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Aposematic Signal Variation Predicts Male-Male Interactions In A Polymorphic Poison Frog, Laura Crothers, Eben Gering, Molly Cummings
Aposematic Signal Variation Predicts Male-Male Interactions In A Polymorphic Poison Frog, Laura Crothers, Eben Gering, Molly Cummings
Eben Gering
Many species use conspicuous “aposematic” signals to communicate unpalatability/unprofitability to potential predators. Although aposematic traits are generally considered to be classic examples of evolution by natural selection, they can also function in the context of sexual selection, and therefore comprise exceptional systems for understanding how conspicuous signals evolve under multifarious selection. We used males from a highly territorial poison frog species in a dichotomous choice behavioral test to conduct the first examination of how aposematic signal variation influences male–male interactions. Our results reveal two behavioral patterns: (1) male dorsal brightness influences the behaviors of male conspecifics such that males approach …
Customary Constraints On The Use Of Force: Article 51 With An American Accent, William C. Banks, Evan J. Criddle
Customary Constraints On The Use Of Force: Article 51 With An American Accent, William C. Banks, Evan J. Criddle
Evan J. Criddle
This article, prepared for the symposium on ‘The Future of Restrictivist Scholarship on the Use of Force’, examines the current trajectory of restrictivist scholarship in the United States. In contrast to their counterparts in continental Europe, American restrictivists tend to devote less energy to defending narrow constructions of theUNCharter. Instead, they generally focus on legal constraints outside the Charter’s text, including customary norms and general principles of law such as necessity, proportionality, deliberative rationality, and robust evidentiary burdens. The article considers how these features of the American restrictivist tradition reflect distinctive characteristics of American legal culture, and it explores the …
Dominance And Leadership: Useful Concepts In Human-Horse Interactions?, Elke Hartmann, Janne W. Christensen, Paul Mcgreevy
Dominance And Leadership: Useful Concepts In Human-Horse Interactions?, Elke Hartmann, Janne W. Christensen, Paul Mcgreevy
Paul McGreevy, PhD
Dominance hierarchies in horses primarily influence priority access to limited resources of any kind, resulting in predictable contest outcomes that potentially minimize aggressive encounters and associated risk of injury. Levels of aggression in group-kept horses under domestic conditions have been reported to be higher than in their feral counterparts but can often be attributed to suboptimal management. Horse owners often express concerns about the risk of injuries occurring in group-kept horses, but these concerns have not been substantiated by empirical investigations. What has not yet been sufficiently addressed are human safety aspects related to approaching and handling group-kept horses. Given …
Orca Behavior And Subsequent Aggression Associated With Oceanarium Confinement, Robert Anderson, Robyn Waayers, Andrew Knight
Orca Behavior And Subsequent Aggression Associated With Oceanarium Confinement, Robert Anderson, Robyn Waayers, Andrew Knight
Andrew Knight, Ph.D.
Based on neuroanatomical indices such as brain size and encephalization quotient, orcas are among the most intelligent animals on Earth. They display a range of complex behaviors indicative of social intelligence, but these are difficult to study in the open ocean where protective laws may apply, or in captivity, where access is constrained for commercial and safety reasons. From 1979 to 1980, however, we were able to interact with juvenile orcas in an unstructured way at San Diego’s SeaWorld facility. We observed in the animals what appeared to be pranks, tests of trust, limited use of tactical deception, emotional self-control, …
Orca Behavior And Subsequent Aggression Associated With Oceanarium Confinement, Robert Anderson, Robyn Waayers, Andrew Knight
Orca Behavior And Subsequent Aggression Associated With Oceanarium Confinement, Robert Anderson, Robyn Waayers, Andrew Knight
Andrew Knight, PhD
Based on neuroanatomical indices such as brain size and encephalization quotient, orcas are among the most intelligent animals on Earth. They display a range of complex behaviors indicative of social intelligence, but these are difficult to study in the open ocean where protective laws may apply, or in captivity, where access is constrained for commercial and safety reasons. From 1979 to 1980, however, we were able to interact with juvenile orcas in an unstructured way at San Diego’s SeaWorld facility. We observed in the animals what appeared to be pranks, tests of trust, limited use of tactical deception, emotional self-control, …