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Bio Quarter 4 1
| Question | Answer |
|---|---|
| Population Density | the number of individuals that live in a given area |
| Population dispersion | the way the individuals in a population are arranged in space (uniform,random, clumped) |
| Surivorship curve | a diagram showing the number of surving members over time from a mesured set of births |
| immigration | the moving into a new place |
| emmigration | the leaving of a place |
| exponetial growth | when resources are abundant a population grows rapidly |
| Logestic growth | most populations face limited resources so growing at a constant slower place |
| Carrying Capcity | the maxium population size an eviroment can take |
| Limiting factor | physical or chemical and biological factors that restrain population growth |
| density dependent factor | Factors that can only effect a population when it reaches a certain density |
| What are density dependent factors | competiton, predation, disease, paratisim, crowding, and stress |
| density dependent factors | factors that can affect the population no matter what density |
| what are density independent factors | natural disaters,tempature, sunlight, human activites, physical characteristics, behaviours |
| Population crash | a dramtic decline in the size of a population over time |
| niche | an organism use of resources and its functional role in a community ( habitat) |
| Specialist | species with narrow niches and need specific requirments |
| Generalist | species with broad niches that can use a wide varity of resources |
| High population density = | easier to find mates increase in competiton |
| low population density = | harder to find mates but enjoy more resources |
| K-selected species | animals with long reproductive periods and off spring are large and live longer |
| r- strategist | animals who reproduce quickly but are short lives |
| what are the 3 factors the carrying capacity is based on | the amount of resources size of population amount of resources each individual is counsuming |
| what affects population size | amount of resources limiting factors birth and death rates immigration and emmigration |
| what are the 4 characteristics of population | size, density,dispersion,and carrying capacity |
Created by:
BB2424
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