RNR 1001 Lecture : RNR Notes 006
Document Summary
Limiting factors- the presence, absence, or magnitude of biotic and abiotic environmental factors can limit population growth. Thresholds increase the chances of rapid environmental and ecological change. What we deal with as conservationists is the applied ecology of populations of species surrounded by environments living together in assemblages within communities within ecosystems. Any and all of these interactions and processes have been and will continue to be affected by anthropogenic. One constant that has accompanied the development of conservation as a science and social movement has been the steady increase in human population size. Populations grow and shrink based on the relative magnitude of four processes; birth, death, immigration and emigration. One way to look at birth rates is the total fertility rate(tfr), the number of theoretical births per woman during her lifetime, calculated by summing age-specific reproductive rates from 15-45 (49) Replacement tfr is about 2. 1 (industrialized), 2. 5-3. 3 (developing)
