Exam (elaborations)
BIO 250 Exam 3 Questions And Answers With Verified Study Solutions
- Course
- Institution
BIO 250 Exam 3 Questions And Answers With Verified Study Solutions
[Show more]
Content preview
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:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Nipsey. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $11.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
77254 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now
