ENWC201 Lecture Notes - Lecture 16: Tasmania Cricket Team, Overexploitation, Near-Threatened Species

• School: University of Delaware
• Department: Entomology and Wildlife Conservation
• Course: ENWC201
• Professor: Kyle Mc Carthy

Document Summary

Over time we began to do more =habitat degradation + introduced species + These all work together to lead us towards an extinction event. Ecological extinction - low density, no longer interacts. Species is still there, no longer interacts in their ecosystem like they are supposed to. Local extinction - species lost in only an area or region (extirpation) Brown bear - no longer in california. Sea otters were removed from certain areas in the pacific. Eat sea urchins - when otters were gone, urchin populations rose, kelp went extinct then urchins went extinct. Dozens of species experienced local extinction due to the loss of their food sources. Ecosystem still has not recovered from something in the. Some extinctions have larger effects than others. Beavers - alter waterflow, create beaver ponds, those ponds are home to many species. When ponds dry up in 10-15 years it creates beaver meadows which are also home to many species.