Scientists have also 11 uncovered fossils of dinosaurs that possessed feathers and other bird-like traits. These fossils provide evidence that dinosaurs were the reptiles from which birds developed. Fossils indicate that carnivorous dinosaurs called coelurosaurs (SILL-ur-oh- sorz) were like birds in...
These attempts have advanced more generalized evaluations of CES because these large sets of data cover a much greater spatial extent (though an extent cannot sometimes be specified) and reflect more of the benefit from ecosystems than those based on questionnaires, surveys, or interviews (Coscieme...
Recent evidence suggests that sexually selected traits have unexpectedly high genetic variance. In this paper, we offer a simple and general mechanism to e... L Rowe,D Houle - 《Proceedings Biological Sciences》 被引量: 3787发表: 1996年 EVOLUTION OF CONDITION‐DEPENDENT SEX ORNAMENTS AND MATING ...
a) They have lungs and a skeleton composed of cartilage. b) They have lungs and smooth skin. c) They have lungs and are ectotherms. d) They have a skeleton composed of cartilage and are ectotherms. e Which of these characteristics...
We review studies using genetic mapping and phylogenetic inferences, which can help reveal evolutionary pattern within this lability and potentially identify the changes that have occurred among different sex determination systems. We define some of the terminology, particularly where confusion arises in ...
The barbs in turn have microscopic branches called barbules that are linked together by minute hooks, making the vane of a feather a strong, flexible, and uninterrupted surface. In contrast, the barbules of down feathers do not interlock, making these feathers especially good for insulation, ...
1). We model visual aesthetic attractiveness in relation to these traits using generalized linear mixed effects models that control for the effect of sex and taxonomy. The latter is important because visual aesthetic attractiveness to humans may be higher for the more ornamented sex in sexually ...
Some animal groups, such as birds, seem prone to extreme forms of sexual selection. One contributing factor may be sex linkage of genes affecting male displays and female preferences. Here we show that sex linkage can have substantial ef... M Kirkpatrick,DW Hall - 《Evolution》 被引量: 140...
Determinants of the outcomes of these interspecific interactions are therefore of great interest. However, few large-scale comparative works have demarcated the potential behavioral and morphological traits that explain dominance between species. To delineate which traits may influence speci...
These elaborate behaviors and the striking seasonal sexual dimorphism in male widowbirds have provided researchers with an intriguing system in which to study how natural selection can shape traits of a species. Sexual selection The bright breeding coloration ...