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1 LIFE…AS WE KNOW IT!!. 2 Biosphere : layer of Earth that supports life roughly 13 miles thick ( 7 miles into atmosphere and 7 miles down into the oceans.

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Presentation on theme: "1 LIFE…AS WE KNOW IT!!. 2 Biosphere : layer of Earth that supports life roughly 13 miles thick ( 7 miles into atmosphere and 7 miles down into the oceans."— Presentation transcript:

1 1 LIFE…AS WE KNOW IT!!

2 2 Biosphere : layer of Earth that supports life roughly 13 miles thick ( 7 miles into atmosphere and 7 miles down into the oceans !!!) Biosphere : layer of Earth that supports life roughly 13 miles thick ( 7 miles into atmosphere and 7 miles down into the oceans !!!) Biomes : large regions of the globe defined by similar climate (T and precipitation) and vegetation Biomes : large regions of the globe defined by similar climate (T and precipitation) and vegetation –specific place on the map Ecosystems: All of the living organisms and the nonliving environment in a particular place Ecosystems: All of the living organisms and the nonliving environment in a particular place ( lg. ecosystems – small ecosystems) ( lg. ecosystems – small ecosystems)

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4 4 POPULATIONS: group of organisms, in same species (able to interbreed), in same area, at same time…“the 3 S’s” 5.1

5 5 Population Dynamics Populations change constantly in size and composition…what types of things in the environment limit the growth of a population? ***ANSWER! Populations change constantly in size and composition…what types of things in the environment limit the growth of a population? ***ANSWER! –Limited food and water –Predator increase (including hunting) –Climate and Weather conditions (drought, flood, tornado) –Diseases (immigration; close contact) –Space –Pollution They experience changes in their gene pool over time: They experience changes in their gene pool over time: –births, deaths, immigration (into), emigration (out of)

6 6 2 FACTORS THAT LIMIT POPULATION GROWTH 1. Density-dependent factors = dependent on 1. Density-dependent factors = dependent on the # of organisms in a given area. the # of organisms in a given area. *limited resources, predation, disease *intraspecific (between members of the same species) and interspecific (between members of different and interspecific (between members of different species) competition species) competition 2. Density-independent factors = 2. Density-independent factors = environmental conditions that limit growth (regardless of # of organisms). (regardless of # of organisms). *weather and climate are the most impt. * “natural” disasters (flood, fire, tornado, hurricane, etc.) etc.)

7 7 Cover up!!!!!!

8 8 Abiotic vs. Biotic Factors (that affect population growth/decline) Abiotic: water, shelter, space, weather, climate, sunlight, nutrients (soil). Abiotic: water, shelter, space, weather, climate, sunlight, nutrients (soil). Biotic: predation, disease & parasitism, food availability, mating, human impacts (disrupting habitats, introducing diseases, introducing nonnative species) Biotic: predation, disease & parasitism, food availability, mating, human impacts (disrupting habitats, introducing diseases, introducing nonnative species)

9 9 Growth Curves models that explain/depict how populations change over time. Growth Curves models that explain/depict how populations change over time. 2 Types: 2 Types: 1. Exponential: “J” shaped curve -rate of growth stays the same…continuous -population size increases steadily -ex. bacteria 2. Logistic: “S” shaped curve -“J” shaped that is limited by a density-dependent factor factor -death rate = birth rate -shows carrying capacity = the population size (max. #) that an environment can support.

10 10 examples Exponential growth Exponential growth Logistic growth Logistic growth

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12 12 Checking for understanding (3 parts) COMPLETE THE FOLLOWING (either on your iPad---then to me; OR on a half sheet of paper): COMPLETE THE FOLLOWING (either on your iPad---then to me; OR on a half sheet of paper): Answer reading check question after reading “Human Population” pg. 107 Answer reading check question after reading “Human Population” pg. 107 Graphing: #7 on pg. 107 Graphing: #7 on pg. 107 Pg. 103 Fig. 1: What distinguishes one zebra population from another zebra population? Pg. 103 Fig. 1: What distinguishes one zebra population from another zebra population?


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