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Invasion of Ancestral Mammals into Dim-light Environments Inferred from Adaptive
Evolution of the Phototransduction Genes
#MMPMID28425474
Wu Y
; Wang H
; Hadly EA
Sci Rep
2017[Apr]; 7
(?): 46542
PMID28425474
show ga
Nocturnality is a key evolutionary innovation of mammals that enables mammals to
occupy relatively empty nocturnal niches. Invasion of ancestral mammals into
nocturnality has long been inferred from the phylogenetic relationships of crown
Mammalia, which is primarily nocturnal, and crown Reptilia, which is primarily
diurnal, although molecular evidence for this is lacking. Here we used
phylogenetic analyses of the vision genes involved in the phototransduction
pathway to predict the diel activity patterns of ancestral mammals and reptiles.
Our results demonstrated that the common ancestor of the extant Mammalia was
dominated by positive selection for dim-light vision, supporting the predominate
nocturnality of the ancestral mammals. Further analyses showed that the
nocturnality of the ancestral mammals was probably derived from the predominate
diurnality of the ancestral amniotes, which featured strong positive selection
for bright-light vision. Like the ancestral amniotes, the common ancestor of the
extant reptiles and various taxa in Squamata, one of the main competitors of the
temporal niches of the ancestral mammals, were found to be predominate diurnality
as well. Despite this relatively apparent temporal niche partitioning between
ancestral mammals and the relevant reptiles, our results suggested partial
overlap of their temporal niches during crepuscular periods.
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