By Cleveland P. Hickman Jr., Larry S. Roberts, Allan Larson
The 3rd variation of Animal range provides a survey of the animal nation with emphasis on variety, evolutionary relationships, sensible diversifications, and environmental interactions. it's adapted for a one-semester or one-quarter path and is acceptable for either non-science and technology majors.
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Although experimental populations of protozoa may ﬁt a logistic growth curve closely, most populations in nature tend to ﬂuctuate above and below carrying capacity. 7B). Why do intrinsically regulated populations oscillate this way? 7 Growth curves for sheep A, ring-necked pheasant B, and world human populations C throughout history. Note that the sheep population on an island is stable because of human control of the population, but the ring-necked pheasant population oscillates greatly, probably because of large changes in carrying capacity.
Population geneticists discovered principles by which genetic properties of populations change through time. A particularly important discovery, known as Hardy-Weinberg equilibrium, showed that Mendelian heredity does not change the genetic composition of populations. Important sources of evolutionary change include mutation, genetic drift, nonrandom mating, migration, natural selection, and their interactions. Mutations are the ultimate source of all new variation on which selection acts. Macroevolution comprises studies of evolutionary change on a geological timescale.
Many insects lay thousands of eggs each year. A single codﬁsh may spawn 6 million eggs in a season, and a ﬁeld mouse can produce 17 litters of ﬁve to seven young each year. Obviously, unrestricted growth is not prevalent in nature. Even in the most benign environment, a growing population eventually exhausts food or space. Exponential increases such as locust outbreaks or planktonic blooms in lakes must Hickman−Roberts−Larson: Animal Diversity, Third Edition © The McGraw−Hill Companies, 2002 Text chapter two Population size 38 2.
Animal Diversity by Cleveland P. Hickman Jr., Larry S. Roberts, Allan Larson