Social experience modifies behavioural responsiveness to a preferred vocal signal in red crossbills, Loxia curvirostra
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How fast do crossbills speciate? On assortative mating and vocalizations
The question of whether sympatric speciation (i.e. reproductive isolation of populations with overlapping distributions) is a source of biodiversity has always been controversial. So far, mounting evidence from only a few species, for example African lacustrine cichlids, African widowbirds and phytophagous insects, supports the notion that it occurs in nature. In the latter two, host shifts can...
متن کاملUnder a neighbour's influence: public information affects stress hormones and behaviour of a songbird.
Socially acquired information improves the accuracy and efficiency of environmental assessments and can increase fitness. Public information may be especially useful during unpredictable food conditions, or for species that depend on resources made less predictable by human disturbance. However, the physiological mechanisms by which direct foraging assessments and public information are integra...
متن کاملThe role of marker traits in the assortative mating within red crossbills, Loxia curvirostra complex.
We conducted mate choice experiments to determine whether differences in calls or bill morphology might influence assortative mating between call types of red crossbills (Loxia curvirostra complex) that have diverged in bill structure to specialize on different species of conifers. Females preferred males that gave calls that matched their own type, but did not prefer males that more closely ap...
متن کاملReplicated population divergence caused by localized coevolution? A test of three hypotheses in the red crossbill-lodgepole pine system.
Several lines of evidence support the hypothesis that local populations of red crossbills (Loxia curvirostra complex) enter into a predator-prey arms race with lodgepole pine (Pinus contorta latifolia) in the absence of competing pine squirrels (Tamiasciurus hudsonicus). Nevertheless, the alternative hypotheses that neutral evolution or factors other than squirrels have caused crossbill populat...
متن کاملPhotoperiod but not food restriction modulates innate immunity in an opportunistic breeder, Loxia curvirostra.
An organism's investment in immune function often varies seasonally but understanding of how fluctuations in environmental conditions directly modulate investment remains limited. This experiment investigated how changes in photoperiod and food availability affect investment in constitutive innate immunity and the acute phase response induced by lipopolysaccharide (LPS) injections in captive re...
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تاریخ انتشار 2008