Search for dissertations about: "consumer-resource"

Showing result 1 - 5 of 7 swedish dissertations containing the word consumer-resource.

  2. 1. Effects of warming and nutrient enrichment on feeding behavior, population stability and persistence of consumers and their resources

    Author : Wojciech Uszko; Sebastian Diehl; Lennart Persson; David Vasseur; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; consumer-resource; Daphnia; functional response; nutrient enrichment; parameter estimation; persistence; plankton; predator-prey; stability; temperature; type II; type III; warming;

    Abstract : Consumer-resource interactions are the basic building blocks of every food web. In spite of being a central research theme of longstanding interest in ecology, the mechanisms governing the stability and persistence of consumer-resource interactions are still not entirely understood. READ MORE

  4. 2. Consequences of consumer-resource stoichiometric imbalance in planktonic food webs

    Author : Junwen Guo; Mehdi Cherif; Tanguy Daufresne; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; environmental science; miljövetenskap;

    Abstract : Resource imbalance between consumers and their resources can come from inadequate resource quantity or quality. The ecological stoichiometry theory focuses on understanding the consequences of imbalance in elemental composition.  In this thesis, I have used both resource quality (e.g. READ MORE

  5. 3. Top-down and bottom-up effects in a Fennoscandian tundra community

    Author : Doris Grellmann; Lars Ericson; Lauri Oksanen; Richard Inouye; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; consumer-resource interactions; exclosures; food web dynamics; grey-sided voles; lemmings; NPK-fertilization; plant defences; reindeer; soil microbes; vertebrate grazing;

    Abstract : The objective of this thesis was to investigate the effects of mammalian grazers, such as microtine rodents and reindeer, (top-down effects) and nutrient availability (bottom- up effects) on the plant community of a tundra heath.I conducted a large-scale fertilization experiment and studied the impact of grazers using exclosures. READ MORE

  6. 4. Fish life histories in a warming climate: a mechanistic basis of change and a community context

    Author : Viktor Thunell; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : Body size dependent interactions structure food webs, and these are changing with climate warming. We cannot yet predict how warming affects many aspects of life history evolution and species ecology, despite a longstanding interest in the structuring effects of temperature and body size in food webs. READ MORE

  7. 5. Using an Artificial Ecosystem to Understand Living Ecosystems

    Author : Yu Liu; David Sumpter; Philip Gerlee; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Mathematical Biology; Mathematical Modeling; Emergence; Ecosystem Evolution; Community Ecology; Mathematics with specialization in Applied Mathematics; Matematik med inriktning mot tillämpad matematik;

    Abstract : Community ecosystems at very different levels of biological organization often have similar properties. Coexistence of multiple species, cross-feeding, biodiversity and fluctuating population dynamics are just a few of the properties that arise in a range of ecological settings. READ MORE