英语家园

 找回密码
 注册

QQ登录

只需一步,快速开始

搜索

male or female | 气候变化致海龟“雌多雄少”?

发布者: 五毒 | 发布时间: 2022-6-23 04:00| 查看数: 54| 评论数: 0|


                               
登录/注册后可看大图


由于气候变化导致沙地温度升高,诞生的雌性海龟数量远超雄性海龟,造成种群内部“雄性干旱”现象。这种现象对海龟种群的发展构成威胁。

海龟具有所谓的温度依赖型性别决定,孵化海龟的沙子越热,诞生雌性的比率越高。“如果雌性数量达到雄性的100倍,那整个种群数量就会出现下降趋势。”

对此,澳科学家们希望采取浇灌海龟巢穴的方式,人工干预环境温度,努力扭转目前不平衡的性别比。


                               
登录/注册后可看大图


海龟音频:00:0001:18

In most species, gender is determined during fertilization. However, the sex of most turtles, alligators, and crocodiles is determined after fertilization. The temperature of the developing eggs is what decides whether the offspring will be male or female. This is called temperature-dependent sex determination, or TSD.

Research shows that if a turtle's eggs incubate below 27.7° Celsius (81.86° Fahrenheit), the turtle hatchlings will be male. If the eggs incubate above 31° Celsius (88.8° Fahrenheit), however, the hatchlings will be female. Temperatures that fluctuate between the two extremes will produce a mix of male and female baby turtles.

Researchers have also noted that the warmer the sand, the higher the ratio of female turtles. As the Earth experiences climate change, increased temperatures could result in skewed and even lethal incubation conditions, which would impact turtle species and other reptiles.

alligators 钝吻鳄 ; alligator的复数

crocodiles 鳄鱼 ; 鳄鱼皮 ; 成对纵列行进的人 ; crocodile的复数

after fertilization 受精后

incubate 孵化 ; 孵 ; 培养 ; 有潜伏 ; 潜伏

climate change 气候变化


最新评论

快速回复 返回顶部 返回列表