Dinosaurprince | 2019-2-21 07:27 AM |
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現今地球物種多樣性 6,000 萬年來相若
過去,很多學者都認為,地球物種多樣性是隨地質時間,逐步增加至現在水平,因此現今所看到的生物物種,理應比遠古時代為多。不過,最新刊於《自然:生態與演化》的研究則指,陸上生物物種多樣性,僅在某些時期增有增長,但隨後數百萬年已達到平穩期,而自恐龍滅絕後不久,過去 6,000 萬年陸上生物物種數量已經非常相似。
[url]https://thestandnews.com/cosmos/%E7%8F%BE%E4%BB%8A%E5%9C%B0%E7%90%83%E7%89%A9%E7%A8%AE%E5%A4%9A%E6%A8%A3%E6%80%A7-6-000-%E8%90%AC%E5%B9%B4%E4%BE%86%E7%9B%B8%E8%8B%A5-%E5%8E%9F%E5%9B%A0-%E8%B3%87%E6%BA%90%E7%AB%B6%E7%88%AD-%E7%84%A1%E4%B8%BB%E8%A6%81%E7%89%A9%E7%A8%AE%E6%B6%88%E5%A4%B1/?fbclid=IwAR1j8lLqohgyz0xtZcQO0RUcLnmUx4jCJxIFRMQytifFe_0rwxsYrZCknl8[/url] |
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其實看化石也看到,每個時期生物都是百花齊放,近代生物不見得特別多 |
Dinosaurprince | 2019-2-23 11:54 PM |
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not necessary. actually, there is biodiversity variation through time in marine fauna and the number of families seems to increase gradually beside the mass extinction period when the biodiversity plummeted. |
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