Morphometric Approaches to Analysis of Microevolution: Morphologic Variation in Paleozoic Bryozoa
Holdener, Eric James
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https://hdl.handle.net/2142/86548
Description
Title
Morphometric Approaches to Analysis of Microevolution: Morphologic Variation in Paleozoic Bryozoa
Author(s)
Holdener, Eric James
Issue Date
1997
Doctoral Committee Chair(s)
Blake, D.B.
Department of Study
Geology
Discipline
Geology
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Paleozoology
Language
eng
Abstract
Temporal variation is recognized among stratigraphically separated populations. Colonies become more gracile through time, but populations are not ecotypes tracking favorable environmental conditions. Characters describing zooidal living chambers contribute more to the discrimination of populations through time, and shifts occur in interdependent character responses. Unidirectional temporal morphologic trends are expressed among individual characters and among all populations analyzed concurrently. These trends continue across five sampled intervals despite fluctuating environmental conditions.
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