Elucidating terrestrial nutrient sources to a coastal lagoon, Chincoteague Bay, Maryland, USA

摘要: Abstract Long-term non-linear ecosystem-scale changes in water quality and biotic communities coastal lagoons have been associated with intensification of anthropogenic pressures. In light incipient Johnson Bay (an embayment Chincoteague Bay, Maryland-Virginia, USA), examination nitrogen sources was conducted through synoptic monitoring, stable isotope signatures (δ15N) situ bioindicators, denitrification estimates. These data were placed the context long-term broader spatial analyses. Despite various watershed protection efforts, multiyear summer time studies (2004–2007) suggested that high levels terrestrially derived nutrients still enter Bay. Total concentrations 132% during late 1970s (mean 2004–2007 40.0 – 73.2 μM). Comparing total to St. Martin River (consistently most eutrophic region these bays), has increased from 62.5% 82.5% 1970s. Though specific inputs not yet definitively identified, increase occurred despite continued conservation measures. We suggest investigating nutrient can reveal potentially ineffective policies this knowledge be applied towards other lagoons.