You were then asked to respond to three questions: This is how you responded:
By the end of this lab, you should be able to: Describe the factors which affect population size. Explain why scientists use random sampling techniques to estimate the size of a population.
Distinguish between random, uniform, and clumped population distributions. Explain how age structure diagrams can help to predict changes in a population.
Distinguish between exponential and logistic growth. Distinguish between density-dependent and density-independent factors, providing examples for each.
Explain whether a species exhibits r-selected or K-selected growth. Apply population sampling techniques and calculations to human population dynamics. Background Information Population ecology plays an important role in helping to identify endangered species, and maintain biodiversity.
The study of population ecology looks at the factors that affect the growth and density of a population. Many of the concepts of population ecology can be applied to human population growth, which is one of the major challenges the earth faces today.
A population is a group of individuals of a species that are found within a specified location. A location could be contained to a small pond where researchers are studying a specific protozoan, or it could be an entire state where grizzly bears are being researched. The field of population ecology examines the factors that affect the size of a population.
The following factors affect the size of a population: The size of a population includes the total number of individuals present in a specified location at a particular time. Population size can vary considerably over time, sometimes even seasonally with some species.
The number of individuals in a population per unit area or volume is called the population density. High population density may seem to be ideal; however, overcrowding can lead to increased prevalence of diseases and parasites, as well as increased vulnerability to predators that can ultimately cause a steep, rapid decline in the size of a population.
In examining population densities, biologists are able to determine. This information, in turn, can provide information regarding the environment and whether factors like available resources are changing. For example, if a food source has diminished due to drought, the carrying capacity maximum population that a given area can support will be negatively affected.
Biologists that determine the size of a given population face several challenges. For example, it is usually impractical for scientists to count an entire population; in some situations, there may be far too many individuals to count them all, or in other situations, environmental factors may make it difficult to count an entire population.
For instance, the terrain may be very rugged or the animals being studied may clump together in groups or may be difficult to locate. Because of these limitations, scientists normally estimate the size of a population by taking a random sample of individuals in the population and then extrapolating the size of the entire population based on that sample.
The distribution of a population across or within a given location is also important in studying population dynamics.
There are three types of spatial distributions, as seen in the image below. A random distributionis one where individuals are located throughout the location, in no particular pattern.
A uniform distributionis one where individuals are evenly spaced throughout the location and is typical of organisms that compete for space.
Finally, a clumped distribution details a distribution where individuals occur in patches around resources needed for survival. This is called the sex ratio.
If the species is monogamous, meaning individuals only take a single mate, the ideal sex ratio is one male to every one female. If a species relies on this ratio and an extraneous variable reduces the numbers of one sex, it could negatively impact the population.Dry Lab for the Genetics lab week 3 BIOS 1.
Explain in essay format what is meant by dominant and recessive traits. Please give an example of this from within your own family (human traits that are dominant/ recessive). (Use a punnet square for this trait showing the two parents and 4 possible offspring traits.
2. Look up the Biological. Bio lab kit for Rio Salado Bio lab kit for Rio Salado. BIO Great Experiments in Biology, Lab Manual Labratory Manual to Accompany “Great Experiments in Biology” Alyssa Pedersen-Shear, Meg Bentley, Sarah Frances-Knight, Nancy Zeller, Kathryn Walters-Conte American University Washington D.C.
BIO Assignment Schedule 8 Week_FLEX 4 pages. BIO LESSON 8 BIO Essay 1. 5 pages.
BIO Essay 5 Rio Salado Community College Biology concepts Lab Report 1-N. 4 pages. Selective Herbicides Lab Report Rio Salado Community College Biology concepts.
Welcome to BIO Introduction to Molecular and Cellular Biology. This course is intended for the student interested in understanding and appreciating common biological topics in the study of the smallest units within biology: molecules and cells.
Molecular and cellular biology is a dynamic field. Study Minnesota State University, Mankato Biology flashcards and notes.
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