TY - JOUR
T1 - Spatial and temporal distribution of mesozooplankton in the Gulf of Aqaba and the northern Red Sea in February/March 1999
AU - Cornils, A.
AU - Schnack-Schiel, S. B.
AU - Hagen, W.
AU - Dowidar, M.
AU - Stambler, N.
AU - Plähn, O.
AU - Richter, C.
N1 - Funding Information:
We thank the captain and crew of RV ‘Meteor’ for their help and collaboration in the field, and Chief Scientist Prof. G. Hempel and Officer Melegi for their guidance and support. Special thanks are due to Ruth Alheit, Berit Finkennest, Kremena Stefanova and Elke Mizdalski for their help in sorting the samples. We greatly appreciate the financial support for the Meteor-cruise 44/2 by the Deutsche Forschungsgemeinschaft (DFG). S.B.S. is grateful to the DFG for financial support for sorting the zooplankton samples (grant SCHI 329/9).
PY - 2005/6/1
Y1 - 2005/6/1
N2 - The distribution pattern, taxonomic composition and community structure of mesozooplankton was studied along a transect with 10 positions between the Gulf of Aqaba and the northern Red Sea. Five positions were resampled two or three times during a cruise of RV 'Meteor' in February/March 1999. In spite of clear differences in the density stratification between the Gulf of Aqaba and the northern Red Sea, the mesozooplankton composition was very similar: Copepods were by far the most abundant taxon, contributing 76-95% to the total community. The remainder was composed largely of ostracods, chaetognaths, appendicularians and molluscs. The mesozooplankton of the deeply mixed stations was homogeneously distributed, at all other stations the bulk of the mesozooplankton (>70%) was concentrated in the mixed surface layer with peaks of calanoids, cyclopoids and appendicularians in the vicinity of the chlorophyll a (Chl a) maximum layer. Ostracods and poecilostomatoids dominated the layers below. Standing stocks within the total water column (550-1200 m) varied between 93 and 431 × 103 individuals m-2 for copepods and 5-76 × 103 individuals m-2 for other mesozooplankton with highest numbers in the northern Gulf of Aqaba, where vertical mixing was deep (400-500 m) and Chl a and mesozooplankton distributions homogeneous throughout the water column. Towards the south, the mixed depth decreased from 300 m in the central Gulf of Aqaba to 50 m in the Red Sea. Cluster analysis separated three distinct groups of stations, compounding the observed differences between the northern Gulf of Aqaba (Position I) and the other positions. The analysis also revealed temporal differences between the February and March sections of the cruise, indicating the winter-spring transition. The stations sampled in March are characterised by a higher total abundance and by a higher percentage of appendicularians and ostracods than the stations sampled in February.
AB - The distribution pattern, taxonomic composition and community structure of mesozooplankton was studied along a transect with 10 positions between the Gulf of Aqaba and the northern Red Sea. Five positions were resampled two or three times during a cruise of RV 'Meteor' in February/March 1999. In spite of clear differences in the density stratification between the Gulf of Aqaba and the northern Red Sea, the mesozooplankton composition was very similar: Copepods were by far the most abundant taxon, contributing 76-95% to the total community. The remainder was composed largely of ostracods, chaetognaths, appendicularians and molluscs. The mesozooplankton of the deeply mixed stations was homogeneously distributed, at all other stations the bulk of the mesozooplankton (>70%) was concentrated in the mixed surface layer with peaks of calanoids, cyclopoids and appendicularians in the vicinity of the chlorophyll a (Chl a) maximum layer. Ostracods and poecilostomatoids dominated the layers below. Standing stocks within the total water column (550-1200 m) varied between 93 and 431 × 103 individuals m-2 for copepods and 5-76 × 103 individuals m-2 for other mesozooplankton with highest numbers in the northern Gulf of Aqaba, where vertical mixing was deep (400-500 m) and Chl a and mesozooplankton distributions homogeneous throughout the water column. Towards the south, the mixed depth decreased from 300 m in the central Gulf of Aqaba to 50 m in the Red Sea. Cluster analysis separated three distinct groups of stations, compounding the observed differences between the northern Gulf of Aqaba (Position I) and the other positions. The analysis also revealed temporal differences between the February and March sections of the cruise, indicating the winter-spring transition. The stations sampled in March are characterised by a higher total abundance and by a higher percentage of appendicularians and ostracods than the stations sampled in February.
UR - http://www.scopus.com/inward/record.url?scp=23944496918&partnerID=8YFLogxK
U2 - 10.1093/plankt/fbi023
DO - 10.1093/plankt/fbi023
M3 - Article
AN - SCOPUS:23944496918
SN - 0142-7873
VL - 27
SP - 505
EP - 518
JO - Journal of Plankton Research
JF - Journal of Plankton Research
IS - 6
ER -
