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    STUDIA BIOLOGIA - Issue no. 2 / 2009  
         
  Article:   NESTING AND REPRODUCTIVE CHARACTERISTICS OF THE GREAT CRESTED GREBE (PODICEPS CRISTATUS) BREEDING IN CÂMPENEŞTI PONDS FROM NW ROMANIA.

Authors:  ALEXANDRU-NICOLAE STERMIN, ALIN DAVID, IOAN COROIU. 		 
       
         
  Abstract:  The paper presents the results of nest and reproductive characteristics of the Great Crested Grebe (Podiceps cristatus) population that breeds solitary in the Câmpeneşti ponds (Cluj County, NW Romania), investigated between 2006 and 2007. We have studied the dimensional parameters of nest (external and internal diameter), water depth at the nesting site, clutch and egg size. The goal of this paper is to provide basic data on the breeding ecology of the Great Crested Grebe in the South-Eastern area of the species’ geographic range. Average clutch size was of 3.31 ± 0.48 in 2006 (n=17) and 3.83 ± 1.04 in 2007 (n=28). Water depth at the place of nesting varied between 60-147 cm in 2006 and 79-120 cm in 2007. Repeatability between dimensions of all eggs measured in this study was not very high (0.408 - 0.457). However, we noticed a low within clutch variation of egg traits.

Keywords: Clutch size, egg size, nest characteristics, repeatability
  
         
     
         
         
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