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Secondary dispersal driven by overland flow in drylands: Review and mechanistic model development
Seed dispersal alters gene flow, reproduction, migration and ultimately spatial organization of dryland ecosystems. Because many seeds in drylands lack adaptations for long-distance dispersal, seed transport by secondary processes such as tumbling in the wind or mobilization in overland flow plays a...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
BioMed Central
2014
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4267596/ https://www.ncbi.nlm.nih.gov/pubmed/25520817 http://dx.doi.org/10.1186/2051-3933-2-7 |
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author | Thompson, Sally E Assouline, Shmuel Chen, Li Trahktenbrot, Ana Svoray, Tal Katul, Gabriel G |
author_facet | Thompson, Sally E Assouline, Shmuel Chen, Li Trahktenbrot, Ana Svoray, Tal Katul, Gabriel G |
author_sort | Thompson, Sally E |
collection | PubMed |
description | Seed dispersal alters gene flow, reproduction, migration and ultimately spatial organization of dryland ecosystems. Because many seeds in drylands lack adaptations for long-distance dispersal, seed transport by secondary processes such as tumbling in the wind or mobilization in overland flow plays a dominant role in determining where seeds ultimately germinate. Here, recent developments in modeling runoff generation in spatially complex dryland ecosystems are reviewed with the aim of proposing improvements to mechanistic modeling of seed dispersal processes. The objective is to develop a physically-based yet operational framework for determining seed dispersal due to surface runoff, a process that has gained recent experimental attention. A Buoyant OBject Coupled Eulerian – Lagrangian Closure model (BOB-CELC) is proposed to represent seed movement in shallow surface flows. The BOB-CELC is then employed to investigate the sensitivity of seed transport to landscape and storm properties and to the spatial configuration of vegetation patches interspersed within bare earth. The potential to simplify seed transport outcomes by considering the limiting behavior of multiple runoff events is briefly considered, as is the potential for developing highly mechanistic, spatially explicit models that link seed transport, vegetation structure and water movement across multiple generations of dryland plants. |
format | Online Article Text |
id | pubmed-4267596 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2014 |
publisher | BioMed Central |
record_format | MEDLINE/PubMed |
spelling | pubmed-42675962014-12-17 Secondary dispersal driven by overland flow in drylands: Review and mechanistic model development Thompson, Sally E Assouline, Shmuel Chen, Li Trahktenbrot, Ana Svoray, Tal Katul, Gabriel G Mov Ecol Review Seed dispersal alters gene flow, reproduction, migration and ultimately spatial organization of dryland ecosystems. Because many seeds in drylands lack adaptations for long-distance dispersal, seed transport by secondary processes such as tumbling in the wind or mobilization in overland flow plays a dominant role in determining where seeds ultimately germinate. Here, recent developments in modeling runoff generation in spatially complex dryland ecosystems are reviewed with the aim of proposing improvements to mechanistic modeling of seed dispersal processes. The objective is to develop a physically-based yet operational framework for determining seed dispersal due to surface runoff, a process that has gained recent experimental attention. A Buoyant OBject Coupled Eulerian – Lagrangian Closure model (BOB-CELC) is proposed to represent seed movement in shallow surface flows. The BOB-CELC is then employed to investigate the sensitivity of seed transport to landscape and storm properties and to the spatial configuration of vegetation patches interspersed within bare earth. The potential to simplify seed transport outcomes by considering the limiting behavior of multiple runoff events is briefly considered, as is the potential for developing highly mechanistic, spatially explicit models that link seed transport, vegetation structure and water movement across multiple generations of dryland plants. BioMed Central 2014-04-17 /pmc/articles/PMC4267596/ /pubmed/25520817 http://dx.doi.org/10.1186/2051-3933-2-7 Text en © Thompson et al.; licensee BioMed Central Ltd. 2014 This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated. |
spellingShingle | Review Thompson, Sally E Assouline, Shmuel Chen, Li Trahktenbrot, Ana Svoray, Tal Katul, Gabriel G Secondary dispersal driven by overland flow in drylands: Review and mechanistic model development |
title | Secondary dispersal driven by overland flow in drylands: Review and mechanistic model development |
title_full | Secondary dispersal driven by overland flow in drylands: Review and mechanistic model development |
title_fullStr | Secondary dispersal driven by overland flow in drylands: Review and mechanistic model development |
title_full_unstemmed | Secondary dispersal driven by overland flow in drylands: Review and mechanistic model development |
title_short | Secondary dispersal driven by overland flow in drylands: Review and mechanistic model development |
title_sort | secondary dispersal driven by overland flow in drylands: review and mechanistic model development |
topic | Review |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4267596/ https://www.ncbi.nlm.nih.gov/pubmed/25520817 http://dx.doi.org/10.1186/2051-3933-2-7 |
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