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Immigration of olfactory searching insects into host plant patches: testing scaling rules for olfactory information
Stockholms universitet, Naturvetenskapliga fakulteten, Botaniska institutionen.
Stockholms universitet, Naturvetenskapliga fakulteten, Botaniska institutionen.
2011 (Engelska)Ingår i: Arthropod-Plant Interactions, ISSN 1872-8855, E-ISSN 1872-8847, Vol. 5, s. 269-277Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
2011. Vol. 5, s. 269-277
Nationell ämneskategori
Ekologi Miljövetenskap
Forskningsämne
växtekologi
Identifikatorer
URN: urn:nbn:se:su:diva-62444DOI: 10.1007/s11829-011-9148-1ISI: 000297341900002OAI: oai:DiVA.org:su-62444DiVA, id: diva2:441896
Anmärkning
authorCount :2Tillgänglig från: 2011-09-19 Skapad: 2011-09-19 Senast uppdaterad: 2017-12-08Bibliografiskt granskad
Ingår i avhandling
1. The importance of search behavior and movements for spatial distributions of herbivorous insects
Öppna denna publikation i ny flik eller fönster >>The importance of search behavior and movements for spatial distributions of herbivorous insects
2011 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Stockholm: Department of Botany, Stockholm University, 2011. s. 51
Nyckelord
Olfactory search, Habitat heterogeneity, Species-traits, Immigration, Scaling relationships, Patch size, Plant-insect interactions, EAG, Odors, Pheromones
Nationell ämneskategori
Ekologi
Forskningsämne
växtekologi
Identifikatorer
urn:nbn:se:su:diva-62464 (URN)978-91-7447-368-1 (ISBN)
Disputation
2011-10-27, föreläsningssalen, Botanicum, Lilla Frescativägen 5, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Anmärkning

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.

Tillgänglig från: 2011-10-05 Skapad: 2011-09-20 Senast uppdaterad: 2013-08-14Bibliografiskt granskad

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Andersson, PetterHambäck, Peter A.
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