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Redwood (Sequoia sempervirens)
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Chapter 12 – Life Histories
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2Lifespan: 2,000 Yrs
Seed Production: Millions
Pacific Salmon
Salmon: Anadromous
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12Lifespan: 2-7 Years
Egg Production: Thousands
8 Mayfly Hatch
7 Mayfly (Adult)
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Adult Lifespan: One Day
Egg Production: Hundreds
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Lifespan: 2000 YearsSeed Production: Millions
Lifespan (Adult): 1 DayEgg Production: Hundreds
Lifespan: 2-7 YearsEgg Production: Thousands
Life History TraitsStudy of Adaptations that Influence …
• Reproductive Output
• Size of Offspring
• Growth Rate
• Age at Reproductive Maturity
• Competitive Ability
• Life Span
Available Energy is Limited
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A) OFFSPRING NUMBER VERSUS SIZE
LIFE HISTORY CHARACTERISTICS
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Life History Patterns
Fig. 12.6 in Molles 2006
Fig. 12.7 in Molles 2007
Life History Patterns
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Fig. 12.2 in Molles 2006
Fig. 12.4 in Molles 2006
Life History Patterns
B) Adult Survival and Reproductive Allocation
LIFE HISTORY CHARACTERISTICS
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Fig. 12.13 in Molles 2006
Life History Patterns
Fig. 12.15 in Molles 2006
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Life History Classification
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Age at first Reproduction: 3-4 years
Age at First Reproduction:7 years
REPRODUCTION
REPRODUCTION
GROWTH RATE
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COMPETETIVE ABILITY
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LIFESPAN
Available Energy is Limited
Table 12.1 in Molles 2006
r versus K Selection
R selected K selected
“Small and Fast” “Large and Slow”
• MacArthur and Wilson 1967 (Birds, Insects)
• Pianka 1970, 1972 (Lizards)
“Frequent Disturbance” “Infrequent Disturbance”
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