Search for dissertations about: "trophic level"

Showing result 11 - 15 of 66 swedish dissertations containing the words trophic level.

  2. 11. Trophic effects on the maintenance of biodiversity in the Fucus zone

    Author : Sonja Råberg; Lena Kautsky; Christer Brönmark; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Biodiversity; epiphytes; eutrophication; faunal assemblage; filamentous algae; Fucus radicans; Fucus vesiculosus; grazers; nutrient supply; Marine ecology; Marin ekologi; Plant Ecology; växtekologi;

    Abstract : Ecologically important macroalgae with large thalli and complex structures are threatened worldwide due to anthropogenic activities such as pollution. In the northern Baltic Sea the salinity is very low; the only large algae producing complex structural habitats found there are the fucoid species Fucus radicans and F. vesiculosus. READ MORE

  4. 12. Omnivore population dynamics and trophic behavior : applications for sustainable willow short rotation coppice

    Author : Anna-Sara Liman; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : Plant traits can mediate the interactions between plant feeding trophic omnivores and their herbivore prey via density effects and by altering the omnivore’s trophic behavior (plant vs. prey feeding). READ MORE

  5. 13. Regulation of CGRP expression in rat spinal motoneurons

    Author : Fredrik Piehl; Karolinska Institutet; Karolinska Institutet; []
    Keywords : immunohistochemistry; in situ hybridization; motoneuron; axotomy; peptides; CGRP; trophic factor; FGF; IGF; BDNF; CNTF; GAP-43; cell culture; plasticity; mRNAregulation; regeneration;

    Abstract : The normal distribution and lesion-induced changes in the expression of neuropeptides and growth-related proteins, with special reference to calcitonin gene-related peptide (CGRP),were studied in the motor system of the rat. In addition, factors that influence the expression of CGRP in motoneurons were identified. READ MORE

  6. 14. Food web structures and carbon transfer efficiencies in a brackish water ecosystem

    Author : Kristin Dahlgren; Ulf Båmstedt; Agneta Andersson; Marja Koski; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Carbon transfer efficiency; Food web efficiency; zooplankton; production; pelagic; benthic; fatty acids; wax esters; Marine ecology; Marin ekologi;

    Abstract : Two differently structured food webs can be distinguished in the pelagic habitat of aquatic systems; the classical one (autotrophic) with phytoplankton as a base and the microbial food web (heterotrophic) with bacteria as a base. Energy (produced at the basal trophic level) reaches higher trophic levels, i.e. READ MORE

  7. 15. Cascading extinctions in food webs : local and regional processes

    Author : Anna Eklöf; Linköpings universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Cascading extinctions; complexity; connectance; dispersal; food web; local dynamics; regional dynamics; resistance; spatial structure; species loss;

    Abstract : Ecological communities all over the world are loosing biodiversity due to different kinds of human activities and there is an urgent need of understanding how those losses affect the function of the ecosystems on which we all depend. The community's response to species losses is likely to depend on both the structure of the local community as well as its interactions with surrounding communities. READ MORE