Ohbayashi-Hodoki, Kako; Ishihama, Fumiko; Shimada, Masakazu - In: Behavioral Ecology 15 (2004) 6, pp. 976-981
We examined whether gender role in the simultaneous hermaphrodite freshwater snail, Physa acuta, is determined by relative body size in a manner predicted by the size-advantage model. We observed the body-size combinations of pairs in the laboratory by using field-collected populations. Smaller...