| Walking versus breathing: mechanical differentiation of sea urchin podia corresponds to functional specialization. | |
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MedLine Citation:
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PMID: 10707816 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The podia of sea urchins function in locomotion, adhesion, feeding, and respiration; but different podia on a single urchin are often specialized to one or more of these tasks. We examined the morphology and material properties of podia of the green sea urchin, Strongylocentrotus droebachiensis, to determine whether, despite apparent similarities, they achieve functional specialization along the oral-aboral axis through the differentiation of distinct mechanical properties. We found that oral podia, which are used primarily for locomotion and adhesion, are stronger and thicker than aboral podia, which are used primarily for capturing drift material and as a respiratory surface. The functional role of ambital podia is more ambiguous; however, they are longer and are extended at a lower strain rate than other podial types. They are also stronger and stiffer than aboral podia. In addition, all podia become stronger and stiffer when extended at faster strain rates, in some cases by nearly an order of magnitude for an order of magnitude change in strain rate. This strain-rate dependence implies that resistance to rapid loading such as that imposed by waves is high compared to resistance to slower, self-imposed loads. Thus, the serially arranged podia of S. droebachiensis are functionally specialized along an oral-aboral axis by differences in their morphology and mechanical properties. |
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Authors:
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H A Leddy; A S Johnson |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: The Biological bulletin Volume: 198 ISSN: 0006-3185 ISO Abbreviation: Biol. Bull. Publication Date: 2000 Feb |
Date Detail:
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Created Date: 2000-04-19 Completed Date: 2000-04-19 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 2984727R Medline TA: Biol Bull Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 88-93 Citation Subset: IM; S |
Affiliation:
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Biology Department, Bowdoin College, Brunswick, Maine 04011, USA. hal2@acpub.duke.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Sea Urchins / anatomy & histology, physiology* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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