The effects of shelter quality and prior residence on marmorkrebs (marbled crayfish)

The Journal of Experimental Biology
Kazuya TakahashiToshiki Nagayama

Abstract

Many animals fight over a limited valuable resource. In marmorkrebs (marbled crayfish), large animals usually defeat small opponents but they are frequently beaten by small opponents that are shelter owners. A prior residence effect of marbled crayfish was analysed quantitatively in the present study. More than 2 h of residency in a shelter was sufficient for small owners to defeat large intruders. Small animals that stayed in a shelter for 24 h still tended to win following removal of the shelter 10 min before pairing with large intruders, but 2 h residents were occasionally beaten by large intruders without the support of shelters during pairings. The prior residence effect thus developed depending on the duration of residency. To clarify whether the strength of the prior residence effect was affected by the quality of a shelter, large and small owners with different combinations of high- and low-quality shelters were paired. When both large and small owners possessed a high-quality shelter, the frequency of agonistic bouts was reduced. Even if agonistic bouts occurred, the win frequency of small owners was almost equal to that of large owners. Thus, the residence effect on small owners was sufficiently strong to overcome the...Continue Reading

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