| Title | The seasonal succession of zooplankton in the Southern Ocean south of Australia; Part II, The sub-Antarctic to Polar frontal zones |
| Author | Hunt, B.P.V.; Hosie, G.W. |
| Author Affil | Hunt, B.P.V., University of British Columbia, Department of Earth and Ocean Science, Vancouver, BC, Canada. Other: Australian Antarctic Division, Australia |
| Source | Deep-Sea Research. Part I: Oceanographic Research Papers, 53(7), p.1203- 1223. Publisher: Elsevier, Oxford, International. ISSN: 0967- 0637 |
| Publication Date | July 2006 |
| Notes | In English. 84 refs. GeoRef Acc. No: 300779. CRREL Acc. No: 64005213 |
| Index Terms | plankton; polar regions; statistical analysis; polar regions; Southern Ocean; Antarctic Circumpolar Current; communities; Foraminifera; Invertebrata; living taxa; multivariate analysis; Protista; seasonal variations; subantarctic regions; zooplankton |
| Abstract | Between October 2001 and March 2002 six transects were completed at monthly intervals in the Sub-Antarctic Zone (SAZ) and Inter-Sub-Antarctic Front Zone (ISAFZ)/Polar Frontal Zone (PFZ) in the Southern Ocean south of Australia. Zooplankton were collected with a Continuous Plankton Recorder and NORPAC net and multivariate analysis was used to analyse the seasonal succession of communities. Despite strong, seasonally consistent, biogeographic differences between the SAZ and ISAFZ/PFZ, community structure in all zones was dominated by a suite of common taxa. These included the ubiquitous Oithona similis, foraminiferans and appendicularians (Core taxa), occurring in ›97% of samples and contributing an average of 75% to total sample abundance, and Calanus simillimus, Rhincalanus gigas, Ctenocalanus citer, Clausocalanus brevipes, Clausocalanus laticeps, Oithona frigida, Limacina spp. and chaetognaths (Summer taxa), present in ›57% of samples and occurring at seasonally high densities. Because of the dominance of the Core and Summer taxa, the seasonal succession was most clearly evident as a change in zooplankton densities. In October densities averaged ‹15 ind m-3, rising to 52 ind m-3 (max=92 ind m-3) in November, and subsequently increasing slowly through to January (ave=115 ind m-3; max=255 ind m-3). Densities peaked abruptly in February (ave=634 ind m-3; max=1593 ind m-3), and remained relatively high in March (ave=193 ind m-3; max=789 ind m-3). A latitudinal lag in seasonal development was observed with peak densities occurring first in the SAZ (February) and then in the ISAFZ/PFZ (March). The seasonal community succession was strongly influenced by species population cycles. The role of zooplankton in biogeochemical cycling in the SAZ and ISAFZ/PFZ was discussed in the light of past sediment trap data collected from the study area. |
| URL | http://hdl.handle.net/10.1016/j.dsr.2006.05.002 |
| Publication Type | journal article |
| Record ID | 88768 |