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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Response of temperate intertidal benthic assemblages to mangrove detrital inputs
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Response of temperate intertidal benthic assemblages to mangrove detrital inputs

机译：温带潮间带底栖组合对红树林碎屑输入的响应

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Inputs of macrophyte detritus to soft-sediment habitats can be an important energy source regulating benthic community structure. In the tropics, mangrove detritus forms an essential food source for benthic invertebrates; however, it is unknown whether the same dependence occurs in temperate systems where mangrove detrital inputs to estuaries can be considerable. We investigated whether mangrove detrital deposition to temperate intertidal flats represents a cross-boundary subsidy of organic matter by structuring benthic macro-invertebrate communities on adjacent intertidal flats. To determine whether community responses to detrital deposition were spatially consistent, mangrove detritus was added (260 g m~(-2), equivalent to summer litter production) to two intertidal sites (with differing background sediment properties and macrofaunal community structure). Subsequent changes to the benthic macrofaunal community and sediment properties were monitored for 6 months following the addition. Benthic community responses to the detrital enrichment were similar at both sites; responses were subtle and involved only small changes in the relative abundances of a few dominant taxa (primarily a reduction in the numerically dominant spionids), rather than major shifts in community composition. The subtle response to such a relatively large detrital input suggests that mangrove detritus in temperate estuaries plays a minor role in shaping the communities on intertidal flats. We suggest that the slow decay (low bioavailability) and relatively low productivity of temperate mangroves result in communities that are less reliant on mangrove detritus, compared to those in the tropics where rapidly decaying mangrove detritus comprises the base of many food webs.
机译：将大型植物碎屑输入到软泥沙生境中可能是调节底栖生物群落结构的重要能源。在热带地区，红树林碎屑是底栖无脊椎动物的重要食物来源。然而，尚不清楚在温带系统中是否存在相同的依赖性，在温带系统中，红树林对河口的破坏性投入可能很大。我们通过在相邻的潮间带构造底栖大型无脊椎动物群落，调查了向温带潮间带的红树林碎屑沉积物是否代表有机质的跨境补贴。为了确定群落对碎屑沉积物的反应在空间上是否一致，在两个潮间带（具有不同的背景沉积物特性和大型动物群落结构）中添加了红树林碎屑（260 g m〜（-2），相当于夏季凋落物的产量）。添加后6个月，监测底栖大型动物群落的后续变化和沉积物特性。在两个地点，底栖生物群落对碎屑富集的反应相似。响应是微妙的，并且只涉及少数优势类群的相对丰度的微小变化（主要是数量上优势的spidids的减少），而不是群落组成的重大变化。对如此较大的碎屑输入的微妙反应表明，温带河口的红树林碎屑在形成潮间带群落的过程中起着较小的作用。我们建议与温带红树林碎屑构成许多食物网基础的热带地区相比，温带红树林的缓慢腐烂（低生物利用度）和相对较低的生产力导致社区对红树林碎屑的依赖性降低。

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