One Environmental Health has emerged as an important area of research that considers the interconnectedness of human, animal and ecosystem health with a focus on toxicology. The great whales in the ...Gulf of Maine are important species for ecosystem health, for the economies of the Eastern seaboard of the United States, and as sentinels for human health. The Gulf of Maine is an area with heavy coastal development, industry, and marine traffic, all of which contribute chronic exposures to environmental chemicals that can bioaccumulate in tissues and may gradually diminish an individual whale's or a population's fitness. We biopsied whales for three seasons (2010–2012) and measured the levels of 25 metals and selenium in skin biopsies collected from three species: humpback whales (Megaptera novaeangliae), fin whales (Balaenoptera physalus), and a minke whale (Balaenoptera acutorostrata). We established baseline levels for humpback and fin whales. Comparisons with similar species from other regions indicate humpback whales have elevated levels of aluminum, chromium, iron, magnesium, nickel and zinc. Contextualizing the data with a One Environmental Health approach finds these levels to be of potential concern for whale health. While much remains to understand what threats these metal levels may pose to the fitness and survival of these whale populations, these data serve as a useful and pertinent start to understanding the threat of pollution.
•Gulf of Maine whales exhibited metal levels in their skin tissues.•Chromium levels in the whales were similar to levels reported in exposed workers.•Nickel levels in the whales were similar to levels reported in exposed workers.
Geographical range expansions of blacklegged tick Ixodes scapularis Say (Acari: Ixodidae) populations over time in the United States have been attributed to a mosaic of factors including 20th century ...reforestation followed by suburbanization, burgeoning populations of the white-tailed deer Odocoileus virginianus Zimmerman (Artiodactyla: Cervidae), and, at the northern edge of I. scapularis' range, climate change. Maine, a high Lyme disease incidence state, has been experiencing warmer and shorter winter seasons, and relatively more so in its northern tier. Maine served as a case study to investigate the interacting impacts of deer and seasonal climatology on the spatial and temporal distribution of I. scapularis. A passive tick surveillance dataset indexed abundance of I. scapularis nymphs for the state, 1990–2013. With Maine's wildlife management districts as the spatial unit, we used a generalized additive model to assess linear and nonlinear relationships between I. scapularis nymph abundance and predictors. Nymph submission rate increased with increasing deer densities up to ∼5 deer/km2 (13 deer/mi2), but beyond this threshold did not vary with deer density. This corroborated the idea of a saturating relationship between I. scapularis and deer density. Nymphs also were associated with warmer minimum winter temperatures, earlier degree-day accumulation, and higher relative humidity. However, nymph abundance only increased with warmer winters and degree-day accumulation where deer density exceeded ∼2 deer/km2 (∼6/mi2). Anticipated increases in I. scapularis in the northern tier could be partially mitigated through deer herd management.
One of the most pressing concerns of environmentalists and policy makers is the overexploitation of natural resources. Efforts to regulate such resources are too often undermined by the people whose ...livelihoods depend on their use. One of the great challenges for wildlife managers in the twenty-first century is learning to create the conditions under which people will erect effective and workable rules to conserve those resources. James M. Acheson, author of the best-selling Lobster Gangs of Maine (the seminal work on the culture and economics of lobster fishing), here turns his attention to the management of the lobster industry. In this illuminating new book, he shows that resource degradation is not inevitable. Indeed, the Maine lobster fishery is one of the most successful fisheries in the world. Catches have been stable since World War II, and record highs have been achieved since the late 1980s. According to Acheson, these high catches are due, in part, to the institutions generated by the lobster-fishing industry to control fishing practices. These rules are effective. Rational choice theory frames Acheson's down-to-earth study. Rational choice theorists believe that the overexploitation of marine resources stems from their common-pool nature, which results in collective action problems. In fisheries, what is rational for the individual fishermen can lead to disaster for the society. The progressive Maine lobster industry, lobster fishermen, and local groups have solved a series of such problems by creating three different sets of regulations: informal territorial rules; rules to control the number of traps; and formal conservation legislation. In recent years, the industry has successfully influenced new regulations at the federal level and has developed a strong co-management system with the Maine government. The process of developing these rules has been quite acrimonious; factions of fishermen have disagreed over lobster rules designed to give commercial advantage to one group or another. Although fishermen and scientists have come to share a conservation ethic, they often disagree over how to best conserve the lobster and even the quality of science. The importance of Capturing the Commons is twofold: it provides a case study of the management of one highly successful fishery, which can serve as a management model for policy makers, politicians, and local communities; and it adds to the body of theory concerning the conditions under which people will and will not devise institutions to manage natural resources.
