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Sediment availability provokes a shift from Brownian to Lévy‐like clonal expansion in a dune building grass
Ecology Letters ( IF 8.8 ) Pub Date : 2020-11-12 , DOI: 10.1111/ele.13638
Valérie C. Reijers 1, 2, 3 , Selwyn Hoeks 2, 4 , Jim Belzen 5 , Koen Siteur 5, 6 , Anne J. A. Rond 2 , Clea N. Ven 1 , Carlijn Lammers 1, 2 , Johan Koppel 5, 7 , Tjisse Heide 1, 2, 7
Affiliation  

In biogeomorphic landscapes, plant traits can steer landscape development through plant‐mediated feedback interactions. Interspecific differences in clonal expansion strategy can therefore lead to the emergence of different landscape organisations. Yet, whether landscape‐forming plants adopt different clonal expansion strategies depending on their physical environment remains to be tested. Here, we use a field survey and a complementary mesocosm approach to investigate whether sediment deposition affects the clonal expansion strategy employed by dune‐building marram grass individuals. Our results reveal a consistent shift in expansion pattern from more clumped, Brownian‐like, movement in sediment‐poor conditions, to patchier, Lévy‐like, movement under high sediment supply rates. Additional model simulations illustrate that the sediment‐dependent shift in movement strategies induces a shift in optimisation of the cost–benefit relation between landscape engineering (i.e. dune formation) and expansion. Plasticity in expansion strategy may therefore allow landscape‐forming plants to optimise their engineering ability depending on their physical landscape.

中文翻译:

沉积物的可利用性促使沙丘草丛中的布朗氏菌向莱维氏菌的克隆扩张转变

在生物地貌景观中,植物性状可以通过植物介导的反馈相互作用引导景观发展。因此,克隆扩展策略的种间差异可能导致出现不同的景观组织。然而,造景植物是否根据其物理环境采用不同的克隆扩展策略仍有待测试。在这里,我们使用现场调查和补充性的中观方法来研究沉积物沉积是否影响沙丘造mar草个体采用的克隆扩展策略。我们的结果表明,在高沉积物供应速率下,膨胀模式从在淤积较差的条件下更团块状的布朗运动向向Lévy状的斑块运动一致转变。附加的模型模拟表明,与沉积物有关的移动策略变化导致景观工程(即沙丘形成)与扩张之间的成本-收益关系的优化变化。因此,扩展策略中的可塑性可以使景观形成工厂根据其实际景观来优化其工程能力。
更新日期:2021-01-11
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