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Chapter 23

chapter 23


Department
Biological Sciences
Course Code
BIOC50H3
Professor
Marc Cadotte
Chapter
23

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CHAPTER 23
In Yellowstone Park, when wolves were eradicated, there were too many elk
which ate too much of the beavers desired food = scarce amount of beavers
Graphic Information Systems (GIS): helps in landscape planning, whether to
conserve or develop land
Global Positioning System (GPS): documents precise locations
Landscape Ecology: emphasizes on the causes and consequences of spatial
variation
Landscape: an area where at least one element is spatially
heterogeneous(varies from one place to another)
Mosaic: composite heterogeneous elements
Scale: spatial or temporal dimension of an object or process, characterized by
grain and extent
Grain: size of the smallest heterogeneous unit of study, determines resolution
at which we view the landscape (such as a pixel in a digital image)
Extent: the area or time period encompassed by a study
Landscape Composition: refers to the kind of elements or patches in a
landscape and how much of each is present
Landscape Structure: physical configuration of the different elements and
patches
Disturbances create heterogeneity and contribute to biodiversity
Habitat fragmentation is a reversible process
Spirochete bacterium causes lyme disease, ticks are vectors of lyme disease
Edge Effects: diverse biotic and abiotic changes associated with a boundary of
a patch, can serve as barriers or facilitators to dispersal , invasive species
more common here, known as biological traps
Habitat fragmentation increases rates of inbreeding and genetic drift
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