Sex differential nectar secretion in protandrous Alstroemeria aurea (Alstroemeriaceae): Is production altered by pollen removal and receipt?

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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 sec...

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Autores principales:	Aizen, M.A., Basilio, A.
Formato:	JOUR
Materias:	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
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00029122_v85_n2_p245_Aizen
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

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spelling	todo:paper_00029122_v85_n2_p245_Aizen2023-10-03T13:54:39Z Sex differential nectar secretion in protandrous Alstroemeria aurea (Alstroemeriaceae): Is production altered by pollen removal and receipt? Aizen, M.A. Basilio, A. 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 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. Fil:Basilio, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00029122_v85_n2_p245_Aizen
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	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
spellingShingle	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 Aizen, M.A. Basilio, A. Sex differential nectar secretion in protandrous Alstroemeria aurea (Alstroemeriaceae): Is production altered by pollen removal and receipt?
topic_facet	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
description	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.
format	JOUR
author	Aizen, M.A. Basilio, A.
author_facet	Aizen, M.A. Basilio, A.
author_sort	Aizen, M.A.
title	Sex differential nectar secretion in protandrous Alstroemeria aurea (Alstroemeriaceae): Is production altered by pollen removal and receipt?
title_short	Sex differential nectar secretion in protandrous Alstroemeria aurea (Alstroemeriaceae): Is production altered by pollen removal and receipt?
title_full	Sex differential nectar secretion in protandrous Alstroemeria aurea (Alstroemeriaceae): Is production altered by pollen removal and receipt?
title_fullStr	Sex differential nectar secretion in protandrous Alstroemeria aurea (Alstroemeriaceae): Is production altered by pollen removal and receipt?
title_full_unstemmed	Sex differential nectar secretion in protandrous Alstroemeria aurea (Alstroemeriaceae): Is production altered by pollen removal and receipt?
title_sort	sex differential nectar secretion in protandrous alstroemeria aurea (alstroemeriaceae): is production altered by pollen removal and receipt?
url	http://hdl.handle.net/20.500.12110/paper_00029122_v85_n2_p245_Aizen
work_keys_str_mv	AT aizenma sexdifferentialnectarsecretioninprotandrousalstroemeriaaureaalstroemeriaceaeisproductionalteredbypollenremovalandreceipt AT basilioa sexdifferentialnectarsecretioninprotandrousalstroemeriaaureaalstroemeriaceaeisproductionalteredbypollenremovalandreceipt
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Sex differential nectar secretion in protandrous Alstroemeria aurea (Alstroemeriaceae): Is production altered by pollen removal and receipt?

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