, 2018, 80 (2), p. 105-122 ISSN 0948-3055
We conducted a mesocosm study to investigate the combined effect of organic enrichment and sediment resuspension by shrimp on phytoplankton communities in shrimp aquaculture ponds. Hence, the factorial design included 2 factors: (1) shrimp density with a concomitant increase of feed input, resulting in organic enrichment, and (2) access of shrimp to the sediments. Increasing feed input in the system raised the eutrophication state of the environment, characterized by an increase in phytoplankton biomass. Bioturbation enhanced: (1) mineralization of organic matter via the microbial loop, resulting in faster nutrient recycling, (2) primary production and (3) buffering capacity against eutrophication consequences. The phytoplankton community showed both large temporal variations of its taxonomic composition and resilience to treatments. A shift in species dominance from diatoms + dinoflagellates to green algae was observed in all treatments and coincided with meteorological and N pool changes. Results suggest that algal production was primarily limited by phosphorus and light at low (i.e. low feeding) and high (i.e. high feeding) eutrophication states, respectively. Growth rate of species to be a major factor favoring their dominance in the phytoplankton community in this highly dynamic ecosystem. Consequences for water column management are discussed.
Plan de classement
Ecologie, systèmes aquatiques [036] ; Ressources halieutiques [040]
Description Géographique
NOUVELLE CALEDONIE ; PACIFIQUE
Localisation
Fonds IRD [F B010071371]
Identifiant IRD
fdi:010071371
Contact