Skip to main content Accessibility help

We use cookies to distinguish you from other users and to provide you with a better experience on our websites. Close this message to accept cookies or find out how to manage your cookie settings.

Close cookie message
×
  1. Home
  2. Search

Refine search

Refine search

Access:
Content type:
Publication date:
Apply   From and To filters
Subject: Show more
Journals Show more
Publishers: Show more
Societies Show more
Series: Show more
Collections: Show more

Actions for selected content:

Select all | Deselect all
  • View selected items
  • Export citations
  • Download PDF (zip)
  • Save to Kindle
  • Save to Dropbox
  • Save to Google Drive

Save Search

You can save your searches here and later view and run them again in "My saved searches".

Please provide a title, maximum of 40 characters.
Cancel
×

2 results

  • Spatial clustering and longitudinal variation of Anopheles darlingi (Diptera: Culicidae) larvae in a river of the Amazon: the importance of the forest fringe and of obstructions to flow in frontier malaria

  • F.S.M. Barros, M.E. Arruda, H.C. Gurgel, N.A. Honório
  • Journal:
    Bulletin of Entomological Research / Volume 101 / Issue 6 / December 2011
    Published online by Cambridge University Press:
    01 July 2011, pp. 643-658

  • Deforestation has been linked to a rise in malaria prevalence. In this paper, we studied longitudinally 20 spots, including forested and deforested portions of a temporary river in a malarigenous frontier zone. Larval habitat parameters influencing distribution of Anopheles darlingi (Diptera: Culicidae) larvae were studied. We observed that larvae were clustered in forested-deforested transitions. For the first time in the literature, it was verified that parameters determining larval distribution varied from deforested to forested areas. The proximity to human dwellings was also a significant factor determining distribution, but larvae was most importantly associated with a previously undescribed parameter, the presence of small obstructions to river flow, such as tree trunks within the river channel, which caused pooling of water during the dry season (‘microdams’). In deforested areas, the most important factor determining distribution of larvae was shade (reduced luminance). Larvae were absent in the entire studied area during the wet season and present in most sites during the dry season. During the wet-dry transition, larvae were found sooner in areas with microdams, than in other areas, suggesting that flow obstruction prolongs the breeding season of An. darlingi. Adult mosquito densities and malaria incidence were higher during the dry season. Our data correlate well with the published literature, including the distribution of malaria cases near the forest fringes, and has permitted the creation of a model of An. darlingi breeding, where preference for sites with reduced luminance, human presence and microdams would interact to determine larval distribution.

  • 27 - The Frontier Zones

  • from Part VII - Regional Development in the Roman Empire
  • Edited by Walter Scheidel, Stanford University, California, Ian Morris, Stanford University, California, Richard P. Saller, Stanford University, California
  • Book:
    The Cambridge Economic History of the Greco-Roman World
    Published online:
    28 March 2008
    Print publication:
    29 November 2007, pp 720-740

  • Summary

    It has often been remarked that the location of the frontier lines of the Roman empire coincided roughly with the outer perimeter of the provincial territory that was occupied by peoples whose social structure was easily adapted to the Roman administrative system. Any significant measure of economic growth in the frontier zones could have been achieved only by improving agricultural efficiency or by expanding the amount of land under cultivation. There is in fact little reason to doubt that agricultural output was increased in at least some of the frontier zones, like the Rhineland, where more intensive cultivation is attested in the lower Mosel-Main, the Wetterau, and the agri decimates. Parts of northern Gaul were given over to the production of cereals for the army stationed on the Rhine. The absence of local produce among some of the frontier garrisons may have led to an increase in trade across the frontiers.