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- W2162239729 endingPage "234" @default.
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- W2162239729 abstract "Global taxonomic richness is affected by variation in three components: within-community, or alpha, diversity, between-community, or beta, diversity; and between-region, or gamma, diversity. A data set consisting of 505 faunal lists distributed among 40 stratigraphic intervals and six environmental zones was used to investigate how variation of alpha and beta diversity influenced global diversity through the Paleozoic, and especially during the Ordovician radiations. As first shown by Bambach (1977), alpha diversity increased by 50 to 70 percent in offshore marine environments during the Ordovician and then remained essentially constant of the remainder of the Paleozoic. The increase is insufficient, however, to account for the 300 percent rise observed in global generic diversity. It is shown that beta diversity among level, soft-bottom communities also increased significantly during the early Paleozoic. This change is related to enhanced habitat selection, and presumably increased overall specialization, among diversifying taxa during the Ordovician radiations. Combined with alpha diversity, the measured change in beta diversity still accounts for only about half of the increase in global diversity. Other sources of increase are probably not related to variation in gamma diversity but rather to appearance and/or expansion of organic reefs, hardground communities, bryozoan thickets, and crinoid gardens during the Ordovician." @default.
- W2162239729 created "2016-06-24" @default.
- W2162239729 creator A5013692410 @default.
- W2162239729 date "1988-01-01" @default.
- W2162239729 modified "2023-10-16" @default.
- W2162239729 title "Alpha, beta, or gamma: where does all the diversity go?" @default.
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- W2162239729 doi "https://doi.org/10.1017/s0094837300011969" @default.
- W2162239729 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/11542147" @default.
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