Class Notes (811,170)
United States (314,506)
BSC 108 (56)
Lecture 23

BSC 108 Lecture 23: Chapter 18 In-class notes

5 Pages
Unlock Document

University of Alabama
Biological Sciences
BSC 108
Christine J.Yates

Chapter 18 In-class notes Ecology and biosphere • introduction o Periodic fires change the ecological communities o The biosphere is currently undergoing a mass of extinction o Your body will begin to produce More red blood • overview: o Ecology ▪ The scientific study of the interaction between organisms and their environment o The environment ▪ Can be divided into two major components • The abiotic component o Non-living chemical and physical factors in an environment • The biotic component o The living factor in an environment o Natural history as a “discovery science” remains fundamental to ecology • Hierarchy of interaction: o Organismal o Populations o Community o Ecosystem • Organismal ecology o Concerned with evolutionary adaptions ▪ that enable individual organisms to meet the challenged posed by their abiotic environments o Individual level o • Populations ecology o Concerned with populations ▪ Population: • Groups of the same species living in the same area o Concentrates mainly on factor that affect populations density and growth • Community ecology o Concerned with community ▪ Community: • Assemblages of populations of different species ▪ Focuses on how interaction between species affect community structure and organization • ecosystem ecology o concerned with ecosystem ▪ which include all the abiotic factors in addition to the community of species in a certain area o focuses on energy flow and the cycling of chemical among the various abiotic and biotic factors • • the biosphere: o the global ecosystem • global distribution patterns: o reflect regional differences in climate and other abiotic factors ▪ patchiness of the environment on a local scale reveals a mixture of characteristics • Habitats: o Specific environments in which organisms live ▪ Reveal patchiness on an even smaller scale • Abiotic factors of the biosphere: o On a global scale: ▪ Ecologists have recognized striking regional pattern in the distribution of terrestrial and aquatic life o Energy source: ▪ Solar energy powers almost all ecosystems • Availability of sunlight affects aquatic and terrestrial environments • Life deep in the ocean is powered by chemoautotrophic bacteria that get energy from inorganic chemicals o Temperature: ▪ Environmental temperature: • An important abiotic factor because of its effect on metabolism ▪ Some extraordinary adaptation enables some species to live in extreme temperatures o Water: ▪ Aquatic organisms face issues with water ▪ Main water problem: • Water is drying out o Wind: ▪ Some organisms depend on nutrients blown to them by wind • Pollen disperse ▪ Wind can also affect the pattern of a plant’s growth o Rocks and soil: ▪ Soil variation contributes to the patchiness we see in terrestrial landscapes ▪ In streams and rivers • The consumption of the soil can affect water chemistry • Three types of adaptation enable organisms to adjust to changes in their environments: o Physiological o Anatomical o Behavioral • Physiological o Mechanisms of temperature regulation, ▪ Responses by organism occur quickly o Acclimation: ▪ A physiological response that is longer term
More Less

Related notes for BSC 108

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.