考拉怎么喝水?

2020年05月13日

来源:柴老师国际教育服务

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华盛顿(路透社)-科学家解决了一个关于考拉行为的长期困扰人们的谜团,即这些生活在树上的澳大利亚原驻有袋动物如何获取足够的水来生存。

一项新研究首次描述了野生考拉的饮水行为,发现它们在降雨期间会舔食树干光滑表面上流下的雨水,而不仅仅是依靠叶子里的水分作为他们的水分来源。

研究人员说,这项发现可能对考拉的保护工作有帮助。该发现基于2006年至2019年间,主要在维多利亚州的尤扬斯地区公园,对野生考拉的46次观测。

“据称考拉在野外从不喝水,或仅偶尔喝水。它们的饮水行为通常被认为是不正常的,并被归因于疾病或严重的受热应激现象。” Mella 说。

“人们认为,考拉是从它们所取食的叶子中获得所需的大部分水分,并在雨后或叶子表面有露水时因为吃了湿叶子而无意地在野外喝水。” Mella 补充说。

考拉们每天睡眠约20个小时来保持能量,因为他们的饮食需要大量能量来消化。

Mella 说:“考拉是夜间活动的动物,所以它们只在晚上活动,而且它们是树栖动物,这意味着它们生活在树上,并依靠梳来觅食,防身,而且正如我们刚刚发现的那样,它们也靠树来获取水分。”

“实际上,考拉在树上度过了98%的生命,而它们唯一在地面上的时候,是它们在试图寻找另一棵食物供应更充足的树,或是在寻找朋友。”

WASHINGTON (Reuters) - Scientists have solved a lingering mystery about koala behavior - how these tree-dwelling marsupials native to Australia consume enough water to live.

A new study describes koala drinking behavior in the wild for the first time, finding that they lick water running down the smooth surface of tree trunks during rainfall - a phenomenon called “stemflow” - and do not rely merely on the water content of the leaves that make up their diet.

The findings, which the researchers said may be useful in koala conservation efforts, were based on 46 observations of koalas in the wild from 2006 to 2019, mostly at You Yangs Regional Park in Victoria state.

“Koalas have been alleged to never drink free water in the wild, or to drink only occasionally. Drinking behavior has often been considered unusual and attributed to disease or to severe heat stress,” Mella said.

“Koalas were thought to gain the majority of the water that they require from the moisture content in the leaves that they feed on and to drink water unintentionally in the wild by eating wet leaves after rain, or when dew is present on the leaf surface,” Mella added.

They sleep about 20 hours a day to conserve energy because their diet requires a lot of energy to digest.

“Koalas are nocturnal animals, so they are only active at night, and they are arboreal, which means that they live in trees and rely on them for food, shelter and, as we just discovered, also for drinking,” Mella said.

“Koalas actually spend 98% of their lives in trees and the only time they are on the ground is when they are trying to find another tree with a more generous food supply or a mate.”

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