BIOB50H3 Lecture Notes - Lecture 4: Red Queen Hypothesis, Net Energy Gain, Diminishing Returns
8 Sep 2017
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Timing of reproduction: number of times to reproduce. Semelparity initially invest all energy into growth, development, and storage, followed by one massive (and fatal) reproductive bout; reproduce only once in lifetime. Iteroparity produce fewer offspring at any one time, repeat reproduction throughout lifetime: number and size of offspring. Insects, other invertebrates, some vertebrates ( shes, some amphibians), many plants. Perennial semelparity is favoured when organisms are long-lived, and when the interval between favourable years is long. Includes century plants (also grow clonally), paci c salmon, dragon ies, cicadas, bamboo. Most vertebrates, perennial herbaceous plants, shrubs, trees, annuals that reproduce multiple times in one breeding season (have multiple seasons), most large mammals. Adaptive when conditions are favourable or predictable. Longer lifespans: survive as adults, can target reproductive efforts to favourable times (continuous breeders that can breed at any time vs. breeding season where you can only breed during certain seasons)
