In ecology, a population is defined as a group of individuals (size N) from a species living in a specific area. Density and dispersion can vary based on organism behavior and resources. Populations can be counted by sampling, proxymeasure, and individual counting. Survivorship curves and age structure diagrams can be used to represent mortality, growth, expansion, and stability. Growth can take place exponentially at the biotic potential (maximum rate of growth under ideal conditions) or logistically when there are limiting factors. Growth strategies include r-selected and K-selected. R-selected or r-strategist species grow rapidly under ideal conditions. K-selected or K-strategist species (where K stands for carrying capacity) do not reproduce as often, but they provide more parenting and tend to do well in situations with limited resources.
A population is
a group of individuals from one species living in a given area.
the number of deaths per a given population or standardized
population size. A survivorship curve represents how the mortality
of the species varies with age.
potential is the maximum rate at which a given population could grow
under ideal conditions. Exponential growth is the type of growth a
population experiences under ideal conditions.
Capacity (K) is the maximum number of individuals that can occupy an
area under given conditions. The logistic model shows growth rate
from the time a population is introduced to an area to the time it
reaches its carrying capacity.
Growth Rate = r N (1 N / K)
species have rapid population growth when obstacles are limited.
They quickly reach carrying capacity. K-selected species tend
to dominate in stable, established environments.
Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.
The book and CD package include two full length practice exams that are presented with all questions answered and explained. The author also presents detailed reviews of all test topics and includes multiple-choice and free-response questions with answers at the end of each topic's chapter.
This book includes a review of the AP Biology exam format and scoring, proven strategies for answering multiple-choice questions, and hints for tackling the essay questions. The practice tests include answers and explanations and there is also proven test-taking strategies for both the multiple choice and essay parts.