《Table 4.Percentage of variance explained by the environmental variables used in CCA》

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《The impact of biotic and abiotic factors on the distribution of surface sediment dinoflagellate cyst assemblages on the Nanji Island in the East China Sea》

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Note:Bold variables are significant at the 5%significance level（P≤0.05）.cdia represents the diatom concentration.

The distribution of dinocysts is generally accepted to be controlled by the trophic characteristic of the original upper water column（Devillers and De Vernal，2000；Nagai et al.，2004）.Dinocysts have also been considered indicators of eutrophication and are deeply reviewed by Dale in 2009（Dale，2009；Matsuoka，1999；Matsuoka et al.，2003）.Species richness，total cyst concentrations and fluxes，proportions of some heterotrophic species，and abundance of indicator species could respond to eutrophic signals（Pospelova et al.，2002；Shin et al.，2013b），particularly Brigantedinium spp.，Lingulodinium polyedrum and species belonging to Protoperidinioid，Polykrikaceae and Diplopsalidaceae（Dale，2009；Harland et al.，2004；Matsuoka et al.，2003；Radi et al.，2007）.The cyst abundance might show a significant positive correlation with the nutrient gradients（Liu et al.，2012）；however，this may not be true for highly eutrophic and polluted regions where the dinocyst diversity may be adversely influenced（Pospelova et al.，2005）.The Nanji sea area exhibited a seasonal eutrophication characteristic，which stated from a slight to moderate level，due to the effect by anthropogenic pollutants expanded from the Aojiang River.The eutrophic conditions were only detected in early spring and autumn around the study area（Table 2and Fig.3）.In the winter samples，Nanji coastal waters exhibited substantially significant heterotrophic morphotypes，with a proportion of 51%mainly belonging to the group of Protoperidinium.In the other eutrophic sample assemblage（autumn），autotrophic cysts constituted 76%of all cell counts，characterizing a distinguishing eutrophic signal with elevated phytoplankton productivity（Dai et al.，2012；Dale，2009）.In addition，many Protoperidinium species are proved to preferentially feed on large diatoms（Sherr and Sherr，2007）.The high proportion of heterotrophic dinocysts in the winter sediment samples is consistent with the diatom-dominated planktonic community during that period.