《Table 3.Groups, biological and paleontological names of dinocysts identified in surface sediment》

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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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Multivariate analyses were performed year-round using the Canoco software version 5.0 for Windows system（Braak and?milauer，2012）to examine relationships between environmental parameters and dinocysts on a quantitative basis.Taxa that represented less than 5%of the total abundance in each sample were defined as rare taxa and excluded from an ordination matrix（Leira and Sabater，2005）.In addition，phytoplankton community/bloom was introduced into the analysis as a descriptive variable.An analysis model was recommended by Canoco adviser based on the length of the first gradient，which is 3.42（Table 1），indicating a characteristic of the unimodal response of cyst concentration to abiotic factors（Braak and?milauer，2012）.A detrended correspondence analysis（DCA）and a canonical correspondence analysis（CCA）were used eventually.In the DCA，detrending by segments was applied to eliminating the arch effect between the first and subsequent axes.In the CCA，only variables of significance（P<0.05）were chosen by forward selection and then plotted using arrows and symbols for quantitative and descriptive variables，separately.