Do Trichoptera in running water fly upstream?
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...
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Linköpings universitet, Institutionen för fysik, kemi och biologi
2015
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ftlinkoepinguniv:oai:DiVA.org:liu-130870 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-130870 eng eng Linköpings universitet, Institutionen för fysik, kemi och biologi http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-130870 info:eu-repo/semantics/openAccess Trichoptera drift colonisation cycle upstream flight Student thesis info:eu-repo/semantics/bachelorThesis text 2015 ftlinkoepinguniv 2022-05-01T08:12:40Z 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. 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 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. |
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, Institutionen för fysik, kemi och biologi |
publishDate |
2015 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-130870 |
genre |
Northern Sweden |
genre_facet |
Northern Sweden |
op_relation |
http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-130870 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766146790854230016 |