Patterns of increase of diversity indicate

Patterns of increase of diversity indicate - way: he...

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Patterns of increase of diversity indicate three evolutionary faunas : 1) Cambrian, 2) Paleozoic and 3) Modern (work of J. Sepkoski). Despite the major patterns, different taxa have very different profiles: there are examples of extinction and reradiation , maintenance of diversity and continuous diversification all spanning the same time frame (compare fig. below with other taxa: fig. 21.11 - 21.16. pp. 602-607). This suggests that if there are biological forces/pressures regulating diversity, they may be acting quite differently in different taxa. Increases in diversity were measured by Bambach in a slightly different
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Unformatted text preview: way: he classified organisms into guilds (groups of organisms with similar ways of life) and examined the increase in taxonomic diversity from the perspective of guilds. Conclusion: increase in diversity through the Phanerozoic achieved more by the increase in number of guilds rather than increasing number of species within each guild. This suggests that "ecospace" becomes more tightly packed through the Phanerozoic. Ecospace is represented by three axes and different species would "fill" different regions of the "cube" of ecospace....
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