Niche analysis of diatoms in Fenhe river and Fenhe reservoir

Abstract

Abstract: The niche breadths and overlaps of 50 main diatoms species in the Fenhe river and Fenhe reservoir were measured using the formulas proposed by Levins and Petraitis,and the relationships between niche breadth and niche overlaps were discussed in this paper.The results showed that the niche breadths of Navicula atom,Cyclotella ocellata,Cymbella prostrate,Nitzschia apiculata,Navicula exigua,Achnanthes linearis, and Navicla arvensis in attached diatoms and the Cyclotellastelligera,C.glomerata,and C.ocellale in planktonic diatoms were greater,which was related with their own characteristics and the capability of adaptation to the environment.The niche overlaps among the species with the same or similar environment requirements were greater,while those between the species with broad niche breadth and other species were much greater.In Fenhe river,the aggression of Diatoma vulgare was the strongest,while in the reservoir ,the aggression of Achnanthes biasolettiana was the strongest.

Key words: Rice(Oryza sativa L), Grain weight, Developmental genetics, Heterosis, Genetic relation

CLC Number:

Q178

WANG Cuihong, ZHANG Jintun. Niche analysis of diatoms in Fenhe river and Fenhe reservoir[J]. cje, 2004, (3): 58-62.

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