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Distribution of Diatoms in Relation to Land Use and pH in Blackwater Coastal Plain Streams

机译:黑水沿海平原溪流中硅藻的分布与土地利用和pH的关系

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We compared the composition of diatom assemblages collected from New Jersey Pinelands blackwater streams draining four different land uses, including forest land, abandoned-cranberry bogs, active-cranberry bogs, and developed and upland-agricultural land. Over a 2-year period (2002-2003), we collected 132 diatom taxa at 14 stream sites. Between-year variability in the composition of stream samples was high. Most diatom species were rarely encountered and were found in low abundance. Specific conductance and pH were higher at developed/agricultural sites compared with all other site types. Neither species richness nor genus richness was significantly different between stream types. However, clear community patterns were evident, and a significant difference in species composition existed between the developed/ agricultural sites and both cranberry and forest sites. The primary community gradient, represented by the first axis of a DCA ordination, was associated with variations in pH and specific conductance. Although community patterns revealed by ordinating the data collected in 2002 differed from those obtained using the 2003 data, both ordinations contrasted the developed/agricultural sites and the other sites. Acidobiontic and acidophilous diatoms characterized the dominant species at forest, abandoned-bog, and cranberry sites, whereas indifferent species dominated the developed/ agricultural samples. Although our study demonstrated a relationship between the composition of diatom assemblages and watershed conditions, several factors, including taxonomic problems, the large number of diatom species, incomplete pH classifications, and year-to-year variability may limit the utility of diatom species as indicators of watershed conditions in the New Jersey Pinelands.
机译:我们比较了从新泽西州派恩兰兹黑水溪流中收集的硅藻组合物的组成,这些河流排放了四种不同的土地用途,包括林地,废弃蔓越莓沼泽,活性蔓越莓沼泽以及发达和陆地农业土地。在2年中(2002-2003年),我们在14个河流站点收集了132个硅藻类群。溪流样品的年际变化很大。多数硅藻种类很少见,并且含量较低。与所有其他场所类型相比,发达/农业场所的比电导和pH值更高。溪流类型之间的物种丰富度和属丰富度都没有显着差异。然而,明显的群落格局是明显的,发达/农业用地与蔓越莓和森林用地之间物种组成存在显着差异。由DCA排序的第一个轴表示的主要群落梯度与pH值和比电导的变化相关。尽管通过整理2002年收集的数据揭示的社区模式与使用2003年数据获得的社区模式有所不同,但这两种方法都将发达/农业站点与其他站点进行了对比。嗜酸硅藻和嗜酸硅藻表征了森林,废弃沼泽和蔓越莓站点的优势物种,而无差异物种主导了发达/农业样品。尽管我们的研究表明了硅藻组合物的组成与分水岭条件之间的关系,但包括分类学问题,硅藻种类繁多,pH值分类不完整以及年际变化等多种因素可能会限制硅藻种类作为指标的实用性新泽西州派恩兰兹的分水岭状况。

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