e-journal

Community-wide assessment of pollen limitation in hummingbird-pollinated plants of a tropical montane rain forest

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Background and Aims:
Although pollen limitation of reproduction (PL) has been widely studied, our understanding of its occurrence in tropical communities, especially for bird-pollinated plants, is underdeveloped. In addition, inclusion
of both quantity and quality aspects in studies of PL are generally lacking. Within hummingbird-pollinated
plants, a prediction was made for higher PL for the quality than quantity aspects and a minor effect of temporal variation because hummingbirds are constant and efficient pollen vectors but they may transfer low quality pollen.
Methods:
Field hand and open pollination experiments were conducted on 21 species in a tropical montane rain forest over 2 years. The quantity (fruit set and seeds per fruit) and quality (seed weight and germination) aspects
of reproduction were assessed as the response to open pollination relative to outcross hand pollination. The relationships between the effect size of quantityand quality aspects of reproduction and predictive plant features (self-incompatibility, autogamy, density and pollinator specialization level)were assessed with phylogenetic generalized linear models.
KeyResults:
Just over half of all the species expressedPLforone ormore response variables.Onaverage, the severity of PLwas strong for one quality variable (seed germination; 0.83), but insignificant for another (seedweight; –0.03), and low to moderate for quantity variables (0.31 for seeds per fruit and 0.39 for fruit set). There was only a minor contribution of temporal variation to PL within the studied species. Common predictors of PL, i.e. phylogenetic relatedness, self-incompatibility, autogamy, plant density and pollinator specialization level, did not adequately explain variation in PL within this community.
Conclusions:
Despite the measurable degree ofPLwithin these hummingbird-pollinated plants, the causes of pollen quality and quantity insufficiency are not clear. Variables other than those tested may contribute to PL or causes of
PL may vary among species and cannot adequately be accounted for when assessed from the within-community
perspective.

Key words: Atlantic forest, Brazil, Itatiaia National Park, Neotropics, ornithophily, community, pollen limitation, pollination biology, hummingbird.

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Ketersediaan

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Informasi Detail

Judul Seri

Annals of Botany

No. Panggil

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Penerbit

Oxford : Oxford University Press on behalf of the Annals of Botany Company., 2013

Deskripsi Fisik

Annals of Botany 112: 903–910, 2013

Bahasa

English

ISBN/ISSN

10958290

Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

BIOLOGI

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

Versi lain/terkait

Lampiran Berkas

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