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The Maya understood the importance of the cenotes, but they could never have known that these flooded passageways were actually the beginning of subterranean rivers, all of which eventually flow out to the sea. Salt water, unlike fresh water, does not erode limestone, so most sea caves are created by the mechanical pounding of the waves. The rocky outcrops of New Zealand' s Poor Knight Islands are riddled with sea caves and just like those in Borneo they have become important shelters for many species. After a day feeding in the open water vast shoals of demoiselle fish return to the caves, which they use as a refuge from predators. For these fish the caves are a nighttime retreat, but they' re not the only commuters in here. There are other fish working to a different schedule. |
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mǎ yǎ rén zhī dào huī yán kēng duì yú tā men de zhòng yào xìng, dàn tā men jué bú huì zhī dào, zhèi xiē shuǐ kēng shí jì shang shì yī xiē dì xià hé de qǐ diǎn, zhèi xiē dì xià hé yī zhí liú xiàng dà hǎi. xián shuǐ yǔ dàn shuǐ bù tóng, tā bú huì fǔ shí shí huī yán, suǒ yǐ hǎi shàng de jué dà bù fen yán dòng dōu shì yóu hǎi làng de jī xiè chōng jī lì xíng chéng de. xīn xī lán pǔ ěr nài cí qún dǎo de yán céng yǒu xǔ duō hǎi àn yán dòng, ér qiě hé jiā lǐ màn dān dǎo de nèi xiē yán dòng yí yàng, zhè lǐ yě shì duō zhǒng dòng wù de zhòng yào yǐn bì chǎng suǒ. zài kuān kuò de dà hǎi shàng mì shí yì tiān zhī hòu, dà qún de què diāo huí dào yán dòng zhōng xiū xī, tā men zài zhè lǐ duǒ bì shí ròu dòng wù de gōng jī. duì yú zhèi xiē yú lèi lái shuō, yán dòng shì yè wǎn xiū xī zhī suǒ, dàn tā men bìng bú shì zhè lǐ wéi yī de jìn chū zhě. zhè lǐ hái yǒu zuò xī shí jiān bù tóng de qí tā yú lèi. |