2.3 Access of climate and tide data
We extracted the data of each site from the WorldClim dataset (Hijmans et al., 2005) for mean annual temperature (MAT) and mean annual precipitation (MAP), and from Global Tidal Forecasting Service (http://global-tide.nmdis.org.cn/) for tide and tidal currents datasets. Specifically, the highest tide, the lowest tide, the fastest tidal current and the slowest tidal current were obtained from the nearest tide station. Since the annual average of the tide data is not available, we used the data of four months (January, April, July and October) to represent the whole year. We calculated the annual highest tide (AHT), annual lowest tide (ALT), annual fastest tide current (AFC) and annual slowest tide current (ASC). We also measured sea surface salinity (SAL) at each site using the Portable Refractometer (Apu, China).