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首页> 外文期刊>Estuarine Coastal and Shelf Science >The Southwest Atlantic intertidal burrowing crab Neohelice granulata modifies nutrient loads of phreatic waters entering coastal area
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The Southwest Atlantic intertidal burrowing crab Neohelice granulata modifies nutrient loads of phreatic waters entering coastal area

机译：西南大西洋潮间洞穴蟹新螺旋藻改变了进入沿海地区的潜水水的营养负荷

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摘要

Along the coastal areas of the Southwest Atlantic estuaries and embayments, phreatic water often circulates through very extended areas (up to several hundred meters perpendicular to the coast), dominated by dense assemblages of deep burrows of the crab Neohelice granulata (formerly Chasmagnathus granulatus). This crab inhabits the intertidal area, from mudflats to marshes vegetated by species of Spartina, Sarcocornia and Juncus, generating extensive burrowing beds where burrow density may reach up to 60 burrows m~(-2). Since the lower limit of the crab burrows is usually the water table, we investigated through field experiments the effect of N. granulata and their burrows on the chemical characteristics of this phreatic water. Water analysis from experimental (1) occupied burrows (with crabs), (2) unoccupied burrows (where crabs were excluded), and (3) sediment pore water show remarkable differences. Water oxygenation, and nitrate, ammonium and sulphate concentrations inside occupied burrows were higher than in the water inside unoccupied burrows or pore waters. Moreover, directed sampling of phreatic water entering and leaving the crab bed, shows that dissolved inorganic nitrogen concentration is enhanced as the water crosses the crab bed. These results may be ascribed to the fact that in the salt marsh the crabs spend most of their time within burrows, where presumably they store food (plants) and defecate. These activities generate an area of accumulation of excrements and nutrients in different decomposition states. The present work shows a novel way by which bioturbating organisms can affect nutrients exportation from salt marshes to the open waters.
机译：沿着西南大西洋河口和河口的沿海地区，潜水水经常在非常宽广的区域（垂直于海岸几百米）中循环，主要由蟹类新鳞片（以前称为Chasmagnathus granulatus）的深洞穴组成。该螃蟹栖息于潮间带，从泥滩到由斯巴迪娜，Sarcocornia和Juncus物种所植被的沼泽，形成了广泛的穴床，穴位密度可高达60穴m〜（-2）。由于螃蟹洞穴的下限通常是地下水位，因此我们通过田间试验研究了颗粒猪笼草及其洞穴对这种潜水水的化学特性的影响。实验（1）有人居住的洞穴（有螃蟹），（2）没有有人居住的洞穴（不包括螃蟹）和（3）沉积物孔隙水的水分析显示出显着差异。水的含氧量，被占领的洞穴内的硝酸盐，铵和硫酸盐浓度高于未被占领的洞穴或孔隙水中的水。此外，直接取样进入和离开蟹床的潜水水表明，当水穿过蟹床时，溶解的无机氮浓度会增加。这些结果可能归因于这样的事实，即在盐沼中，螃蟹大部分时间都在洞穴中度过，大概是它们在那里储存食物（植物）并排便。这些活动在不同的分解状态下产生了一个排泄物和营养物质积聚的区域。目前的工作表明了一种新的方式，生物扰动生物可以通过这种方式来影响从盐沼到露天水域的养分输出。

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