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LIFE HISTORY STRATEGY. Life History Strategy A suite of traits that improve an individual's chances of surviving and reproducing in a particular environment. COST/BENEFIT ANALYSIS. Energy commited to one function is not available for others.

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LIFE HISTORY STRATEGY

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LIFE HISTORY STRATEGY


Life History Strategy

A suite of traits that improve an individual's chances of surviving and reproducing in a particular environment


COST/BENEFIT ANALYSIS

Energy commited to one function is not available for others.

2.Every evolutionary ‘choice’ has costs and benefits

3.Every organism represents a compromise of a number of evolutionary ‘choices’


Macarthur and Wilson (‘70’s) - Theory of Island Biogeography

r strategists K strategists

Opportunistic

-rapidly colonizing, fast growth

Equilibrium

-slower colonizing, slow growth


Attributes of r and K - selected organisms


Attributes of r and K - selected organisms


Attributes of r and K - selected organisms


Attributes of r and K - selected organisms


Attributes of r and K - selected organisms


Attributes of r and K - selected organisms


Attributes of r and K - selected organisms


Attributes of r and K - selected organisms


Attributes of r and K - selected organisms

Productivity


Attributes of r and K - selected organisms

Productivity

Efficiency


r - K continuum

r-strategistK-strategist


r - K continuum

r-strategistK-strategist

Frequent disturbanceLess frequent disturbance


Aclonal Life History

recruitment

Sexual reproduction

Death


Clonal Life History

Sexual reproduction

recruitment

Fission

Fission

Fission

Death


Fertilization Patterns

1. External (no copulation)


Fertilization Patterns

1. External (no copulation)

Problems

Gamete output

Synchrony

Gamete dispersal

Gamete dilution


Fertilization Patterns

1. External (no copulation)

Problems

100

Gamete output

% success

Synchrony

Gamete dispersal

Gamete dilution

0.5 m

Distance between individuals


Fertilization Patterns

1. External (no copulation)

Allee Effect

Reproductive

rate

Number or Density


Fertilization Patterns

2. Internal (no copulation)

For oyster spawning video:www.umces.edu/ 2002Session/oyster.html


Fertilization Patterns

2. Internal (copulation)


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