PPT-Populations What Is a Population?

A population is a group of organisms of the same species that live in a specific geographical area and interbreed A population is a reproductive group because organisms usually breed with members of . Chapter Overview Questions. What are the major characteristics of populations?. How do populations respond to changes in environmental conditions?. How do species differ in their reproductive patterns?. 8. . POPULATION ECOLOGY. THE WOLF WATCHERS. Endangered gray wolves return to the American West. . THE . WOLF WATCHERS. . . Endangered . gray wolves return to the American West. A. Darwin’s . Ideas revisited. - it . was more than 50 years after Darwin started to develop . his theory . of evolution before biologists could determine . how evolution . takes place. - about . Chapter 42. Chapter 42 Populations. Key Concepts. 42.1 Populations Are Patchy in Space and Dynamic over Time. 42.2 Births Increase and Deaths Decrease Population Size. 42.3 Life Histories Determine Population Growth . Sharks originated 423 . mya. They comprise half of all . Chondricthyes. Over time, selection favored larger bodies and they fit the niche for the top marine predator. Found everywhere in the ocean but mostly on continental shelves. SWBAT compare the factors affecting animal populations to human populations . Why should you study human populations and their growth?. Bellwork. Demography. . is the study of the characteristics of populations, especially human populations.. Factors Affecting Population Growth. Populations grow and shrink in response to abiotic and biotic factors.. Abiotic. – physical & chemical factors such as water & light availability, soil structure, salinity, pH, etc.. Bell Work. Students will address how populations are distributed.. Students will describe how populations are sustained over time.. Today’s Objectives. Describing Populations. Geographic range- . the area inhabited by a population. Describing Population. Geographic Range. : area inhabited. Density and Distribution. : . Population Density - # of individuals per unit area. Distribution – individual spacing in a population (random, uniformly, clumping. 1.. The area in which certain types of plants or animals can be found living in close proximity to each other is called a. Habitat.. Community.. Niche.. Kingdom.. 2.. A British ecologist stated the importance of realizing an organism’s role in the ecosystem as follows: “When an ecologist sees a badger, they should include in their thoughts some definitive idea of the animal’s place in the community to which it belongs.” What does this statement describe?. species. . population. . habitat. niche. . community. Four Square Diagram = Include: definition, example(s), picture, description, pronounce, origin, sentence.. Definition. Examples. Picture. Choice. Population - Consists . of . all. the individuals of a species that live together in one place at one . time. Examples. : all the alligators living in the Everglades . this. . year. Demography - . Study of human population . LOW GENETIC VARIATION IN AMEN TO TA XUS FORMOSANA 389isozyme and random amplified polymorphic DNA(RAPD) markers (Williams et al., 1990). Geneticstudies based on isozyme data have major advan-tages ove A molecule consisting of two strands that wrap around each other to form a “twisted ladder” shape, with the sides made of sugar and phosphate, with rungs made of nitrogen-containing chemicals called bases.