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RU BL 262 - Assignment

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BIOLOGY 262, PRINCIPLES OF BIOLOGY: ORGANISMIC BIOLOGY POPULATION ECOLOGY PRACTICE/REVIEW – NOT A GRADED ASSIGNMENT The following are data collected for the 1978 cohort of the cactus finch (Geospiza fortis) on Isla Daphne in the Galapagos Islands. These data were used as part of a published study. Fill in each empty column (see p. 1039). Age in years Number Alive Survivorship Mortality Survivorship Rate Mortality Rate 0 (1978) 216 1 (1979) 91 2 (1980) 78 3 (1980) 70 4 (1981) 65 5 (1982) 62 6 (1983) 42 7 (1984) 23 8 (1985) 15 9 (1986) 14 10 (1987) 11 11 (1988) 10 12 (1989) 4 13 (1990) 3 Appropriately graph the survivorship you calculated above for this cohort. (Remember, time is usually placed on the x-axis.) Graph the mortality rate you calculated above for this cohort. Survivorship of 1978 Cohort (1978-1990) Mortality Rate of 1978 Cohort (1978-1990) What type of survivorship curve is this? What might explain the above pattern in mortality rate?The following are data collected for the cactus finch (Geospiza fortis) on Isla Daphne in the Galapagos Islands from 1978 to 1991. Data were taken at a time of year when populations were near their smallest (meaning after mortality of many of the young hatched that year). Appropriately graph the population size of these finches. (Remember, time is usually placed on the x-axis.) (see p. 1045). Population Size Population Size 1978-1990 Year N (pop. size) 1978 101 1979 148 1980 197 1981 150 1982 235 1983 229 1984 470 1985 268 1986 62 1987 48 1988 145 1989 100 1990 70 Compare the population size graph to the mortality rate graph you previously calculated. What might be a plausible explanation for the above pattern in population size and mortality rate? The following are data collected for the chorus frogs (Pseudacris triseriata) in two ponds on an Island in Lake Superior. Appropriately graph the population size of the tadpoles. Populations were sampled every week for three weeks. Dragonfly nymphs consume tadpoles. Dragonfly nymphs were added to one pond and not to a second pond to watch the effects on existing populations of tadpoles in these ponds. Graph the data appropriately. (Remember, time is usually placed on the x-axis.) (see p. 1049). Population Size Control Pond Treatment Pond Year No nymphs Nymphs Start (1) 295 142 Day 7 205 18 Day 14 182 2 Day 21 164 0 Explain the effect of dragonfly nymphs on chorus frog tadpole populations. Given this, how would the distribution of dragonfly nymphs affect the distribution of chorus frog


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RU BL 262 - Assignment

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