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Abstract:

We examined diurnal and nocturnal nectar secretion across sexual stages in protandrous Alstroemeria aurea, a bumble bee-pollinated herb with long-lived flowers native to the southern Andes. We found the following patterns: (1) most nectar was produced diurnally and (2) three times more sugar was secreted during the male than female phase, not only because the male phase lasted longer but also because the rate of nectar production was higher. This 3:1 ratio in nectar production matched the ratio of the minimum number of bumble bee visits required on average to saturate male (pollen removal) vs. female (seed set) functions. Standing crop of nectar, on the other hand, did not differ greatly between male- and female-stage flowers left open to visitors, because the high-production male-phase flowers were visited more frequently than female-phase flowers. In an experiment concurrent with the repeated nectar sampling of individual flowers over their life-span, we removed pollen from anthers or deposited pollen on stigmas by hand. Neither treatment, designed to mimic effects of visits by Alstroemeria's native bumble bee pollinator, affected nectar production. The absence of plasticity in nectar secretion in relation to pollination events may reflect a low cost of nectar production, or may result from developmental constraints related to the evolution of the synchronous protandry that characterizes A. aurea.

Registro:

Documento: Artículo
Título:Sex differential nectar secretion in protandrous Alstroemeria aurea (Alstroemeriaceae): Is production altered by pollen removal and receipt?
Autor:Aizen, M.A.; Basilio, A.
Filiación:Departamento de Ecología, Universidad Nacional del Comahue, Unidad Postal Universidad, 8400 Bariloche, Río Negro, Argentina
Departamento de Biología, Facultad de Ciencias Exactas Y Naturales, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina
Palabras clave:Alstroemeria aurea; Alstroemeriaceae; Bumble bees; Male and female functions; Nectar secretion; Plasticity; Pollen removal and deposition; Protandry; flower visiting; nectar; secretion; temporal variation; Andes; South America; Alstroemeria aurea
Año:1998
Volumen:85
Número:2
Página de inicio:245
Página de fin:252
DOI: http://dx.doi.org/10.2307/2446312
Título revista:American Journal of Botany
Título revista abreviado:Am. J. Bot.
ISSN:00029122
CODEN:AJBOA
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_00029122_v85_n2_p245_Aizen.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00029122_v85_n2_p245_Aizen

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Citas:

---------- APA ----------
Aizen, M.A. & Basilio, A. (1998) . Sex differential nectar secretion in protandrous Alstroemeria aurea (Alstroemeriaceae): Is production altered by pollen removal and receipt?. American Journal of Botany, 85(2), 245-252.
http://dx.doi.org/10.2307/2446312
---------- CHICAGO ----------
Aizen, M.A., Basilio, A. "Sex differential nectar secretion in protandrous Alstroemeria aurea (Alstroemeriaceae): Is production altered by pollen removal and receipt?" . American Journal of Botany 85, no. 2 (1998) : 245-252.
http://dx.doi.org/10.2307/2446312
---------- MLA ----------
Aizen, M.A., Basilio, A. "Sex differential nectar secretion in protandrous Alstroemeria aurea (Alstroemeriaceae): Is production altered by pollen removal and receipt?" . American Journal of Botany, vol. 85, no. 2, 1998, pp. 245-252.
http://dx.doi.org/10.2307/2446312
---------- VANCOUVER ----------
Aizen, M.A., Basilio, A. Sex differential nectar secretion in protandrous Alstroemeria aurea (Alstroemeriaceae): Is production altered by pollen removal and receipt?. Am. J. Bot. 1998;85(2):245-252.
http://dx.doi.org/10.2307/2446312