Effects of resource availability,predators, conspecifics and heterospecifics on decorating behaviour by the majid crab <Emphasis Type="Italic">Tiarinia cornigera</Emphasis> |
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Authors: | Phan?Due?Thanh Email author" target="_blank">Keiji?WadaEmail author Michiko?Sato Yoshihisa?Shirayama |
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Institution: | (1) Department of Biological Science, Faculty of Science, Nara Women’s University, Nara 630-8506, Japan;(2) Seto Marine Biological Laboratory, Kyoto University, Shirahama Wakayama, 649-2211, Japan |
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Abstract: | Utilization of algae for decorating by the intertidal majid crab Tiarinia cornigera was examined by laboratory experiments in relation to availability of algae, presence of a predator, and the presence of
conspecific and heterospecific crabs. Different availabilities of decorating materials had a positive correlation on decorating
amount by juveniles, while the correlation was not so clear in subadults. The amount of decorating decreased with increasing
density of conspecific crabs in the presence of a predator, but there was so clear relationship in the absence of a predator.
The decrease in decorating under high density could be due to intraspecific aggression, because the superior crab, in fighting,
was found to be decorated with more algae. Tiarinia cornigera was found to be superior to the co-occurring different majid species Micippa platipes in fighting. When T. cornigera and M. platipes were housed together, the former was decorated with more algae than the latter in the presence of a predator, but in the
absence of a predator, the amount of algae was not different. Thus, presence of a predator may motivate intraspecific competition
in T. cornigera as well as interspecific competition between T. cornigera and M. platipes for decorating materials. |
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