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蝾螈的交配期

Newt Sex: Buff Males! Writhing Females! Cannibalism! | Deep Look

生活意味着竞争 繁殖 死亡
Life is struggle. Sex. Death.
这是自然界中的真理 对蝾螈来说尤为如此
It’s true across nature. It’s especially true for a newt.
大多数时候 加利福尼亚州的蝾螈在森林里过着安静隐蔽的生活
Most of the time, California newts live quiet, hidden lives in the forest.
但是每个冬天——蝾螈能活20年——
But every winter – and newts can live for 20 years –
它们会体会到一股不可控的冲动 那被称为水驱
they experience an uncontrollable urge. It’s called water drive.
它们离开安全的洞穴去交配开始一场如奥德赛史诗般的危险历险
They leave the safety of their burrows to go mate. They begin a treacherous odyssey,
这是一次种群迁移 回到它们出生的池塘
a migration back to the pond in which they were born.
引发这种迁移行为的是催乳激素的作用这种激素也能促使人类母乳的分泌
It begins with a hormone called prolactin, the same one that helps women produce breast
催乳激素激发出它们变成水生动物的需要
milk. In newts, prolactin sparks a need to become aquatic.
出生地水源可能有好几英里远 比如说3英里对你和我来说那样的距离等价于36英里
Water could be miles away, like three miles. That’s the equivalent of 36 miles for you
科学家们还不能明确但一些人认为蝾螈用他们的嗅觉
and me. Scientists don’t know for sure, but some think newts use their sense of smell
来为自己引路
to help guide them.
蝾螈只有一种真实的防御方式来对抗藏在灌木丛里的蛇:用它们的皮肤
And they only have one real defense against snakes hiding in the brush: their skin. It’s
蝾螈的皮肤被毒素覆盖如果吃下一只蝾螈 其毒性足以杀死一个人
covered in a poison strong enough to kill a person… if you ate one.
蝾螈的黄眼和黄色腹部警告捕食者保持距离
Newts’ yellow eyes and belly tell predators to stay away.
但毒素也不总是足以保护它们
But poison isn’t always enough to protect them.
许多蝾螈都做不到完全靠毒素来保护自己
Many never make it.
当蝾螈向水源移动时 它们皮肤上的疙瘩消失 皮肤变得平滑
As they move toward water, newts’ skin starts to lose its bumps and becomes smooth.
长尾变得扁平 成为鳍
Their long tails flatten into fins.
它们能实现两栖的身体从陆生向水生转变 为狂热交配做好准备
Their amphibian bodies transform from terrestrial to aquatic, to prepare for a mating frenzy.
雄性蝾螈变得强壮 足底长出厚垫 用来很好地夹住雌性
The male newt bulks up, grows thick pads on its feet, perfect for clamping onto a female.
这种行为的专业名词是“抱合”拉丁语则是“拥抱” 两者是同一个意思
The word is “amplexus” – Latin for “embrace,” which is one word for it.
抱合的蝾螈能数小时或数天一直保持这种姿势
Newts can stay like this for hours, or days.
抱合的结果是:雌性蝾螈在池塘中产下蛋堆
The result: egg clusters that females lay in the pond,
蛋太多 蝾螈有时会为了补充额外的蛋白质而吃掉一些蛋
so many eggs that newts sometimes eat a few for extra protein.
存活下来的蛋会长成蝾螈幼体
The ones that survive will grow into larvae
幼体会在水里呆上数月 逐渐长成成体 到了秋天
and stay in the water for several months, transforming into adults. In the fall, they’ll
新生蝾螈就会离开池塘
leave the pond.
这之后 如果它们幸运的话 它们将会一次又一次地回到这个出生的地方
And then, if they’re lucky, they’ll come back here, again, and again, and again.
或者说至少 它们会不断试图回来
Or at least, they’ll try.

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视频概述

迁移,抱合,产卵。 除此之外还有身体的变化,从陆生到水生的转变,雄性与雌性的差异。

听录译者

收集自网络

翻译译者

云木

审核员

译学馆审核员N

视频来源

https://www.youtube.com/watch?v=5m37QR_4XNY

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