Response time of an avian prey to a simulated hawk attack is slower in darker conditions, but is independent of hawk colour morph

To avoid predation, many species rely on vision to detect predators and initiate an escape response.The ability to detect predators may be lower in darker light conditions or with darker backgrounds.For birds, however, this has never been experimentally tested.We test the hypothesis that the response time of avian prey (feral pigeon Columbia livia

read more

Reduced steroid activation of elephant shark GR and MR after inserting four amino acids from the DNA-binding domain of lamprey corticoid receptor-1

Atlantic sea lamprey contains two corticoid receptors (CRs), CR1 and CR2, that have identical amino acid sequences, except for a four amino acid insert (Thr-Arg-Gln-Gly) in the CR1 DNA-binding domain (DBD).Steroids are stronger transcriptional activators of CR2 than of CR1 suggesting that the insert reduces the transcriptional response of lamprey C

read more