Question

1. compare classify each factor as having a positive impact or a negative impact on the growth rate of a population of organisms: birth rate, death rate, rate of immigration, rate of emigration.
2. summarize describe an ideal scenario where a population of organisms would achieve its biotic potential.
3. analyze data based on the death rates listed in the table, what type of survivorship curve do you expect the plant species will have?
4. predict what do you expect will be the survivorship between months 13 - 15?

the table gives statistics for a cohort of one plant species monitored over a year. use the data to answer questions 3 and 4.
age interval (months) survivorship (number surviving at start of interval) death rate birth rate
0 - 3 996 0.329 0
4 - 6 295 0.356 0
7 - 9 176 0.023 0
10 - 12 154 0.045 3.13

Explanation:

1.

Birth rate and rate of immigration add individuals to the population, increasing growth rate (positive impact). Death rate and rate of emigration remove individuals, decreasing growth rate (negative impact).

An ideal scenario for achieving biotic potential would be unlimited resources (food, space, water), no predators, no diseases, and optimal environmental conditions, allowing for maximum birth rates and minimum death rates.

The high death - rates in the early age intervals (0 - 3 and 4 - 6 months) followed by lower death - rates later suggest a Type III survivorship curve, where most mortality occurs early in life.

Answer:

Birth rate - positive impact; Death rate - negative impact; Rate of immigration - positive impact; Rate of emigration - negative impact

2.