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Turtle Nesting Patterns on Jupiter Island, Florida

Explore the nesting distribution of different turtle species along the eastern coastline of Florida, focusing on Jupiter Island. Understand the factors affecting population growth and the limitations on population size.

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Turtle Nesting Patterns on Jupiter Island, Florida

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  1. Happy Wed! 9/8/2010 • State which species of turtle nests in the greatest numbers on Jupiter Island. • (1 mk) • (b) Compare the distribution of nesting in the three species of turtle along the eastern coastline of Florida. (2 mks)

  2. (a) loggerheads / Carettacaretta 1 • (b) all three species nest over the same range of latitudeson the same beaches/areas;density of loggerheads is greatest and leatherbacks is lowest;similar relative densities/numbers on the different beaches / latitudes;all three had most nests on Jupiter;more loggerheads at northern end of range /(Do not accept answers givingaround 28 (°N) / on Melbourne;) the range 26–28 or 26–30.) 2 max

  3. I’ll CHECK your IB Journal on quiz day for 5.1 and 5.3

  4. Don’t forget... • “Exercises” ?s as you read or after we’ve gone over in class • Make sure you GET IT • “Practice ?s” @ end of chapter— old exam ?s • Studying for quizzes/tests!

  5. 5.3Populations

  6. 5.3.1 Factors affecting pop size

  7. 5.3.2 Pop growth curves • MODEL • Change in pop size over time • Pop expanding into a habitat offering INITIAL LOW RESISTANCE or LOW LIMITING FACTORS A-Exp = rapid pop growth rate B-slowing but still high C-plateau = pop remains stable w/time; slight oscillations

  8. 5.3.3 Phases of pop growth curve…details! EXPONENTIAL PHASE • Low/reduced limiting factors • Pop expands exponentially into hab. @ 2n where n= # of generations • natality + imm. > mortality + emigr. • Note that it does not mean that death/ emigration= 0 !!!

  9. When do you observe exp. phase in nature? Pop of germinating annual plants in new season Bacterial pop @ onset of infection Succession—any species’ pop entering previously uninhabited area

  10. 5.3.3 TRANSITION PHASE • Resources reduced, become limiting • Competition…not all survive • NATURAL SELECTION! •  lower rate of increase in pop

  11. 5.3.3 POPULATION PLATEAU • Pop remains constant over time/generations • Natality + imm = mortality + emig • Pop size determined by CARRYING CAPACITY of habitat @ that time

  12. What factors affect the rate of growth of a population?

  13. What factors LIMIT pop growth of a species?

  14. 5.3.4 Factors limiting pop growth • With unltd resources, pop would keep increasing…exponentially! • REALITY CHECK! • Environmental resistance limits it & determines carrying capacity • Shortage of food/prey • Predation, parasitism • Disease • Accumulation of waste • Shortage of space/territory

  15. Food for Thought...

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