Functional response of two coccinellid predators, Scymnus levaillanti and Cycloneda sanguinea, to the cotton aphid Aphis gossypii

Avcı iki coccinellid türü, Scymnus levaillanti ve Cycloneda sanguinea'nm pamuk yaprakbiti, Aphis gossypifye karşı farklı sıcaklıklardaki işlevsel tepkileri laboratuar koşullarında çalışılmıştır. Her iki coccinellid türü de farklı işlevsel tepki göstermiştir. Daha büyük tür olan, C. sanguinea'nın, daha küçük tür olan S. levaillantfye göre her sıcaklıkta daha fazla yaprakbiti tükettiği görülmüştür. Her iki coccinellid türünün ergin dişileri en fazla ilk üç saatlik zaman diliminde beslenmişlerdir ve bundan dolayı, ilk üç saatlik dilimdeki vücut ağırlığı artışı ve her iki coccinellid türü tarafından tüketilen yaprakbiti sayısı her sıcaklıkta ilk üç saatten sonraki zaman diliminden daha fazla bulunmuştur. Her iki coccinellid türünün pamuk yaprakbiti tüketimi, her sıcaklıkta tip II işlevsel tepki göstermiştir. Tip II işlevsel tepki modelinden elde edilen parametreler, C. sanguninea'nın pamuk yaprakbitini S. levaillantfye göre daha kısa sürede tükettiğini ve avını daha etkin aramadığını ve dolayısıyla doyuma ulaşması için daha fazla yaprakbitine gereksinim duyduğunu göstermiştir. Bu yüzden pamuk yaprakbiti popülasyonunun yüksek olduğu durumlarda, C. sanguinea'nın S. levaiilantfye göre pamuk yaprakbiti popülasyonunu baskı altına almada daha başarılı olabileceği görülmüştür.

İki avcı coccinellid türü, Scymnus levaillanti ve Cycloneda sanguinea' nın pamuk yaprak biti, Aphis gossypii' ye karşı işlevsel tepkisi

Functional responses of 2 female coccinellid predators, Scymnus levaillanti and Cycloneda sanguinea, to the cotton aphid, Aphis gossypii, at various temperatures were studied under laboratory conditions. Both coccinellid species showed different functional responses to the cotton aphid. The larger species, C. sanguinea, was seen to eat more aphids than the smaller species, S. levaillanti, at each temperature, due to its greater voracity. The female adults of both coccinellid species feed maximally during the first 3 h and therefore, the increase in fresh weight gain and number of aphids killed by both coccinellid species are much higher during the first 3 h at each temperature than those during the following 3 h intervals. The consumption of cotton aphids by both coccinellid species had a type II functional response at each temperature. The parameters estimated from the type II functional response model suggest that C. sanguinea can be more effective at suppressing cotton aphid populations than S. levaillanti when the cotton aphid populations are large. This is because they have less time to process the cotton aphids and are more efficient searchers, requiring more cotton aphids to reach satiation than S. levaillanti.

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