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Do Trichoptera in running water fly upstream?
Linköping University, Department of Physics, Chemistry and Biology.
2015 (English)Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
Abstract [en]

Drift moves aquatic insects downstream, risking depopulation of upstream reaches. However, the necessity and exist-ence of an upstream flight to compensate for drift has not been undisputed. I analysed a sample of approximately 70

000 Trichoptera from a stream in northern Sweden collected during one season in 1974. The overall flight direction

was upstream. Females had a stronger upstream flight than males and species varied in both flight direction and

strength of the preference. Flight direction was not affected by wind or trap type. Upstream flight varied during the

season and with different larval behaviours. Upstream flight increased with the size of the imago and with the abun-dance in flight. A colonisation cycle might be in effect but even though upstream flight occurs, it might not be neces-sary to sustain populations in upstream reaches.

Place, publisher, year, edition, pages
2015. , 42 p.
Keyword [en]
Trichoptera, drift, colonisation cycle, upstream flight
National Category
Biological Sciences
URN: urn:nbn:se:liu:diva-130870ISRN: LiTH-IFM-G-Ex--15/3026--SEOAI: diva2:956088
Subject / course
2015-06-03, Linköpings universitet, 581 83 LINKÖPING, Linköping, 11:24 (Swedish)
Available from: 2016-10-11 Created: 2016-08-29 Last updated: 2016-10-11Bibliographically approved

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