es_100_lecture_6-1

Decline even all with best reproductive values with

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Unformatted text preview: t…. D.T. AT current growth, survivorship and AT fecundity—very hard to reverse population decline decline Only those models where transitions in Only LARGEST SIZE CLASSES WERE INCREASED showed stable or increasing INCREASED population sizes ! population REDUCE ADULT MORTALITY SOURCES EXAMPLE 2: What controls rate of spread of invasive shrub Cytisus scoparius Cytisus (Scotch broom) ? (Scotch Ingrid Parker (UCSC): Ingrid •Shrub introduced to western USA from British Isles & N. Europe •Fixes nitrogen, changes whole ecosystem •Outcompetes native species •1-2 m tall shrub •Lives 10+ years 7 STAGES IN LIFE CYCLE In field measured In Seed production rates including success Seed of pollinators of Germination rates from soil seedbank Mortality rates of different age classes Growth rates among classes USED MATRIX MODELS TO CALCULATE RATE OF INCREASE FOR DIFFERENT POPULATIONS (Compared urban versus wildland populations) Findings: Findings: 1. 2. 3. NO one transition dominated population NO dynamics. S...
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This note was uploaded on 12/25/2009 for the course ENV S 100 taught by Professor Staff during the Fall '08 term at UCSB.

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