What does maximum sustained yield mean? What factors complicate its application?
What will be an ideal response?
Maximum sustained yield (MSY) is the "highest possible rate of use that the system can match with its own rate of replacement or maintenance." The problem with implementing MSY is that we do not know the highest recruitment rate for a species with a specified ecosystem but we make decisions as if we do know. The optimal population size to obtain MSY is one half of the size that it would be at the carrying capacity. We do not know an ecosystem's carrying capacity for various species. Additionally, the carrying capacity will vary from year to year. When the maximum sustained yield is exceeded, the availability of the resource declines.
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The action of processing plastic or aluminum cans into another usable product is called ____________________
Fill in the blanks with correct word
While Earth is estimated to be 4.6 billion years old, the oldest oceanic crust is approximately ________ years old
A) 1 billion B) 6,000 C) 2.5 billion D) 865 million E) 200 million
Which of the following statements about Grunion is correct?
A) Fertilized grunion eggs are ready to hatch about twenty days after spawning. B) Grunion are the only marine fish that comes completely out of water to spawn. C) Grunion are similar to salmon in that they return to their stream of birth to spawn. D) Grunion count on the highest spring high tide to bury their eggs with sand. E) Grunion spawn on the three or four nights prior to the highest spring high tide.
________ feedback tends to stabilize systems
A) Negative B) Exponential C) Positive D) Logarithmic E) Neutral