Pagurus filholi (De Man, 1887) is one of the common hermit crabs in the rocky intertidal areas in Japan with broad geographical distribution across the area influenced by the warm Kuroshio current arising from tropical Southeast Asia and the cold Oyashio current flowing from the Bering Sea (fig. A1 in the Appendix). The reproductive season of P. filholi is mainly in winter in the Kuroshio area but in summer in the Oyashio area (Imazu & Asakura, 1994; Wada et al., 2005), and hermits in the Kuroshio area prefer heavier shells than hermits in the Oyashio area (Hasegawa et al., 2011). Hermit crabs conduct shell fight, a highly ritualized combat for shell exchange without causing direct damage to other hermits (Hazlett, 1996). Here, we compare the behaviour of P. filholi in the Kuroshio and Oyashio regions and examine whether there are any qualitative and quantitative differences in the behavioural patterns between the hermit crabs in the areas influenced by the two different ocean currents.The observation in the Kuroshio region was made at Shirahama, Wakayama prefecture (135°33′N 33°69′E) (fig. A1, D) in August, and observation in Oyashio region was made at Asamushi, Aomori Prefecture (140°9′N 40°90′E) (fig. A1, B) in September.
Crustaceana – Brill
Published: Nov 10, 2017
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