Avcı Akar Neoseiulus californicus (McGregor)’un Tetranychus cinnabarinus Boisduval Üzerinde Gelişme, Üreme ve Av Tüketim Kapasitesi

Avcı akar Neoseiulus californicus (McGregor)’ un Aydın populasyonunun farklı sıcaklıklarda (%65 ± 10 nem ve 16A:8K) Tetranychus cinnabarinus Boisduval üzerinde gelişme, üreme ve av tüketim kapasitesi araştırılmıştır. Sıcaklığın artması ile birlikte N. californicus’un toplam gelişme süresinin kısaldığı saptanmıştır (0.012 × T – 0.093; R2 = 0.950). Neoseiulus californicus’un gelişme eşiği regresyon denkleminden yararlanılarak hesaplanmış ve gelişme eşiğinin 7.8 °C olduğu belirlenmiştir. Bu değerlerden N. californicus’un toplam gelişme süresi için gerekli sıcaklıklar toplamı ise 83.3 gün-derece olarak hesaplanmıştır. Neoseiulus californicus’ un toplam ve günlük yumurta üretimi 25 °C’de en yüksek elde edilmiş ve bu sıcaklıktaki veriler 20 ve 30 °C’de elde edilenlerden istatistiki olarak farklı bulunmuştur. Net üreme gücü (R0), en yüksek 25 °C (42.92 Â/Â)’de saptanmıştır. Ortalama döl süresi (T0) en uzun 20 °C (12.96 gün)’de, en kısa 30 °C (10.12 gün)’ de saptanmıştır. Kalıtsal üreme yeteneği (rm) en yüksek 25 °C (0.3373 Â/Â/gün)’ de, en düşük 20 °C (0.2467 Â/Â/gün)’ de bulunmuştur. Neoseiulus californicus’ un günlük olarak tükettiği T. cinnabarinus yumurta, larva, nimf ve ergin erkek dönemlerinin sayıları ile av yoğunlukları arasında istatistiki olarak önemli fark bulunmuştur. Av yoğunluğu dikkate alınmadığında, T. cinnabarinus’ un yumurta ve larva dönemleri, nimf ve ergin erkeklere göre daha fazla tüketilmiştir. Neoseiulus californicus’ un işlevsel tepki tipi Holling modelinin II. işlevsel tepki tipine uymaktadır. Tetranychus cinnabarinus’ un yumurta dönemi ile beslendiğinde, N. californicus’ un bıraktığı yumurta sayısı en yüksek bulunmuştur.

Anahtar Kelimeler:

Neoseiulus californicus, Tetranychus cinnabarinus, gelişme, avlanma kapasitesi, üreme, ömür uzunluğu

Development, Fecundity, and Prey Consumption of Neoseiulus californicus (McGregor) Fed Tetranychus cinnabarinus Boisduval

The development, fecundity, and prey consumption of the Aydın Neoseiulus californicus population (McGregor) feeding on Tetranychus cinnabarinus Boisduval were studied in the laboratory at different temperatures, 65 ± 10% RH, and a 16 h L:8 h D cycle. The total development period (egg to adult) decreased linearly with increasing temperature (0.012 × T - 0.093; R2 = 0.950). The total development threshold obtained from regression analysis was estimated to be 7.8 °C. Neoseiulus californicus required, on average, 83.3 DD to complete its development from egg to adult. Mean total and daily fecundity were highest at 25 °C, and were statistically different from those obtained at 20 and 30 °C. The net reproductive rate (R0) was highest at 25 °C (42.92 F/F). The longest mean generation period (T0) occurred at 20 °C (12.96 days) and the shortest occurred at 30 °C (10.12 days). The highest intrinsic rate of increase (rm) for N. californicus was observed at 25 °C (0.3373 F/F/day) and the lowest was at 20 °C (0.2467 F/F/day). The numbers of T. cinnabarinus eggs, larvae, nymphs, and adult males eaten by N. californicus were significantly different between prey densities. Regardless of prey density, N. californicus consumed more eggs and larvae than nymphs and adult males. The functional response data of N. californicus fit reasonably well to a type-II functional response of the Holling model. The number of eggs laid by female N. californicus was the highest when T. cinnabarinus eggs were offered as prey.

Keywords:

Neoseiulus californicus, Tetranychus cinnabarinus, development, predation, reproduction, longevity,

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