ENVS 202 1st EditionThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.Lecture 18 Outline of Last Lecture I. Population EcologyII. Fisheries and Sustainable HarvestOutline of Current Lecture I. Population and FisheriesII. Human Population GrowthCurrent LectureI. Population and FisheriesFor fisheries, we look at total growth rate, not per capita growthThe total growth rate peaks at intermediate population sizesGeorge’s Bank in New EnglandVery profitable fishing area since the 1800sSONAR was able to detect schools of fishLarger and more adept boats were built, technological advances begin vastly improving the fishing scene1976: US prohibits foreign vessels from going within a certain mileage of shoresOverfishing booms: so many ships on the waters that no more big catches were made by thelate 80sAuthorities began to issue restrictions to maintain healthy fishPositive feedback loop: fish stocks go down, fishers fish harder to make up for their losses, stocks go down even moreII. Human Population GrowthNot growing exponentiallyMDC and LDC are both growing, but growth rate is smallerWorld’s highest populations: China, India, US, Indonesia, Brazil, Pakistan, Bangladesh, Nigeria, Russia, JapanFactors influencing human population growthTotal fertility rate: estimate of the number of kids a woman will have in her childbearing years (15-45)When average growth is less than TFR, population goes downWhen average growth is more than TFR, population goes upThe world’s TFR is ~2 for right nowTFRs are coming down for the whole worldTransitions from:Pre-industrial: birth and death rates are high, big families, death and disease are commonAgricultural age: death rates drop, food is plentiful, people are healthyIndustrial era: birth rates drop, baby survival is high, women are working and having less childrenPost-industrial: birth and death rates meet up again but are lower than in the past, peopleare living longer, fewer babies are
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