Explain the goals of traditional fisheries management. What approach do scientists think would improve current management techniques?
What will be an ideal response?
For decades, fisheries management has been based on scientific assessments and has sought to allow maximum sustainable yield. Historically, fisheries managers have studied fish population biology and used that knowledge to regulate the timing of harvests, the techniques used to catch fish, and the scale (size) of the harvest. The goal was to allow for maximal harvests of particular populations while keeping fish available for the future. If data indicated that current yields looked unsustainable, managers might limit the number or total mass of that fish species that could be harvested or might restrict the type of gear fishers can use. Numerous marine scientists and some managers now suggest a shift away from management of individual fish species and toward viewing marine resources as elements of larger ecological systems. This means considering the effects of fishing practices on habitat quality, on interspecific interactions such as trophic relationships, and on other ecological factors that may have indirect or long-term effects on populations.
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Which of the following statements regarding a nucleon is true?
A) Attraction between nucleons changes their mass. B) The mass of a nucleon depends on which nucleus it is in. C) Some of the mass of a nucleon can be converted into energy by breaking certain nuclei. D) both A and C E) all of the above
Rapid climate changes during the Late Pleistocene may have caused extinctions of some large
mammals. Indicate whether the statement is true or false.
During a period when the earth's orbital tilt is at a minimum, which would probably not be true?
a. there should be less seasonal variation between summer and winter b. more snow would probably fall during the winter in polar regions c. there would be a lesser likelihood of glaciers at high latitudes d. there would be less seasonal variations at middle latitudes
All of China's major manufacturing regions are in the ________ half of the country
A) northern B) southern C) eastern D) western