Krill diel vertical migration in Southern Patagonia
| Type | : | ACL |
|---|---|---|
| Nature | : | Production scientifique |
| Au bénéfice du Laboratoire | : | Non |
| Statut de publication | : | Publié |
| Année de publication | : | 2021 |
| Auteurs (5) | : | NOCERA Ariadna GIMENEZ E,m DIEZ M,j RETANA M,v WINKLER G |
| Revue scientifique | : | Journal of Plankton Research |
| Volume | : | 43 |
| Fascicule | : | 4 |
| Pages | : | 610-623 |
| DOI | : | 10.1093/plankt/fbab047 |
| URL | : | - |
| Abstract | : | Diel vertical migration (DVM) of krill was studied throughout 36 h at a fixed station (46.05 degrees S, 66.19 degrees W; 98-m depth) located in the center of the San Jorge Gulf, Southern Patagonia area, during February 2014. Using an echosounder system, combined with an autonomous Video Plankton Recorder (Auto-VPR) and Jacknet samplings, we describe the migration pattern, the associated biomass and the macrozooplankton species involved. The net sampling and the Auto-VPR images allowed us to identify the krill species detected in the echosounder signals, which corresponded to Euphausia lucens, Euphausia vallentini and Nematoscelis megalops. The krill community followed a "normal pattern" of DVM, ascending at dusk (similar to 18:30 h) and descending at dawn (similar to 06:30 h), forming a dense layer near the bottom during the day. Krill vertical migration speed was estimated from the echogram data at similar to 1 cm s(-1) (1 body length per s for 1-cm-long animal), and the integrated mean biomass was 57.8 g m(-2). This study provides a description of temporal and spatial patterns of krill vertical distribution, which should be taken into account when studying the complexity of the SJG ecosystem dynamics and carbon flux. |
| Mots-clés | : | - |
| Commentaire | : | - |
| Tags | : | - |
| Fichier attaché | : | - |
| Citation | : |
Nocera A, Gimenez EM, Diez MJ, Retana MV, Winkler G (2021) Krill diel vertical migration in Southern Patagonia. J Plankton Res 43: 610-623 | doi: 10.1093/plankt/fbab047
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