Size changes of bivalves and a hypothesis about the cause of mass extinction
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- Hayami Itaru
- Department of Biology, Kanagawa University
Bibliographic Information
- Other Title
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- 二枚貝類の体サイズ変化と大量絶滅の要因に関する一仮説
- ニマイガイルイ ノ タイ サイズ ヘンカ ト タイリョウ ゼツメツ ノ ヨウイ
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Description
A number of studies concerning shell-size changes of bivalves in time and space are reviewed from an ecological viewpoint. Although various environmental factors may influence the body size of organisms, recent knowledge of deep-sea and submarine cave faunas indicates that food supply is of prime importance as a factor controlling the adult size and adaptive strategy of bivalves. Significant shell-size reduction of bivalves seems to have occurred at the same time with P/Tr and K/T mass extinctions, probably because large-sized species (or groups) were more or less selectively eliminated. I present here a hypothesis that oligotrophic conditions (especially reduction of primary production on a global scale) are responsible for these mass extinctions, even if such a condition may arise from various geologic and astronomical events.
Journal
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- Fossils
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Fossils 62 (0), 24-36, 1997
Palaeontological Society of Japan
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Details 詳細情報について
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- CRID
- 1390001204434105728
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- NII Article ID
- 110002703646
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- NII Book ID
- AN00041606
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- ISSN
- 24242632
- 00229202
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- NDL BIB ID
- 4258681
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- CiNii Articles
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- Abstract License Flag
- Disallowed