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    STUDIA BIOLOGIA - Issue no. 1 / 2011  
         
  Article:   AQUATIC INVERTEBRATE DRIFT IN SOMEŞUL CALD RIVER WITH SPECIAL REGARDS ON EPHEMEROPTERA TAXA.

Authors:  ANCA AVRAM, MIRELA CÎMPEAN. 		 
       
         
  Abstract:  Drift of aquatic invertebrates were studied in the River Someşul Cald. Samples were collected every 3 hours on the 10th and 11th August 2005 during a 24 hour period. Specimens were sorted into higher taxonomic units and counted. Mayflies (Ephemeroptera) were identified to the lowest level possible and measured. According to the results both the number and size of mayflies entering the drift increased during the night. Principal Component Analysis (PCA) and Canonical Correspondence Analysis (CCA) ordination sustains that light is an important factor influencing the drift behaviour of mayflies. Rhithrogena circumtatrica was cited for the first time in Romania in the present paper.

Keywords: aquatic communities, drift, Ephemeroptera (mayflies), the Someşul Cald River. 		 
         
     
         
         
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