先カンブリア時代末期から古生代カンブリア紀にかけての地球環境の変化と海産無脊椎動物の進化について

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書誌事項

タイトル別名
  • Environmental Changes and Evolution of Marine Invertebrates from the Late Precambrian to the Cambrian

説明

The rapid appearance of skeletons in various marine invertebrates in the beginning of the Cambrian produced the sudden explosive increase of the animal fossils. This dramatic evolutionary event was not performed by the explosive diversification of marine life but simply by the physiological changes of the organisms in increasing oxygen pressure in the earth's atmosphere. According to the recent physiological studies, various marine animals can survive in low dissolved oxygen conditions of rather long period with an anaerobic metabolism, suggesting the respiratory mechanisms of the primitive forms in the Precambrian. The anaerobic metabolic activities imposed some physiological restrictions on the animals through the acidic end-products (eg, inhibition of skeleton formation, small body size, and low metabolic efficiency etc.). The skeleton formation in the Cambrian life was initiated by the advent of aerobic metabolism, which indicated the release from the physiological restrictions by the anaerobic metabolism.

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