Ecology Worksheet Fredericksburg City Schools生态表弗雷德里克斯堡市的学校.pptVIP

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Ecology Worksheet Fredericksburg City Schools生态表弗雷德里克斯堡市的学校.ppt

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Ecology Worksheet Chapters 5 and 6 1) Name the 3 important characteristics of a population: Geographic distribution Density Growth rate 2)__________of the # of individuals per unit area. Population density 3) What can affect population density? Species ecosystem 4) What factors can affect population size? Number of births Number of deaths Number of individuals that enter or leave a population 5) Compare immigration and emigration. Immigration is the movement of individuals into an area and emigration is movement OUT OF an area. Immigration can cause a population to grow while emigration can cause a population to decrease .Searching for mates ,changes in resources and food can affect both. 6) What is exponential growth? Occurs when the individuals in a population reproduce @ a constant rate….@ first they increase slowly , but eventually they increase approaching an indefinitely large size—This is in the absence of predation and presence of unlimited resources 7)When will a population grow exponentially? Under ideal conditions with unlimited resources 8)What is logistic growth and how does that differ from exponential growth? As resources become less available,the growth slows or stops….This generally is an s-shaped curve….and occurs following a time of exponential growth---Exponential growth occurs @ ideal conditions only. 9) Define carrying capacity. The largest number of individuals that a given environment can support 10) What factors may cause carrying capacity to change? Natural disasters,resources limited.. 11)Do analyzing data on p. 123 2) Logistic growth in fruit fly population and exponential growth in rabbits .Limiting factors must have affected fruit fly population, but not rabbits. 3)The graph of fruit flies seems to have reached carrying capacity @ 35 days,where 320 individuals are supported. 4)w/ predators added,the rabbits would show logistic growth,and population would slow or decrease 12. What are limiting factors and give examples. Can cause a popu