Ecological Niche out-of-character

framework Introductory Biology / General Education course Large enrollment (>100 students) With lab / demonstration our unit is for the lab component (25 students) half-way through course first introduction to ‘ecological niche’ concept

tidbit Concept “ecological niche” Course goal: understand the dynamic interface of biotic and abiotic systems Learning outcome: evaluate a species’ ability to occupy an ecological niche given the changes in the environment

Ecological Niche through the lens of invasive species

What is an ecological niche? some obvious thoughts

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list characteristics 2 minutes work on your own

list characteristics 2 minutes work on your own when done: put list aside

Risk Your Niche Rules of the Game

who won? Team# of natives # of non- natives

Debrief what made you win? what made you lose? would you choose different traits next time? what makes you succeed in a changing environment? Honor student question: are strong invaders also more robust against climate change?

Post test: Yosemite edit your traits categorize your trait biotic | abiotic context 2 minutes

Tidbit reminder Course goal: understand the dynamic interface of biotic and abiotic systems Learning outcome: evaluate a species’ ability to occupy an ecological niche given the changes in the environment

Summative Assessment In the 1920, the Yosemite Valley floor was home to a diverse native plant community. A small number of Russian thistle plants, a non-native species, also occupied this ecological niche. For many years, the relative ratio of native to non-native plants was stable. In 1928, there was a fire that swept across the Valley floor. When the plant community began to grow back, the Russian thistle was the dominant species and occupied more than 90% of the ecological niche in the valley, but remained rare in the mountains. 1. How would you characterize the process that occurred between 1920 and 1928? a. The Russian thistle invaded the ecological niche of the wildflowers. b. The wildflowers outcompeted the Russian thistle. c. The wildflowers were destroyed in the fire. d. The wildflowers mutated and became less competitive than the Russian thistle. e. Alien invasion. 2. Which trait would allow the Russian thistle to become the dominant species? a. Large range of pH tolerance. b. Heat adaptation. c. High reproductive rate. d. b and c. e. all of the above. 3. In 1999, a flash flood swept across the valley floor. By 2010, all Russian thistle had disappeared. How could this have happened? a. Tourists collected the Russian thistles as souvenirs, causing the local extinction of the Russian thistle. b. Russian thistles are less drought tolerant. c. Russian thistles outcompeted the local wild flowers. d. The habitat was less suitable for the Russian thistle after the flood. e. The flood swept away all plants in the valley and the valley was re-colonized by the plants above the valley.