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What shapes local density?: The importance of migration rates and local growth for density-patch size relationships in two Cionus weevils
Stockholm University, Faculty of Science, Department of Botany.
Stockholm University, Faculty of Science, Department of Botany.
2012 (English)In: Ecological Entomology, ISSN 0307-6946, E-ISSN 1365-2311, Vol. 37, no 1, 90-98 p.Article in journal (Refereed) Published
Abstract [en]

1. The relative effect of migration and local growth on the spatio-temporal density-distribution of two co-existing herbivorous weevils, Cionus scrophulariae L. and C. tuberculosus Scop., in 32 host plant Scrophularia nodosa L. patches of varying sizes was investigated. 2. Predictions of the temporal development of the slope in the density-patch size relationships were derived from a basic population model with scale-dependent migration rates. The model indicated that the slopes in the density-patch size relationships during the early season should be reflected by the net scaling of immigration and emigration rates, whereas the slopes during the later season should increase as a result of local growth. 3. Emigration rates of the weevils were estimated in a field experiment, were the weevils coexisted in space and time. These results were then combined with a previous estimate of immigration rates in order to determine the net scaling of migration rates. 4. The emigration rate differed between species, caused by different movement rates in small patches, which could explain differences in the general slope of the density-patch size relationships of the weevils in the natural figwort patches throughout the summer. The slopes in the relationships in the early season were largely predicted by the net scaling of migration rates. The slope also increased in the later season for C. tuberculosus, whereas the slope decreased for C. scrophulariae. 5. It was concluded that the understanding of both inter- and intra-specific variations in density-patch size relationships of insect herbivores can be improved using population models incorporating scale-dependent migration and local growth.

Place, publisher, year, edition, pages
2012. Vol. 37, no 1, 90-98 p.
Keyword [en]
Cionus scrophulariae, Cionus tuberculosus, emigration, herbivores, immigration, patch size, scaling relationships, Scrophularia nodosa
National Category
Botany
Identifiers
URN: urn:nbn:se:su:diva-76311DOI: 10.1111/j.1365-2311.2011.01339.xISI: 000299253000011OAI: oai:DiVA.org:su-76311DiVA: diva2:526913
Note
2Available from: 2012-05-15 Created: 2012-05-10 Last updated: 2017-12-07Bibliographically 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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