Chinese Journal of Oceanology and Limnology

, Volume 30, Issue 4, pp 507–518

Changes in the small-jellyfish community in recent decades in Jiaozhou Bay, China

Authors

  • Song Sun孙松
    • Jiaozhou Bay Marine Ecosystem Research Station, Institute of OceanologyChinese Academy of Sciences
    • Key Laboratory of Marine Ecology and Environmental Sciences, Institute of OceanologyChinese Academy of Sciences
  • Yinghong Li李颖虹
    • Bureau of Science and Technology for Resources and EnvironmentChinese Academy of Sciences
    • Graduate University of Chinese Academy of Sciences
    • Jiaozhou Bay Marine Ecosystem Research Station, Institute of OceanologyChinese Academy of Sciences
Biology

DOI: 10.1007/s00343-012-1179-7

Cite this article as:
Sun, S., Li, Y. & Sun, X. Chin. J. Ocean. Limnol. (2012) 30: 507. doi:10.1007/s00343-012-1179-7

Abstract

We used long term monitoring data to evaluate changes in abundance and species dominance of small-jellyfish (collected with zooplankton net whose bell diameter was less than 5 cm) between 1991 and 2009 in the Jiaozhou Bay, China. Zooplankton samples were vertically towed with conical plankton net from near-bottom to surface, identified microscopically, and mapped in time-space using Grapher 7.0 and Surfer 8.0. Results show that the abundance of small-jellyfish throughout the bay had been increasing during 2001–2009 on average of 15.2 ind./m3, almost 5 times higher than that between 1991 and 2000. The occurrence of peak abundance shifted from spring to summer after 2000, and two peaks appeared in spring and summer, respectively, after 2005. Both the abundance and the frequency of blooms of small-jellyfish increased after 2000 in the bay. In addition, the biodiversity of jellyfish has increased significantly in recent years with a change in dominant species. Several new dominant species appeared after 2000, including Rathkae octopunctata in winter, Phialidium hemisphaericum in spring, summer, and autumn, Phialucium carolinae in spring, and Pleurobrachia globosa in summer and autumn, while some previous dominant species throughout the 1990s (Eirene ceylonensis, Zanclea costata, Lovenella assimilis, and Muggiaea atlantica ) were no longer dominant after 2000. The abundance of small-jellyfish was positively correlated with the density of dinoflagellates, and the abundance of zooplankton. We believe that the changes in smalljellyfish abundance and species composition were the result of eutrophication, aquaculture and coastal construction activities around the bay. Concurrently, seawater warming and salinity decrease in recent decades promoted the growth and reproduction of small-jellyfish in the bay.

Keyword

jellyfishabundancespecies compositionJiaozhou Bay

Copyright information

© Chinese Society for Oceanology and Limnology, Science Press and Springer-Verlag Berlin Heidelberg 2012