Temperature Effects on Life-History Traits of Duolandrevus (Eulandrevus) ivani (Orthoptera: Gryllidae)
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Recent disease outbreaks of the two-spotted field cricket (Gryllus bimaculatus) have caused mass mortalities, underscoring the urgent need for alternative insect species in sustainable feed production. This study was conducted to provide a preliminary assessment of the optimal rearing temperature for the indigenous Korean cricket Duolandrevus (Eulandrevus) ivani. Growth, adult emergence, survival, and body weight were compared under three temperature conditions (20, 25, and 30 °C). Growth curve and area under the curve (AUC) analyses indicated that development was delayed and final body weight was lower at 20 °C (AUC = 2.92). In contrast, AUC values at 25 °C and 30 °C were more than threefold higher (10.98 and 12.32, respectively), and both groups reached a similar final weight of approximately 0.63 g. Adult emergence began at week 14 under 30 °C and reached 100% by week 23, whereas emergence at 25 °C began at week 15 and continued until week 31. Mean adult survival times were comparable among treatments (20 °C: 26.5 weeks, 25 °C: 27.7 weeks, 30 °C: 26.6 weeks). Sex significantly affected adult body weight (ηₚ² = 0.125), with females being heavier than males. In summary, at 25 °C and 30 °C, there was little effect on the survival of adult D. ivani, while growth and emergence were favored. This study provides the first experimental evidence supporting the potential of D. ivani as an alternative to G. bimaculatus. These findings offer a foundation for its industrial utilization.
Abstract
Recent disease outbreaks of the two-spotted field cricket (Gryllus bimaculatus) have caused mass mortalities, underscoring the urgent need for alternative insect species in sustainable feed production. This study was conducted to provide a preliminary assessment of the optimal rearing temperature for the indigenous Korean cricket Duolandrevus (Eulandrevus) ivani. Growth, adult emergence, survival, and body weight were compared under three temperature conditions (20, 25, and 30 °C). Growth curve and area under the curve (AUC) analyses indicated that development was delayed and final body weight was lower at 20 °C (AUC = 2.92). In contrast, AUC values at 25 °C and 30 °C were more than threefold higher (10.98 and 12.32, respectively), and both groups reached a similar final weight of approximately 0.63 g. Adult emergence began at week 14 under 30 °C and reached 100% by week 23, whereas emergence at 25 °C began at week 15 and continued until week 31. Mean adult survival times were comparable among treatments (20 °C: 26.5 weeks, 25 °C: 27.7 weeks, 30 °C: 26.6 weeks). Sex significantly affected adult body weight (ηₚ² = 0.125), with females being heavier than males. In summary, at 25 °C and 30 °C, there was little effect on the survival of adult D. ivani, while growth and emergence were favored. This study provides the first experimental evidence supporting the potential of D. ivani as an alternative to G. bimaculatus. These findings offer a foundation for its industrial utilization.