La estructura del ecosistema pelágico en relación con las condiciones oceanográficas y topográficas en el golfo de Cádiz, estrecho de Gibraltar y mar de Alborán (sector noroeste), en julio de 1995
- Rubín, J.P.
- Cano, N.
- Prieto, L.
- García, C.M.
- Ruiz J.
- Echevarría, F.
- Corzo, A.
- Gálvez, J.A.
- Lozano, F.
- Alonso-Santos, J.C.
- Escánez, J.
- Juárez, A.
ISSN: 0212-1565
Year of publication: 1999
Issue: 175
Pages: 3-73
Type: Article
More publications in: Informes técnicos ( Instituto Español de Oceanografía )
Abstract
The results obtained from 59 stations sampled in the Gulf of Cadiz, Straits of Gibraltar and Alborán Sea (northwest sector) during July 1995 are analysed in this paper. The main hydrological characteristics recorded during the survey and their possible relationship with planktonic distribution and composition are presented. The eggs and larvae of anchovy Engraulis encrasicolus (L., 1758) and gilt sardine Sardinella aurita Valenciennes, 1847 (typically coastal) were the most abundant in the Gulf of Cadiz, where warmer, fresher and shallower waters are dominant. However, the Maurolicus muelleri (Gmelin, 1788) plankton components (oceanic) predominated in the Alborán Sea, characterised by a narrow continental shelf and active upwelling. The different topographic and hydrographic features of these geographic zones were also apparent in the complementary analyses that were carried out: Atlantic waters were characterised by lower concentration values of nitrate reductase activity, particulate matter, chlorophyll-a and phaeopigments, and higher values of phosphate concentrations and small planktonic organisms (bacterioplankton, autotrophic picoplankton, flagellates, ciliates, cladocerans and copepods).