Seasonal Succession Characteristics of the Morphologically-based Functional Groups (MBFG) in Deep-water Reservoir

Abstract

Morphologically-based functional groups (MBFG) is the basis for a simple way of distinguishing the phytoplankon to cluster species according to their similar morphological traits observed by optical microscope.In order to understand the application of morphologically-based functional groups (MBFG) in the research on phytoplankton community structure and variation of deep-water reservoir,as well as the succession characteristics of algae,the Jinpen Reservoir was studied from August 2011 to July 2013.Using morphologically-based functional groups (MBFG),the phytoplankton communities found in the reservoir were classified to functional groups,and the relations between the morphologically-based functional groups succession and environment cases were explored with redundancy analysis (RDA) method.The results suggested that five morphologically-based functional groups were found in the reservoir,namely Ⅱ,Ⅳ,Ⅴ,Ⅵ,Ⅶ;The succession of reservoir algal functional groups had seasonal characteristics,a variety of Morphologically-based functional groups coexisted in spring and summer,while reservoir algal functional groups were relatively simple in autumn and winter;meanwhile,the density of each morphologically-based functional group decreased with the increase of water depth among the environmental factors,morphologically-based functional groups Ⅳ and Ⅵ were respectively affected by temperature;the other water layers of the reservoir morphologically-based functional groups Ⅵ was significantly affected by TN content.