InvasiveSpecies - Lecture 38: April 9 Species Invasions...

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Lecture 38: April 9 Species Invasions Discussion Activity this week No readings Exam Review; bring your Qs Check Qwizdom Points on SAMS https://cats.lsa.umich.edu/ Chapter 55 :1273-1275; Molnar et al. 2008 article Invasive Species Dr. Jessica Poulin What is the leading cause of endangerment worldwide? Habitat Destruction What is the second leading cause of endangerment worldwide? INVADERS
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Just what exactly is an invasive species? A species that is naturally found in one area, but is also found flourishing in another area Brown tree snake ( Boiga irregularis ) Common plant invaders from Michigan Garlic mustard ( Alliaria petiolata ) Hydrilla ( Hydrilla verticillata ) Common animal invaders from Michigan Emerald Ash Borer ( Agrilus sp . ) Zebra mussel ( Dreissena polymorpha ) Why did I study invasives? Fire ant ( Solenopsis spp.) • “Operate” on short time scales • Economic effects • Ecological effects Purple loosestrife ( Lythrum salicaria )
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Why study invasives? – Ecological effects 1) Ecosystem level changes 3) Novel parasites and pathogens 2) Species interactions The Invasion Process Brown tree snake ( Boiga irregularis ) Sakai et al . (2001) Native elsewhere Survival in transport Establish in new area Lag period Spread Ecological impact Emerald Ash Borer ( Agrilus sp . ) Predicting invasiveness Why are some species successful invaders and others are not? Just like asking - Why do lemurs live on Madagascar and monkeys do not? Predicting invasiveness Why do lemurs live on Madagascar and monkeys do not? • Genetics • Habitat or resource needs • Chance events
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Comparing to Predicting invasiveness So I ask: Why is a single species invasive some places, but not other places? Comparing to • Pre-adaptations to the new habitat • Rapid evolution within the new habitat The Invasion Process – Controlling factors • Range limitations • Biological factors • Pollinators, predators, pathogens • Non-biological factors • Climate, habitat needs Genetic Factors Ecological Factors
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Fountain grass as a model organism • C 4 , wind-dispersed, bunch grass • Native to the Middle East • Varies in invasiveness Hawaii - Highly invasive Arizona - Moderately invasive Southern California - Not yet invasive
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InvasiveSpecies - Lecture 38: April 9 Species Invasions...

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