Terms : Hide Images
| 238907588 | immigration | organisms in a population moving into an area | |
| 238907589 | emigration | organisms in a population moving out of an area | |
| 238907590 | age structure | proportion of individuals in a population at various age ranges | |
| 238907591 | pre-reproductive | individuals not capable of reproducing | |
| 238907592 | reproductive | individuals capable of reproducing | |
| 238907593 | post-reproductive | individuals too old to be capable of reproducing | |
| 238907594 | intrinsic rate of increase (r) | how fast a population would grow under ideal conditions with no limiting factors or environmental resistance acting upon it | |
| 238907595 | environmental resistance | any factor (limiting factor) that can limit a populations growth; ex: amount of space, temperature, precipitation, disease, food availability | |
| 238907596 | biotic potential | capacity for growth; how well an organism can reproduce and get offspring out into the environment; ex: high biotic potential = fish, insects, small mammals like mice, etc.; low biotic potential = large mammals like the panda, elephants, rhinos, etc. | |
| 238907597 | carrying capacity (K) | maximum number of individuals an ecosystem can support for an extended period of time or indefinitely; determined by biotic potential of the organism and the environmental resistance factors that population faces | |
| 238907598 | exponential growth | rapid growth; doubling of population each generation; usually associated with intrinsic rate of increase (r); happens when organisms have very little environmental resistance factors or limiting factors acting upon them | |
| 238907599 | j-curve | exponential growth demonstrated by a population when it has few limiting factors or little environmental resistance acting upon it | |
| 238907600 | logistic growth | rapid explosive growth followed by decrease in population growth until population levels off | |
| 238907601 | s-curve | logistic growth, hovering slightly above and below the carrying capacity | |
| 238907602 | overshoot | exceeding the carrying capacity | |
| 238907603 | density-dependent population controls | Limiting factors have a greater effect as density increases Mostly Biotic Factors Competition for resources Predation Parasitism Infectious disease | |
| 238907604 | density-independent population controls | Limiting factor effects are not dependent on the size of the herd Mostly Abiotic Factors Weather/Climate Related Natural Disasters | |
| 238907605 | stable growth | population size fluctuates above and below carrying capacity Ex: undisturbed tropical rain forest | |
| 238907606 | irruptive growth | growth may explode, then crash Ex: seasonal insects | |
| 238907607 | cyclic growth | boom and bust cycles Ex: lynx and snowshoe hare; wolf-moose interactions Top-down population regulation Bottom-up population regulation | |
| 238907608 | irregular growth | no recurring pattern; often caused by catastrophic events like natural disasters or major habitat destruction that cannot be predicted | |
| 238907609 | asexual reproduction | Offspring are exact genetic copies (clones) of a single parent Examples: single-celled bacteria, corals, yeast, vegetative in plants | |
| 238907610 | sexual reproduction | two organisms mix genetic material so offspring is a combination of both | |
| 238907611 | r-selected species | reproduce quickly, high biotic potential, many offspring, little care to offspring; ex: insects (roaches), small mammals (mice, rats, rabbits), etc. | |
| 238907612 | K-selected species | reproduce slowly, low biotic potential, few offspring, a lot of care to offspring; ex: large mammals like elephants, panda, kangaroo | |
| 238907613 | late loss population survivorship curve | organisms in population live long life and often have few offspring but give offspring a lot of care; ex: large mammals | |
| 238907614 | constant loss population survivorship curve | organisms die off evenly at all ages throughout lifespan; ex: song birds | |
| 238907615 | early loss population survivorship curve | organisms in population die off at early ages, parents have many offspring but give little care to offspring; ex: fish, insects, etc. |
