Density‐dependent within‐patch movement behavior of two competing species
Abstract Movement behavior is central to understanding species distributions, population dynamics and coexistence with other species. Although the relationship between conspecific density and emigration has been well studied, little attention has been paid to how interspecific competitor density aff...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2023-11-01
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| Series: | Ecology and Evolution |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/ece3.10753 |
| _version_ | 1797448628325842944 |
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| author | James T. Cronin Jerome Goddard II Aaron Krivchenia Ratnasingham Shivaji |
| author_facet | James T. Cronin Jerome Goddard II Aaron Krivchenia Ratnasingham Shivaji |
| author_sort | James T. Cronin |
| collection | DOAJ |
| description | Abstract Movement behavior is central to understanding species distributions, population dynamics and coexistence with other species. Although the relationship between conspecific density and emigration has been well studied, little attention has been paid to how interspecific competitor density affects another species' movement behavior. We conducted releases of two species of competing Tribolium flour beetles at different densities, alone and together in homogeneous microcosms, and tested whether their recaptures‐with‐distance were well described by a random‐diffusion model. We also determined whether mean displacement distances varied with the release density of conspecific and heterospecific beetles. A diffusion model provided a good fit to the redistribution of T. castaneum and T. confusum at all release densities, explaining an average of >60% of the variation in recaptures. For both species, mean displacement (directly proportional to the diffusion rate) exhibited a humped‐shaped relationship with conspecific density. Finally, we found that both species of beetle impacted the within‐patch movement rates of the other species, but the effect depended on density. For T. castaneum in the highest density treatment, the addition of equal numbers of T. castaneum or T. confusum had the same effect, with mean displacements reduced by approximately one half. The same result occurred for T. confusum released at an intermediate density. In both cases, it was total beetle abundance, not species identity that mattered to mean displacement. We suggest that displacement or diffusion rates that exhibit a nonlinear relationship with density or depend on the presence or abundance of interacting species should be considered when attempting to predict the spatial spread of populations or scaling up to heterogeneous landscapes. |
| first_indexed | 2024-03-09T14:14:10Z |
| format | Article |
| id | doaj.art-d8e80a668258410db6f65aa84c613ca5 |
| institution | Directory Open Access Journal |
| issn | 2045-7758 |
| language | English |
| last_indexed | 2024-03-09T14:14:10Z |
| publishDate | 2023-11-01 |
| publisher | Wiley |
| record_format | Article |
| series | Ecology and Evolution |
| spelling | doaj.art-d8e80a668258410db6f65aa84c613ca52023-11-29T05:44:08ZengWileyEcology and Evolution2045-77582023-11-011311n/an/a10.1002/ece3.10753Density‐dependent within‐patch movement behavior of two competing speciesJames T. Cronin0Jerome Goddard II1Aaron Krivchenia2Ratnasingham Shivaji3Department of Biological Sciences Louisiana State University Baton Rouge Louisiana USADepartment of Mathematics and Computer Science Auburn University Montgomery Montgomery Alabama USADepartment of Biological Sciences Louisiana State University Baton Rouge Louisiana USADepartment of Mathematics and Statistics University of North Carolina Greensboro Greensboro North Carolina USAAbstract Movement behavior is central to understanding species distributions, population dynamics and coexistence with other species. Although the relationship between conspecific density and emigration has been well studied, little attention has been paid to how interspecific competitor density affects another species' movement behavior. We conducted releases of two species of competing Tribolium flour beetles at different densities, alone and together in homogeneous microcosms, and tested whether their recaptures‐with‐distance were well described by a random‐diffusion model. We also determined whether mean displacement distances varied with the release density of conspecific and heterospecific beetles. A diffusion model provided a good fit to the redistribution of T. castaneum and T. confusum at all release densities, explaining an average of >60% of the variation in recaptures. For both species, mean displacement (directly proportional to the diffusion rate) exhibited a humped‐shaped relationship with conspecific density. Finally, we found that both species of beetle impacted the within‐patch movement rates of the other species, but the effect depended on density. For T. castaneum in the highest density treatment, the addition of equal numbers of T. castaneum or T. confusum had the same effect, with mean displacements reduced by approximately one half. The same result occurred for T. confusum released at an intermediate density. In both cases, it was total beetle abundance, not species identity that mattered to mean displacement. We suggest that displacement or diffusion rates that exhibit a nonlinear relationship with density or depend on the presence or abundance of interacting species should be considered when attempting to predict the spatial spread of populations or scaling up to heterogeneous landscapes.https://doi.org/10.1002/ece3.10753density‐dependent movementdiffusionmicrocosm experimentspatial spreadTribolium castaneumTribolium confusum |
| spellingShingle | James T. Cronin Jerome Goddard II Aaron Krivchenia Ratnasingham Shivaji Density‐dependent within‐patch movement behavior of two competing species Ecology and Evolution density‐dependent movement diffusion microcosm experiment spatial spread Tribolium castaneum Tribolium confusum |
| title | Density‐dependent within‐patch movement behavior of two competing species |
| title_full | Density‐dependent within‐patch movement behavior of two competing species |
| title_fullStr | Density‐dependent within‐patch movement behavior of two competing species |
| title_full_unstemmed | Density‐dependent within‐patch movement behavior of two competing species |
| title_short | Density‐dependent within‐patch movement behavior of two competing species |
| title_sort | density dependent within patch movement behavior of two competing species |
| topic | density‐dependent movement diffusion microcosm experiment spatial spread Tribolium castaneum Tribolium confusum |
| url | https://doi.org/10.1002/ece3.10753 |
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