Change search
ReferencesLink to record
Permanent link

Direct link
Competition in caddis larvae
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
1992 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis deals with behavioural strategies used by caddis larvae in pairwise contests and when selecting microhabitats. Effects of caddis larvae on survival and habitat selection of other insect taxa have also been studied.

The behaviours used by Arctopsyche ladogensis larvae fighting for nets, and Agrypnia pagetana larvae fighting for cases, agreed well with predictions from the sequential assessment game, which is an ESS model of animal fighting behaviour.

Establishment by net-spinning Hydropsyche siltalai larvae on artificial substrates was highest at intermediate densities of residents. Emigration/mortality was density independent, and it was higher at a poor site (low food availability) than at a rich site. Establishment was unaffected by site quality. Growth was density dependent because larvae in upstream positions reduced both current velocity and concentration of food particles for larvae in downstream positions.

A field experiment involved manipulations of the density of H. siltalai larvae and their nets in a lake outlet stream. H. siltalai larvae affected all abundant taxa, but the mechanism involved varied between taxa. Rhyacophila nubila (Trichoptera) and chironomid larvae benefited from the presence of H. siltalai nets. Negative effects on nymphs of the mayfly Ephemerella ignita were due to predation by H. siltalai larvae, while a combination of predation and increased emigration in response to nets depressed densities of Simulium truncatum blackfly larvae.

Place, publisher, year, edition, pages
Umeå: Umeå universitet , 1992. , 13 p.
Keyword [en]
Agrypnia pagetana, Arctopsyche ladogensis, emigration, fighting behaviour, habitat selection, Hydropsyche siltalai, Hydropsychidae, immigration, predation, resource competition, sequential assessment game
National Category
Ecology Zoology
URN: urn:nbn:se:umu:diva-101356ISBN: 91-7174-668-4 (korr.)OAI: diva2:799256
Public defence
1992-05-22, Hörsal B, Narutvetarhuset, Umeå universitet, Umeå, 10:00

Diss. (sammanfattning) Umeå : Umeå universitet, 1992, härtill 5 uppsatser

Available from: 2015-03-30 Created: 2015-03-27 Last updated: 2015-04-08Bibliographically approved

Open Access in DiVA

fulltext(1226 kB)46 downloads
File information
File name FULLTEXT01.pdfFile size 1226 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Englund, Göran
By organisation
Department of Ecology and Environmental Sciences

Search outside of DiVA

GoogleGoogle Scholar
Total: 46 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 44 hits
ReferencesLink to record
Permanent link

Direct link