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Biology 9 ecology 2
the second intro to ecology
| Question | Answer |
|---|---|
| What is mutualistic? | When both organisms benefit from the relationship. |
| What is commensalistic? | When only one organism benefits from the relationship. |
| What is population ecology? | It is the study of groups within a species and how they live together in one geographic area. |
| What are the three stages of demographic transition? | 1.birth rates > deaths rates 2.birth rates = death rates 3.birth rates < deaths rates |
| What is the relationship between population size and competition? | The bigger the population the more competition there will be for resources. |
| What is the difference from legistic and exponential growth? | Legistic: limited to the caring capacity (rhino) density dependent Exponential: proportionally (mosquito)density independent |
| Why do population in different countries grow at different rates. | Birth rates, death rates and age structure |
| What kind of conditions might prevent a community to change back to its preserved state? | Natural disasters, and man made disturbances |
| Would an intro to an extinct species be considered independent or depend density? | It would be independent |
| What is niche? | The role of an organism |
| What is limiting factors? | What is keeping growth in check |
| What are some examples of limiting factors? | Space,temperature,mates, and food. |
| How can a population increase? | By birth and immigration |
| How can a population decrease ? | By death and emigration |
| How does geography play a role in population ecology? | It affects which and how many organism come in contact and who the organism will be in competition for mates,food,space, and ect. |
| What is a symbiosis ? | Any relationship in which 2 species live closely together. |
| What is parasitism? | Similar to predation, when one species lives on or causes harm to the significant other. |
| What is commensalism? | When one species benefits while the other isn't affected. (A bird and a tree) |
| What is community ecology? | Groups of different organism that live together and how they affect each other |
| What is ecosystem ecology? | The study of all living and non living organisms interact within the entire ecosystem. |
| What is fecundity? | How many offspring an individual can have in a lifetime. |
| What is caring capacity? | The # of individuals an area can sustain with the resources available |
| What is density independent? | When a cruel aspect changes enough that it makes it harder to get by. |
| What is density dependent? | Factors that inhabit growth because of inviromental stress caused by population size. |
| What are some causes of plateau in legistic growth ? | The caring capacity, they ran out of food or space. |
| How do you calculate the growth rate? | You subtract the number of death from the number of birth rates and divide by the initial population size |
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