Do Trichoptera in running water fly upstream?
Drift moves aquatic insects downstream, risking depopulation of upstream reaches. However, the necessity and existence 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...
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Linköpings universitet, Biologi
2015
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ftlinkoepinguniv:oai:DiVA.org:liu-119828 2023-05-15T17:44:33+02:00 Do Trichoptera in running water fly upstream? Larsson, Malin 2015 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-119828 eng eng Linköpings universitet, Biologi Linköpings universitet, Tekniska fakulteten http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-119828 info:eu-repo/semantics/openAccess Trichoptera drift colonisation cycle upstream flight Student thesis info:eu-repo/semantics/bachelorThesis text 2015 ftlinkoepinguniv 2022-05-01T08:13:27Z Drift moves aquatic insects downstream, risking depopulation of upstream reaches. However, the necessity and existence 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 abundance in flight. A colonisation cycle might be in effect but even though upstream flight occurs, it might not be necessary to sustain populations in upstream reaches. Bachelor Thesis Northern Sweden LIU - Linköping University: Publications (DiVA) |
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Open Polar |
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LIU - Linköping University: Publications (DiVA) |
op_collection_id |
ftlinkoepinguniv |
language |
English |
topic |
Trichoptera drift colonisation cycle upstream flight |
spellingShingle |
Trichoptera drift colonisation cycle upstream flight Larsson, Malin Do Trichoptera in running water fly upstream? |
topic_facet |
Trichoptera drift colonisation cycle upstream flight |
description |
Drift moves aquatic insects downstream, risking depopulation of upstream reaches. However, the necessity and existence 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 abundance in flight. A colonisation cycle might be in effect but even though upstream flight occurs, it might not be necessary to sustain populations in upstream reaches. |
format |
Bachelor Thesis |
author |
Larsson, Malin |
author_facet |
Larsson, Malin |
author_sort |
Larsson, Malin |
title |
Do Trichoptera in running water fly upstream? |
title_short |
Do Trichoptera in running water fly upstream? |
title_full |
Do Trichoptera in running water fly upstream? |
title_fullStr |
Do Trichoptera in running water fly upstream? |
title_full_unstemmed |
Do Trichoptera in running water fly upstream? |
title_sort |
do trichoptera in running water fly upstream? |
publisher |
Linköpings universitet, Biologi |
publishDate |
2015 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-119828 |
genre |
Northern Sweden |
genre_facet |
Northern Sweden |
op_relation |
http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-119828 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766146791057653760 |