Stephen Tomasetti

Hamilton College · Department of Environmental Studies

A large number of coastal ecosystems globally are subjected to concurrent hypoxic and acidified conditions that will likely intensify and expand with continued climate change. In temperate regions, the spawning of many important organisms including the Atlantic blue crab Callinectes sapidus occurs during the summer months when the severity of coast...

Changes in human population centers and agricultural fertilizer use have accelerated delivery rates of nitrogen and phosphorus to coastal waters, often stimulating rapid accumulations of primary production. Whereas resulting eutrophication processes are of less environmental relevance in well-mixed, ocean ecosystems, when they occur in warm, strati...

Many shallow coastal systems experience diel fluctuations in dissolved oxygen (DO) and pH that can intensify throughout the summer season and expose estuarine organisms to repeated episodes of coastal hypoxia and acidification. In temperate regions, larval release of the economically important blue crab Callinectes sapidus occurs in the summer, and...

During the past century, bivalve populations across the globe have collapsed, resulting in negative ecosystem consequences due to their outsized impact on shallow estuaries. In response, there has been strong interest in the restoration of marine bivalve populations. Here, we present a decade-long restoration effort that sought to rebuild a collaps...

Warming temperatures and diminishing dissolved oxygen (DO) concentrations are among the most pervasive drivers of global coastal change. While regions of the Northwest Atlantic Ocean are experiencing greater than average warming, the combined effects of thermal and hypoxic stress on marine life in this region are poorly understood. Populations of t...

Harmful algal blooms (HABs) are recurrent in the NW Patagonia fjords system and their frequency has increased over the last few decades. Outbreaks of HAB species such as Alexandrium catenella, a causal agent of paralytic shellfish poisoning, and Protoceratium reticulatum, a yessotoxins producer, have raised considerable concern due to their adverse...

Coastal zones can be focal points of acidification where the influx of atmospheric CO2 can be compounded by additional sources of acidity that may collectively impair calcifying organisms. While the photosynthetic action of macrophytes may buffer against coastal ocean acidification, such activity has not been well-studied, particularly among aquacu...

In recent decades, the alteration of coastal food webs (via aquaculture, fishing, and leisure activities), nutrient loading, and an expansion of monitoring programs have prompted an apparent worldwide rise in Harmful Algae Blooms (HABs). Over this time, a parallel increase in HABs has also been observed in the Chilean southern austral region (Patag...

Larval survival data. (XLSX)

Experiments one, two, and three: Two-way analysis of variance for Callinectes sapidus larval survival when exposed to two levels of DO and pH for 14 days. (DOCX)

Mean pH, carbonate chemistry, alkalinity, DO, temperature and salinity (± 1 SD) during experiments one, two, and three in which larval stage Callinectes sapidus were exposed to differing levels of pH and DO achieved via mixing tanked gases. (DOCX)

Mean pH, carbonate chemistry, alkalinity, DO, temperature and salinity (± 1 SD) during experiments four and five in which larval stage Callinectes sapidus were exposed to differing levels of pH and DO achieved via mixing tanked gases. (DOCX)

Experiments four and five: Two-way analysis of variance for Callinectes sapidus larval survival when exposed to two levels of DO and pH for 4 days. (DOCX)

Logistic, 3-parameter nonlinear regression for Callinectes sapidus larval survival when exposed to varying levels of DO for a period ≤ 4 days; Regression Equation: y = a / [1 +(x/x0)b]. (DOCX)

Linear regression for Callinectes sapidus larval survival when exposed to varying DO levels for 14 days; Regression Equation: y = 0.109x – 4.554. (DOCX)

Linear regression for Callinectes sapidus larval survival when exposed to varying pH levels for 14 days; Regression Equation: y = 16.325x – 108.96. (DOCX)