Effect of vegetation density, height, and connectivity on the oviposition pattern of the leaf beetle Galeruca tanaceti
Vegetation structure can profoundly influence patterns of abundance, distribution, and reproduction of herbivorous insects and their susceptibility to natural enemies. The three main structural traits of herbaceous vegetation are density, height, and connectivity. This study determined the herbivore...
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description | Vegetation structure can profoundly influence patterns of abundance, distribution, and reproduction of herbivorous insects and their susceptibility to natural enemies. The three main structural traits of herbaceous vegetation are density, height, and connectivity. This study determined the herbivore response to each of these three parameters by analysing oviposition patterns in the field and studying the underlying mechanisms in laboratory bioassays. The generalist leaf beetle, Galeruca tanaceti L. (Coleoptera: Chrysomelidae), preferentially deposits its egg clutches on non-host plants such as grasses. Earlier studies revealed that oviposition within structurally complex vegetation reduces the risk of egg parasitism. Consequently, leaf beetle females should prefer patches with dense, tall, or connected vegetation for oviposition in order to increase their reproductive success. In the present study, we tested the following three hypotheses on the effect of stem density, height, and connectivity on oviposition: (1) Within habitats, the number of egg clutches in areas with high stem densities is disproportionately higher than in low-density areas. The number of egg clutches on (2) tall stems or (3) in vegetation with high connectivity is higher than expected for a random distribution. In the field, stem density and height were positively correlated with egg clutch presence. Moreover, a disproportionately high presence of egg clutches was determined in patches with high stem densities. Stem height had a positive influence on oviposition, also in a laboratory two-choice bioassay, whereas stem density and connectivity did not affect oviposition preferences in the laboratory. Therefore, stem height and, potentially, density, but not connectivity, seem to trigger oviposition site selection of the herbivore. This study made evident that certain, but not all traits of the vegetation structure can impose a strong influence on oviposition patterns of herbivorous insects. The results were finally compared with data on the movement patterns of the specialised egg parasitoid of the herbivore in comparable types of vegetation structure. |
doi_str_mv | 10.1111/j.1570-7458.2009.00872.x |
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The three main structural traits of herbaceous vegetation are density, height, and connectivity. This study determined the herbivore response to each of these three parameters by analysing oviposition patterns in the field and studying the underlying mechanisms in laboratory bioassays. The generalist leaf beetle, Galeruca tanaceti L. (Coleoptera: Chrysomelidae), preferentially deposits its egg clutches on non-host plants such as grasses. Earlier studies revealed that oviposition within structurally complex vegetation reduces the risk of egg parasitism. Consequently, leaf beetle females should prefer patches with dense, tall, or connected vegetation for oviposition in order to increase their reproductive success. In the present study, we tested the following three hypotheses on the effect of stem density, height, and connectivity on oviposition: (1) Within habitats, the number of egg clutches in areas with high stem densities is disproportionately higher than in low-density areas. The number of egg clutches on (2) tall stems or (3) in vegetation with high connectivity is higher than expected for a random distribution. In the field, stem density and height were positively correlated with egg clutch presence. Moreover, a disproportionately high presence of egg clutches was determined in patches with high stem densities. Stem height had a positive influence on oviposition, also in a laboratory two-choice bioassay, whereas stem density and connectivity did not affect oviposition preferences in the laboratory. Therefore, stem height and, potentially, density, but not connectivity, seem to trigger oviposition site selection of the herbivore. This study made evident that certain, but not all traits of the vegetation structure can impose a strong influence on oviposition patterns of herbivorous insects. The results were finally compared with data on the movement patterns of the specialised egg parasitoid of the herbivore in comparable types of vegetation structure.