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Invertebrates dominate these upper reaches. The hellgrammite, its body flattened to reduce drag, has bushy gills to extract oxygen from the current. Black fly larvae anchor themselves with the ring of hooks, but if these become unstuck, they' re still held by a silken safety line. There are advantages to life in the fast stream bamboo shrimps can just sit and sift out passing particles with their fanlike forearms. Usually, these mountain streams only provide enough food for small animals to survive. But with the spring melt here in Japan monsters stir in their dens. Giant salamanders, world' s largest amphibian, almost two metres long. They' re the only large predator in these icy waters. They begin their hunt at night. These salamanders have an exceptionally slow metabolism. Living up to 80 years they grow into giants. |
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zhè lǐ yǐ wú jǐ zhuī dòng wù wéi zhǔ, jiǎo yú líng shēn tǐ biǎn píng, zhè yàng kě yǐ jiǎn shǎo shuǐ de chōng lì, tā hái zhǎng yǒu guàn mù yí yàng de sāi, biàn yú xī shōu shuǐ liú zhōng de yǎng qì. ruì yíng yòu chóng píng jiè fù zhī shàng de gōu huán bǎ zì jǐ máo dìng zài shuǐ lǐ. jí shǐ zhè yàng jiān chí bú zhù, tā men hái yǒu xiàng sī yí yàng de ān quán dài. zài jí liú zhōng shēng huó zì yǒu tā de hǎo chù. zhú jié xiā zhǐ xū děng zài nà li, yòng tā shàn zi yí yàng de qián bì guò lǜ nèi xiē lù guò zhě. tōng cháng shān jiān xī liú lǐ de shí wù zhǐ néng gōng xiǎo dòng wù shēng cún, dàn zài rì běn de zhè yī dì qū, chūn tiān róng huà le bīng xuě, dòng xué lǐ de nèi xiē dà dòng wù chǔn chǔn yù dòng le. zhè shì yǐn sāi ní, tā men shì shì jiè shang zuì dà de liǎng qī dòng wù, shēn cháng dá liǎng mǐ. tā men shì zhè piàn bīng lěng shuǐ yù zhōng wéi yī de dà xíng shí ròu dòng wù. tā men tōng cháng wǎn shàng chū lái mì shí. tā men de shòu mìng kě dá 80 nián, shēn tǐ cháng de hěn dà. |