MOUNTAIN PINE BEETLE Why Are Our Forests Changing?

Transcription

1 MOUNTAIN PINE BEETLE Why Are Our Forests Changing? Created in the Making Global Local workshops University of Colorado at Boulder Summer, Created by: Melissa Barker, High School Biology and Environmental Sciences, Alexander Dawson School Jim Moulton, Physics, Geology and Environmental Sciences, Longmont High School Barbara Keith, Physics, Biology, and Environmental Sciences, Silver Creek High School Cheryl Manning, Earth Science and Environmental Sciences, Evergreen High School Mountain Pine Beetle 1

2 MOUNTAIN PINE BEETLE Why are our forests changing? Created in the Making Global Local workshops University of Colorado at Boulder Driving Question Why are our forests changing? Grade Level 9-12 (could be adapted for middle school) Lesson Time Requirement Five 50- minute periods Climate Literacy Principles Addressed (links) 3. Life on Earth depends on, is shaped by, and affects climate. 7. Climate change will have consequences for the earth system and human lives Colorado State Standards Addressed High School: LS2, LS9, ES4 Learning Objectives Students will: understand general Mountain Pine Beetle ecology. demonstrate an understanding the effect of Mountain Pine Beetle on forest health. understand the influence of climate on Pine Beetle population understand the influence of humans on climate change understand the influence of forest management practices on forest health Prior Knowledge Required All organisms have specific life cycles. Organisms have optimal conditions for survival. 2

3 Common Student Misconceptions & Prior Understandings Pine trees are dying off in the foothills and mountains all around western North Ameri- ca. Are Mountain Pine Beetles native or non- native? Trees may be dying off because of road salt, fungus, or bacteria. The trees are dying because they are old. Materials Use of computer lab with Internet access; student handouts Introduction to Lesson A tiny beetle is wreaking havoc throughout the forests of western North America. Not since the early 1980s has there been such an explosion of Mountain Pine Beetle, an insect that targets lodgepole pine first and then will move onto other species when the logdepoles are gone. The population of beetles waxes and wanes as a natural cycle; however, warmer winters and hotter summers are allowing beetle populations to expand faster and further than has been previously noticed. The Mountain Pine Beetle population explosion from affected over 45 mil- lion acres of forests stretching from British Columbia and Alberta southward to Colorado, New Mexico, and Northern Arizona. Lesson Sequence Day 1 Pre- assessment Pose the following questions to the entire class. Have them answer them qui- etly to themselves. When they are done, students take a few minutes to share their answers in a small group. 1. Why the forests are dying? 2. What are Mountain Pine Beetles? 3. What do you need to know about forests and pine beetles to help us determine if the beetles are causing the die off. Watch the video at scientist- interviews- and- links/pine- beetle- epidemic As a whole class, discuss the pre- assessment questions and the video. Guide students to devel- op the following research questions: 1. What is the life cycle of the mountain pine beetle? Mountain Pine Beetle 3

4 2. What are the density dependent and density independent limiting factors of the Moun- tain Pine Beetle and how they could affect the beetle population? 3. What niche does the Mountain Pine Beetle fill in the forest? 4. How do Mountain Pine Beetles affect trees? What types of trees are affected? 5. What is the role of the fungus carried by Mountain Pine Beetles? 6. If you suspect that the mountain pine beetle has infected a tree, what signs or symp- toms would you look for? 7. What has happened to the temperature in Colorado over the past 100 years and how might this be related to Mountain Pine Beetle population? 8. Why has the temperature in Colorado changed over the past 100 years? 9. What practices has the forestry department used for maintaining Colorado forests over the past 100 years? How might forestry management practices affect beetle popula- tion? 10. What are the phases of population growth for Mountain Pine Beetles? (ie:endemic, in- cipient, epidemic, declining) Days 2-3: Student research - In groups, students will research each question and create computer presen- tations. Resources below will help give students a starting point for their research. pine- beetle.html ains/case_study/western_forests_mountains6_11_09.pdf Beetles- Brochure.pdf beetles.shtml Day 4: Students present their research to their peers. This may take more than one day if the class is large or students presentations are long. If time is an issue, students can send their presenta- tions to the teacher, who could select one slide from each groups research. Students present their findings to the whole class for one slide only. Following each slide, the class discusses their different perspectives on the content. Day 5: Concept Mapping and Concluding Discussion After student presentations, have students work individually to create a concept map that links key terms about mountain pine beetles using the Concept Map handout and this list of terms: 4

