Ecology 1000, week 1 notes
Ecology 1000, week 1 notes ECOL 1000
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This 1 page Class Notes was uploaded by Jennifer Veliz on Tuesday January 19, 2016. The Class Notes belongs to ECOL 1000 at University of Georgia taught by Dr. Scott Connelly in Winter 2016. Since its upload, it has received 33 views. For similar materials see Environmental Issues in Business at University of Georgia.
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Date Created: 01/19/16
Ecology 1000 Week one Ecology- branch of biology that studies the relations of organisms to one another and to their physical surroundings. Population Growth • You can visit www.census.gov/popclock/ for a current count of the world’s population. v David Attenborough’s video notes: • Population growth is becoming a problem. • To “fix” this, population birth must decrease and population death must increase. • Too many people in this earth, and not enough food regardless of technology. • We shouldn’t ignore population growth. • The first population growth happened during the pre-agricultural period due to a global migration. • Second population growth happened during the agricultural period. • The third population growth happened during the industrial period since food production increase, and sanitation, medical care, and nutrition were improved. • Darwin once said that if organisms (animals, humans, etc.) don’t die, the earth would be completely covered with organisms. • Changes in population are caused by birth, death, immigration and emigration. (ΔN= B+I-D-E) N= population size • Models of population growth 1. Exponential (logistic) growth- used for populations with continuous (not seasonal) reproduction and/or overlapping generations 2. Geometric growth- used for populations with reproductions that occur at specific times. • The rate of change of a population is calculated by dN = rN dt dN/dt = rate of population size r=per capita growth rate N=population size • Population growth is rapid and independent of density.
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