Life Histories

Tradeoff: maturity vs longevity

Longer lifespan causes later age of maturity

Parity

Reproductive frequency during lifetime

Longevity

Lifespan

Fecundity

Number of offspring produced per reproductive event

Maturity

Age at first reproductive event

Tradeoff: fecundity vs longevity

Offspring survival is lower for larger clutch sizes

How does high fecundity effect future reproduction?

Decreases due to demand to find food

Tradeoff: maturity vs fecundity

Less reproductive effort allows for greater adult survival , favours future reproduction

What period of reproduction would guppies with high predation choose for, how would this reflect in offspring?

Current earlier breeding , numerous and small offspring

Slow-fast continuum

Balance of offspring output and parental care

How do r and K influence offspring production and parental care

r favours high fecundity and K favours longevity in competition dense populations

Semelparous

Organisms breed once during lifetime

Iteroparous

Organisms breed many times during lifetime

When is iteroparity favoured

Timing offspring survival with periods of safe conditions , conserving energy for future reproduction

When is semelparity favoured

Organism that bears many offspring , energy not needed for parental care or survival