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State which species of turtle nests in the greatest numbers on Jupiter Island. (1 mk )

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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 ). (a) loggerheads / Caretta caretta 1

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slide1

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)
slide2

(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
don t forget
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 3 2 pop growth curves
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

5 3 3 phases of pop growth curve details
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 !!!
when do you observe exp phase in nature
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

5 3 3 transition phase
5.3.3 TRANSITION PHASE
  • Resources reduced, become limiting
  • Competition…not all survive
    • NATURAL SELECTION!
  •  lower rate of increase in pop
5 3 3 population plateau
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
5 3 4 factors limiting pop growth
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
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