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4 results for “nutrient pollution”
Are Tidal Salt Marshes Exposed to Nutrient Pollution more Vulnerable to Sea Level Rise?
<p>Over the past four decades, Long Island, NY, USA, has lost coastal wetlands at a rate of 4% per decade due to submergence. In this study, we examined relationships between the rate of tidal salt marsh loss and environmental factors, including marsh elevation, tidal range, and wastewater exposure through analysis of stable isotope ratios of marsh soils and biota. Our goal was to identify factors that increase vulnerability of marshes to sea level rise, with a specific emphasis on the potential role of poor water quality in hastening marsh loss. Our results suggest that wastewater exposure may accelerate loss of intertidal marsh, but does not negatively impact high tidal marsh resilience to sea level rise. And while marsh elevation and tidal range were statistically significant predictors of marsh loss, they similarly displayed opposite relationships among marsh zones. This study suggests that different functional zones of coastal salt marshes may not respond similarly to global change factors, and that elevation may be an important factor mediating eutrophication effects to coastal salt marshes.</p>
Data from: Nutrient pollution disrupts key ecosystem functions on coral reefs
There is a long history of examining the impacts of nutrient pollution and pH on coral reefs. However, little is known about how these two stressors interact and influence coral reef ecosystem functioning. Using a six-week nutrient addition experiment, we measured the impact of elevated nitrate (NO3) and phosphate (PO43) on net community calcification (NCC) and net community production (NCP) rates of individual taxa and combined reef communities. Our study had four major outcomes: 1) NCC rates declined in response to nutrient addition in all substrate types; 2) the mixed community switched from net calcification to net dissolution under medium and high nutrient conditions; 3) nutrients augmented pH variability through modified photosynthesis and respiration rates; and 4) nutrients disrupted the relationship between NCC and aragonite saturation state documented in ambient conditions. These results indicate that the negative effect of NO3 and PO43 addition on reef calcification is likely both a direct physiological response to nutrients and also an indirect response to a shifting pH environment from altered NCP rates. Here, we show that nutrient pollution could make reefs more vulnerable to global changes associated with ocean acidification and accelerate the predicted shift from net accretion to net erosion.
Are Tidal Salt Marshes Exposed to Nutrient Pollution more Vulnerable to Sea Level Rise?
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Data from: Nutrient pollution disrupts key ecosystem functions on coral reefs
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