1985问题A 动物群体生态模型
自然界中某些动物群体生活在资源有限的环境下，即具有有限的食物，生存空间和水等等。试选择一种鱼类或一种哺乳动物(例如北美矮种马、鹿、免、鲑鱼、带条纹的欧洲鲈色等)。以及一个你能获得所需数据的生存环境，制定一个获取该种动物的最佳方案。
Choose a fish or mammal for which appropriate data are available to model it accurately. Model the animal's natural interactions with its environment by expressing population levels of different groups in terms of the significant parameters of the environment. Then adjust the model to account for harvesting in a form consistent with the actual method by which the animal is harvested. Include any outside constraints imposed by food or space limitations that are supported by the data. Consider the value of the various quantities involved, the number harvested, and the population size itself, in order to devise a numerical quantity that represents the overall value of the harvest. Find a harvesting policy in terms of population size and time that optimizes the value of the harvest over a long period of time. Check that the policy optimizes that value over a realistic range of environmental conditions.
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