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BIO 250 Exam 3 Questions And Answers With Verified Study Solutions
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BIO 250 Exam 3 Questions And Answers With Verified Study Solutions
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BIO 250 Exam 3 Questions And Answers With Verified Study Solutions Succession ANS repeatable change in community composition over time following a disturbance Primary Succession ANS succession after a catastrophic disturbance that removes soil and all beings Secondary Succession ANS more minor scale disturbance that doesn't completely remove soil or beings Disturbances affect ANS *physical structure of environment *alter resource availability *kill organisms Sessile Organism ANS Cannot change physical location (plants, fungi, barnacle, mussel) Facilitation ANS early stress -tolerant species facilitate and make environment more suitable for successional species Inhibition ANS any species arriving on a disturbed site will survive and prevent others from establishing (short lived replaced by longer -lived). Tolerance ANS assumes that any species arriving on a recently disturbed site will survive and have no impact on others establishing (later -successional compete better preventing establishment of early successional species) intermediate disturbance hypothesis ANS predicts species diversity will be highest when frequency/intensity of disturbances are intermediate/mild What's the direction of the food chain ANS primary producers -> herbivores -> predators Top-Down Control ANS when the top of the trophic level determines structure/function of lower trophic level through predation. Trophic Cascades occurs when ANS Predation limits herbivore populations which makes it harder for plant populations to expand. Behavioral Trophic Cascade occurs when ANS predators alter the behavior of herbivores, which reduces grazing pressure and benefits plant populations. Ecology of Fear ANS describes how predation risk can indirectly affect populations, communities, and ecosystems Ecosystem Engineers indirectly affect community dynamics by ANS modifying the environment and altering resource availability Autogenic engineers ANS Alter environments through their physical structure (trees -shade)(corals -buffer waves) Allogenic Engineers ANS Alter environments through the structures they build (beaver -dam)(gopher -tunnels) Top down force example ANS Trophic cascades Bottom up forces example ANS resource availability bottom up control ANS organisms are resource limited by the lower trophic level Productivity hypothesis ANS Argues that more productive ecosystems should have longer food chains Ecosystem -size hypothesis ANS argues larger ecosystems should have more resources and longer food chains Productive -Space hypothesis ANS argues food chain length is determined by combination of first 2 hypothesis Frequency of Disturbance affects the... ANS relative importance of top -down/bottom -up control in any communityThe benefits of buying summaries with Stuvia:
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