Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Ecosystem processes and biodiversity: theoretical studies and experiments with an aquatic model ecosystem
Stockholms universitet, Naturvetenskapliga fakulteten, Systemekologiska institutionen.ORCID-id: 0000-0003-1861-5030
1998 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Today, human enterprise has implications for all of nature, from the well being of the smallest organism, to the alteration of global biogeochemical cycles. To understand how major ecosystem processes are affected by environmental changes and decreasing biodiversity is crucial as many of natures services depend of such processes. In this thesis I have investigated two aspects thereof: 1) the effect of changing temperature on ecosystem structure and community metabolism, and 2) the importance of species composition and species richness for ecosystem processes. I found that different sensitivity of photosynthesis and metabolic rates based on internal energy sources to temperature will have important consequences for herbivores causing decreased herbivore biomass with increasing temperature. I also showed that the response of phytoplankton biomass to temperature might be very difficult to predict >from knowledge of species physiology since indirect effect and trophic interactions in ecosystems determine which limiting factor, e.g. predation, nutrient limitation or growth efficiency is most crucial. A result from an experiment where four different zooplankton species where grown in single culture as well as in polyculture indicated that species-specific interactions are important for ecosystem processes even within a guild of species that is assumed to be one well-defined functional group. Partial similarity between species in resource utilization explains moderated response to trophic regulation and also has implications for the relation between species richness and ecosystem functioning. The last paper makes the point that the magnitude and reliability of ecosystem process rates are closely linked to species richness and mechanisms of species invasions and extinction. A mathematical model explores the mechanisms thereof in detail.

Ort, förlag, år, upplaga, sidor
Stockholm: Department of Systems Ecology; Stockholm University , 1998. , s. 22
Nationell ämneskategori
Naturvetenskap
Forskningsämne
systemekologi
Identifikatorer
URN: urn:nbn:se:su:diva-45705ISBN: 91-7153-764-3 (tryckt)OAI: oai:DiVA.org:su-45705DiVA, id: diva2:369373
Disputation
1998-05-08, Sal G, Arrheniuslaboratorierna, Frescati, Stockholm, 09:00 (Engelska)
Opponent
Anmärkning
Härtill fem uppsatser.Tillgänglig från: 2010-11-10 Skapad: 2010-11-10 Senast uppdaterad: 2018-01-24Bibliografiskt granskad

Open Access i DiVA

Fulltext saknas i DiVA

Sök vidare i DiVA

Av författaren/redaktören
Norberg, Jon
Av organisationen
Systemekologiska institutionen
Naturvetenskap

Sök vidare utanför DiVA

GoogleGoogle Scholar

isbn
urn-nbn

Altmetricpoäng

isbn
urn-nbn
Totalt: 71 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf