# good oyo ch 8

Term
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designate the following ecological factors as biotic or abiotic: rainfall, plankton concentration, temperature, species population, dissolved oxygen.
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Terms in this set (12)
when studying populations, scientists often discuss the reproduction rate necessary for a population to remain unchanged. for example, in order for the human population to remain unchanged year to year, each woman on the planet must have an average of 2.0-2.2 children. postulate why this average would result in a constant human population.
an aquarium owner decides to get rid of his aquarium and releases a few non-native sea urchins into the ocean nearby. many years later, a scientist studying that area notices that the population of native sea urchins has drastically decreased. assuming there have been no other significant changes to the area, what may have occurred? was this most likely due to the intraspecific or interspecific competition?
barnacles can be found growing on many surfaces in marine ecosystems. they even grow on other organisms, such as scallops and crabs. suppose marine biologists do a long-term study of a marine ecosystem. at first, there are few if any barnacles attached to the crabs. however, over a period of several years, the population of barnacles slowly increases, and as time goes on, more and more start attaching themselves to the crabs. over this whole time, the population of crabs stays the same. only the barnacle population increases. would the relationship between the crabs and barnacles most likely be an example of parasitism, commensalism, or mutualism?
8.7 Name the trophic levels in the following food chain: macroalgae are eaten by wrasse fish, which are eaten by grouper, which are eaten by a shark. By the time the energy has traveled through this chain, has more of less energy been lost in this scenario than the energy loss at the top of of the food chain in question 8.6?
8.9 Two ecosystems are being compared in a light and dark bottle experiment. At the end of the experiment in the first area, the light bottle at a depth of 10 meters had 5.1 milligrams of oxygen in it while the dark bottle had 2.2 milligrams in it. At the end of the experiment in the second area the light bottle at a depth of 10 meters had 4.5 milligrams of oxygen in it while the dark bottle bad 1.1 milligrams in it. Which area has the higher net productivity?