Ecology Test 2 (a)

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Ecology Test 2 (a)
2013-11-11 14:15:53

Exam 2
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  1. Bet Hedging
    • Association of traits related to unpredictable juvenile mortality 
    • Maximizes probability of producing offspring during high juvenile survivorship.
  2. Carrying Capacity
    maximum population size of the species that the environment can sustain indefinitely, given the food, habitat,water and other necessities available in the environment
  3. demography
    encompasses the study of the size, structure, and distribution of populations, and spatial and/or temporal changes in them in response to birth, migration, aging and death.
  4. density dependence
    Often mortality hazards are said to be density dependent. Furthermore, resources grow lower with increasing population size.
  5. semelparity
    • reproductive strategy of an organism
    • A species is considered semelparous if it is characterized by a single reproductive episode before death, and iteroparous if it is characterized by multiple reproductive cycles over the course of its lifetime
  6. endemic
    The ecological state of being unique to a defined geographic location, such as an island, nation, county or other defined zone, or habitat type; organisms that are indigenous to a place are not endemic to it if they are also found elsewhere.
  7. generation time
    • generation time is correlated with body size.
    • big-bodied species have long generation times.
    • the effect of generation time through the relationship between generation time and fecundity and mortality is that species with long generation times cannot grow as quickly as species with short generation times
  8. Hermaphrodite
    • Self-compatible
    • Capable of self-fertilization
    • Do not rely on pollinators in order to make seeds
    • Still benefit from pollinators
    • increased quality of seeds through outcrossing
  9. Nicholson
    • Nicholson Experiment
    • The overall result of experiments was that whenever an experiment started with a few adults. The number of adults produced in the first generation was high.
  10. Leslie Matrix
    discrete, age-structured model of population growth that is very popular in population ecology.
  11. Stable-age distribution
    This age-structured growth model suggests a steady-state, or stable, age-structure and growth rate. Regardless of the initial population size, N0, or age distribution, the population tends asymptotically to this age-structure and growth rate. It also returns to this state following perturbation. The Euler–Lotka equation provides a means of identifying the intrinsic growth rate. The stable age-structure is determined both by the growth rate and the survival function (i.e. the Leslie matrix).