ArticleMarine ecology progress series2025
Three centuries of biogeochemical change in a temperate embayment as revealed by sediment core stable isotopes, radiometric dating, and historical ecology.
Article in Marine ecology progress series, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Efforts to improve water quality in urbanized embayments may be complicated by changes that predate contemporary ecological monitoring efforts. Such is the case in Wickford H arbor, Rhode Island, one of the oldest continuous settlements in the northeastern USA, that is exhibiting degraded water quality after centuries of land use change, physical modifications, and nutrient loading. Here, we used historical ecology and sediment geochemical records to discern the biogeochemical impacts of these anthropogenic forcings over time. Segmented linear regressions fitted to the radiometrically dated sediment cores found break points in the geochemical record that align with physical modifications in the 1800s and nutrient enrichment in the 1930s. Reductions in grain size and sorting over time suggest that railway construction in the late 1800s constrained the hydrodynamic flushing of the study system and is an important driver of current water quality. Ratios of bulk carbon, nitrogen, and phosphorus content are indicative of a system that has been persistently eutrophic. Indeed, bulk N isotope composition reflects a 5‰ increase in δ
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