Nallıhan Kuş Cenneti’ndeki (Sarıyar Rezervuarı, Ankara) Balıkçılların (Gece Balıkçıl›: Nycticorax nycticorax, Gri Balıkçıl: Ardea cinerea and Küçük Ak Balıkçıl: Egretta garzetta) Yuva Yeri Özellikleri ve Yuva Yoğunlukları

Bu çal›flmada, Nall›han Kufl Cenneti’nde bal›kç›llar›n (gri bal›kç›l: Ardea cinerea; gece bal›kç›l›: Nycticorax nycticorax ve küçük akbal›kç›l: Egretta garzetta) yuvalanma yeri özellikleri ve yuva yo¤unluklar› araflt›r›lm›flt›r. Üreme kolonisinin bulundu¤u alanda, 92 tanesi sö¤üt ve 74 tanesi kavak a¤ac› olmak üzere, toplam 166 a¤aç vard›r. Bu a¤açlardan 105’inin, bal›kç›llar taraf›ndan yuvalama amac› ile iflgal edildi¤i gözlenmifltir (63 sö¤üt and 42 kavak). Örneklenen a¤açlarda (n: 40), toplam olarak 395 yuva (gece bal›kç›l›: 254, gri bal›kç›l: 103; küçük akbal›kç›l: 38) say›lm›flt›r ve bu yuvalardan 244’ü sö¤üt a¤açlar›nda (gece bal›kç›l›: 170; gri bal›kç›l: 44; küçük akbal›kç›l: 30); 151’i ise kavak a¤açlar›ndad›r (gece bal›kç›l›: 84; gri bal›kç›l: 59; küçük akbal›kç›l: 8). Yuvalarla iflgal edilmifl a¤açlardaki toplam yuva say›s› 1037 ve yuva yo¤unlu¤u ise 0,027 yuva m2 olarak hesaplanm›flt›r. Bununla birlikte bal›kç›llara ait yuva yo¤unluklar› aç›s›ndan sö¤üt (4.07 ± 3.54 yuva/a¤aç) ve kavak a¤açlar› (2.52 ± 2.04 yuva/a¤aç) aras›ndaki farkl›l›k istatistiksel olarak önemsiz bulunmufltur.

Anahtar Kelimeler:

Yuva yo¤unlu¤u, bal›kç›l türleri, Nall›han Kufl Cenneti

Nest Site Characteristics and Nest Densities of Ardieds (Night Heron: Nycticorax nycticorax, Grey Heron: Ardea cinerea, and Little Egret: Egretta garzetta) in the Nallıhan Bird Sanctuary (Sarıyar Reservoir, Ankara, Turkey)

In this study, the nesting site characteristics and nest densities of ardeids (grey heron: Ardea cinerea; night heron: Nycticorax nycticorax, and little egret: Egretta garzetta) were investigated in Nallıhan Bird Sanctuary. It was found that the site of breeding colony had 166 trees consisting of willows (92) and poplars (74); 105 of which (63 willow and 42 poplar) were found occupied by ardeid nests. In the sampled trees (n = 40), 395 nests (night heron: 254, grey heron: 103, and little egret: 38) were located; 244 of which were located in willows (night heron: 170, grey heron: 44; little egret: 30) and 151 (night heron: 84, grey heron: 59; little egret: 8) in poplars. Also the number of nests and nest density for the 105 occupied trees were calculated as 1037 and 0,027 nest/m2, respectively. However, the difference between willows (4.07 ± 3.54 nest/tree) and poplars (2.52 ± 2.04 nest/tree) in terms of nest densities of ardeids were statistically insignificant.

Keywords:

Nest densities, ardeid species, Nallıhan Bird Sanctuary,

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