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A key ecological trait drives the evolution of monogamy in a Peruvian poison frog.

Jason L. Brown East Carolina University. 2009

Dissertation Abstracts International 70-08B.

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  • 題名:
    A key ecological trait drives the evolution of monogamy in a Peruvian poison frog.
  • 著者: Jason L. Brown
  • East Carolina University.
  • 主題: Biology, Ecology
  • 所屬期刊: Dissertation Abstracts International 70-08B.
  • 描述: There is considerable debate concerning the ecological and social factors that promote the evolution of monogamy. I report on an unusual example in which a simple change in an ecological trait (phytotelm pool size for tadpole rearing) is correlated with the evolution of biparental care and monogamy. Detailed behavioral observations and ecological surveys revealed that D. variabilis uses large phytotelmata for tadpole rearing, has uniparental male care and a promiscuous mating system. In contrast, D. imitator uses small phytotelmata for tadpole rearing and exhibits social monogamy, pair-bonding and biparental care with tadpole provisioning. Pool choice experiments demonstrate that these species show opposite size preferences of phytotelm for tadpole deposition. Competition experiments show that D. variabilis tadpoles are better adapted for competition and cannibalism than D. imitator tadpoles.
    These results support the hypothesis that phytotelmata size mediated a tradeoff between nutrition and the risks of predation and competition. This tradeoff likely was a critical factor in the transition to biparental care from male parental care ancestor in Peruvian poison frogs. In particular, the use of very small pools is limited by the availability of nutrients, but also has reduced the risk of predation and competition. In species with male-only care (i.e. D. variabilis), tadpoles are not fed after they are deposited, which limits their survival to pools with adequate food (i.e. larger pools). Biparental care allows the use of very small phytotelmata, because food limitations no longer constrain the size of pool used for larval rearing and those species likely experienced a dramatic reduction in interspecific competition, particularly when these pools represented an unexploited resource.
  • 出版者: Thesis (Ph.D.)--East Carolina University, 2009.
  • 建立日期: 2009
  • 格式: 140 p..
  • 語言: 英文
  • 識別號: ISBN9781109307511
  • 資源來源: NUTN ALEPH
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