遗传控制鸟类迁徙路径 By tracking hybrids between songbird species, investigators have found that migration routes are under genetic control and could be preventing interbreeding. The research, which is published in Ecology Letters, was conducted using geolocators that, like GPS, record the position of a bird and allow its long distance movement to be tracked. Compared with their parents, hybrids exhibited increased variability in their migratory routes: some used intermediate routes across less suitable areas, while others used the same routes as one parental group on fall migration and the other on spring migration. This is the first time we ve been able to track songbirds over the entire annual cycle, and the data we collected support a longstanding hypothesis in ecological speciation, that differences in migratory behavior could be acting as postmating reproductive isolating barriers, said lead author Kira Delmore.
2017届四川省高考英语完形填空训练(4)
2017届高考英语一轮复习基础巩固学案:Unit 4《Body language》(重大版必修4)
2017届高考英语一轮复习基础巩固学案:Challenging Yourself Ⅱ《Enjoying Sports》(重大版必修1)
2017届高考英语一轮复习基础巩固学案:Unit 3《Dreams and Dreamers》(重大版必修3)
2017届高考英语一轮复习基础巩固学案:Unit 4《Astronomy the science of the stars》(重大版必修3)
2017届高考英语一轮复习基础巩固学案:Unit 5《Art and Culture》(重大版必修3)
国际英语资讯:News Analysis: Italy still needs reforms despite EUs Junckers optimism: analysts
2017届高考英语一轮复习基础巩固学案:Challenging Yourself Ⅰ《Man and Pets》(重大版必修4)
国际英语资讯:Two claims of responsibility for Dortmund explosion found
2017届高考英语一轮复习基础巩固学案:Unit 2《Helpful Schoolmates》(重大版必修1)
国际英语资讯:Egyptian police identify Alexandrias church suicide bomber
2017届高考英语一轮复习基础巩固学案:Unit 1 Challenging Yourself Ⅰ(重大版选修8)
2017届高考英语一轮复习基础巩固学案:Unit 3 Challenging Yourself Ⅱ(重大版选修7)
2017届高考英语一轮复习基础巩固学案:Unit 5 Challenging Yourself Ⅲ(重大版选修8)
2017届高考英语一轮复习基础巩固学案:Unit 6《Poems and Poets》(重大版必修3)
2017届高考英语一轮复习基础巩固学案:Unit 4《Perseverance and Success》(重大版必修3)
国内英语资讯:China, Egypt seeks to promote Belt and Road Initiative
2017届高考英语一轮复习基础巩固学案:Unit 1《Plant World》(重大版必修4)
国际英语资讯:Spotlight: Tension seems slightly defused between Moscow, Washington following U.S. missile
国内英语资讯:Xinhua Insight: Procedures unveiled for birth of Xiongan New Area
2017届高考英语一轮复习基础巩固学案:Unit 2《Healthy eating》(重大版必修3)
2017届高考英语一轮复习基础巩固学案:Unit 5 Challenging Yourself Ⅲ(重大版选修7)
2017届高考英语一轮复习基础巩固学案:Unit 1《Women of achievement》(重大版必修4)
2017届高考英语一轮复习基础巩固学案:Unit 1《Festivals around the world》(重大版必修3)
2017届高考英语一轮复习基础巩固学案:Unit 3《A taste of English humour》(重大版必修4)
2017届高考英语一轮复习基础巩固学案:Unit 4《Historical Figures》(重大版必修5)
2017届高考英语一轮复习基础巩固学案:Challenging Yourself Ⅰ《Talking About Schools》(重大版必修1)
2017届高考英语一轮复习基础巩固学案:Challenging Yourself Ⅱ《Countries and Regions》(重大版必修4)
2017届高考英语一轮复习基础巩固学案:Unit 2《Parents and Children》(重大版必修3)
2017届高考英语一轮复习基础巩固学案:Unit 1 Challenging Yourself Ⅰ(重大版选修7)
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