Chemosensory predator recognition in the lizardPodarcis hispanica: Effects of predation pressure relaxation

1996 ◽  
Vol 22 (1) ◽  
pp. 13-22 ◽  
Author(s):  
Raoul van Damme ◽  
Aurora M. Castilla
Keyword(s):  
Predation Pressure ◽  
Predator Recognition ◽  
Pressure Relaxation

Innate predator recognition and fright response in related populations of Oncorhynchus mykiss under different predation pressure

2007 ◽  
Vol 70 (4) ◽  
pp. 1057-1069 ◽  
Author(s):  
J. A. Scheurer ◽  
B. A. Berejikian ◽  
F. P. Thrower ◽  
E. R. Ammann ◽  
T. A. Flagg
Keyword(s):  
Oncorhynchus Mykiss ◽  
Predation Pressure ◽  
Predator Recognition ◽  
Innate Predator Recognition

scholarly journals Examining the link between relaxed predation and bird coloration on islands

2020 ◽  
Vol 16 (4) ◽  
pp. 20200002
Author(s):  
Louis Bliard ◽  
Matthieu Paquet ◽  
Aloïs Robert ◽  
Paul Dufour ◽  
Julien P. Renoult ◽  
...  
Keyword(s):  
Negative Relationship ◽  
Predation Pressure ◽  
Global Pattern ◽  
Pressure Relaxation ◽  
Island Syndrome ◽  
Insular Endemic ◽  
Insular Endemic Species ◽  
Bird Coloration ◽  
Insular Ecosystems ◽  
Phenotypic Responses

Insular ecosystems share analogous ecological conditions, leading to patterns of convergent evolution that are collectively termed as the ‘island syndrome’. In birds, part of this syndrome is a tendency for a duller plumage, possibly as a result of relaxed sexual selection. Despite this global pattern, some insular species display a more colourful plumage than their mainland relatives, but why this occurs has remained unexplained. Here, we examine the hypothesis that these cases of increased plumage coloration on islands could arise through a relaxation of predation pressure. We used comparative analyses to investigate whether average insular richness of raptors of suitable mass influences the plumage colourfulness and brightness across 110 pairs of insular endemic species and their closest mainland relatives. As predicted, we find a likely negative relationship between insular coloration and insular predation while controlling for mainland predation and coloration, suggesting that species were more likely to become more colourful as the number of insular predators decreased. By contrast, plumage brightness was not influenced by predation pressure. Relaxation from predation, together with drift, might thus be a key mechanism of species phenotypic responses to insularity.

Preliminary testing of the role of exercise and predator recognition for bonytail and razorback sucker

2007 ◽  
Author(s):  
Gordon A. Mueller ◽  
Jeanette Carpenter ◽  
Robert Krapfel ◽  
Chester Figiel
Keyword(s):  
Predator Recognition ◽  
Preliminary Testing

scholarly journals Effects of predation pressure and resource use on morphological divergence in omnivorous prey fish

2013 ◽  
Vol 13 (1) ◽  
pp. 132 ◽  
Author(s):  
Kristin Scharnweber ◽  
Kozo Watanabe ◽  
Jari Syväranta ◽  
Thomas Wanke ◽  
Michael T Monaghan ◽  
...  
Keyword(s):  
Resource Use ◽  
Predation Pressure ◽  
Morphological Divergence ◽  
Prey Fish

Postautotomy tail movement differs between colour morphs of the red-backed salamander (Plethodon cinereus)

2017 ◽  
Vol 38 (3) ◽  
pp. 395-399 ◽  
Author(s):  
Banan W. Otaibi ◽  
Quincey K. Johnson ◽  
Bradley J. Cosentino
Keyword(s):  
Natural Selection ◽  
Genetic Correlation ◽  
Behavioural Response ◽  
Plethodon Cinereus ◽  
Predation Pressure ◽  
Tail Autotomy ◽  
Tail Movement ◽  
Colour Morphs ◽  
Defensive Mechanism

Striped and unstriped colour morphs of the eastern red-backed salamander,Plethodon cinereus, vary in their pre-attack behavioural response to predators, but it is unknown whether the morphs vary in post-attack strategies. Both morphs employ tail autotomy, a post-attack defensive mechanism enabling an individual to release a portion of their tail to facilitate escape from predation. Postautotomy tail movement diverts attention of a predator away from the individual’s body, so natural selection should favor vigorous tail movement in both colour morphs ofP. cinereus. We compared the degree of postautotomy tail movement between morphs following simulated predation. Striped individuals exhibited substantially longer and faster tail movement than unstriped individuals. Divergence in postautotomy tail movement may be a direct evolved response to variable predation pressure between colour morphs. Alternatively, tail movement may be constrained in the unstriped morph due to a genetic correlation with colouration (e.g., pleiotropy).

Sign in / Sign up

Export Citation Format

Share Document