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2015 ; 5
(18
): 4115-31
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Conspicuous male coloration impairs survival against avian predators in Aegean
wall lizards, Podarcis erhardii
#MMPMID26442582
Marshall KL
; Philpot KE
; Stevens M
Ecol Evol
2015[Sep]; 5
(18
): 4115-31
PMID26442582
show ga
Animal coloration is strikingly diverse in nature. Within-species color variation
can arise through local adaptation for camouflage, sexual dimorphism and
conspicuous sexual signals, which often have conflicting effects on survival.
Here, we tested whether color variation between two island populations of Aegean
wall lizards (Podarcis erhardii) is due to sexual dimorphism and differential
survival of individuals varying in appearance. On both islands, we measured
attack rates by wild avian predators on clay models matching the coloration of
real male and female P. erhardii from each island population, modeled to avian
predator vision. Avian predator attack rates differed among model treatments,
although only on one island. Male-colored models, which were more conspicuous
against their experimental backgrounds to avian predators, were accordingly
detected and attacked more frequently by birds than less conspicuous
female-colored models. This suggests that female coloration has evolved primarily
under selection for camouflage, whereas sexually competing males exhibit costly
conspicuous coloration. Unexpectedly, there was no difference in avian attack
frequency between local and non-local model types. This may have arisen if the
models did not resemble lizard coloration with sufficient precision, or if real
lizards behaviorally choose backgrounds that improve camouflage. Overall, these
results show that sexually dimorphic coloration can affect the risk of predator
attacks, indicating that color variation within a species can be caused by
interactions between natural and sexual selection. However, more work is needed
to determine how these findings depend on the island environment that each
population inhabits.