Preliminary report on the shell fighting behaviour of Pagurus filholi in two different climate regions in Japan

in Crustaceana
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Preliminary report on the shell fighting behaviour of Pagurus filholi in two different climate regions in Japan

in Crustaceana



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    The regional difference predicted the rapping and rotating behaviours. A, During the inserting, the attacker held the defender by the 1st and 2nd ambulatory legs and inserted chelipeds and 1st ambulatory legs into the aperture of the defender’s shell. The attacker then poked the defender. The number of rapping behaviour as a function of region is better predicted than the constant model which assumes the same mean value over the pairs from both regions. The cross dots represent predicted values for pairs including individual difference. The broken lines represent predicted values for the two regions based on the better models. B, During the rotating behaviour, the attacker held the defender’s shell with all of the ambulatory legs and slowly rotated the shell of the defender side to side. These legs were slightly moved each time the attacker rotated the defender. The number of rotating behaviour as a function of region is also better predicted than the constant model.

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    A map of Japan and the investigation sites of Pagurus filholi (De Man, 1887) populations (modified from Teikoku-Shoin). A, Kattoshi, Hokkaido (Wada et al., 2005); B, Asamushi, Aomori prefecture (present study); C, Kominato, Chiba prefecture (Imazu & Asakura, 2006); D, Shirahama, Wakayama prefecture (present study); E, Uranouchi, Kochi prefecture (Wada et al., 2005).

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