* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Invasive Species - General Bio Invasive_species_3
Survey
Document related concepts
Occupancy–abundance relationship wikipedia , lookup
Restoration ecology wikipedia , lookup
Unified neutral theory of biodiversity wikipedia , lookup
Biodiversity wikipedia , lookup
Habitat conservation wikipedia , lookup
Latitudinal gradients in species diversity wikipedia , lookup
Theoretical ecology wikipedia , lookup
Island restoration wikipedia , lookup
Invasive species wikipedia , lookup
Reconciliation ecology wikipedia , lookup
Biodiversity action plan wikipedia , lookup
Transcript
Warmup – verbal Why are Australian cane toads a problem? After all, lots of species have high population growth rates and high carrying capacities. What’s wrong with a species that grows so quickly? Discuss, be ready to share. Invasive species – 11/23 What is an “invasive species”? Discuss. Invasive Species: NOT native to an ecosystem Introduced to the ecosystem by humans Causes harm to the ecosystem, human health, or our economy. What is a “native species”? Discuss. Native Species: Lives in an ecosystem without having been distributed there by humans. Note: not all non-native species are invasive Why should you care? How do you think invasive species cause damage to the economy or the environment? Discuss. Economy Devastates key industries - seafood, agriculture, timber, hydro-electricity, and recreation (boating, fishing…). Costs Americans > 130 $billion/year (WA Invasive Species Council) Environment Impact/harm nearly half of all endangered or threatened species Lowers biodiversity Why does biodiversity matter? What is biodiversity? Discuss. Biodiversity = #of species in an ecosystem “Stable” ecosystems have relatively constant biodiversity over time How do invasive species affect biodiversity? Invasive species can decrease biodiversity less stable (big problem) Disrupt established food webs; Alter physical environment Allow for rapid changes to which native species can’t adapt Less stable systems are less able to respond to changes Invasive species can decrease productivity fewer resources for humans (e.g. food, pharmaceuticals) Why do invasive species do so well? Working with your neighbor, design a species (plant, animal, fungi, or bacteria/virus) that could become an invasive species in Mountlake Terrace. In your own notebook: Name and describe the species it’s ok to be a little creative, but keep it reasonable… Describe its birth and death rates Include what it would need to do in order to have these birth and death rates Use the words limiting factors, predation, competition, disease, birth rate, death rate, immigration, and emigration in your explanation Please complete this by the time on the board. Be ready to share. (Notes: your video notes on the Cane Toad, an invasive species in Australia, might help.) Factors affecting population growth (or, why invasive species do so well) Competition Better able to compete for resources like food, shelter, space (higher birth, lower death rates) Predation Have no/few predators (incl. parasites/diseases) or can easily avoid them (lower death rate) Reproduction Are able to quickly produce high numbers of successful offspring (high birth rate!) Immigration and Emigration Often continue to arrive in large numbers (immigration), and tend to stay put once in the new ecosystem (no emigration) Abiotic factors Well adapted to the climate /conditions of the new ecosystem (higher birth, lower death rates in the ecosystem they “invade”) Examples The following species are invasive in Washington State (or may be soon) Record brief descriptions of each of the invasive species covered in the next few slides. Brazilian Elodea Historically sold in pet stores, gets dumped in water bodies (streams, lakes) Grows VERY quickly. Chokes out native plants. Blocks passage of native salmon Not much eats it very quickly Well adapted to Pacific NW Illegal to buy/sell in WA (It’s in our jars! I’ll dispose of it carefully.) Zebra Mussel Reproduce VERY quickly Filter out nutrients from freshwater rivers, lakes, harming native species (better competitors for food) Grow so fast that native species are crowded out (comp for space) No real predators Clog water intakes, hydroelectric dams Not in WA, yet? Himalayan Blackberry Evergreen shrub with thorns and edible fruit Found throughout WA Shades/outcompetes native species Lowers biodiversity Nutria Live in marshy areas, though not yet well established in WA Breed very quickly in Louisiana population went from 20 to 20 million in two decades! Eat tremendous amounts of food – degrading wetlands and removing food for native species Can cause destroy dikes, dams, cause flooding. Invasive species in the Pacific Northwest: Tunicates (sea squirts) Lives in the Puget Sound, displaces native mussels, clams and oysters Has abundant food (filter feeds) No predators Reproduces quickly Well adapted to climate Asian Carp Native to Eurasia Outcompete native fish – eat EVERYTHING! Affect fisheries Not here yet…but… http://www.youtube.com/watch?v= qfG4vsJ5_xI English Ivy A woody evergreen vine or shrub, English Ivy is found throughout Washington state Grows and spreads very, very quickly Can crowd native plants Reduces animal foraging Very hard to remove from an ecosystem Eurasian Milfoil Common in freshwater ecosystems throughout North America Spreads very rapidly Crowds out native plants No predators Purple loosestrife Common in wetlands throughout the US Crowds out native species, eliminating food sources for many aquatic (often endangered or threatened) birds Destroys wetland habitat Cannot be killed by an pesticides, no known predators State law requires landowners to control it! Cane Toads – a Review Think back to the Cane Toad video. Take out your notes if you need a refresher. Working alone, list reasons explaining why Cane Toads are such a successful invasive species in Australia. Specifically refer to what we just discussed in class.