| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2016: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
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| Outline of Final Research Achievements |
To study change in morphological diversity of ammonoids, I propose a method to measure amount of the morphospace occupation which is robust with respect to sampling effort. I also focus on how drastically the pattern of morphospace occupation changes between the adjacent geochronological units. I applied the present method to the analysis of change in morphological diversity of ammonoids as well as their morphological turnover rates. As the results of the analysis, a prominent decrease of morphological diversity and high rates of morphological turnover were found at the end of the Guadalupian, while the morphological event at the end of the Permian was not greater than background levels. The present results suggest that the primary replacement of dominant ammonoid form around the end of the Paleozoic occurred associated with the end-Guadalupian event eight million years before the end-Permian crisis.
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