In a 95-day, integrated rice-crayfish (Procambarus clarkii) culture experiment, the changes in the contribution of feed sources, intra-sexual isotopic niche width, inter-sexual isotopic niche overlap, and potential competition were analyzed. The contribution of plants available for crayfish decreased over the culturing time, whereas the contribution of animal feed sources increased accordingly, and that of the cannibalized feed sources increased initially and then decreased. In contrast, the contribution of detritus as a feed source decreased initially and then increased. Female crayfish made higher contributions to inter-sexual cannibalism than intra-sexual cannibalism on August 28 and September 24, whereas these contributions were higher for male crayfish on September 24 and October 20. Double inter-sexual cannibalism occurred in the middle and later periods of the trial. The isotopic niche of crayfish ascend in the direction of the δ¹⁵N axis on September 24 and then decreased and contracted by October 20. The isotopic niche of males and the total population decreased over culturing time, occupying a larger isotopic niche than females at the same time point, and the isotopic niche of males decreased more slowly than that of females. The inter-sexual overlap of the isotopic niches decreased initially and then increased. The contribution of inter-sexual cannibalism was the highest, and the inter-sexual overlap of the isotopic niches was lowest on September 24. Moderate inter-sexual cannibalism could reduce inter-sexual overlap of the isotopic niche and potential competition for resources. This study is the first to investigate the feed sources and intra- and inter-sexual isotopic niches of P. clarkii in rice fields without artificial diets for crayfish, with a view to providing insights for further research on the interplay between cannibalism and competition between male and female crayfish.

在一个95天的大米小龙虾中（Procambarus clarkii）培养实验，分析了饲料来源，性别内同位素生态位宽度，性别间同位素生态位重叠和潜在竞争的变化。可用于小龙虾的植物的贡献随着培养时间的延长而降低，而动物饲料来源的贡献相应地增加，而食人化饲料来源的贡献则先增加然后减少。相反，碎屑作为饲料来源的贡献开始下降，然后上升。在8月28日和9月24日，雌性小龙虾对性相食的贡献要高于性内相食，而在9月24日和10月20日，雄性小龙虾对性相食的贡献较高。试用。δ ¹⁵ N轴9月24日，然后下降，由10月20日的男性同位素利基和总人口收缩地下降，培养时间，在同一时间点占据较大同位素利基比女性，男性和的同位素利基降低比女性慢。同位素壁ches的两性交叠开始减少，然后增加。9月24日，同性相食相的贡献最大，而同位异位性之间的性交重叠最低。适度的同相相食性可以减少同位异性的相异相生和潜在的资源竞争。这项研究是第一个调查克氏疟原虫的饲料来源和性别内和性别间的生态位的研究。 在没有人工饮食的小龙虾的稻田中，以期为进一步研究食人症和雄性和雌性小龙虾之间的竞争关系提供见识。