World Wildlife Fund.What is an ecoregion?http://wwf.panda.org/about_our_earth/ecoregions/about/what_is_an_ecoregion/,2011-09-15.
[4]
Abell R,Thieme M L,Revenga C,et al.Freshwater ecoregions of the world:A new map of biogeographic unitsfor freshwater biodiversity conservation.BioScience,2008,58(5):403~414.
[5]
Spalding M D,Fox H E,Allen G R,et al.Marine ecoregions of the world:A bioregionalization of coast and shelfareas.BioScience,2007,57(7):573~583.
[6]
Jenerette G D,Lee J,Waller D W,et al.Multivariate analysis of the ecoregion delineation for aquatic Systems.Environmental Management,2002,29(1):67~75.
Gao Y N,Gao J F,Chen J F,et al.Regionalizing aquatic ecosystems based on the river subbasin taxonomy concept and spatial clustering techniques.International Journal of Environmental Research and Public Health,2011,8(11):4367~4385.