Biodiv Sci ›› 2016, Vol. 24 ›› Issue (7): 767-780.DOI: 10.17520/biods.2015249

Special Issue: 全球气候变化下的海洋生物多样性专辑

• Orginal Article • Previous Articles     Next Articles

Comparison of zooplankton communities inside and outside the Hangzhou Bay in autumn

Dongrong Zhang1,2, Zhaoli Xu1,*(), Jiayi Xu1, Kaixing Dong1,3   

  1. 1 Key and Open Laboratory of Marine and Estuary Fisheries, Ministry of Agriculture of China, East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200090
    2 Key Laboratory of Engineering Oceanography, Second Institute of Oceanography, State Oceanic Administration, People’s Republic of China, Hangzhou 310012
    3 College of Ocean & Earth Science, Xiamen University, Xiamen, Fujian 361102
  • Received:2015-09-15 Accepted:2016-03-11 Online:2016-07-20 Published:2016-08-04
  • Contact: Xu Zhaoli

Abstract:

We analyzed and compared the differences in community composition, K-dominance curves and diversity index (H') of zooplankton community structure characteristics inside and outside the Hangzhou Bay in autumn (outside the bay: 122.10°-122.58° E, 30.54°-30.93° N; inside the bay: the east area of north: 121.67°-121.87° E, 30.68°-30.83° N; the east area of south: 121.60°-121.85° E, 29.95°-30.24° N; the west area of north: 121.31°-121.56° E, 30.58°-30.77° N). Results indicated that there were large differences between the community composition of zooplankton outside the bay and those in the three areas inside the bay. The area outside the bay (community I) was composed of nearshore species such as Pseudeuphausia sinica and nearshore low-salinity species such as Centropages dorsispinatus, followed by offshore species. Community II (the eastern area of south Hangzhou Bay) was composed of nearshore low-salinity species such as Labidocera sinilobata, followed by nearshore species. Community III (the eastern area of north Hangzhou Bay) was mixed with nearshore low-salinity species such as Labidocera euchaeta and estuarine brackish-water species such as Tortanus vermiculus. Community IV (the western area of north Hangzhou Bay) was characterized by the dominant species, Tortanus vermiculus of estuarine brackish-water species that had the highest proportion, which was different from the community I. Generally, the community with lower salinity adaptability appeared in the western and northern areas. According to K-dominance curves, the dominance curves of community I and community III were quite gentle. In addition, the initial cumulative dominance of community III was higher than that of community I. Compared with community I, the initial cumulative dominance of community II and community IV were far higher than that of community I. The initial cumulative dominance of community I (outside the bay) was particularly low, which indicated that there were many types of dominant species in community I, and the dominance of single dominant species was lower than those communities inside the bay. Results of variance analysis indicated that there were highly significant differences between the diversity index of zooplankton outside the bay and those in the other three waters inside the bay (P < 0.01). Meanwhile, there were no significant differences between the three communities inside the bay (P > 0.05). This showed that the diversity index of zooplankton outside the bay was higher than those of the communities inside the bay. The influence of different water masses resulted in zooplankton community differences in the inner and outer waters of the bay.

Key words: Hangzhou Bay, community, cumulative dominance, zooplankton, diversity