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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Growth of pioneer beach plants is strongly driven by buried macroalgal wrack, whereas macroinvertebrates affect plant nutrient dynamics
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Growth of pioneer beach plants is strongly driven by buried macroalgal wrack, whereas macroinvertebrates affect plant nutrient dynamics

机译：先驱性海滩植物的生长在很大程度上是由埋藏的巨藻残骸驱动的，而大型无脊椎动物会影响植物的养分动态

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摘要

Sandy beach food webs depend heavily upon marine organic input, such as macroalgae, as internal organic matter productivity is low. The fate, however, of this marine organic material (termed wrack) after being deposited onto the beach and its relation to pioneer vegetation, consisting of annual and perennial beach plants, needs to be further elucidated. In particular, the effect of various drivers, such as wrack burial and macro invertebrate presence, on wrack decomposition is largely unknown on sandy beaches. Also, the subsequent effects of decomposition-driven nitrogen and phosphorus availability on beach pioneer plant growth are not yet understood. We performed a mesocosm experiment manipulating Fucus vesiculosus wrack access to the supratidal amphipod Talitrus saltator, and used Cakile maritima and Elytrigia juncea as phytometers to estimate decomposition-driven, wrack-derived nutrient supply. Buried wrack had a strong positive effect (2-3 fold increase) on plant mass, N and P content of C. maritima compared to surface wrack, while effects on E. juncea were largely absent. In addition, macroinvertebrate-facilitated decomposition was important for increasing nutrient availability, but this did not result in an increase in plant growth. We conclude that the burial of wrack by a thin layer of sand is a crucial driver of beach pioneer plant growth, which is most likely due to an increase in moisture availability. This supports the importance of management practices that allow deposited wrack to remain and be buried on the sandy beach for a long period of time, which will have positive effects on beach pioneer plant growth and possibly embryo dune formation.
机译：沙滩食物网严重依赖海洋有机物输入，例如大型藻类，因为内部有机物生产率低。但是，需要进一步阐明这种海洋有机材料（称为残骸）在沉积到海滩上后的命运，以及它与包括一年生和多年生海滩植物的先锋植物的关系。尤其是，在沙滩上，各种原因（例如残骸埋葬和大型无脊椎动物的存在）对残骸分解的影响在很大程度上是未知的。同样，尚未理解分解驱动的氮和磷的可获得性对海滩先锋植物生长的后续影响。我们进行了一项介观实验，操纵了墨角藻残骸进入上肢两栖动物塔利图斯盐沼的操作，并使用Cakile maritima和Elytrigia juncea作为植酸计来估计分解驱动的，由残骸衍生的营养物供应。相比于表面残骸，埋葬残骸对海藻的质量，N和P含量具有很强的正效应（增加了2-3倍），而对芥菜大肠埃希菌的影响几乎没有。此外，无脊椎动物促进的分解对于增加养分的利用率很重要，但这并没有导致植物生长的增加。我们得出的结论是，用薄薄的沙子掩埋沉船残骸是海滩先锋植物生长的关键驱动力，这很可能是由于水分供应的增加。这支持了管理实践的重要性，该管理实践允许沉积的残骸长时间保留并掩埋在沙滩上，这将对海滩先锋植物的生长以及可能形成的沙丘产生积极影响。

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