Search for dissertations about: "Heterandria formosa"

Found 3 swedish dissertations containing the words Heterandria formosa.

  2. 1. Alternative Stable States in Size-Structured Communities : Patterns, Processes, and Mechanisms

    Author : Arne Schröder; Lennart Persson; André M. de Roos; Tim Benton; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; biomass overcompensation; Chaoborus; emergent Allee effect; Heterandria formosa; juvenile recruitment bottlenecks; ontogenetic niche shifts; Poecilia reticulata; Biology; Biologi;

    Abstract : Alternative stable states have been, based on theoretical findings, predicted to be common in ecological systems. Empirical data from a number of laboratory and natural studies strongly suggest that alternative stable states also occur in real populations, communities and ecosystems. READ MORE

  4. 2. Ontogenetic bottlenecks : effects on intraguild predation systems and ecosystem efficiency

    Author : Birte Reichstein; Lennart Persson; André M. De Roos; Priyanga Amarasekare; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; mixed interactions; cannibalism; life-history omnivory; ontogenetic niche shift; biomass overcompensation; biomass production; ontogenetic asymmetry; indirect effects; biology; biologi; zooekologi; Animal Ecology;

    Abstract : Size-dependent differences between individuals in size-structured organisms have fundamental effect on population and community dynamics. Intraguild predation (IGP) is one specifically interesting constellation that often arises when two size-structured populations interact. READ MORE

  5. 3. Effects of size-dependent predation and competition on population and community dynamics

    Author : Karin Nilsson; Lennart Persson; Volker Rudolf; Umeå universitet; []
    Keywords : size-structure; cannibalism; resource competition; predation; emergent facilitation; population regulation; population dynamics; overcompensation; density-dependence; cycles; zooekologi; Animal Ecology;

    Abstract : Most animals grow substantially during their lifetime and change in competitive ability, predatory capacity and their susceptibility to predation as they grow. This thesis addresses the implications of this on regulation and dynamics within populations as well as between population interactions. READ MORE