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

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Abstract

Abstract 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.

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