The Secret Knowledge of Water : Discovering the Essence of by Craig Childs PDF

By Craig Childs

ISBN-10: 0316610690

ISBN-13: 9780316610698

Deserts are environments that may be inhospitable even to professional explorers. Craig Childs has spent years within the deserts of the yank West, and his treks via arid lands looking for water show the wildlife at its such a lot severe.

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Extra info for The Secret Knowledge of Water : Discovering the Essence of the American Desert

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The scale of the examples and ideas presented in this chapter will all be related to the degree of resolution one would find on, for example, a forestry map showing the different stand types or a map of agricultural fields as revealed from an aerial photograph. e. at a landscape ecological level in the sense that landscape changes originate from man's impact. 16 ECOLOGICAL PRINCIPLES OF NATURE CONSERVATION # 100 Vascu lar plants '"ill 'u ill a. '0" ;tI 80 60 I.. 0 E 40 j ~ z 20 o 0 '01 0 ·1 10 100 1000 Island area (HAl Fig.

4) How do edge-effects interact with the effects of area? ) (5) Are edge-effects multiplicative? Most seems to be known about predation as a kind of edge-effect. e. the quality gradient (2) The size. of the patch (3) The shape of the patch EDGES, SURROUNDINGS AND LANDSCAPE MOSAICS 37 (4) The type of prey and alternative prey (5) The type of predator; what is the 'sea' to one species may be the 'island' to another. Summarizing, predation as an edge-effect is a very important mechanism that may lead to: (1) Impoverishment of the bird fauna in small habitat patches (Ambuel & Temple, 1983, and subsequent papers along those lines).

However, as 28 ECOLOGICAL PRINCIPLES OF NATURE CONSERVATION will be seen from the many other kinds of edge-effects, such a strategy may in some situations actually threaten the biodiversity of the habitat patch we want to save, as, for example, by the invasion of successional plants and animals that interfere with species restricted to the older communities (Janzen, 1983, 1986). Edges may sometimes serve as corridors or pathways and facilitate movements along habitat borders (see also chapter 9).

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The Secret Knowledge of Water : Discovering the Essence of the American Desert by Craig Childs

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