Effect of temperature on development, sexual maturation time, food consumption and body weight of Schistocerca gregaria Forsk. (Orthoptera: Acrididae)

Bu çalışma, sıcaklığın S. gregaria' da gelişme, eşeysel olgunlaşma süresi, besin tüketimi ve vücut ağırlığına etkisini belirlemek amacıyla 25 ve 30¡C sıcaklıklarda yapılmıştır. Böcekler taze buğday çimi ve kepekle beslenmiştir. Sıcaklık arttırıldığında hem gelişme süresi hem de eşeysel olgunlaşma süresi kısaldı. 25 ve 30¡C de toplam nimfal gelişme süresi sırasıyla 32 ve 22 gün oldu. Benzer şekilde ortalama eşeysel olgunluğa ulaşma süresi 30¡C de 33 gün olurken 25¼C de 52 gün oldu. Böceklerin besin tüketimi ergin hayatın ilk haftasının sonuna kadar sıcaklık artışıyla birlikte arttı, daha sonra azaldı. Birinci nimf evresinden ergin hayatın ilk haftas ının sonuna kadar her hayvan 25¡C de 23,82 g buğday çimi ve 4,27 g kepek tüketirken 30¡C de 25,41 g buğday çimi ve 4,27 g kepek tüketti. Bununla birlikte ergin hayatın ilk haftasından eşeysel olgunluğa kadar 25¡C de yetiştirilen her böceğin besin tüketimi 10,81 g buğday çimi ve 1,01 g kepek olurken, 30¡C de sırasıyla 6, 97 ve 0,84 g oldu. Deneysel sürenin sonunda 25 ve 30¡C de yetiştirilen böceklerin vücut ağırlıkları yaklaşık olarak aynıydı.

Sıcaklığın Schistocerca gregaria Forsk (Orthoptera: Acrididae)' da gelişme, eşeysel olgunlaşma, besin tüketimi ve vücut ağırlığına etkisi

This study was carried out to determine the effect of temperature on the development, sexual maturation time, food consumption and body weight of S. gregaria, Forsk., at 25 and 30şC. The insects were fed on fresh wheat sprouts (FWS) and bran (B). When the temperature was increased, both developmental time and attainment time to sexual maturation were shortened. Total nymphal developmental time at 25 and 30şC was 32 and 22 days, respectively. Similarly, the average attainment time to sexual maturity was 33 days at 30şC, whereas it was 52 days at 25şC. The food consumption of the insects increased at higher temperatures until the end of the first week of adult life and decreased thereafter. From the first nymphal stages to the end of the first week of adult life, each animal consumed 23.82 g FWS and 4.27 g B at 25şC, and 25.41 g FWS and 4.27 g B at 30şC. However, from the second week of adult life to sexual maturation, the food consumed by each insect reared at 25şC was 10.81 g FWS and 1.01 g B, whereas at 30şC it was 6.97 and 0.84 g, respectively. At the end of experimental period, the final weight of the insects reared at 25 and 30şC was about the same.

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