Avancerad sökning

Hittade 2 avhandlingar som matchar ovanstående sökkriterier.

1. 1. Acidification trends in Swedish lakes : an assessment of past water chemistry conditions using lake sediments

   Författare :Tom Korsman; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Palaeolimnology; acidification history; alkalization; acid deposition; land-use; lake sediments; near infrared spectroscopy; diatoms; multivariate calibration; Sweden;

   Sammanfattning : This thesis presents temporal perspectives of lake acidification in Sweden. Sediment records have been used to study timing, trends and causes of acidification, and two different techniques for assessing past lake-water acidity are presented. LÄS MER

3. 2. Fingerprints of planktivory : paleolimnological evidence of past fish community structure and dynamics

   Författare :Emma Åhlén; Marko Reinikainen; Tom Korsman; Pär Byström; Timo Kairesalo; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; planktivory; foraging efficiency; cladoceran remains; Bosmina; planktivore community capacity; PCC; Ceriodaphnia; reserrection; zooekologi; Animal Ecology;

   Sammanfattning : Planktivorous fish affect the species composition, size and morphology of their zooplankton prey by size selective predation. Remains of cladocerans are deposited in the lake sediments and this microfossil community hence reflects the historical changes in the planktivore fish community. LÄS MER