Üç farklı büyüklükteki alanda Hyalopterus pruni (Geoffroy) (Homoptera: Aphididae) üzerinde beslenen Oenopia conglobata (L.) (Coleoptera: Coccinellidae)'nın işlevsel tepkisi

Functional response of Oenopia conglobata (L.) (Coleoptera: Coccinellidae) on Hyalopterus pruni (Geoffroy) (Homoptera: Aphididae) in three different size arenas

Abstract

This study was carried out to determine the functional response of Oenopia conglobata (L.) to Hyalopterus pruni (Geoffroy) in petri dishes of 6, 8 and 12 cm diameters and at 20, 40, 80, 160 and 320 prey densities. Experiments were carried out in a climate chamber set at 25±1 °C, 65+5 % RH and 16:8 (L.:D) h photoperiod. Consumption by all larval instars of O. congiobata increased with increasing prey densities up to 80 in petri dishes of 6, 8 and 12 cm diameters. A further increase in prey density (to 160 and 320 aphids) did not result in higher prey consumption for all larval stages. The daily food consumption by adult females of O. conglobata in all petri dishes increased with increasing prey densities. Increasing petri dish diameters did not affect prey consumption by all larval stages and adults of O. congiobata. Handling time decreased linearly as life stages developed. Handling time according to life stage was significantly different, but differences between $3^{rd}$ and $4^{th}$ instar larvae were not significant. Handling time did not affect by petri dish diameters. Search rate according to life stage was significantly different but no differences occurred among $2^{nd}$ , $3^{rd}$ and $4^{th}$ instar larvae. Search rate decreased as life stage developed but increased when petri dish diameters increased.

Özet

Bu çalışmada Hyalopterus pruni (Geoffroy)'nin 20, 40, 80, 160 ve 320 av yoğunluklarında 6,8 ve 12 cm'lik petrilerde beslenen Oenopia conglobata (L)'nın işlevsel tepkisi saptanmıştır. Üç farklı çapta petri kaplarında beslenen avcı böceğin tüm larva dönemlerinde tükettikleri av sayıları arasında istatistiki olarak fark olmamasına karşılık, ergin dişilerde petri çapı arttıkça tüketilen av sayısı da artmıştır. Avını yakalama süresi ve arama oranı larva dönemleri arttıkça azalmış ve ergin dişide en az olmuştur. Petri çaplarına göre ise avını yakalama süreleri arasında bir fark görülmezken, alan arttıkça avını arama oranı da artmıştır.