Abstract
Inter-annual variations in zooplankton community structure in Prydz Bay were investigated using multivariate analysis based on samples collected with a 330-μm mesh, 0.5-m2 Norpac net during the austral summer from 1999 to 2006. Two distinct communities, an oceanic and a neritic community, were consistently identified in all surveys. Oceanic communities had higher diversity and were indicated by species such as Haloptilus ocellatus, Heterorhabdus austrinus, Thysanoessa macrura, Rhincalanus gigas, Scolecithricella minor and Oikopleura sp.. Neritic communities were indicated by Euphausia crystallorophias and Stephos longipes and were characterized by fewer but more abundant species. In 1999 and 2006, a transitional community was also distinguished near the continental shelf edge, where ice coverage was more extensive than either the oceanic or neritic regions. Significant inter-annual variations in community structure (mainly involving species abundance rather than species composition) were found in both oceanic and neritic communities, being more obvious in the latter. The timing and amplitude of sea ice retreat (polynya appearance), and its effect on food availability, had strong influences on zooplankton community structure. In oceanic communities during years with earlier ice retreat, the extra time available for phytoplankton blooms to accumulate resulted in a higher proportion of large copepods (Calanoides acutus, Calanus propinquus, Metridia gerlachei) (especially the younger copepodites) in the zooplankton assemblage. In neritic communities, zooplankton such as the ice krill E. crystallorophias, and large copepods (C. acutus, C. propinquus, M. gerlachei), also showed higher abundance and earlier developmental stages in years with larger polynya. On the other hand, in years with later ice retreat, smaller polynya, and less time for phytoplankton blooms to form, the abundance of large copepods was lower and older age classes were more common.
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Acknowledgments
Thanks are due to all those who aided the collection of this data set: Y. Zhang, G. Zhang, H. Liu, P. Ji as well as the captain and crew of the RV ‘Xuelong’. We would like to thank NOAA for providing the sea ice data. We are also grateful to J. Shi for providing the temperature and salinity data and to C. Hu for the chlorophyll a data. Thanks also go to Dr. Angus Atkinson and Dr. Astrid Cornils for the help in species identification. Dr A. Atkinson, two anonymous referees and Editor In Chief Dieter Piepenburg substantially improved the final version of the manuscript. This research was supported by NSFC project (No. 40821004), National Key Technologies R&D Program of China (No. 2006BAB18B07) and the China IPY program.
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Yang, G., Li, C. & Sun, S. Inter-annual variation in summer zooplankton community structure in Prydz Bay, Antarctica, from 1999 to 2006. Polar Biol 34, 921–932 (2011). https://doi.org/10.1007/s00300-010-0948-z
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DOI: https://doi.org/10.1007/s00300-010-0948-z