Laserfiche WebLink
¦ Males <br />® Females <br />80 <br />60 <br />ca <br />40 <br />c <br />a? <br />a? <br />a <br />20 <br /> <br />Winter Spring <br />Figure 2. Percentage of male and female adult voles within total vole population on small (S), <br />medium (M), and large (I,) patches for winter and spring seasons. Data were pooled for all seven <br />years. <br />of fragmentation apparent in one species (e.g., a competitive dominant) may <br />indirectly reflect the impact of fragmentation on another species (e.g., a com- <br />petitive subordinate); and <br />(3) Sink populations may contribute to the total number of individuals in an area <br />and retard species' extinctions from fragmented habitats, but the species' chances <br />of going extinct through stochastic processes are high due to poor-quality habitat. <br />Because fragmentation is likely to produce source/sink structures, the total size <br />of a population may be a poor index of how vulnerable a species is to further <br />habitat degradation. <br />Population Processes ? 259 <br />S M L S M L