A new set of N isotopic reference values for monitoring Ulva green tides in coral reef ecosystems

Nitrogen isotopes in herbaria document historical nitrogen sewage pollution in the Mersey Estuary, England

“…δ 15 N values are consistently more elevated with the lowest value at +12.8‰ and the highest value of +22.8‰. 34,69 Elevated δ 15 N values >+16‰ are rarely recorded in macroalgae studies 45,74 (Gröcke et al , unpub. data), and only a handful of studies have recorded values >20‰, 21,25,45,74 and none previously in the UK.…”

“…34,69 Elevated δ 15 N values >+16‰ are rarely recorded in macroalgae studies 45,74 (Gröcke et al , unpub. data), and only a handful of studies have recorded values >20‰, 21,25,45,74 and none previously in the UK. Although BOD assessments indicate that the Mersey Estuary has improved, the Environment Agency reports that it is “not achieving good status” due to industry, 63 with no indication of water detriment from the water industry.…”