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12 Cards in this Set
- Front
- Back
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in __what year??___ 17 nations agree to let international Whaling Commission (IWC) set maximum catch in the Antarctic
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1946
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from ______ IWC sets annual "fixed" quotas for all whaling
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1949-1960
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in ____ the United Nations called for a cessation of whaling and the US Congress passed an Endanger Species Act
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1972
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whale sanctuaries were declared in the 1970s and '80s, and a general moratorium on commercial whaling, adoptd by IWC in 1982, took effect in _____
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1987 **no more commercial whaling
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r= instantaneous per capita growth rate and dN/dt= r(N) means
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exponential growth
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how does the logistic growth model looks like?
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S-shaped
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what does logistic growth model have to do with harvest quota?
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the logistic model inform harvesting quotas
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what is "fixed" quota?
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a set amount or limited amount of an animal can be capture
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what are the two important assumptions of harvest models
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1) harvested populations show density-dependent growth-- ex: removing a few indivs. will reduce the competition b/w those individuals and overtime they will grow back **so harvesting wont effect the animals pop. growth as long as i don't take too many away
(2) Harvest mortality is more "compensatory" than "additive" |
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compensatory mortality:
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removes prey that would otherwise die of other causes (e.g., starvation, disease)
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additive mortality
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removes prey in addition to those that would die of other causes **adding deaths to a population on top of natural death they would have die anyways
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dfdf
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dfgd
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