</description><identifier>ISSN: 0013-8703</identifier><identifier>EISSN: 1570-7458</identifier><identifier>DOI: 10.1111/j.1570-7458.2009.00872.x</identifier><identifier>CODEN: ETEAAT</identifier><language>eng</language><publisher>Oxford, UK: Oxford, UK : Blackwell Publishing Ltd</publisher><subject>Animal and plant ecology ; Animal, plant and microbial ecology ; Animals ; Autoecology ; Biological and medical sciences ; Chrysomelidae ; Coleoptera ; Eulophidae ; Fundamental and applied biological sciences. Psychology ; Galeruca ; Hymenoptera ; Oomyzus galerucivorus ; Protozoa. Invertebrata ; tansy leaf beetle ; vegetation structure</subject><ispartof>Entomologia experimentalis et applicata, 2009-08, Vol.132 (2), p.134-146</ispartof><rights>2009 The Authors. 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The three main structural traits of herbaceous vegetation are density, height, and connectivity. This study determined the herbivore response to each of these three parameters by analysing oviposition patterns in the field and studying the underlying mechanisms in laboratory bioassays. The generalist leaf beetle, Galeruca tanaceti L. (Coleoptera: Chrysomelidae), preferentially deposits its egg clutches on non-host plants such as grasses. Earlier studies revealed that oviposition within structurally complex vegetation reduces the risk of egg parasitism. Consequently, leaf beetle females should prefer patches with dense, tall, or connected vegetation for oviposition in order to increase their reproductive success. In the present study, we tested the following three hypotheses on the effect of stem density, height, and connectivity on oviposition: (1) Within habitats, the number of egg clutches in areas with high stem densities is disproportionately higher than in low-density areas. The number of egg clutches on (2) tall stems or (3) in vegetation with high connectivity is higher than expected for a random distribution. In the field, stem density and height were positively correlated with egg clutch presence. Moreover, a disproportionately high presence of egg clutches was determined in patches with high stem densities. Stem height had a positive influence on oviposition, also in a laboratory two-choice bioassay, whereas stem density and connectivity did not affect oviposition preferences in the laboratory. Therefore, stem height and, potentially, density, but not connectivity, seem to trigger oviposition site selection of the herbivore. This study made evident that certain, but not all traits of the vegetation structure can impose a strong influence on oviposition patterns of herbivorous insects. The results were finally compared with data on the movement patterns of the specialised egg parasitoid of the herbivore in comparable types of vegetation structure.</description><subject>Animal and plant ecology</subject><subject>Animal, plant and microbial ecology</subject><subject>Animals</subject><subject>Autoecology</subject><subject>Biological and medical sciences</subject><subject>Chrysomelidae</subject><subject>Coleoptera</subject><subject>Eulophidae</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>Galeruca</subject><subject>Hymenoptera</subject><subject>Oomyzus galerucivorus</subject><subject>Protozoa. Invertebrata</subject><subject>tansy leaf beetle</subject><subject>vegetation structure</subject><issn>0013-8703</issn><issn>1570-7458</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2009</creationdate><recordtype>article</recordtype><recordid>eNqNkk9v0zAYhyMEEmXwGfAFTkvmP3HsSFzGVMq0AQc24GY57uvWJYs72y3tt8chU8_4Ykvv8_vZeuSiQARXJK-LTUW4wKWouawoxm2FsRS0OjwrZqfB82KGMWGlFJi9LF7FuMEYC9GSWbGfWwsmIW_RHlaQdHJ-QEsYokvHc7QGt1qnc6SHJTJ-GDLq9nmCMpTWgPzebX1Gx9BWpwRhGKvGUQ_aog4g9YAWuoewMxolPWgDyb0uXljdR3jztJ8V95_md1efy9tvi-ury9vS1JLTMr-xWQraErKUttW8ZsQQTiU3jWC16WzTYC1bbjthOa8tcMpqRmXXNZQ10rCz4v3Uuw3-cQcxqQcXDfS9HsDvoqKYju1tBuUEmuBjDGDVNrgHHY6KYDWKVhs1-lSjTzWKVv9Eq0OOvnu6Q0ejexv0YFw85SkRrGESZ-7DxP1xPRz_u1_N55f5kOPlFHcxweEU1-G3yjIEVz-_LhT59ePm7uMXqm4y_3birfZKr0J-0v13mr8BJk0WyTH7C8XyqXg</recordid><startdate>200908</startdate><enddate>200908</enddate><creator>Randlkofer, Barbara</creator><creator>Jordan, Florian</creator><creator>Mitesser, Oliver</creator><creator>Meiners, Torsten</creator><creator>Obermaier, Elisabeth</creator><general>Oxford, UK : Blackwell Publishing Ltd</general><general>Blackwell Publishing Ltd</general><general>Blackwell</general><scope>FBQ</scope><scope>BSCLL</scope><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QG</scope><scope>7SN</scope><scope>7SS</scope><scope>C1K</scope></search><sort><creationdate>200908</creationdate><title>Effect of vegetation density, height, and connectivity on the oviposition pattern of the leaf beetle Galeruca tanaceti</title><author>Randlkofer, Barbara ; Jordan, Florian ; Mitesser, Oliver ; Meiners, Torsten ; Obermaier, Elisabeth</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c4852-7796d72911d8f9a5431c15285c6734cbf660a895fb7f554fe5234328bb62368c3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2009</creationdate><topic>Animal and plant ecology</topic><topic>Animal, plant and microbial ecology</topic><topic>Animals</topic><topic>Autoecology</topic><topic>Biological and medical sciences</topic><topic>Chrysomelidae</topic><topic>Coleoptera</topic><topic>Eulophidae</topic><topic>Fundamental and applied biological sciences. Psychology</topic><topic>Galeruca</topic><topic>Hymenoptera</topic><topic>Oomyzus galerucivorus</topic><topic>Protozoa. Invertebrata</topic><topic>tansy leaf beetle</topic><topic>vegetation structure</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Randlkofer, Barbara</creatorcontrib><creatorcontrib>Jordan, Florian</creatorcontrib><creatorcontrib>Mitesser, Oliver</creatorcontrib><creatorcontrib>Meiners, Torsten</creatorcontrib><creatorcontrib>Obermaier, Elisabeth</creatorcontrib><collection>AGRIS</collection><collection>Istex</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Animal Behavior Abstracts</collection><collection>Ecology Abstracts</collection><collection>Entomology Abstracts (Full archive)</collection><collection>Environmental Sciences and Pollution Management</collection><jtitle>Entomologia experimentalis et applicata</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Randlkofer, Barbara</au><au>Jordan, Florian</au><au>Mitesser, Oliver</au><au>Meiners, Torsten</au><au>Obermaier, Elisabeth</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Effect of vegetation density, height, and connectivity on the oviposition pattern of the leaf beetle Galeruca tanaceti</atitle><jtitle>Entomologia experimentalis et applicata</jtitle><date>2009-08</date><risdate>2009</risdate><volume>132</volume><issue>2</issue><spage>134</spage><epage>146</epage><pages>134-146</pages><issn>0013-8703</issn><eissn>1570-7458</eissn><coden>ETEAAT</coden><abstract>Vegetation structure can profoundly influence patterns of abundance, distribution, and reproduction of herbivorous insects and their susceptibility to natural enemies. The three main structural traits of herbaceous vegetation are density, height, and connectivity. This study determined the herbivore response to each of these three parameters by analysing oviposition patterns in the field and studying the underlying mechanisms in laboratory bioassays. The generalist leaf beetle, Galeruca tanaceti L. (Coleoptera: Chrysomelidae), preferentially deposits its egg clutches on non-host plants such as grasses. Earlier studies revealed that oviposition within structurally complex vegetation reduces the risk of egg parasitism. Consequently, leaf beetle females should prefer patches with dense, tall, or connected vegetation for oviposition in order to increase their reproductive success. In the present study, we tested the following three hypotheses on the effect of stem density, height, and connectivity on oviposition: (1) Within habitats, the number of egg clutches in areas with high stem densities is disproportionately higher than in low-density areas. The number of egg clutches on (2) tall stems or (3) in vegetation with high connectivity is higher than expected for a random distribution. In the field, stem density and height were positively correlated with egg clutch presence. Moreover, a disproportionately high presence of egg clutches was determined in patches with high stem densities. Stem height had a positive influence on oviposition, also in a laboratory two-choice bioassay, whereas stem density and connectivity did not affect oviposition preferences in the laboratory. Therefore, stem height and, potentially, density, but not connectivity, seem to trigger oviposition site selection of the herbivore. This study made evident that certain, but not all traits of the vegetation structure can impose a strong influence on oviposition patterns of herbivorous insects. The results were finally compared with data on the movement patterns of the specialised egg parasitoid of the herbivore in comparable types of vegetation structure.</abstract><cop>Oxford, UK</cop><pub>Oxford, UK : Blackwell Publishing Ltd</pub><doi>10.1111/j.1570-7458.2009.00872.x</doi><tpages>13</tpages><oa>free_for_read</oa></addata></record> |
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subjects | Animal and plant ecology Animal, plant and microbial ecology Animals Autoecology Biological and medical sciences Chrysomelidae Coleoptera Eulophidae Fundamental and applied biological sciences. Psychology Galeruca Hymenoptera Oomyzus galerucivorus Protozoa. Invertebrata tansy leaf beetle vegetation structure |
title | Effect of vegetation density, height, and connectivity on the oviposition pattern of the leaf beetle Galeruca tanaceti |
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