Spatial distributions and clutch sizes of Drosophila species ovipositing on cherry fruits of different stages
Spatial distributions and clutch sizes of Drosophila species ovipositing on cherry fruits of different stages
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DOI：
10.1007/s10144-006-0260-5
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发表时间：
2006-07-01
影响因子：
1.7
通讯作者：
Kimura, Masahito T.
中科院分区：
文献类型：
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作者：
Mitsui, Hideyuki;Takahashi, Kazuo H.;Kimura, Masahito T.
在聚集理论中，卵的聚集是物种共存的重要条件之一。然而，聚集的鸡蛋，离合器产卵并不总是促进共存，而聚集的产卵女性的聚集分布的鸡蛋总是有显着的贡献共存。在这项研究中，空间分布的三种果蝇在自然发生的樱桃果实进行了研究与其窝卵数。铃木果蝇主要在树上的新鲜果实上产卵，其卵在樱桃果实上随机分布。出苗数据也表明该物种的随机空间分布。本物种的随机卵分布的解释是随机访问的女性水果和生产的离合器大多是单卵。另一方面，D. lutescens和D.在落果上产卵，在羽化数据中呈聚集分布，且经常产生少量卵的窝。在这些物种中，聚集的程度通常是显着低于预期的基础上随机访问的女性水果和他们的窝卵数在本实验中观察到的，表明它们的聚集是不太可能产生的产卵女性的聚集分布。因此，这些物种的空间聚集并不一定导致它们的共存。
In the aggregation theory, aggregation of eggs is one of important conditions for the coexistence of species. However, aggregation of eggs by clutch laying does not always promote coexistence, whereas aggregation of eggs by aggregated distributions of ovipositing females always has a significant contribution to the coexistence. In this study, spatial distributions of three Drosophila species across naturally occurring cherry fruits were studied with relation to their clutch sizes. Drosophila suzukii oviposited eggs mainly on fresh fruits on trees, and its eggs were randomly distributed across cherry fruits. The emergence data also indicated random spatial distributions of this species. Random egg distributions of this species are explained by random visits of females to fruits and the production of clutches of mostly single eggs. On the other hand, D. lutescens and D. rufa oviposited on fallen fruits, showed aggregated distributions in the emergence data, and frequently produced clutches of a few eggs. In these species, the degree of aggregation was usually significantly lower than the expectation based on random visits of females to fruits and their clutch sizes observed in the present experiments, indicating that their aggregation is unlikely to arise from aggregated distributions of ovipositing females. Thus, the spatial aggregation of these species does not necessarily lead to their coexistence.