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Benthic studies in upper Buzzards Bay, Massachusetts: 2011/12 as compared to 1955

机译：马萨诸塞州上巴扎德斯湾的底栖动物研究：与1955年相比，2011/12年

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摘要

Precise biodiversity mapping that can be compared over decades would greatly inform the discussion of climate change impacts on species richness and shifts in dominant benthic species. Buzzards Bay, Massachusetts, USA, has a long history of field studies documenting benthic community structure. This bioassessment compares 1955 benthic infaunal sampling results with 2011/2012 samples to determine whether there has been a compositional change. I also compared structural components including grain size and near-bottom temperatures. In addition, benthic temperature rise and fall was logged at 15-min intervals from May to October of consecutive years. There was an observed difference in the benthic compositional structure, substrate and temperature between the 1955 and 2011/2012 station conditions. The 1955 identification of Buzzards Bay as being nutrient poor and having a reported 20.5°C benthic temperature maximum has changed. Coastal development has brought increased nutrient inputs, and the 2012 bottom temperature maximum was at least 4°C greater. These conditions contribute to shifts in benthic species dominance, and the substrate itself has been transformed to shell reefs at the stations where the gastropod Crepidula fornicata proliferated.
机译：可以在数十年间进行比较的精确的生物多样性制图将极大地推动有关气候变化对物种丰富性和主要底栖物种转移的影响的讨论。美国马萨诸塞州的巴扎德斯湾（Buzzards Bay）有很长的实地研究历史，记载了底栖动物群落结构。这项生物评估将1955年底栖动物的粪便采样结果与2011/2012年样本进行了比较，以确定是否发生了成分变化。我还比较了包括晶粒尺寸和接近底部温度在内的结构成分。另外，连续5月至10月，底栖温度的上升和下降间隔为15分钟。在1955年和2011/2012年的站位条件之间，底栖成分结构，基底和温度存在明显差异。 1955年，对秃鹰湾的营养缺乏和据报道底栖温度最高达到20.5°C的情况发生了变化。沿海地区的发展带来了更多的养分投入，2012年的底部最高温度至少升高了4°C。这些条件导致底栖物种优势的转移，底物本身已在腹足纲Cripidula fornicata繁殖的位置转变成贝壳礁。

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