ECOL 1000 UGA Connelly Exam 3 Questions And Answers Verified 100% Correct

ECOL 1000 UGA Connelly Exam 3 Questions And Answers Verified 100% Correct fewer - ANSWER -small islands support ____ species than large islands. more - ANSWER -islands near the mainland have ______ species than those further away extinction event - ANSWER -sharp decrease in diversity and abundance of macroscopic life; occurs when the rate of extinction increases with respect to the rate of speciation background rate of extinction - ANSWER -average rate of extinction that occurred before the appearance of humans 1 species/yr - ANSWER -how many species are expected to be lost per year on average based on the background rate of extinction 1,000-10,000 x the rate - ANSWER -how many times the background rate of extinction are we predicted to be at right now? 1. endemic or small local populations 2. species that migrate seasonally 3. specialized habitat requirements 4. large home ranges 5. conflicts w humans or used by humans - ANSWER -things that increase a species' risk of extinction: 1. habitat loss/alteration 2. invasive species 3. coextinctions 4. commercial exploitation 5. disease - ANSWER -main threats to biodiversity habitat fragmentation - ANSWER -localized clearing; reduction of large habitat into smaller, isolated patches wolf & giant african land snails (video) - ANSWER -example of invasive species IUCN (international union for the conservation of nature) red list - ANSWER defines classifications of species likelihood of extinction in their "red list" critically endangered - ANSWER -50% likelihood of extinction in 10 years endangered - ANSWER -20% likelihood of extinction in 20 years vulnerable - ANSWER -10% chance of extinction in 100 years endangered species act (ESA) - ANSWER -(1973) law created to protect critically imperiled species from extinction as a "consequence of economic growth and development un-tempered b adequate concern and conservation" US fish and wildlife service & NOAA - ANSWER -law was created and administered by these 2 federal agencies snail darter - ANSWER -this endangered species stopped the construction of a dam and caused a supreme court case exotic - ANSWER -species introduce either accidentally or deliberately by human actions into places beyond its natural geographic range (ie. house sparrow) invasive - ANSWER -an alien species whose introduction does (or is likely) to cause economic or environmental harm or harm to human health (negative) extirpated - ANSWER -locally extinct, but existing elsewhere still brown tree snake - ANSWER -snake that made a lot or birds and lizards go extinct in guam burmese pythons, asian carp - ANSWER -problematic invasive species high reproductive rates, short generation time, long lived, high dispersal rates, single parent reproduction, vegetative/clonal reproduction, habitat generalist, polyphagous - ANSWER -characteristics of successful invasive species match climate, low diversity of native species; absence of predators, similar native species, fire in evolutionary history, and anthropogenically disturbed - ANSWER characteristics of invadable communities flagship species - ANSWER -species selected to act as an ambassador or symbol for a defined habitat, issue or environmental cause genetic diversity - ANSWER -variation in genes among individuals of same species height, hair color - ANSWER -examples of genetic diversity true - ANSWER -t or f: genetic diversity improves survival of population outbreeding - ANSWER -sexual reproduction of not closely related individuals true - ANSWER -t or f: outbreeding maximizes genetic diversity inbreeding - ANSWER -this increases chances of genetic diseases species diversity - ANSWER -the variety of species present in an area; includes the number of different species that are present as well as their relative abundance ecological diversity - ANSWER -the variety of habitats, niches, trophic levels, &community interactions case study- paul cox - ANSWER -a plant physiologist (dr) moved his whole family to a samoan rainforest to find a cure for cancer among the many plants in lush tropical area