Temporal and spatial variability, and the role of dissolved organic carbon (DOC) in methane fluxes from the Sabine River Floodplain (Southeast Texas, U.S.A.)

1996 ◽  
Vol 136 (2) ◽  
pp. 261-287
Author(s):  
Thomas S. Bianchi ◽  
Michael E. Freer ◽  
Robert G. Wetzel
2018 ◽  
Vol 28 (3) ◽  
pp. 493-510 ◽  
Author(s):  
Barry Taylor

Since the 1970s, research into Mesolithic landscapes has been heavily influenced by economic models of human activity where patterns of settlement and mobility result from the relationship between subsistence practices and the environment. However, in reconstructing these patterns we have tended to generalize both the modes of subsistence and the temporal and spatial variability of the environment, and ignored the role that cultural practices played in the way subsistence tasks were organized. While more recent research has emphasized the importance that cultural practices played in the way landscapes were perceived and understood, these have tended to underplay the role of subsistence and have continued to consider the environment in a very generalized manner. This paper argues that we can only develop detailed accounts of Mesolithic landscapes by looking at the specific forms of subsistence practice and the complex relationships they created with the environment. It will also show that the inhabitation of Mesolithic landscapes was structured around cultural attitudes to particular places and to the environment, and that this can be seen archaeologically through practices of deposition and recursive patterns of occupation at certain sites.


2005 ◽  
Vol 3 (2) ◽  
pp. 185-196 ◽  
Author(s):  
Elena N. Naumova ◽  
John Christodouleas ◽  
Paul R. Hunter ◽  
Qutub Syed

The goal of this study was to examine temporal and spatial variability of reported cryptosporidiosis in 15 health authorities in the North West of England using regression modelling. We also examined the role of precipitation as a driving factor for seasonal variation. We separated the time series of the reported cryptosporidiosis into two processes: an endemic process and an epidemic process, and examined the spatial variability of each of these processes. In the North West region of England we observed a strong seasonal pattern that consists of two waves, spring and autumn, during which the weekly rates exceeded the endemic level 3.5 and 3 times, respectively. Health authorities with the high endemic cryptosporidiosis incidence and well-pronounced seasonal patterns exhibited a significant increase in rates of cryptosporidiosis associated with increased precipitation. The endemic level and the magnitude of epidemic peaks were inversely related, which might be indicative of multiple exposures to the pathogen in these localities and the development of some partial immunity.


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