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Immigration of olfactory searching insects into host plant patches: testing scaling rules for olfactory information
Stockholm University, Faculty of Science, Department of Botany.
Stockholm University, Faculty of Science, Department of Botany.
2011 (English)In: Arthropod-Plant Interactions, ISSN 1872-8855, E-ISSN 1872-8847, Vol. 5, 269-277 p.Article in journal (Refereed) Published
Abstract [en]

Herbivorous insects are commonly faced with host plants being distributed in scattered patches across a landscape. Immigration rates into habitat patches may strongly depend on the sensory cues used in the patch location process, and immigration rates of insects can be predicted based on the scaling of sensory cues. Here, we tested recent estimates of the scaling of olfactory information to patch size, which predicts a scaling coefficientf z = -0.5 (A^z, where A = patch size, z = scaling coefficient). We predicted that immigration rates of olfactory searching insects into patches of different sizes should scale according to the estimated slope. We investigated attraction of the weevils Cionus tuberculosus and Cionus scrophulariae to odors from figwort Scrophularia nodosa and quantified immigration rates of weevils into differently sized patches. We also investigated oviposition rates of the sawfly Tenthredo scrophulariae. The slope in the regression between density and patch size for herbivores was then compared with the predicted scaling coefficient. Using olfactometers, we found that weevils were attracted to figwort odors. Weevil densities were significantly affected by patch size, and the slope in the relationship between density and patch size was z = -0.53. The slope in the relationship between larval densities of sawflies and patch size was less negative with a slope of z = -0.15, indicating differences in search behavior compared with the weevils. The density–patch size relationship for the weevils closely matched the predicted slope and supported the previous estimations of the scaling of olfactory informationto patch size.

Place, publisher, year, edition, pages
2011. Vol. 5, 269-277 p.
National Category
Ecology Environmental Sciences
Research subject
Plant Ecology
Identifiers
URN: urn:nbn:se:su:diva-62444DOI: 10.1007/s11829-011-9148-1ISI: 000297341900002OAI: oai:DiVA.org:su-62444DiVA: diva2:441896
Note
authorCount :2Available from: 2011-09-19 Created: 2011-09-19 Last updated: 2017-12-08Bibliographically approved
In thesis
1. The importance of search behavior and movements for spatial distributions of herbivorous insects
Open this publication in new window or tab >>The importance of search behavior and movements for spatial distributions of herbivorous insects
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Insect populations commonly show large spatial variation in density, and much variation have been shown to be explained by the search behavior applied by the insect when locating habitat patches. This thesis explores the importance of odor-mediated attraction for immigration rates of herbivorous insects in relation to the size of the patches and the density of host plants within the patches. By using electroantennogram and measuring moth antennal responses to sex pheromones and thereby estimating the relative odor-mediated attraction from odor patches in field experiments (Paper I, III), I show that the length of the odor plumes emanating from the patches increase proportional with the square-root of the number of odor sources. In laboratory and field experiments (with the weevils Cionus scrophulariae and C. tuberculosus and the host plant figwort Scrophularia nodosa; Paper II) and meta-analyses on multiple insect herbivores (Paper III), I examined whether the relative increase in plume length could also predict the immigration rates of olfactory searching insects in relation to patches with increasing area and increasing density of host plants. The experiments (Paper II) and meta-analyses (Paper III) showed that the observed immigration rates of olfactory searching insects was well predicted by the relative increase in plume length, as estimated from the electroantennogram measurements (Paper I, III). The importance of immigration rates, relative to the effect of emigration and local growth was also investigated for the Cionus weevils in natural S. nodosa patches (Paper IV). This study showed that the density-patch size relationships of the weevils during early season were predicted by the net scaling of emigration and immigration rates, and differences in density-patch size relationships between the two species could be explained by inter-specific differences in their emigration rates from small patches. In conclusion, this thesis shows that search behavior can be used to predict immigration rates and spatial distributions of insects, with implications for pest control, conservation ecology and general ecological theory.

Place, publisher, year, edition, pages
Stockholm: Department of Botany, Stockholm University, 2011. 51 p.
Keyword
Olfactory search, Habitat heterogeneity, Species-traits, Immigration, Scaling relationships, Patch size, Plant-insect interactions, EAG, Odors, Pheromones
National Category
Ecology
Research subject
Plant Ecology
Identifiers
urn:nbn:se:su:diva-62464 (URN)978-91-7447-368-1 (ISBN)
Public defence
2011-10-27, föreläsningssalen, Botanicum, Lilla Frescativägen 5, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 1: Manuscript. Paper 2: Epub ahead of print. Paper 3: Submitted. Paper 4: Submitted.

Available from: 2011-10-05 Created: 2011-09-20 Last updated: 2013-08-14Bibliographically approved

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