Neutral processes and reduced dispersal across Amazonian rivers may explain how rivers maintain species diversity after secondary contact
Amazonian rivers are only partial barriers to the dispersal of most species, but they still form the limits between the distributions of many similar species. We show that two competitively-identical species may remain allopatric for hundreds of generations when a river only reduces the chance of a...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-04-01
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| Series: | Perspectives in Ecology and Conservation |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2530064421001012 |
| _version_ | 1818212790361391104 |
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| author | Sergio Santorelli Junior William E. Magnusson Cláudia Pereira de Deus Timothy H. Keitt |
| author_facet | Sergio Santorelli Junior William E. Magnusson Cláudia Pereira de Deus Timothy H. Keitt |
| author_sort | Sergio Santorelli Junior |
| collection | DOAJ |
| description | Amazonian rivers are only partial barriers to the dispersal of most species, but they still form the limits between the distributions of many similar species. We show that two competitively-identical species may remain allopatric for hundreds of generations when a river only reduces the chance of a species crossing it. To illustrate this, we developed a two-dimensional cellular automata for two allopatric species under neutral-theory dynamics and recorded the time required for the first extinction of a species and the frequency with which it occurred across replicate simulations. Our results indicate that neutral processes associated with reduced dispersal across rivers can maintain competitively-identical species allopatric for hundreds of generations despite repeated river crossings. These cross-river incursions were rarely successful owing to the low likelihood of a rare invader outcompeting resident populations. This process provides a plausible mechanism for the maintenance of Amazonian biodiversity and may explain the spatial-distribution limits of species caused by large rivers in the Amazon that are not absolute barriers to dispersal. |
| first_indexed | 2024-12-12T05:53:59Z |
| format | Article |
| id | doaj.art-6061df950fa1419f88ffac6febc0571a |
| institution | Directory Open Access Journal |
| issn | 2530-0644 |
| language | English |
| last_indexed | 2024-12-12T05:53:59Z |
| publishDate | 2022-04-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Perspectives in Ecology and Conservation |
| spelling | doaj.art-6061df950fa1419f88ffac6febc0571a2022-12-22T00:35:36ZengElsevierPerspectives in Ecology and Conservation2530-06442022-04-01202151158Neutral processes and reduced dispersal across Amazonian rivers may explain how rivers maintain species diversity after secondary contactSergio Santorelli Junior0William E. Magnusson1Cláudia Pereira de Deus2Timothy H. Keitt3Programa de Pós Graduação em Ciências Biológicas, Instituto Nacional de Pesquisas da Amazônia, Manaus, AM, Brazil; Corresponding author. Present address: Centro de Estudos Integrados da Biodiversidade Amazônica - CENBAM/PPBio, Instituto Nacional de Pesquisas da Amazônia, Manaus, AM, Brazil.Coordenação de Pesquisas em Biodiversidade, Instituto Nacional de Pesquisas da Amazônia, Manaus, AM, BrazilCoordenação de Pesquisas em Biodiversidade, Instituto Nacional de Pesquisas da Amazônia, Manaus, AM, BrazilDepartment of Integrative Biology, University of Texas at Austin, Austin, TX, USAAmazonian rivers are only partial barriers to the dispersal of most species, but they still form the limits between the distributions of many similar species. We show that two competitively-identical species may remain allopatric for hundreds of generations when a river only reduces the chance of a species crossing it. To illustrate this, we developed a two-dimensional cellular automata for two allopatric species under neutral-theory dynamics and recorded the time required for the first extinction of a species and the frequency with which it occurred across replicate simulations. Our results indicate that neutral processes associated with reduced dispersal across rivers can maintain competitively-identical species allopatric for hundreds of generations despite repeated river crossings. These cross-river incursions were rarely successful owing to the low likelihood of a rare invader outcompeting resident populations. This process provides a plausible mechanism for the maintenance of Amazonian biodiversity and may explain the spatial-distribution limits of species caused by large rivers in the Amazon that are not absolute barriers to dispersal.http://www.sciencedirect.com/science/article/pii/S2530064421001012AllopatrySecondary contactAmazonian riversNeutral processReduced dispersalAmazonian biodiversity |
| spellingShingle | Sergio Santorelli Junior William E. Magnusson Cláudia Pereira de Deus Timothy H. Keitt Neutral processes and reduced dispersal across Amazonian rivers may explain how rivers maintain species diversity after secondary contact Perspectives in Ecology and Conservation Allopatry Secondary contact Amazonian rivers Neutral process Reduced dispersal Amazonian biodiversity |
| title | Neutral processes and reduced dispersal across Amazonian rivers may explain how rivers maintain species diversity after secondary contact |
| title_full | Neutral processes and reduced dispersal across Amazonian rivers may explain how rivers maintain species diversity after secondary contact |
| title_fullStr | Neutral processes and reduced dispersal across Amazonian rivers may explain how rivers maintain species diversity after secondary contact |
| title_full_unstemmed | Neutral processes and reduced dispersal across Amazonian rivers may explain how rivers maintain species diversity after secondary contact |
| title_short | Neutral processes and reduced dispersal across Amazonian rivers may explain how rivers maintain species diversity after secondary contact |
| title_sort | neutral processes and reduced dispersal across amazonian rivers may explain how rivers maintain species diversity after secondary contact |
| topic | Allopatry Secondary contact Amazonian rivers Neutral process Reduced dispersal Amazonian biodiversity |
| url | http://www.sciencedirect.com/science/article/pii/S2530064421001012 |
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