BIOE 370 1st Edition Lecture 18 Outline of Last Lecture I. Principle of allocation underlies life-history trade-offsOutline of Current Lecture II. Population DynamicsIII. Population Growth ModelsCurrent LectureIntroduction to Population Dynamics and Population Growth ModelsConsider an animal like Antechinus, Australian marsupial mouse. Antechinus are seasonal breeders that mature at age 1 year. Males mature, fight like mad, mate like mad, and all die (due to a huge pulse of the stress hormone corticosterone). Females live a few weeks longer, but just long enough to raise a litter, then die after weaning. This life history shows: - discrete breeding seasons- nonoverlapping generations - semelparous life history The marsupial mouse has unusual life-history for a mammal (though it’s common among invertebrates). A more typical mammalian life history is shown by African wild dogs, which breed one a year (in the dry season, when prey is more easily caught), but individuals breed repeatedly in a lifetime, and have overlapping generations.^ Exponential or Density-Independent Growth - Always temporary in the “real-world” Shows that exponential growth is
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