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Predator upon a Flower

Predator upon a Flower

Life History and Fitness in a Crab Spider

Douglass H. Morse

ISBN 9780674024809

Publication date: 06/01/2007

In the crab spider, Misumena vatia, Douglass H. Morse and his colleagues found an ideal species on which to test basic questions associated with lifetime fitness. From the moment a female crab spider selects a flower on which to sit and wait for her prey, there unfolds a cascade of lifetime fitness variables that determine her evolutionary success. Did she choose a flower that attracts suitable prey? Will she encounter a competitor or predator? Will she survive long enough to breed, and will her offspring contribute to the gene pool? Ecologists had previously identified variables that shape populations, but lacked the experimental data needed to make comprehensive tests of individuals that made different foraging decisions. Morse found that Misumena is particularly well suited to both field study and laboratory experiments. Over the last 25 years, his simple yet elegant experiments have contributed to our understanding of lifetime fitness and helped to develop study techniques that can be applied to animals with other, more complex, life histories. Predator upon a Flower recounts these influential discoveries in a gracefully crafted narrative that moves ever outward from individuals to communities to ecosystems, and concludes by suggesting directions for future research in spider biology.


  • Predator upon a Flower is the result of half a lifetime’s devotion to the behavior of crab spiders—vicious predators that lurk on flowers and jump out at their prey… It will also become a classic of its kind, summarizing a distinctive approach to the biology of an intriguing organism.

    —Matthew Cobb, Times Literary Supplement


  • Douglass H. Morse is Hermon Carey Bumpus Professor of Biology, Brown University.

Book Details

  • 392 pages
  • 6-1/8 x 9-1/4 inches
  • Harvard University Press

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