Transcript corn borer
D.N.A Objective: SWBAT explain how ecosystems can change over time IOT determine the stability and health of the environment • Scientists genetically modified a variety of corn to protect it against pests like the corn borer. The corn borer is an insect caterpillar that feeds on the corn stalk, which weakens the stalk and makes it fall over. A new gene in the genetically modified corn causes the plant to produce a chemical that is toxic to the corn borer. Some people are concerned that the genetically modified corn could harm other insects such as the monarch butterfly caterpillar. The monarch caterpillar eats leaves of milkweed plants that might be coated with toxic corn pollen. However, not all researchers agree with the concerns regarding the monarch butterfly caterpillar. They state that only a small percentage of caterpillars feed on the milkweed plants near corn fields. Which of these describes the trophic level of the corn borer? A. B. C. D. Carnivore Herbivore Producer Decomposer D.N.A Objective: SWBAT explain how ecosystems can change over time IOT determine the stability and health of the environment • Scientists genetically modified a variety of corn to protect it against pests like the corn borer. The corn borer is an insect caterpillar that feeds on the corn stalk, which weakens the stalk and makes it fall over. A new gene in the genetically modified corn causes the plant to produce a chemical that is toxic to the corn borer. Some people are concerned that the genetically modified corn could harm other insects such as the monarch butterfly caterpillar. The monarch caterpillar eats leaves of milkweed plants that might be coated with toxic corn pollen. However, not all researchers agree with the concerns regarding the monarch butterfly caterpillar. They state that only a small percentage of caterpillars feed on the milkweed plants near corn fields. Which of these describes the trophic level of the corn borer? A. B. C. D. Carnivore Herbivore Producer Decomposer ANNOUNCEMENTS BIOLOGY FAST 1 (BENCHMARK) is on Monday, October 24 WE WILL REVIEW NEXT WEEK! ADVISORY • WELCOME TO COLLEGE ED • Objective: SWBAT explore the purpose for the advisory program and begin to understand the value of making decisions and the importance of being involved in planning for their future. Look at these photos. What do you think would happen if no one ever took care of the sidewalks? What would it look like in 10 years? In 100 years? #1.6 Aim: How do ecosyste ms change over time? How do you get from THIS… Agenda QOD (10) Lesson: succession (15) Activity: courtyard scavenger hunt (15) Summary Share (5) HW #5 #1.6 Aim: How do ecosyste ms change over time? To THIS… Agenda QOD (10) Lesson: succession (15) Activity: courtyard scavenger hunt (15) Summary Share (5) HW #5 #1.6 Aim: How do ecosyste ms change over time? Succession – Series of changes in a community over time Agenda QOD (10) Lesson: succession (15) Ecological communities progress over time. Activity: courtyard scavenger hunt (15) Summary Share (5) HW #5 Why do you think the smaller plants appear first? (What do they do for the larger plants?) #1.6 Aim: How do ecosyste ms change over time? Agenda QOD (10) Lesson: succession (15) Activity: courtyard scavenger hunt (15) Pioneer species – the first species Summary to populate an area. These Share (5) start making the soil species HW #5 Climax community – a mature, stable community - what the community would be like if no disturbances ever occurred. Lichens and mosses are an important pioneer species #1.6 Aim: How do ecosyste ms change over time? Disturbances Disturbances interrupt regular processes of the ecosystem. Agenda QOD (10) Lesson: succession (15) Activity: courtyard scavenger hunt (15) Summary Share (5) HW #5 volcanic eruption – lava flow Humans clear-cut a forest Depending on the type of disturbance, there can be 2 types of succession… Primary Succession • Succession that occurs on the surface where no soil exists – Example: volcano, glaciers, above ground explosion Secondary Succession • Sequence of changes that takes place after an existing community is disrupted • When the disturbance is over, community interactions tend to restore an ecosystem to its original condition – Examples: natural events – forest fires – Examples: human activities - farming • After a forest fire Primary Succession Changing ecosystem from scratch (no living organisms) Secondary Succession Changing ecosystem from an existing ecosystem (there are living organism) Which kind of succession is it? (primary or secondary?) wildfire Which kind of succession is it? (primary or secondary?) wildfire #1.6 Aim: How do ecosyste (primary ms change over time? Which kind of succession is it? or secondary?) Agenda QOD (10) Lesson: succession (15) Activity: courtyard scavenger hunt (15) Summary Share (5) HW #5 1st: Decomposers feast on the decaying meat A gray whale dies, and sinks to the otherwise barren ocean floor… #1.6 Aim: How do 2nd: After a year, most of the whale tissue is eaten. ecosyste ms supports small fishes and other marine animals change over time? The carcass still Agenda QOD (10) Lesson: succession (15) Activity: courtyard scavenger hunt (15) Summary Share (5) HW #5 As the whale’s body decays, it enriches its surroundings with its nutrients. This makes an oasis that attracts sediment dwellers of marine worms. #1.6rd Aim: 3 : When only the skeleton remains, heterotrophic bacteria begin to How do decompose the oils inside the whale bones, and support a diverse ecosyste ms community of mussels, worms, crabs, and clams. change over time? Agenda QOD (10) Lesson: succession (15) Activity: courtyard scavenger hunt (15) Summary Share (5) HW #5 #1.6 Aim: How do ecosyste (primary ms change over time? Which kind of succession was that? Agenda QOD (10) or secondary?) What were the Primary – starting from Lesson: a barren ocean floor… succession pioneer species? What was the climax community? (15) Activity: courtyard scavenger hunt (15) Summary Share (5) HW #5 Pioneer species - decomposers Climax community: the bacteria decomposing the oils in the whale bones that support all the other species…