985 resultados para Decisional latitude
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Three pages at end contain a publishers' advertisement.
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Mode of access: Internet.
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Mode of access: Internet.
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Translation of: An estimate of the temperature of different latitudes.
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Master microform held by: IDC.
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Campbell 10. First issue with plates dated 1826.
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Preface signed: Nevil Maskelyne, astronomer royal.
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Mode of access: Internet.
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Appendix to chapter XIII "Anthropology," and to chapter XIV "Pygmies and forest negroes," by Dr. F. Shrubsall.
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"The plan of arrangement and scope of these tables, as well as the method of using them in navigation, were conceived by Mr. G.W. Littehales, C.E. Hydrographic office, Washington D.C."--Pref., p.iii.
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Mode of access: Internet.
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Thesis (Ph.D.)--University of Washington, 2016-06
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Environmental conditions influence the breeding and migratory patterns of many avian species and may have particularly dramatic effects on long-distance migrants that breed at northern latitudes. Environment, however, is only one of the ecological variables affecting avian phenology, and recent work shows that migration tactics may be strongly affected by changes in predator populations. We used long-term data from 1978 to 2000 to examine the interactions between snowmelt in western Alaska in relation to the breeding or migration phenologies of small shorebirds and their raptor predators. Although the sandpipers' time of arrival at Alaskan breeding sites corresponded with mean snowmelt, late snowmelts did delay breeding. These delays, however, did not persist to southward migration through British Columbia, likely due to the birds' ability to compensate for variance in the length of the breeding season. Raptor phenology at an early stopover site in British Columbia was strongly related to snowmelt, so that in years of early snowmelt falcons appeared earlier during the sandpipers' southbound migration. These differential effects indicate that earlier snowmelt due to climate change may alter the ecological dynamics of the predator-prey system.