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| Predation on Gray Planthopper Laodelphax striatellus by Chinese Mitten Crab Eriocheir sinensis in Rice-Crab Co-Culture |
| WANG Yuquan1, FAN Sining1, YU Yilin1, MEI Jie1, SUN Na2, LIANG Xiaochen1, LIU Xueshen3, LI Xiaodong1,2 |
1. Shenyang Agricultural University, Shenyang 110866, China;
2. Liaoning Provincial Key Laboratory of Chinese Mitten Crab Breeding, Panjin Guanghe Crab Industry Co., Ltd., Panjin 124200, China;
3. Dalian Ocean University, Dalian 116023, China |
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Abstract In order to explore the predation of gray planthopper Laodelphax striatellus by Chinese mitten crab Eriocheir sinensis in rice-crab co-culture, field trial and laboratory test were carried out in Panjin Guanghe Crab Industry Co., Ltd., in Dawa District, Panjin City, Liaoning Province, from June 10 to September 24, 2020. The changes in the number of gray planthoppers were measured in the field by a pot shooting method, the gastrointestinal food contents were analyzed in the Chinese mitten crab in the field, and effects of Chinese mitten crab with body weight of 12-24 g, as well as the female crabs with body weight of (20±4) g and (10±2) g, sex, and short-term starvation on the predation function of the Chinese mitten crab on the gray planthopper were simulated in a laboratory to probe the predation mechanism of the Chinese mitten crab with body weight of 12—24 g on the gray planthopper in the field. The results showed that there was decrease in number of gray planthopper by 53.05% in field trial and 51.5% in laboratory test compared with that in the field without Chinese mitten crab, with significantly more gray planthopper in the field with large Chinese mitten crab than in the field with small Chinese mitten crab higher than that in the filed with small ones (P<0.01). The Chinese mitten crab exposed to short-term starvation had significantly higher feeding ability of gray planthopper than that in the satiety group (P<0.01), without significant difference in the feeding ability between male and female individuals. Therefore, the increase in body weight and short-term starvation can lead to significantly enhance the ability of Chinese mitten crab to prey on gray planthoppers, and the three predatory functional response models are in line with the Holling Ⅱ equation.
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Received: 18 September 2021
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