Herbert Butterfield

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Extreme weather events can provide unique opportunities for testing models that predict the effect of climate change. Droughts of increasing severity have been predicted under numerous models, thus contemporary droughts may allow us to test these models prior to the onset of the more extreme effects predicted with a changing climate. In the third year of an(More)
The concept of the security dilemma engages with the existential uncertainty that lies in all human relations, and especially those taking place in the arena of international politics. The chapter argues that the security dilemma is a more fundamental concept for security studies than even war and strategy. After defining the meaning of the security(More)
Invasive weeds threaten the biodiversity and forage productivity of grasslands worldwide. However, management of these weeds is constrained by the practical difficulty of detecting small-scale infestations across large landscapes and by limits in understanding of landscape-scale invasion dynamics, including mechanisms that enable patches to expand,(More)
1. A rapid double antibody radioummunoassay method for the determination of plasma luteinizing hormone (hLH) is described. 2. The method involves preincubation of the anti-LH serum with the precipitating second antibody and incubation of this mixture with unknows and standards at room temperature overnight. The incubation tubes are then centrifuged,(More)
Species distributions are known to be limited by biotic and abiotic factors at multiple temporal and spatial scales. Species distribution models, however, frequently assume a population at equilibrium in both time and space. Studies of habitat selection have repeatedly shown the difficulty of estimating resource selection if the scale or extent of analysis(More)
Genomic responses to habitat conversion can be rapid, providing wildlife managers with time-limited opportunities to enact recovery efforts that use population connectivity information that reflects predisturbance landscapes. Despite near-complete biome conversion, such opportunities may still exist for the endemic fauna and flora of California's San(More)
BACKGROUND Carrizo Plain National Monument (San Joaquin Desert, California, USA) is home to many threatened and endangered species including the blunt-nosed leopard lizard (Gambelia sila). Vegetation is dominated by annual grasses, and shrubs such as Mormon tea (Ephedra californica), which is of relevance to our target species, the federally listed(More)
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