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Interspecific competition slows range expansion and shapes range boundaries Legault, Geoffrey; Bitters, Matthew; Hastings, Alan; Melbourne, Brett
Description
<b>Abstract</b><br/><p class="western" style="margin-top:16px;margin-bottom:4px;text-align:left;"><span style="background:transparent none 0% 0%;"><span style="page-break-after:avoid;"><font color="#000000"><font><font>Species expanding into new habitats as a result of climate change or human introductions will frequently encounter resident competitors. Theoretical models suggest that such interspecific competition can alter the speed of expansion and the shape of expanding range boundaries. However, competitive interactions are rarely considered when forecasting the success or speed of expansion, in part because there has been no direct experimental evidence that competition affects either expansion speed or boundary shape. Here we demonstrate that interspecific competition alters both expansion speed and range boundary shape. Using a two-species experimental system of the flour beetles </font></font></font><font color="#000000"><font><font><i>Tribolium castaneum</i></font></font></font><font color="#000000"><font><font> and </font></font></font><font color="#000000"><font><font><i>Tribolium</i></font></font></font><font color="#000000"><font> </font></font><font color="#000000"><font><font><i>confusum</i></font></font></font><font color="#000000"><font><font>, we show that interspecific competition dramatically slows expansion across a landscape over multiple generations. Using a parameterized stochastic model of expansion, we find that this slowdown can persist over the long-term. We also find that the shape of the moving range boundary changes continuously over many generations of expansion, first steepening and then becoming shallower, due to the competitive effect of the resident and density-dependent dispersal of the invader. This dynamic boundary shape suggests that current forecasting approaches assuming a constant shape could be misleading. More broadly, our results demonstrate that interactions between competing species can play a large role during range expansions and thus should be included in models and studies that monitor, forecast, or manage expansions in natural systems.</font></font></font></span></span></p>; <b>Usage notes</b><br />
This ZIP archive contains R scripts and data files necessary for reproducing the analysis and figures of the paper. See the README file in the archive for further details.</p>
Item Metadata
Title |
Interspecific competition slows range expansion and shapes range boundaries
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Creator | |
Date Issued |
2021-05-19
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Description |
<b>Abstract</b><br/><p class="western" style="margin-top:16px;margin-bottom:4px;text-align:left;"><span style="background:transparent none 0% 0%;"><span style="page-break-after:avoid;"><font color="#000000"><font><font>Species expanding into new habitats as a result of climate change or human introductions will frequently encounter resident competitors. Theoretical models suggest that such interspecific competition can alter the speed of expansion and the shape of expanding range boundaries. However, competitive interactions are rarely considered when forecasting the success or speed of expansion, in part because there has been no direct experimental evidence that competition affects either expansion speed or boundary shape. Here we demonstrate that interspecific competition alters both expansion speed and range boundary shape. Using a two-species experimental system of the flour beetles </font></font></font><font color="#000000"><font><font><i>Tribolium castaneum</i></font></font></font><font color="#000000"><font><font> and </font></font></font><font color="#000000"><font><font><i>Tribolium</i></font></font></font><font color="#000000"><font> </font></font><font color="#000000"><font><font><i>confusum</i></font></font></font><font color="#000000"><font><font>, we show that interspecific competition dramatically slows expansion across a landscape over multiple generations. Using a parameterized stochastic model of expansion, we find that this slowdown can persist over the long-term. We also find that the shape of the moving range boundary changes continuously over many generations of expansion, first steepening and then becoming shallower, due to the competitive effect of the resident and density-dependent dispersal of the invader. This dynamic boundary shape suggests that current forecasting approaches assuming a constant shape could be misleading. More broadly, our results demonstrate that interactions between competing species can play a large role during range expansions and thus should be included in models and studies that monitor, forecast, or manage expansions in natural systems.</font></font></font></span></span></p>; <b>Usage notes</b><br />
This ZIP archive contains R scripts and data files necessary for reproducing the analysis and figures of the paper. See the README file in the archive for further details.</p> |
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Type | |
Notes |
Dryad version number: 5</p> Version status: submitted</p> Dryad curation status: Published</p> Sharing link: https://datadryad.org/stash/share/Oob4asO9xWWWT9Q1UQ6lOZiVjVWagKgVqyl7yFLtPN8</p> Storage size: 214064</p> Visibility: public</p> |
Date Available |
2020-09-28
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Provider |
University of British Columbia Library
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License |
CC0 1.0
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DOI |
10.14288/1.0397896
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URI | |
Publisher DOI | |
Rights URI | |
Aggregated Source Repository |
Dataverse
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Item Media
Item Citations and Data
Licence
CC0 1.0