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Functional adaptation of spiriferide brachiopod morphology
1Department of Geology, National Museum of Nature and Science, Hyakunincho, Shinjuku, Tokyo 169-0073, Japan. y-shiino@kahaku.go.jp
Journal of Evolutionary Biology
|May 25, 2010
Summary
Devonian brachiopods evolved unique shell shapes, like the sulcus, to optimize feeding currents in flowing water. This adaptation facilitated diverse feeding strategies and diversification in spiriferide brachiopods.
Area of Science:
- Paleontology
- Evolutionary Biology
- Fluid Dynamics
Background:
- Spiriferide brachiopod morphologies are thought to be adaptations to diverse environmental conditions.
- Understanding the functionalization of these ancient marine invertebrates is key to evolutionary studies.
Purpose of the Study:
- To investigate the optimization of the Devonian spiriferide brachiopod Paraspirifer bownockeri for lotic (flowing water) conditions.
- To analyze how shell morphology, specifically the sulcus, influences passive feeding flows.
Main Methods:
- Utilized computational fluid dynamics (CFD) simulations.
- Employed four distinct models of the Paraspirifer bownockeri shell, varying sulcus development.
- Analyzed flow patterns generated by each model to assess feeding efficiency.
Main Results:
- Deeper sulci were found to generate stronger spiral flows, crucial for directing food particles to the feeding organs.
- Only the model mimicking the natural shell form produced stable, slow inflow areas suitable for efficient feeding.
- A morphological trade-off exists between sulcus development and wing form in the fossil record.
Conclusions:
- Spiriferide shell morphology, particularly the sulcus and wing form combination, evolved to support diverse feeding strategies.
- These adaptations likely contributed to the significant diversification observed within spiriferide brachiopods.
- The study highlights the role of fluid dynamics in the evolution of fossil marine invertebrates.
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