ECOL 1000 1nd Edition Lecture 24 Outline of Last Lecture I. Exotic vs Invasive speciesII. Brown tree snakeIII. Burmese pythons in FLOutline of Current Lecture II. Examples of invasive speciesIII. Characteristics of successful invadersIV. Characteristics of invadable communitiesV. Amphibian and Bat declinesa. Chytridiomycosis: Disease-driven global amphibian declinesb. White-Nose Syndrome: disease-driven bat declinesVI. Amphibian DiversityVII. Amphibian ThreatsCurrent Lecture- Asian carpo Group of 7-8 species of carp introduced from china/Asiao Imported to help clean commercial fishery ponds and escapedo Attain very dense populations in invaded streamso Highly disruptive to the ecosystem: feeds on native mussels and snailso Attempt to keep them from entering the great lakes through electric barrierso Try to get people to start eating Asian carp, but the filets are filled with bones Renamed “carp” as “Kentucky Tuna”- Lionfisho Brought from Pacific, released in Atlantico Reproduce rapidlyThese 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 No natural predators, lethal- Hemlock woolly adelgid (nonnative invasive insect)o Brought from Asia on plants and has been in the US since 1924o Feed during all seasons and is dispersed by wind, birds, and mammals- Kudzuo Brought in intentionally to control roadsideso Goats eat kudzu- Cane Toads- Characteristics of successful invaderso High reproductive rateso Short lived generation timeo Lon-livedo Single parent reproductiono Vegetative or clonal reproductiono Ployhagous (broad died)- Characteristics of invadable communitieso Climatically matched with invadero Low diversity of native specieso Sabsence of predators on invading specieso Absence of fire in golutionary theoryo Anthropognically- Amphibian and Bat Declines- Chytridiomycosis: Disease-driven global amphibian declines- White-Nose Syndrome: disease-driven bat declines- Amphibian diversityo 70-80 species in tropical habitatso Often most abundant land vertebrateo 25,000 frongs in some forests of the neotropicso Adults and larvae occupy virtually all aquatic habitatso 6000+ species of amphibians 43% in decline 32% threatened 120 presumably extinct since 1980 23% data deficient, probably endangered- Amphibian Threatso Habitat loss and alterationo Invasive specieso Chemical contaminationo Commercial exploitationo Diseaseo Causes may often be a combination of threats, and generally have anthropogenic originso i.e. golden toadso i.e. gastric brooding
View Full Document
Unlocking...