ASSESSMENT OF PARASITE-MEDIATED SELECTION IN A HOST-PARASITE SYSTEM IN PLANTS

A two-year field study was conducted to evaluate the potential of two cactus species, Echinopsis chilensis and Eulychnia acida, to evolve defensive traits against the parasitic mistletoe Tristerix aphyllus (Loranthaceae). The adaptive value of host traits against parasitism was inferred through: (1) identification of the relevant characters of cacti to prevent infection, (2) evaluation of the fitness impact of parasitism on cacti, and (3) estimation of the linear and nonlinear selection coefficients on the relevant characters. Different lines of experimental and correlative evidence indicated that spine length was important in preventing individuals of the two cactus species from becoming parasitized. However, the impact of the mistletoe on cactus fecundity was contingent on the species involved. Even though parasitism decreased fruit production, seed number per fruit, and the total seed output in E. chilensis, low and nonsignificant linear and nonlinear gradients of selection were prevalent in this speci...

• Publication year

  2000

• Venue

  Ecology

• Publication date

  2000-06-01

• Fields of study

  Biology, Environmental Science

• Identifiers
  DOI 10.1890/0012-9658(2000)081[1554:AOPMSI]2.0.CO;2
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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