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Unformatted text preview: dust, the bivalves (e.g., clams) diversify extensively. The patterns look like what one might expect from competitive exclusion , and is referred to as ecological replacement since one group with a similar set of key innovations replaces another group (see figure below). Re analysis of the brachiopod/bivalve replacement has suggested that there has been no interaction between the "competing" forms and that they are best though of as "ships that pass in the night". This does not mean that all ecological replacements in the fossil record do not involve competition, just that it is hard to say. A nice way to compare the possibility of interaction, or the lack of it, is illustrated in figure 21.12, pg. 603....
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- Fall '10