5 biomes carrying capacity climax community coevolution community competitive exclusion princi- ple ecosystem evolution food web fundamental niche gross primary productivity indicator species K- selected keystone species latitudinal biodiversity gradi- ent limiting factors (density de- pendent and independ- ent) life history strategy natural selection net primary productivity (NPP) optimum range pioneer species population primary producers realized niche r- selected range of tolerance species interactions (competi- tion, predation, parasit- ism, mutualism, commen- salism) species richness succession (primary and sec- ondary) trophic cascades trophic level Mountain Pine Beetle 5

6 After students have completed concept maps, teacher leads a concluding discussion of what has been learned using the following guiding questions: 1. How do the Mountain Pine Beetles kill trees in Colorado? 2. What are other causes of mortality for trees in Colorado forests? 3. What characteristics of the forests in Colorado have caused the numbers of Pine Beetles to increase? 4. What is the difference between endemic and epidemic levels of beetle populations? 5. How do we know that present beetle populations are unusual? 6. What affect have forest management policies had on Pine Beetle populations? 7. What relationship has the changing climate had on Pine Beetle populations? 8. What affect have humans had on the changing climate in Colorado? Student Handouts All available at LearnMoreAboutClimate.Colorado.edu under For Educators. 1. Part A. MPB Research Questions 2. Part B. MPB Peer Group Assessment 3. Part C. MPB Concept Map Assessment Assessment Students will be assessed on their student presentations, notes pages from presentations, their discussion participation, and their concept maps. Lesson Development Prompts This lesson was developed for high school environmental science courses (both AP and regular) and taught during an ecology unit. Students are involved in inquiry as they develop research questions and investigate a significant problem that is affecting western forests. Students re- port to their peers about what they learn in their research. Background Reading for Students and/or Teachers See the provided Resources folder for some suggested readings. References (Pine Beetle Mania activity) 6

7 (CSU- Mountain Pine Beetle) pine- beetle.html Beetles- Brochure.pdf /Case_Study/Western_Forests_Mountains6_11_09.pdf beetles.shtml closer- look- at- the- science/scientist- interviews/video/thomas- veblen (full interview of Beetle expert) impacts/#smith Precipitation with source.doc Temperature with source.doc Snow Pack Data.xls Snow Pack Graph.xls Tree Mortality in the Western US.pdf Tree Mortality in the Western US_short.pdf Research ties tree mortality to climate warming Extensions See the provided Resources folder for various extensions and readings. Students interested in the far- reaching affects of beetles may want to examine economic im- pacts on ski areas, logging and timber harvesting companies, bio- fuels, and tourism. One possibility is for students to examine feedbacks in the carbon cycle: Canadian Researchers have estimated that by 2020, the pine beetle outbreak will have released 270 megatons of car- bon dioxide into the atmosphere from Canadian forests. There is yet to be an accepted study of the carbon cycle effect over a future period of time for forests in the U.S. See Colorado Snow Pack Data in the Resources folder for an example spreadsheet that could enable students to examine the relationship between snowpack and beetle outbreaks. Climate Literacy Essential Principles Addressed 3. Life on Earth depends on, is shaped by, and affects climate. a. Individual organisms survive within specific ranges of temperature, precipitation, hu- midity, and sunlight. Organisms exposed to climate conditions outside their normal range must adapt or migrate, or they will perish. c. Changes in climate conditions can affect the health and function of ecosystems and the survival of entire species. The distribution patterns of fossils show evidence of grad- ual as well as abrupt extinctions related to climate change in the past. Mountain Pine Beetle 7

8 7. Climate change will have consequences for the earth system and human lives e. Ecosystems on land and in the ocean have been and will continue to be disturbed by climate change. Animals, plants, bacteria, and viruses will migrate to new areas with fa- vorable climate conditions. Infectious diseases and certain species will be able to invade areas that they did not previously inhabit. Colorado State Science Standards (Based on the new Standards) High School: Life Science LS2. Explain and illustrate with examples how living systems interact with the biotic and abiotic environment. LS9. Analyze how various organisms grow, develop, and differentiate during their lifetimes based on the interplay between genetics and their environment High School: Earth Science ES4. Evaluate evidence that Earth s geosphere, atmosphere, hydrosphere, and bio- sphere interact as a complex system. 8