The earlier findings have been used to partly explain the 20 per cent drop in populations of certain types of penguins near tourist sites. However, tour operators have continued to insist that their activities do not adversely affect wildlife in Antarctica, saying they encourage non-disruptive behavior in tourists, and that the decline in penguin numbers is caused by other factors.

　　Amanda Nimon of the Scott Polar Research Institute spent three southern hemisphere summers at Cuverville Island in Antarctica studying penguin behavior towards humans. “A nesting penguin will react very differently to a person rapidly and closely approaching the nest,” says Nimon. “First they exhibit large and prolonged heart rate changes and then they often flee the nest leaving it open for predators (掠夺者) to fly in and remove eggs or chicks.”　The artificial egg, specially for the project, monitored both the parent who had been ‘disturbed’ when the egg was placed in the nest and the other parent as they both took it in turns to guard the nest.

　　However, Boris Culik, who monitored the Adelie penguins, believes that Nimon’s findings do not invalidate his own research. He points out that species behave differently – and Nimon’s work was with Gentoo penguins. Nimon and her colleagues believe that Culik’s research was methodologically flawed because the monitoring of penguins’ responses needed capturing and restraining the birds and fitting them with beart-rate transmitters. Therefore, argues Nimon, it would not be surprising if they became stressed on seeing a human subsequently.

【2016届高考英语二轮复习阅读理解七十五十集之连载训练：（6）】相关文章：

★ 2017届高考英语二轮复习大题冲关秘籍完形填空之夹叙夹议文：名校模拟（含解析）

★ 贵州省贵阳市2014高考英语（新人教版）一轮阅读训练（33）附答案

★ 安徽省淮南市2014高考英语一轮单项选择及文章训练（16）及答案

★ 天津市武清区杨村第四中学2016届高考英语一轮复习语法专题十《虚拟语气》课件外研版

★ 【三维设计】2017届高考英语（江苏专用）二轮复习完形填空解题技法示范课件：2

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (25)

★ 重庆市2014高考英语阅读理解一轮（精品）训练题（7）附答案

★ 2016届高考英语二轮复习阅读理解七十五十集之连载训练：（11）

★ 2016年高考英语第一轮复习要知己知彼

★ 天津市武清区杨村第四中学2016届高考英语一轮复习语法专题五《状语从句》课件外研版