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Lecture 13

BIOL215 Lecture 13 Notes.pdf

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Biology (Sci)
BIOL 215
Neil Price

BIOL215 Lecture 13 Notes Population biology is the study of individuals from one species that live together in space and time (Book pg. 114) Basic demography is something that focuses on a species; not of a community Population is of a single species while community is formed of a few species interacting together in the same place and same time. Ecosystem incorporates the abiotic functions of communities in the same time and same place Population dynamics studies the "behavior" of populations such as increases and decreases in population size. Demography is the study of the age structure of population. It includes the study of death, birth, population growth, and population decrease When we're talking about demography, we must have a sense of the size of the population at a given time (initial time). We want to estimate how the population will grow to predict the population in the future. Very mathematical Consider births and immigration as factors that increase/brings individuals to a population Consider deaths and emigration as factors that decrease/take away individuals to a population Demography is the understanding of the balance between birth and death taking into account immigration and emigration Ecology means "the knowledge in the house" in Greek To measure populations: 1) census for humans, 2) quadrants for plants, 3) marked captures for birds, 4) marked capture (with tranquilizer) for deers See list of methods for measuring populations: pg. 120 Density of number of individuals per unit area is measure of population size. Individuals of small size are abundant on a small spatial scale and bigger individuals are less abundant The two most important tenants of demography are: death and birth Life table help to understand population growth. Life table is a table that records survivorship and mortality in a population • Cohort table: follows all the individuals born at the same time from birth to death (very precise, but complicated to do in nature because of long-lived species) • Static table: snapshot of a population over a short time interval. All individuals are of different ages See Table 8.3 to understand calculations for lx and qx A plot of number of survivors (Y-axis) vs. Age (X-axis) is a survivorship curve. It is used to understand how mortality changes with age
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