Publications des scientifiques de l'IRD

Lezama-Ochoa A., Irigoien X., Chaigneau Alexis, Quiroz Z., Lebourges Dhaussy Anne, Bertrand Arnaud. (2014). Acoustic reveal the presence of Macrozooplankton biocline in the Bay of Biscay in response to hydrological conditions and predator-prey relationships. PLoS One, 9 (2), e88054 [12 p. en ligne]. ISSN 1932-6203.

Titre du document
Acoustic reveal the presence of Macrozooplankton biocline in the Bay of Biscay in response to hydrological conditions and predator-prey relationships
Année de publication
2014
Type de document
Article référencé dans le Web of Science WOS:000336971300045
Auteurs
Lezama-Ochoa A., Irigoien X., Chaigneau Alexis, Quiroz Z., Lebourges Dhaussy Anne, Bertrand Arnaud
Source
PLoS One, 2014, 9 (2), e88054 [12 p. en ligne] ISSN 1932-6203
Bifrequency acoustic data, hydrological measurements and satellite data were used to study the vertical distribution of macrozooplankton in the Bay of Biscay in relation to the hydrological conditions and fish distribution during spring 2009. The most noticeable result was the observation of a ‘biocline’ during the day i.e., the interface where zooplankton biomass changes more rapidly with depth than it does in the layers above or below. The biocline separated the surface layer, almost devoid of macrozooplankton, from the macrozooplankton-rich deeper layers. It is a specific vertical feature which ties in with the classic diel vertical migration pattern. Spatiotemporal correlations between macrozooplankton and environmental variables (photic depth, thermohaline vertical structure, stratification index and chlorophyll-a) indicate that no single factor explains the macrozooplankton vertical distribution. Rather a set of factors, the respective influence of which varies from region to region depending on the habitat characteristics and the progress of the spring stratification, jointly influence the distribution. In this context, the macrozooplankton biocline is potentially a biophysical response to the search for a particular depth range where light attenuation, thermohaline vertical structure and stratification conditions together provide a suitable alternative to the need for expending energy in reaching deeper water without the risk of being eaten.
Plan de classement
Biologie animale : invertébrés / Systématique [034BIOINV] ; Océanographie [126TELAPP05]
Descripteurs
ZOOPLANCTON ; REPARTITION VERTICALE ; PROSPECTION ACOUSTIQUE ; TELEDETECTION SPATIALE ; VARIATION JOURNALIERE ; THERMOHALINE ; PRODUCTION PRIMAIRE ; CHLOROPHYLLE ; COUCHE EUPHOTIQUE ; PREDATEUR
Description Géographique
ATLANTIQUE ; FRANCE ; ESPAGNE
Localisation
Fonds IRD [F B010062163]
Identifiant IRD
fdi:010062163
Contact