Objective: Students will know that an ecosystem includes both biotic and abiotic factors AND that changing one factor in an ecosystem can affect many other factors.

13.2 Biotic and Abiotic Factors Set up Cornell Notes on pg. 89 Topic: 13.2 Biotic and Abiotic Factors Essential Question(s): What role might an abiotic factor such as temperature play in the evolution of a species? 13.2 Biotic and Abiotic Factors 2.1 Atoms, Ions, and Molecules KEY CONCEPT Every ecosystem includes both living (biotic) and nonliving (abiotic) factors.

KEY CONCEPT Every ecosystem includes both living (biotic) and nonliving (abiotic) factors.

Biotic factors are living things. plants animals fungi bacteria plants

Abiotic factors are nonliving things. moisture temperature wind sunlight soil moisture sunlight

Every ecosystem contains biotic and abiotic factors List the biotic and abiotic factors in this picture Share with your neighbors

Biotic and Abiotic Factors (2m40s) http://www.youtube.com/watch?v=E1pp_7-yTN4

Levels of Organization Please look at your L.O.O. poster Please go back and label ALL of your living and non-living parts with either biotic or abiotic Pine trees: biotic Bird: biotic Water: abiotic Reindeer: biotic Rabbit: biotic Bear: biotic Reindeer: biotic Soil: abiotic

Abiotic Factors and Plant Growth (Top 2/3 Pg 88) Problem: How do abiotic factors affect plant growth Procedure: Choose an abiotic factor to test on the growth of radish seedlings. Possible factors include: amount of sunlight, amount of water, soil type, or amount of fertilizer…etc Determine a way to vary the factor you have chosen. Be sure to include at least three different settings of your variable and to keep all other factors constant. Write about a procedure for your investigation. Hypothesize what you think your experimental results might be. Draw a picture to illustrate your possible findings.

Biodiversity is the assortment, or variety, of living things in an ecosystem. Rain forests have more biodiversity than other locations in the world, but are threatened by human activities. (50% of the world’s plant and animals species are here)

Number of species NOT Population number Biodiversity has to do with: Number of species NOT Population number

Extinctions lower biodiversity!!!

Biodiversity: “The Wild Classroom” (6m11s) http://www.youtube.com/watch?v=vGxJArebKoc

Bill Nye: Biodiversity (22 mins) http://www.youtube.com/watch?v=iFeRFmqFChQ

A keystone species is a species that has an unusually large effect on its ecosystem. Ex: A beaver Their removal from the ecosystem may cause a ripple effect felt across an entire ecosystem keystone Arch collapses without it

Sea Stars Eat sea urchins/ mussels/ shell fish which have no other predators What will happen if star fish disappear? The mussel population will “explode” This explosion will drive out other species

Sea Otters Sea otters protect the kelp forest from the destruction of sea urchins Sea otters eat sea urchins What will happen if sea otters disappear? Urchins will sever kelp forests at the base destroying them

Keystone Species (3m58s) http://www.youtube.com/watch?v=_IWw8Ruz8Uo

Keystone Species: Prairie Dog http://www.youtube.com/watch?v=kEh4r4iQiBU

REVIEW Pg. 88 (Bottom 1/3 of pg. 88) 1. How would the removal of a keystone species affect an ecosystem’s biodiversity? 2. Analyze: Humans are sometimes described as being a keystone species. Does this label fit? Why or why not?

REVIEW 1. How would the removal of a keystone species affect an ecosystem’s biodiversity? The removal of a keystone species would decrease the ecosystem’s biodiversity. 2. Analyze: Humans are sometimes described as being a keystone species. Does this label fit? Why or why not? Keystone species are those that help to establish and maintain a complex web of life. Humans do not fit this label because human activities often decrease, rather than increase, biodiversity.