ECOL 1000 1nd Edition Lecture 23 Outline of Last Lecture I. Risk of ExtinctionII. Threats to biodiversityIII. How to classify extinction?IV. Endangered Species ActOutline of Current Lecture II. Exotic vs Invasive speciesIII. Brown tree snakeIV. Burmese pythons in FLCurrent Lecture- Exotic species vs. Invasive specieso Exotic species: a species introduced either accidentally or deliberately by human actions into places beyond its natural geographical rangeo Invasive species: an alien species whose introduction does (or is likely to) cause economic or environmental harm or harm to human healtho The majority of introductions fail How well does the species do at low densities (reproduction and finding a mate)? How vulnerable is the organism to climatic variation, or photoperiod? How important are predators or disease? Are some questions that need to me considered that affect success of introduction I.e. brown noddy has not successfully bred since 1980s- No one knew why- Native islanders noticed the birds began disappearing around the time snakes arrived- Many went extinct, some species were extirpated (locally extinct)- Brown tree snake These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.o Inadvertently introduced to Guam in 1950s in military shipping cargoo Loss of 9 of 12 native birdso Loss of 6 of 12 native lizardso Eradicated snakes by dropping rats with aspirin- Burmese pythons in Flo Pythons a popular pet, imported in 1000’s to USo Released into the wildo Established in the Everglades around 1979 with 200 seen in early 2000so Currently, 50000-180,000 snakeso 99% declines of many native mammalso 15-25 year lifespan, one female can lay 100 eggs each clutcho Hatchlings are larger than native snake newborns and grow more rapidlyo Endangered in parts of Asia, invasive in USo How to control? Permitting and microchips Lacey Act/ illegal to currently import Harvest for hid and meat Snake
View Full Document
Unlocking...