Ejection of Larvae from Nests of the Paper wasp Species Polistes jokahamae (Hymenoptera: Vespidae: Polistinae)
[Hinauswurf von Larven aus Nestern der Papierwespen Art Polistes jokahamae (Hymenoptera: Vespidae: Polistinae)]
Kasuya, E; Sameshima, T; Yamamoto, K
Adult paper wasps in the temperate zone have been observed to pull out and throw away larvae from their nests during the final stage of nesting [eg: Mead & Pratt 2002 in Polistes dominulus Christ 1791]. This behavior apparently reduces the inclusive fitness of adults themselves and is non-adaptive. However, though this behavior has been referred to in some papers [eg: Mead & Pratte 2002, Matsuura 1995], no quantitative data are available, and thus the function of this behavior is an open question. Possible explanations for the behavior include (a) dead larvae are ejected, (b) parasitized larvae are ejected, (c) larvae that are unlikely to pupate and to contribute the inclusive fitness of adult wasps are ejected, (d) larvae of one sex are ejected by workers to adjust the sex ratio, and (e) male offspring of queens are ejected by workers to be replaced by males that are offspring of workers. In the present study, the first quantitative data are provided regarding the ejection of larvae, and the above hypotheses are examined for the paper wasp species Polistes jokahamae Radoszkowski 1887 (this species was formerly referred to as P jadwigae Dalla Torre 1904).