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Activity Patterns, Behavioural Repertoires, And Agonistic Interactions Of Crayfish: A Non-Manipulative Field Study, Karen M. Davis, Robert Huber
Activity Patterns, Behavioural Repertoires, And Agonistic Interactions Of Crayfish: A Non-Manipulative Field Study, Karen M. Davis, Robert Huber
Robert Huber
Agonistic behaviour of crayfish has been studied extensively in laboratory settings where pairs or groups of individuals are allowed to interact within an experimental arena. Crayfish agonistic behaviour within its natural context, however, has received little attention to date. The present, non-manipulative field study explored activity patterns, behavioural repertoires, and agonistic encounters of rusty crayfish (Orconectes rusticus) during the summer months using continuous, 24-hour, underwater video recording at a series of representative field sites. Following the filming, crayfish within the vicinity of the camera site were captured and measured. Individual densities were high, reaching a maximum of 68 individuals/m 2 …
Gender-Selective Patterns Of Aggressive Behavior In Drosophila Melanogaster, Steven P. Nilsen, Yick-Bun Chan, Robert Huber, Edward A. Kravitz
Gender-Selective Patterns Of Aggressive Behavior In Drosophila Melanogaster, Steven P. Nilsen, Yick-Bun Chan, Robert Huber, Edward A. Kravitz
Robert Huber
Complex behaviors, such as aggression, are comprised of distinct stereospecific behavioral patterns (modules). How such patterns get wired into nervous systems remains unknown. Recently, we reported on a quantitative analysis of fighting behavior in male flies of the common Canton-S strain of Drosophila melanogaster. Here, we report a similar analysis of fighting behavior in females of the same species. Fights were carried out between pairs of virgin and pairs of mated females in competition for a yeast resource. Each fight was videotaped and analyzed by using transition matrices and Markov chain analyses. We observe only small difference in fighting intensity …
Temporal Dynamics And Communication Of Winner-Effects In The Crayfish, Orconectes Rusticus, Daniel A. Bergman, Corinne P. Kozlowski, Jeremy C. Mcintyre, Robert Huber, Alisdair G. Daws, Paul A. Moore
Temporal Dynamics And Communication Of Winner-Effects In The Crayfish, Orconectes Rusticus, Daniel A. Bergman, Corinne P. Kozlowski, Jeremy C. Mcintyre, Robert Huber, Alisdair G. Daws, Paul A. Moore
Robert Huber
A variety of factors influences the formation of hierarchical structures, and can include an altered aggressive state, an ability to physically dominate, and previous agonistic experience. Using male Orconectes rusticus, we tested the duration of the winner effect by varying the time between a winning encounter and a subsequent encounter by a 20, 40 or 60-minute interval. Varying the time between the two fights significantly altered the probabilities of initiating fight behaviour and of winning a fight. A crayfish with a 20-minute delay between its winning experience and its subsequent fight was significantly less likely to initiate fight behaviour and …
Fight Strategies Differ With Size And Allometric Growth Of Claws In Crayfish, Orconectes Rusticus, Lisa Schroeder, Robert Huber
Fight Strategies Differ With Size And Allometric Growth Of Claws In Crayfish, Orconectes Rusticus, Lisa Schroeder, Robert Huber
Robert Huber
This study examines differences in fighting strategies between small and large male crayfish, Orconectes rusticus. Due to allometric growth of claws, fighting weapons are of disproportionate size in large crayfish compared to those in smaller individuals. Presumably, such differences in the prominence of claws are reflected in differences in the likelihood of injuries, and we thus explored fighting in size-matched pairs of small or large crayfish and assessed associated strategies in situations of conflict. Although fighting reached the highest intensities in a similar proportion of instances in small and large pairs, differences in fighting strategies were evident. Small crayfish escalated …