We compared aggressive behavior among four crayfish species by measuring the number and duration of agonistic acts occurring in fighting bouts between intraspecific pairs of animals. Our study included 3 congeneric species from the family Cambaridae (Orconectes rusticus, Orconectes propinquus, and Orconectes immunis) and 1 from the family Astacidae (Pacifastacus leniusculus). Based on our measurements, crayfishes differed in their level of aggressiveness and differed in the extent to which they used particular agonistic behaviors. Contrary to previous reports, O. rusticus did not appear to be especially aggressive. Of the species in our sample, O. rusticus was clearly more aggressive than only 1 species, O. immunis. Orconectes propinquus was likewise significantly more aggressive than O. immunis. Pacifastacus leniusculus (Astacidae) appeared to be the most aggressive, differing from the other 3 species in the amount of time spent fighting and in individual behaviors, especially those associated with use of antennae. Understanding species-specific differences in aggressiveness may yield insights into species replacements in natural crayfish populations, and may contribute to the value of these animals as models for investigating the neural basis of aggression.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 20 • No. 1