DOI: 10.5683/sp3/yzy9tn
title: Data from: Offspring of older parents are smaller—but no less bilaterally symmetrical—than offspring of younger parents in the aquatic plant Lemna turionifera

description: &lt;b&gt;Abstract&lt;/b&gt;&lt;br/&gt;Offspring quality decreases with parental age in many taxa, with offspring of older parents exhibiting reduced lifespan, reproductive capacity, and fitness, compared to offspring of younger parents. These ‘parental age effects’, whose consequences arise in the next generation, can be considered as manifestations of parental senescence, in addition to the more familiar age-related declines in parent-generation survival and reproduction. Parental age effects are important because they may have feedback effects on the evolution of demographic trajectories and longevity. In addition to altering the timing of offspring life-history milestones, parental age effects can also have a negative impact on offspring size, with offspring of older parents being smaller than offspring of younger parents. Here, we consider the effects of advancing parental age on a different aspect of offspring morphology, body symmetry. In this study, we followed all 403 offspring of 30 parents of a bilaterally symmetrical, clonally reproducing aquatic plant species, Lemna turionifera, to test the hypothesis that successive offspring become less symmetrical as their parent ages, using the ‘Continuous Symmetry Measure’ as an index. Although successive offspring of aging parents older than one week became smaller and smaller, we found scant evidence for any reduction in bilateral symmetry.
description: &lt;b&gt;Usage notes&lt;/b&gt;&lt;br /&gt;&lt;div class="o-metadata__file-usage-entry"&gt;&lt;h4 class="o-heading__level3-file-title"&gt;Ankutowicz_and_Laird_data&lt;/h4&gt;&lt;div class="o-metadata__file-description"&gt;Data from Ankutowicz and Laird, "Offspring of older parents are smaller—but no less bilaterally symmetrical—than offspring of younger parents in the aquatic plant Lemna turionifera"; see associated README file for column-header details.&lt;/div&gt;&lt;div class="o-metadata__file-name"&gt;&lt;/div&gt;&lt;div class="o-metadata__file-name"&gt;&lt;/div&gt;&lt;/div&gt;&lt;div class="o-metadata__file-usage-entry"&gt;&lt;h4 class="o-heading__level3-file-title"&gt;Ankutowicz_and_Laird_R_scripts&lt;/h4&gt;&lt;div class="o-metadata__file-description"&gt;R scripts accompanying Ankutowicz and Laird, "Offspring of older parents are smaller—but no less bilaterally symmetrical—than offspring of younger parents in the aquatic plant Lemna turionifera"&lt;/div&gt;&lt;div class="o-metadata__file-name"&gt;&lt;/div&gt;&lt;/div&gt;&lt;div class="o-metadata__file-usage-entry"&gt;&lt;h4 class="o-heading__level3-file-title"&gt;otsu&lt;/h4&gt;&lt;div class="o-metadata__file-description"&gt;Matlab function for image thresholding.&lt;/div&gt;&lt;div class="o-metadata__file-name"&gt;&lt;/div&gt;&lt;/div&gt;&lt;div class="o-metadata__file-usage-entry"&gt;&lt;h4 class="o-heading__level3-file-title"&gt;seg&lt;/h4&gt;&lt;div class="o-metadata__file-description"&gt;Matlab function for image segmentation.&lt;/div&gt;&lt;div class="o-metadata__file-name"&gt;&lt;/div&gt;&lt;/div&gt;&lt;div class="o-metadata__file-usage-entry"&gt;&lt;h4 class="o-heading__level3-file-title"&gt;filt&lt;/h4&gt;&lt;div class="o-metadata__file-description"&gt;Matlab function for image filtering.&lt;/div&gt;&lt;div class="o-metadata__file-name"&gt;&lt;/div&gt;&lt;/div&gt;&lt;div class="o-metadata__file-usage-entry"&gt;&lt;h4 class="o-heading__level3-file-title"&gt;floodfill&lt;/h4&gt;&lt;div class="o-metadata__file-description"&gt;Matlab function for flood-filling an image.&lt;/div&gt;&lt;div class="o-metadata__file-name"&gt;&lt;/div&gt;&lt;/div&gt;&lt;div class="o-metadata__file-usage-entry"&gt;&lt;h4 class="o-heading__level3-file-title"&gt;bound&lt;/h4&gt;&lt;div class="o-metadata__file-description"&gt;Matlab function for boundary detection of an image.&lt;/div&gt;&lt;div class="o-metadata__file-name"&gt;&lt;/div&gt;&lt;/div&gt;&lt;div class="o-metadata__file-usage-entry"&gt;&lt;h4 class="o-heading__level3-file-title"&gt;csm_mirror&lt;/h4&gt;&lt;div class="o-metadata__file-description"&gt;Matlab function for finding the continuous symmetry measure (CSM) associated with bilateral (/mirror) symmetry in an image.&lt;/div&gt;&lt;div class="o-metadata__file-name"&gt;&lt;/div&gt;&lt;/div&gt;
description: <b>Dryad version number:</b> 1
<b>Version status:</b> submitted
<b>Dryad curation status:</b> Published
<b>Sharing link:</b> http://datadryad.org/stash/dataset/doi:10.5061/dryad.29710
<b>Storage size:</b> 130288
<b>Visibility:</b> public