Sökning: "Trophic interactions"

Visar resultat 36 - 40 av 89 avhandlingar innehållade orden Trophic interactions.

  1. 36. Copepods in Skeletonema-dominated food webs : Toxicity and nutritional quality as factors controlling copepod-diatom interactions

    Författare :Roswati Md Amin; Ulf Båmstedt; Sigrun Jónasdóttir; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Copepod-diatom interaction; toxicity; nutritional quality; Skeletonema;

    Sammanfattning : My thesis focuses on copepod-diatom interactions, specifically on the effects of food quality and toxicity on copepod feeding, reproductive success and behavior but as a frame, also includes a quantitative evaluation of copepod carbon requirements compared to other trophic plankton groups. My aim was to evaluate the function of copepods in diatom-dominated spring blooms. LÄS MER

  3. 37. The effect of temperature on trophic interactions : Implications for the population dynamics of a forest pest insect in a warmer climate

    Författare :Ida Kollberg; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Increase in temperature related to climate change will have consequences on the performance of organisms. Insects could be expected to respond more than other organism groups because they are ectotherms. LÄS MER

  4. 38. Species interactions in streams - effects of predation, competition and ecosystem properties

    Författare :Erika Nilsson; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; behaviour; species abundance; stable isotopes; habitat complexity; niche width; niche overlap; competition; streams; predation;

    Sammanfattning : Stream ecosystems are dynamic and they have an inherent environmental variability. Organisms that live in streams are adapted to the continuously changing environment and the presence or absence of species are determined by their environmental requirements, while abundance is most often affected by interactions, such as competition and predation, with other species that are found in the same habitat. LÄS MER

  5. 39. Cell-matrix interactions in neuronal regeneration : focus on integrins and laminins

    Författare :Stefan Plantman; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : The central and peripheral nervous system (CNS and PNS, respectively) differ in their ability to regenerate after injury. This difference has been attributed both to intrinsic differences in the properties of the neurons and to the extracellular environment. LÄS MER

  7. 40. The influence of trophic polymorphisms on habitat coupling in aquatic food webs

    Författare :Maria H. K. Marklund; Peter Eklöv; R. Svanbäck; Pierre Magnan; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biology with specialization in Limnology; Biologi med inriktning mot limnologi;

    Sammanfattning : Trophic cascades, together with other indirect interactions are important aspects in shaping the composition and abundance of species in the food web. Theoretically, movement of energy between systems, and coupling between habitats by mobile predators have been suggested as being important for food web stability and evenness. LÄS MER