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Temporal changes in the environmental conditions upon which life depend are ubiquitous in nature, acting at every level of organisation from cells to ecosystems. Although the actions themselves are often poorly understood, they strongly depend on the temporal and hierarchical (organisational) scales at which they are measured; ecosystems are relatively stable through time while their species composition may undergo vast changes. Likewise any hierarchical level may be relatively stable in the short-term, but undergo vast long-term changes. This thesis aims to better understand the importance of these scales for mediating the impact of environmental variability on ecological systems. / The approach used herein employs both mathematical models and empirical data which represent food webs responding to environmental variability at different hierarchical scales. Within each of these representative food webs, the influence of environmental variability on the stability of the food web is determined using an approach which accounts for the effects of temporal scale. This thesis demonstrates that the stability of simple model food webs (high hierarchical scale) is tightly linked to environmental variability and the temporal scales at which these changes occur dictate which species in the model are most affected. At lower scales of organisation, empirical data indicate that environmental variability generally has a lesser impact on stability and that only certain temporal scales are responsible for this trend. At these temporal scales some species respond differently to environmental variability, negative changes in one species (or group) are offset by positive changes in another - a process known as compensation. These results highlight the importance of both temporal and hierarchical scale in mediating the response of food webs to environmental variability. Ultimately, they will serve to better understand how models and experiments should scale-up from low to high hierarchical and temporal scales.

Texte remanié de: Habilitationsschrift--Philosophische Fakultät--Universität Freiburg im Breisgau, 1988. / Bibliogr. p. 443-482. Index.

Thesis (M.A.)--York University, 1997. Graduate Programme in Geography. / Typescript. Includes bibliographical references (leaves 182-185). Also available on the Internet. MODE OF ACCESS via web browser by entering the following URL:http://wwwlib.umi.com/cr/yorku/fullcit?pMQ27340.

Diss.--Katholisch-Theologische Fakultät--Universität Tübingen, 1985. / Contient en annexe des documents tirés des archives diocésaines de Constance.

Texte remanié de: Diss.--Philosophische Fakultät IV, Freiburg i. Br.--Albert-Ludwigs-Universität. Titre de soutenance : Die Bischöfe von Konstanz aus dem Hause Tanne-Waldburg, 1233-1274.

Bern, Rer. pol. Diss.

Constance de Salm (1767-1845) is an unknown French woman author who nevertheless enjoyed much success in her time. The French Revolution of 1789 and the disappointments that it brought in regards to woman's rights incited her to also use her writings to forward women's cause. / In this work, we will first introduce this "illustrious unknown writer" through a biography relating the important periods of her life while also drawing a parallel with the literature she wrote during her career. We will then go over those "feminist" writings in order to focus on the major themes.

Thesis (Ph. D.)--Ohio State University, 2007. / Title from first page of PDF file. Includes bibliographical references (p. 325-349).

Thesis (Ph. D.)--Carleton University, 2004. / Includes bibliographical references (p. 503-530). Also available in electronic format on the Internet.