Density‐Dependent Regulation of the Sex Ratio in an Annual Plant
Sex ratios are subject to strong frequency‐dependent selection regulated by the mating system and the relative male versus female investment. In androdioecious plant populations, where males co‐occur with hermaphrodites, the sex ratio depends on the rate of self‐fertilization by hermaphrodites and o...
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| Veröffentlicht in: | The American naturalist 2008-06, Vol.171 (6), p.824-830 |
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| container_title | The American naturalist |
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| creator | Dorken, Marcel E. Pannell, John R. |
| description | Sex ratios are subject to strong frequency‐dependent selection regulated by the mating system and the relative male versus female investment. In androdioecious plant populations, where males co‐occur with hermaphrodites, the sex ratio depends on the rate of self‐fertilization by hermaphrodites and on the relative pollen production of males versus hermaphrodites. Here, we report evolutionary changes in the sex ratio from experimental mating arrays of the androdioecious plantMercurialis annua. We found that the progeny sex ratio depended strongly on density, with fewer males in the progeny of plants grown under low density. This occurred in part because of a plastic adjustment in pollen production by hermaphrodites, which produced more pollen when grown at low density than at high density. Our results provide support for the prediction that environmental conditions govern sex ratios through their effects on the relative fertility of unisexual versus hermaphrodite individuals. |
| doi_str_mv | 10.1086/587524 |
| format | Article |
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Geber</contributor><contributor>Fredric J. Janzen</contributor><creatorcontrib>Dorken, Marcel E.</creatorcontrib><creatorcontrib>Pannell, John R.</creatorcontrib><title>Density‐Dependent Regulation of the Sex Ratio in an Annual Plant</title><title>The American naturalist</title><addtitle>Am Nat</addtitle><description>Sex ratios are subject to strong frequency‐dependent selection regulated by the mating system and the relative male versus female investment. In androdioecious plant populations, where males co‐occur with hermaphrodites, the sex ratio depends on the rate of self‐fertilization by hermaphrodites and on the relative pollen production of males versus hermaphrodites. Here, we report evolutionary changes in the sex ratio from experimental mating arrays of the androdioecious plantMercurialis annua. We found that the progeny sex ratio depended strongly on density, with fewer males in the progeny of plants grown under low density. 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Psychology</subject><subject>General aspects</subject><subject>Male animals</subject><subject>Mating behavior</subject><subject>Mercurialis annua</subject><subject>Morocco</subject><subject>Notes and Comments</subject><subject>Plant populations</subject><subject>Plants</subject><subject>Pollen</subject><subject>Population density</subject><subject>Population dynamics</subject><subject>Portugal</subject><subject>Reproduction</subject><subject>Sex allocation</subject><subject>Sex ratio</subject><issn>0003-0147</issn><issn>1537-5323</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2008</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqFkdtKAzEQhoMoWqu-gRJEvVvNcZNcVusJBMXD9ZJmE92yzdZkF_TOR_AZfRJTWlrwxqthho9__vkHgD2MTjGS-RmXghO2BnqYU5FxSug66CGEaIYwE1tgO8ZxahVTfBNsYcmIygXpgfOh9bFqP3--vod2an1pfQsf7WtX67ZqPGwcbN8sfLIf8HE2gZWH2sOB952u4UOtfbsDNpyuo91d1D54ubp8vrjJ7u6vby8Gd5lhOG-zkkhuaCmFE5qVrhQ506YUArOcynSDMRgLp5xJ5pjjWhEzoorYkltKRkjSPjiZ605D897Z2BaTKhpbJw-26WKRK6yYyMW_IEFKpABwAg__gOOmCz4dUWAlkzXK0UrNhCbGYF0xDdVEh88Co2KWfTHPPoEHC7VuNLHlCluEnYDjBaCj0bUL2psqLjmCKJs9K3FHc64zb5XRr8002BhX3pb79ufYOLZNWMpQhDGTjNNfRwCfTQ</recordid><startdate>20080601</startdate><enddate>20080601</enddate><creator>Dorken, Marcel E.</creator><creator>Pannell, John R.</creator><general>The University of Chicago Press</general><general>University of Chicago Press</general><general>University of Chicago, acting through its Press</general><scope>IQODW</scope><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QG</scope><scope>7SN</scope><scope>7SS</scope><scope>7ST</scope><scope>8FD</scope><scope>C1K</scope><scope>FR3</scope><scope>P64</scope><scope>RC3</scope><scope>SOI</scope><scope>7X8</scope></search><sort><creationdate>20080601</creationdate><title>Density‐Dependent Regulation of the Sex Ratio in an Annual Plant</title><author>Dorken, Marcel E. ; Pannell, John R.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c416t-d285c3d87f7a4dfd764acd7714638108cc117f9fc1844f5a92cb392ed5e32b083</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2008</creationdate><topic>Animal and plant ecology</topic><topic>Animal, plant and microbial ecology</topic><topic>Biological and medical sciences</topic><topic>Botany</topic><topic>Density</topic><topic>Environment</topic><topic>Environmental disorders</topic><topic>Euphorbiaceae - physiology</topic><topic>Evolution</topic><topic>Evolutionary biology</topic><topic>Flowers & plants</topic><topic>Fundamental and applied biological sciences. 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| subjects | Animal and plant ecology Animal, plant and microbial ecology Biological and medical sciences Botany Density Environment Environmental disorders Euphorbiaceae - physiology Evolution Evolutionary biology Flowers & plants Fundamental and applied biological sciences. Psychology General aspects Male animals Mating behavior Mercurialis annua Morocco Notes and Comments Plant populations Plants Pollen Population density Population dynamics Portugal Reproduction Sex allocation Sex ratio |
| title | Density‐Dependent Regulation of the Sex Ratio in an Annual Plant |
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