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149 result(s) for "Becker, Dana"
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Regional reef fish assemblage maps provide baseline biogeography for tropicalization monitoring
The Anthropocene rise in global temperatures is facilitating the expansion of tropical species into historically non-native subtropical locales, including coral reef fish. This redistribution of species, known as tropicalization, has serious consequences for economic development, livelihoods, food security, human health, and culture. Measuring the tropicalization of subtropical reef fish assemblages is difficult due to expansive species ranges, temporal distribution shifts with the movement of isotherms, and many dynamic density-dependent factors affecting occurrence and density. Therefore, in locales where tropical and subtropical species co-occur, detecting tropicalization changes relies on regional analyses of the relative densities and occurrence of species. This study provides a baseline for monitoring reef fish tropicalization by utilizing extensive monitoring data from a pivotal location in southeast Florida along a known transition between tropical and subtropical ecotones to define regional reef fish assemblages and use benthic habitat maps to spatially represent their zoogeography. Assemblages varied significantly by ecoregion, habitat depth, habitat type, and topographic relief. Generally, the southern assemblages had higher occurrences and densities of tropical species, whereas the northern assemblages had a higher occurrence and density of subtropical species. A total of 108 species were exclusive to regions south of the Bahamas Fracture Zone (BFZ) (South Palm Beach, Deerfield, Broward-Miami) and 35 were exclusive to the north (North Palm Beach, Martin), supporting the BFZ as a pivotal location that affects the coastal biogeographic extent of tropical marine species in eastern North America. Future tropicalization of reef fish assemblages are expected to be evident in temporal deviance of percent occurrence and/or relative species densities between baseline assemblages, where the poleward expansion of tropical species is expected to show the homogenization of assemblage regions as adjacent regions become more similar or the regional boundaries expand poleward. Ecoregions, habitat depth, habitat type, and relief should be incorporated into the stratification and analyses of reef fish surveys to statistically determine assemblage differences across the seascape, including those from tropicalization.
One Nation Under Stress
Everyone is talking about stress. From 1970 to 1980, 2,326 academic articles appeared with the word “stress” in the title. In the decade between 2000 and 2010 that number jumped to 21,750. Has life become ten times more stressful, or is it the stress concept itself that has grown exponentially over the past forty years? This book argues that our national infatuation with the therapeutic culture has created a middle-class moral imperative to manage the tensions of daily life by turning inward, ignoring the social and political realities that underlie those tensions. The book shows that although stress is often associated with conditions over which people have little control—workplace policies unfavorable to family life, increasing economic inequality, war in the age of terrorism—the stress concept focuses most of our attention on how individuals react to stress. A proliferation of self-help books and dire medical warnings about the negative effects of stress on our physical and emotional health all place the responsibility for alleviating stress-though yoga, deep breathing, better diet, etc.—squarely on the individual. The stress concept has come of age in a period of tectonic social and political shifts. Nevertheless, we persist in the all-American belief that we can meet these changes by re-engineering ourselves rather than tackling the root causes of stress. Examining both research and popular representations of stress in cultural terms, the book traces the evolution of the social uses of the stress concept as it has been transformed into an all-purpose vehicle for defining, expressing, and containing middle-class anxieties about upheavals in American society.