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Conservation implications of the reproductive ecology of Agalinis acuta (Scrophulariaceae)

Neel, Maile C.

American journal of botany, 2002-06, Vol.89 (6), p.972-980 [Periódico revisado por pares]

United States: Botanical Soc America

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  • Título:
    Conservation implications of the reproductive ecology of Agalinis acuta (Scrophulariaceae)
  • Autor: Neel, Maile C.
  • Assuntos: Agalinis acuta ; Anthers ; Conservation ; Ecological genetics ; Ecology ; Endangered & extinct species ; endangered species ; Flower stigma ; Flowers ; Flowers & plants ; Fruits ; mating system ; Plant reproduction ; Plants ; Pollen ; Population ecology ; Population genetics ; Population size ; Reproductive Biology ; reproductive ecology ; Scrophulariaceae
  • É parte de: American journal of botany, 2002-06, Vol.89 (6), p.972-980
  • Notas: The author thanks S. von Oettingen (U.S. Fish and Wildlife Service), C. Gault (Waquoit Bay National Estuarine Research Reserve), C. Weidman (Waquoit Bay National Estuarine Research Reserve), and P. Somers (Massachusetts Natural Heritage and Endangered Species Program) for permission to conduct this work; P. Polloni for assistance with field work; J. Hull and D. Wagner, and F. C. Thompson (Systematic Entomology Laboratory, ARS, USDA, Smithsonian Institution) for identifying insect specimens; T. Clark for
    mailen@forwild.umass.edu
    Phone: (508) 548‐3705 ext. 6634; FAX: (413) 545‐4358
    A. acuta
    illustrations; and M. Cummings, E. Elle, L. McInerney, and P. Polloni for helpful suggestions on earlier versions of this manuscript. This work was partially funded by the Eastern Regional Office of the U.S. Fish and Wildlife Service.
    ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
  • Descrição: Reproductive ecology of Agalinis acuta was investigated by examining potential for self-fertilization before and at anthesis, reproductive output from outcrossed vs. selfed matings, and effects of browsing, plant size, and conspecific plant density on seed and fruit production. These features of a plant species can provide indirect information pertinent to conservation such as patterns and maintenance of genetic diversity, risk associated with inbreeding depression, and changes in pollinator abundance or effectiveness. The species is self-compatible, with 97% of selfed flowers setting fruit; pollinators were not required for reproduction. However, seed set in self-pollinated fruits averaged 17-20% less than that in open-pollinated fruits. Geitonogamous and facilitated selfing are possible throughout anthesis and autonomous selfing is possible late in anthesis as corollas abscise. Delaying self-pollination until after outcrossing opportunities likely limits selfing rates and thus reduces risks associated with inbreeding but allows reproduction in absence of pollinators. Supplementing pollen on open-pollinated flowers yielded no additional seed set over controls. Neither early-season browsing of primary stems nor conspecific plant density had significant effects on number of fruits per plant, on fruit size, or on number of seeds from open-pollinated flowers. Currently, reproduction appears to be high (about 2400 seeds/plant), and future risks due to lack of genetic diversity are likely low.
  • Editor: United States: Botanical Soc America
  • Idioma: Inglês
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