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Kawshar, Sharmin, 2015. Fundamental and realized niches of two chrysomelid competitors on two Salix host species. Second cycle, A2E. Uppsala: SLU, Dept. of Ecology

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Abstract

The fundamental and realized niches of phytophagous insects constitute an important topic in contemporary ecology. Hutchinson (1965) formulized the concept of the fundamental and realized niche with regards to species responses to interspecific competition; and for the herbivore insects’ community the consequence of interspecific competition is a debatable and questionable from the very beginning to till now. This study investigated the fundamental and the realized niche of two willow leaf beetles, Galerucella lineola and Phratora vulgatissima, on two different Salix host species, S. viminalis and S. dasyclados; and how plant species affect the fundamental and realized niches of these beetle species. To achieve the objective of this study, I focused on the egg-laying preference and placement of Phratora and Galerucella eggs in monospecific and mixed conditions. The results indicate that the fundamental niches of both beetle species are dissimilar to each other and that plant species affect their fundamental niches. The two leaf beetles affect each other’s realized niche. One mechanism behind the results may be that the beetles induce changes in their shared host plants, leading to indirect interactions between the two beetles. Females could adjust their egg-laying behavior to different host plant species as well as to the presence of the opposite beetle species while ovipositing.

Main title:Fundamental and realized niches of two chrysomelid competitors on two Salix host species
Authors:Kawshar, Sharmin
Supervisor:Stenberg, Johan A. and Stephan, Jörg
Examiner:Björkman, Christer
Series:Självständigt arbete/Examensarbete / SLU, Institutionen för ekologi
Volume/Sequential designation:2015:2
Year of Publication:2015
Level and depth descriptor:Second cycle, A2E
Student's programme affiliation:NM004 Ecology - Master's Programme 120 HEC
Department:(NL, NJ) > Dept. of Ecology
(S) > Dept. of Ecology
Keywords:fundamental niche, realized niche, Galerucella lineola, Phratora vulgatissima, Salix viminalis, Salix dasyclados, interspecific competition, egg-laying preference, coexistence
URN:NBN:urn:nbn:se:slu:epsilon-s-4230
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-s-4230
Subjects:Plant ecology
Animal ecology
Language:English
Deposited On:27 Mar 2015 15:05
Metadata Last Modified:27 Mar 2015 15:05

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