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Modeling of Life History Strategies in Organisms with Indeterminate Growth, with a Focus on the Distribution and Life History of the Gumboot Chiton Cryptochiton stelleriLord, Joshua Pratt, 1986- 09 1900 (has links)
xii, 148 p. : ill. A print copy of this thesis is available through the UO Libraries. Search the library catalog for the location and call number. / The gumboot chiton Cryptochiton stelleri is the largest intertidal invertebrate
herbivore on rocky shores in the Pacific Northwest. This study documented the larval
development, metamorphosis, distribution and life history of this species. Growth
rings in valves of Cryptochiton stelleri and Katharina tunicata were used to
determine age and showed life spans of at least 40 years for C. stelleri and 17 years
for K. tunicata. Field surveys in southern Oregon showed that C. stelleri populations
are densest in small coves as a result of mortality, food availability, or larval
retention. Growth curves based on length, weight and volume were created for
several intertidal invertebrates. When incorporated into energy allocation models, length-based curves can underestimate growth and exaggerate an energetic shift from
growth to reproduction. Estimates of food intake and reproductive output showed
that continuous growth leads to higher food intake and increased fecundity in several
organisms with indeterminate growth. / Committee in Charge:
Dr. Alan L. Shanks, Chair;
Dr. Cynthia D. Trowbridge;
Dr. Richard B. Emlet
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THE MECHANICS OF FAIL-SAFE AND LOAD LIMITING MECHANISMS IN THE FEEDING APPARATUS OF A SEA MOLLUSKJohn Michael Connolly (14198420) 06 December 2022 (has links)
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<p>Many engineering structures are designed to withstand a critical mechanical load before failure. When a load greater than the critical load is encountered, the manner of structural failure is important. Nature has been a source of technical inspiration for centuries, and the power of modern scientific investigative techniques has enhanced engineers’ abilities to learn from millennia of evolutionary mechanical refinement. </p>
<p>Chitons, a family of marine mollusks, feed on algae attached to rocky substrates, and parts of their feeding organs are subjected to varied loads in the process. In this work, the manner of failure of a chiton’s tooth and supporting structure is investigated, and it is suggested that mechanical details of the structure enable load-limiting and fail-safe performance that protects the animal from potentially dangerous overloading.</p>
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Der Chiton im WandelMüller, Juliane 20 December 2024 (has links)
Bislang galt die Theorie, dass die gesamte griechische Kleidung auf einem einfachen System der Herstellung beruhe. Das heißt, ohne komplizierte handwerkliche Prozesse sowie Schneidertechniken sei es möglich, aus einer oder zwei rechteckigen Stoffbahnen verschieden aussehende Gewänder bzw. Kleidungsstücke insbesondere durch Drapierung und Hilfsmittel zu erzeugen. Dies gilt auch für das als Chiton benannte Kleid, das nur an bestimmten Stellen zusammengenäht sein soll. Bisher wurden alle als Chiton bezeichneten Kleider-Darstellungen aus höchstens zwei möglichen Grundformen hergeleitet. Ziel meiner Forschung war es herauszufinden, inwieweit die Theorie plausibel ist, dass die verschieden aussehenden Phänotypen des Chitons, die allgemein als Trageweisen und Varianten aufgefasst sind, alle aus dieser hypothetischen Grundform in so vielfältiger Weise herstellbar sind. Ebenso sollte auch die mögliche Existenz anderer Schnittkonzepte berücksichtigt und diskutiert werden. Abhängig vom Ergebnis gestaltet sich dann die Frage, ob die wiedergegebenen Kleiderformen in ein bestimmtes System eingeordnet werden können und inwieweit ihre frühere Einteilung und Benennung in der Form noch anwendbar ist. In dieser Arbeit hat sich herausgestellt, dass die abgebildeten Kleider nicht allein aus einer rechteckigen Basisform hergestellt sind und ihre Konstruktion sowie Anfertigung sich facettenreicher gestaltet als bisher angenommen. Neben abwechslungsreichen Schnittkonzepten, die auch unterschiedlich getragen werden konnten, scheinen einige sogar Kleiderkombinationen wiederzugeben, die sich aus mehreren Kleidern und einzelnen Kleidungsstücken zusammensetzen können, die aber noch im Detail erschlossen werden müssen. Aus diesen Gründen konnte die Diskussion hinsichtlich einer potenziellen Zuordnung nicht mehr als angerissen werden, denn der Versuch einer systematischen Einteilung der Kleider nach bestimmten Kriterien ist nur bedingt möglich und nicht als absolut zu betrachten. / Until now, it is assumed that ancient Greek clothing was based on a simple construction system. That means most garments were made by draping rectangular cloth panels around the body that could be closed by pins, seams, or a combination of both. For doing so, no complicated production process seems necessary, and no special tailoring techniques are needed. It also applies to the dress known as a chiton, which should be sewn together only at certain points. So far, all dress renderings identified as chitons have derived from a maximum of two possible basic patterns. My research aimed to explore if the theory is plausible that the different-looking phenotypes of Greek chiton, most commonly understood as ways of wearing and variations, can all be created from the same hypothetical basic form in various ways. Also, the potential existence of other concepts for making the represented dresses that differ in form, design, measures, and fabric structure should be discussed. Depending on the outcome, the question will be raised whether the depicted dresses can be classified into a specific system (due to construction, form, measures, etc.) and to what extent the former classification and naming are still applicable. This study has demonstrated that the dresses in the pictorial sources are not created exclusively from a rectangular shape and just one basic pattern. Moreover, not only their construction but also their making is more complex than previously assumed. They also contain a variety of construction concepts, which could also be worn in many ways. Furthermore, some dresses appear to represent dress combinations, which may consist of several dresses and single items of clothing, but this has yet to be investigated in detail. The discussion regarding a potential classification could not be more than scratched, as the attempt to systematically classify the dresses according to certain criteria is limited and cannot be seen as absolute.
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