UCSB EEMB 171 - Quiz 1 2016B Key (1) (4 pages)

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Quiz 1 2016B Key (1)



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Quiz 1 2016B Key (1)

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Pages:
4
School:
University of California, Santa Barbara
Course:
Eemb 171 - ECOSYSTEM PROCESSES

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Your Name EEMB ES 171 Winter 2014 Quiz 1 Read each question carefully Use the back if you need to 1 6 points What is soil texture Texture is only the mix of sand silt and clay mineral particles 2 12 points Why do ecosystem ecologists generally work with functional groups or growth forms of plants rather than species Because we are interested in biogeochemical processes and functions Many species of plants are functionally equivalent i e Mediterranean annual grasses all behave in very similar ways Also there are often too many species to consider individually we need to condense down into a manageable number of groups So full 12 point answer should hit both the idea of function and of numbers Perfect answer that only considers one aspect is maximum 8 points 3 12 points Briefly define the difference between Resistance and Resilience Is the concept of resilience relevant in the face of ongoing increases in global temperature Resistance is the ability of a system to resist change in the face of disturbance Resilience is the ability of a system to recover to the initial state following a disturbance Climate change is an ongoing and growing pressure so a system can t truly be resilient in the face of it because the disturbance is not going away A system can be resistant and avoid changing substantially in the face of the constant stress of climate change 6 points for adequately explaining the difference between resistance and resilience 6 points for getting the connection to climate change Your Name 4 16 points ClORPT is an important formula in ecosystem science A 10 What do the letters stand for Very briefly why are they each important Cl Climate Rainfall and Temp drive essentially all aspects of ecosystem function O Organisms those that have access to the site Control the community composition R Relief the physical structure of the landscape that regulates energy input erosion etc P Parent material the geological substrate an ecosystem develops on Controls the ultimate availability of mineral nutrients the texture of the soils hydrology etc T Time Time controls how completely a system develops soil weathering plant succession etc 2 points for explaining each term B 6 If you were going to design a large scale field experiment to analyze the influence of parent material on ecosystem structure and function how would you use the ClORPT concept to guide developing that experiment You would use ClORPT to help try to find sites where to the extent possible only P varied So you d look for a region in an area with a single climate zone where the same plants have access to the site you d pick sites of similar slope and aspect etc E g find areas in the hills above Santa Barbara with different rock types 5 12 points Many plants are highly tolerant of aboveground herbivory They get between 50 and 90 of their leaves eaten and they grow back quickly However very few



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