The recent establishment of a small passerine bird, the Dark-eyed Junco, Junco hyemalis, in an urban environment provides a model system in which to examine in depth the initial stages ofpopulation adaptation to an urban environment. 展开 ...
【机战】盖修班斯特 幽灵系列进化史 | Evolution of GESPENST (SRW) | 1992-2019 12:38 【机器战OG】 | 古伦加斯特系列进化史| GRUNGUST系列进化 SRW 20:28 机战GETTER CHANGE ATTACK 进化史(2002-2017) 21:56 高达各种机体进化史 尺寸对比 part 2 06:28 高达各种机体进化史 尺寸对比 part 1 15:12...
Hamilton and Zuk (1982) suggested that secondary sexual characters evolve because they allow females to assess a potential mate's ability to resist parasites. A prediction of this theory is that the degree of elaboration of secondary sexual characters should be positively correlated with parasite load...
The findings challenge the widely-held belief that the dinosaurian extinction was followed by a rapid evolution of bird species. Previous studies indicated that the catastrophe resulted in the elimination of birds' competition for resources, thereby facilitating their fast diversification into the 11,000...
include other genes without sex-determining functions2. Genetic evidence supporting the involvement of two genes has been found in plants includingSilene latifolia, asparagus and kiwifruit4,12. Alternatively, the two mutations can lead to dioecy with a single sex determining gene (‘one-factor’ ...
thebabygamebird?DESIGNAPROJECT 1.TheprocedureofprojectSubject:Location:Setting:Setup：Specialcondition：ACCIDENTALDISCOVERY 1.WhatdidKen’ssonfind?2.Whatdidthisdiscoverymean?ASERIESOFINGENIOUSEXPERIMENTS 1.Whatistheprogressofexperiment2.Whatdidtheyfindinthisingeniousexperiment?3.HowdidKenexplainhisfindingtoreaders...
Overall, our analyses indicate that by improving the taxonomic sampling, complete mt genomes can solve the evolutionary relationships among major bird groups. Second, we used our phylogenetic hypotheses to estimate the time of origin of major avian orders as a way to test if their diversification ...
The evolution of sexual selection is studied using a two-locus model of a polygynous population that follows both a male trait causing loss of viability an... M Kirkpatrick - 《Evolution》 被引量: 2386发表: 1982年 Female choice selects for extreme tail length in a widowbird Darwin's 1 hy...
Furthermore, different detectability of the sexes, a potential confound of field estimates of ASR19, is not likely to bias our results: the more polygamous sex is expected to be more conspicuous because of elaborate plumage, displays and general activity2, which would potentially bias ASR estima...
Fossil bird skeletons discovered in Lower Cretaceous lake deposits in China shed new light on the early evolution of avian flight and perching. The 135 million-year-old sparrow-sized skeletons represent a new avian, Sinornis santensis, n. gen. n. sp., that preserves striking primitive features...