The most perfect natural laboratory in the world: Making and knowing Hawaii National Park

This article reimagines the meanings of U.S. national parks and so-called 'natural' places in our environmental histories and histories of science. Environmental historians have created a compelling narrative about the creation and use of U.S. national parks as places for recreation and natural resource conservation. Although these motivations were undoubtedly significant, I argue that some of the early parks were created and used for a third, often overlooked, reason: to preserve a permanent, state-sanctioned space for scientific knowledge production. Deconstructing the concept of the "natural laboratory," I show how scientists helped justify and then benefited from the creation of national parks. Hawaii National Park serves as my case study. Advocates of the national park aimed to give settler colonial scientists in the Hawaiian archipelago a permanent place for their research, while tying Hawai'i's exotic landscape into the sublime nature of the American West. The park was framed as a perfect laboratory for U.S. experts to study "curious" flora, fauna, and geological processes, becoming a major site of knowledge production in volcanology. Reimagining the parks in this way has ramifications for how we think about issues of access and justice. Environmental historians who have explored the 'dark side' of the conservation movement have yet to consider the other half of the story: the parks not only barred certain peoples and their ways of life, but also provided access to scientists - a set of actors whose work was deemed more complementary to conservationist goals than the activities of the Native Hawaiians - and marginalized local and indigenous epistemologies. Thus, the question so often asked in environmental history, "Who is nature for?" might be supplemented by the question, "Who has the power to know nature?"

Quantification of the effects of ocean acidification on sediment microbial communities in the environment: the importance of ecosystem approaches

To understand how ocean acidification (OA) influences sediment microbial communities, naturally CO2-rich sites are increasingly being used as OA analogues. However, the characterization of these naturally CO2-rich sites is often limited to OA-related variables, neglecting additional environmental variables that may confound OA effects. Here, we used an extensive array of sediment and bottom water parameters to evaluate pH effects on sediment microbial communities at hydrothermal CO2 seeps in Papua New Guinea. The geochemical composition of the sediment pore water showed variations in the hydrothermal signature at seep sites with comparable pH, allowing the identification of sites that may better represent future OA scenarios. At these sites, we detected a 60% shift in the microbial community composition compared with reference sites, mostly related to increases in Chloroflexi sequences. pH was among the factors significantly, yet not mainly, explaining changes in microbial community composition. pH variation may therefore often not be the primary cause of microbial changes when sampling is done along complex environmental gradients. Thus, we recommend an ecosystem approach when assessing OA effects on sediment microbial communities under natural conditions. This will enable a more reliable quantification of OA effects via a reduction of potential confounding effects.

Climate relicts and their associated communities as natural ecology and evolution laboratories

Climate relicts, marginal populations that have become isolated via climate-driven range shifts, preserve ecological and evolutionary histories that can span millennia. Studies point to climate relicts as 'natural laboratories' for investigating how long-term environmental change impacts species and populations. However, we propose that such research should be expanded to reveal how climate change affects 'interacting' species in ways that reshape community composition and evolution. Biotic interactions and their community and ecosystem effects are often genetically based and driven by associations with foundation species. We discuss evolution in climate relicts within the context of the emerging fields of community and ecosystem genetics, exploring the idea that foundation relicts are also natural community and ecosystem laboratories and windows to future landscapes.