B
The research team has discovered that subordinate fish voluntarily diet to avoid
challenging their larger competitors. “In studying gobies we noticed that only the
largest two individuals, a male and female, had breeding (繁殖) rights within the group, ” explains Marian Wong. “All other group members are nonbreeding
females, each being 5~10% smaller than its next largest competitor. We wanted to find out how they maintain this precise size separation.”
The reason for the size difference was easy to see. Once a subordinate fish grows
to within 5~10% of the size of its larger competitor, it causes a fight which usually ends in the smaller goby being driven away from the group. More often than not,
the_evicted_fish is then eaten up.
It appeared that the smaller fish were keeping themselves small in order to avoid
challenging the boss fish. Whether they did so voluntarily, by restraining how much
they ate, was not clear. The research team decided to do an experiment. They tried to
fatten up some of the subordinate gobies to see what happened. To their surprise, the
gobies simply refused the extra food they were offered, clearly preferring to remain
small and avoid fights, over having a feast.
The discovery challenges the traditional scientific view of how boss individuals
【2017届高考英语(重庆专用)二轮精练:选修7 unit3 period 2】相关文章:
★ 贵州省贵阳市2014高考英语(新人教版)一轮阅读训练(15)附答案
★ 【课堂新坐标】2017届高考英语(通用版)二轮复习短文改错专题训练:考法2 句法错误(含解析)
★ 【三维设计】2017版(江苏专用)二轮复习练习:必修2 Unit 3《Amazing people》单元检测(含解析)
★ 【人教版】2014届高考英语一轮复习指导考点针对练:选修8 unit1《A land of diversity》
★ 2017届高考英语(重庆专用)二轮精练:选修7 unit3 period 3
★ 【北京专用】2014届高考英语一轮复习方案课时作业:必修4 Unit 1 Women of achievement
★ 【课堂新坐标】2017届高考英语(通用版)二轮复习短文改错专题训练:模式1 缺一词(含解析)
★ 2014届高考英语一轮复习课时作业(四十一)选修7Module 5《Ethnic Culture》(外研版)
★ 【三维设计】2017届高考英语(江苏专用)二轮复习阅读理解解题技法示范课件:2
★ 【浙江专用】2014届高考英语一轮复习课时作业(三十八)选修8Unit 3《Inventors and inventions》
最新
2017-04-24
2017-04-24
2017-04-24
2017-04-24
2017-04-21
2017-04-21