Views from the dock McClenachan, Loren; Scyphers, Steven; Grabowski, Jonathan H.
Ambio,
01/2020, Letnik:
49, Številka:
1
Journal Article
Recenzirano
Odprti dostop
The ability of resource-dependent communities to adapt to climate change depends in part on their perceptions and prioritization of specific climate-related threats. In the Maine lobster fishery, ...which is highly vulnerable to warming water associated with climate change, we found a strong majority (84%) of fishers viewed warming water as a threat, but rank its impacts lower than other drivers of change (e.g., pollution). Two-thirds believed they will be personally affected by warming waters, but only half had plans to adapt. Those with adaptation plans demonstrated fundamentally different views of human agency in this system, observing greater anthropogenic threats, but also a greater ability to control the fishery through their own actions on the water and fisheries management processes. Lack of adaptation planning was linked to the view that warming waters result from natural cycles, and the expectation that technological advancements will help buffer the industry from warming waters.
We describe how the evolution of the licensing system for commercial fisheries in Maine has progressively limited the ability of both fishers and the State to respond to changing environmental ...circumstances. Over the twenty-five year period from 1990 to 2014 new licenses were created at the rate of about 0.6 per year. The changes that have occurred have not been the result of a strategic policy agenda that was set to decrease fishers access, but rather the consequence of multiple decades of policy interventions that have sought to improve the socioeconomic and ecological productivity of individual fisheries. However, the cumulative effect has limited the flexibility of individual fishers and created strong economic interests that are incompatible with shifts towards ecosystem-based management. We use this finding to contribute to the literature on resilience, with a specific focus on the relationship between adaptive management and sustainability.
•Growth rates of an Alexandrium catenella decrease at future temperature levels.•Growth rates of co-occurring non-toxic dinoflagellate competitors increase.•The findings suggest fewer future toxic ...blooms in the southern Gulf of Maine.•But more toxic blooms may occur in the northeastern Gulf of Maine.
Climate driven increases in ocean temperature and pCO2 have the potential to alter the growth and prevalence of future Harmful Algal Blooms (HABs), but systematic studies on how climate drivers influence toxic algal species relative to non-toxic phytoplankton are lacking. In particular, little is known about how future climate scenarios will affect the growth of the toxic dinoflagellate Alexandrium catenella, which is responsible for the paralytic shellfish poisoning (PSP) events that threaten the health and economy of coastal communities in the Gulf of Maine and elsewhere. The growth responses of A. catenella and two other naturally co-occurring dinoflagellates in the Gulf of Maine—Scrippsiella sp., and Amphidinium carterae—were studied in mono and mixed species cultures. Experimental treatments tested the effects of elevated temperature (20 °C), lower pH (7.8), and the combination of elevated temperature and lower pH on growth rates relative to those in near-current conditions (15 °C; pH 8.1). Growth rates of A. catenella decreased under elevated temperature and lower pH conditions, a response that was largely attributable to the effect of temperature. In contrast, growth rates of Scrippsiella sp. and A. carterae increased under elevated temperature and lower pH conditions, with temperature also being the primary driver of the response. These trends did not change substantially when these species were grown in mixed cultures (A. catenella + Scrippsiella sp., and A. catenella + A. carterae), indicating that allelopathic or competitive interactions did not affect the experimental outcome under the conditions tested. These findings suggest that A. catenella blooms may become less prevalent in the southern regions of the Gulf of Maine, but potentially more prevalent in the northeastern regions of the Gulf of Maine with continued climate change.
Most pollination in large-scale agriculture is dependent on managed colonies of a single species, the honey bee Apis mellifera. More than 1 million hives are transported to California each year just ...to pollinate the almonds, and bees are trucked across the country for various cropping systems. Concerns have been raised about whether such "migratory management" causes bees undue stress; however to date there have been no longer-term studies rigorously addressing whether migratory management is detrimental to bee health. To address this issue, we conducted field experiments comparing bees from commercial and experimental migratory beekeeping operations to those from stationary colonies to quantify effects on lifespan, colony health and productivity, and levels of oxidative damage for individual bees. We detected a significant decrease in lifespan of migratory adult bees relative to stationary bees. We also found that migration affected oxidative stress levels in honey bees, but that food scarcity had an even larger impact; some detrimental effects of migration may be alleviated by a greater abundance of forage. In addition, rearing conditions affect levels of oxidative damage incurred as adults. This is the first comprehensive study on impacts of migratory management on the health and oxidative stress of honey bees.
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