Data/hora: 13/06/2024 04:15:02

Provedor de dados: | Institutional Archive of Ifreme (ArchiMer)
País: | France
Título: | Response of Mytilus edulis to enhanced phytoplankton availability by controlled upwelling in an oligotrophic fjord
Autores: | Strohmeier, Tore; Strand, Oivind; Alunno-bruscia, Marianne; Duinker, Arne; Rosland, Rune; Aure, Jan; Erga, Svein R.; Naustvoll, Lars J.; Jansen, Henrice M.; Cranford, Peter J.
Data: | 2015-01
Ano: | 2015
Palavras-chave: | Bivalve aquaculture; Production carrying capacity; Physiology; Fjord ecosystems; Shell growth; Tissue growth.
Resumo: | The controlled upwelling of nutrient-rich deep water in oligotrophic coastal regions has been proposed as a means of increasing phytoplankton and, subsequently, bivalve aquaculture production. This was tested as part of a large-scale upwelling experiment in an oligotrophic environment (Lysefjord, Norway). The mean chlorophyll a concentration in the upwelling area was consistently higher than at the control site (mean ± SD: 3.3 ± 1.9 and 1.5 ± 0.6 mg Chl a m-3, respectively) during the 4 mo of controlled upwelling. After 2 mo with upwelling, the dry flesh weight of 1 yr-old and 2 yr-old mussels was 95% and 24% higher, respectively, than that of the mussels at the control site. The 1 yr-old mussels at the upwelling site achieved up to 2.4-fold higher dry flesh weight compared to the control. Reproductive output was also higher at the upwelling site and only there, spawning of 1 yr-old mussels was detected. Standardized clearance and respiration rates showed maximum values during the most intense period of tissue growth. Average ingestion rates were 40% higher at the upwelling than the control site. Tissue growth and clearance rates were not correlated with the measured seston parameters, suggesting that food acquisition was responsive to other exogenous parameters and/or to increased endogenous energy demands. It was concluded that the sustained upwelling of nutrient-rich deep water in an oligotrophic fjord can increase phytoplankton biomass, resulting in improved mussel growth performance and increased aquaculture production carrying capacity. Thus, controlled upwelling represents a simple but effective ecosystem engineering approach for enhancing human food production.
Tipo: | Text
Idioma: | Inglês

Identificador:

https://archimer.ifremer.fr/doc/00241/35200/33704.pdf

https://archimer.ifremer.fr/doc/00241/35200/34266.pdf

DOI:10.3354/meps11036

https://archimer.ifremer.fr/doc/00241/35200/

Editor: | Inter-research
Formato: | application/pdf
Fonte: | Marine Ecology Progress Series (0171-8630) (Inter-research), 2015-01 , Vol. 518 , P. 139-152

Fonte:

Inter-Research 2015

info:eu-repo/semantics/openAccess

restricted use