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首页> 外文期刊>Marine ecology progress series >Identifying potential pathways for turtle-derived nutrients cycling through beach ecosystems
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Identifying potential pathways for turtle-derived nutrients cycling through beach ecosystems

机译：找出海龟来源的养分在海滩生态系统中循环的潜在途径

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Resource fluxes between spatially separated ecosystems are ubiquitous and can strongly influence biotic communities and food web dynamics. These community effects should be most evident during resource pulses in oligotrophic systems, such as sandy beaches, which generally rely on allochthonous inputs. Here, we examined the role of sea turtles as vectors of nutrients from marine to coastal/terrestrial systems during the nesting season 'resource pulse', by ex ploring the utilization of turtle-derived nutrients by beach biota in South Africa. Nutrient uptake was tested by comparing the delta C-13 and delta N-15 isotopic values of representative taxa of 5 predicted supralittoral and intertidal pathways with that of turtle eggs. Turtle-derived nutrient uptake was confirmed only for supralittoral pathways (directly via ghost crabs and dune plants, indirectly via meiofauna), with limited evidence for intertidal pathways. The latter are expected to be secondary to the former given their spatial separation from nests and the exceptional rates of nutrient cycling through beaches; however, they may be more important on beaches where turtle densities are higher than in South Africa, and/or where hatching success is lower. Apart from turtle-derived nutrients that are exported to the ocean as hatchlings, the majority of nutrients from the turtle-egg resource pulse produce localized effects and are processed in the supralittoral. They are consumed by mobile vertebrate and invertebrate predators and scavengers, taken up by dune plants and decomposed by microbes and meiofauna. This highlights the ecological role of turtles as biotic transporters of nutrients and the value of beaches for ecosystem services.
机译：在空间上分离的生态系统之间的资源流动无处不在，并且可以强烈影响生物群落和食物网的动态。在贫营养系统（例如，通常依赖于异源输入的沙滩）中的资源脉冲期间，这些群落效应应该最为明显。在这里，我们通过探讨南非海滩生物对海龟衍生养分的利用，研究了海龟作为筑巢季节“资源脉动”期间从海洋到沿海/陆地系统养分的载体的作用。通过比较5种预测的腹膜上和潮间途径与turtle卵的代表性分类单元的δC-13和δN-15同位素值来测试营养吸收。仅在沿sup上途径（直接通过鬼蟹和沙丘植物，间接通过介壳动物）中证实了龟源的养分吸收，潮间带途径的证据有限。鉴于后者与巢之间的空间分隔以及养分在海滩中循环的异常速率，预计后者将排在第二位。但是，它们在海龟密度高于南非和/或孵化成功率较低的海滩上可能更为重要。除了作为孵化场出口到海洋的海龟来源的养分外，海龟卵资源脉冲中的大部分养分产生局部效应，并在腹膜上进行处理。它们被活动的脊椎动物和无脊椎动物的捕食者和清除剂所消耗，被沙丘植物吸收，并被微生物和藻类动物分解。这凸显了海龟作为养分的生物转运体的生态作用，以及海滩对生态系统服务的价值。

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