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2 results for “Tidal Meanders”
Tidal channel meanders serve as stepping-stones to facilitate cordgrass landward spread by creating invasion windows
<p>Understanding the mechanisms by which geomorphic structures affect habitat invasibility by mediating various abiotic and biotic factors is essential for predicting whether these geomorphic structures may provide spatial windows of opportunity to facilitate range-expansion of invasive species in salt marshes. Many studies have linked geomorphic landscape features such as tidal channels to invasion by exotic plants, but the role of tidal channel meanders (i.e., convex and concave sides) in regulating the <em>Spartina</em> invasion remains unclear. Here, we examined the combined effects of tidal channel meander-mediated hydrodynamic variables, soil abiotic stresses and propagule pressure on the colonization of <em>Spartina</em> in the Yellow River Delta, China, by conducting field observations and experiments. The results showed that lower hydrodynamic disturbance, bed shear stress, and higher propagule pressure triggered by eddies due to the convex structure of channel meanders facilitated <em>Spartina</em> seedling establishment and growth, whereas the concave side considerably inhibited the <em>Spartina</em> invasion. Lower soil abiotic stresses also significantly promoted the invasibility of the channel meanders by <em>Spartina</em>. Based on these findings, we propose a conceptual framework to illustrate the effects of the meandering geomorphology of tidal channels on the mechanisms that might allow the landward spread of <em>Spartina</em> and related processes. Our results demonstrate that the meandering geomorphic structures of tidal channels could act as stepping-stones to significantly facilitate the landward invasion of <em>Spartina</em> along tidal channels. This implies that geomorphic characteristics of tidal channels should be integrated into invasive species control and salt marsh management strategies.</p>
Tidal channel meanders serve as stepping-stones to facilitate cordgrass landward spread by creating invasion windows
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