Little interspecific pollen transfer despite overlap in pollinators between sympatric Aeonium (Crassulaceae) species pairs

Esfeld, Korinna; Koch, Marcus A.; Seifan, Merav; Thiv, Mike

doi:10.1016/j.flora.2008.10.002

Cited by 11 publications

(16 citation statements)

References 60 publications

(115 reference statements)

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“…It is rather the whole inflorescence that functions as the unit of attraction, and differences in inflorescences signals, as the distinct colors observed for Euterpe edulis and E. espiritosantensis, may contribute to reproductive isolation mechanisms as observed for other palms species too (Knudsen, 1999). The pollinator behavior, such as floral preference and constancy during a foraging bout, is more important than the fact of a shared pollinator itself in limited pollen transfer between the species (Esfeld et al, 2009;Yang et al, 2007). Despite relative visitation rates of insects, natural fruit-set was low for E. edulis and E. espiritosantensis, as well as the fruit-set from hand-pollination.…”

Section: Reproductive Biology and Isolationmentioning

confidence: 99%

“…Nevertheless, even distinct species could be characterized by substantial but not necessarily complete reproductive isolation (Wendt et al, 2001;Esfeld et al, 2009). Hybridization may be a transient phase of evolution, during sympatric speciation and reinforcement; and sympatric distribution can arise from sympatric speciation (Coyne and Orr, 2004).…”

Section: Morphological Species Boundaries and Conservation Biologymentioning

confidence: 99%

“…Plant hybridization is a common event in nature (Rieseberg and Carney, 1998), especially among related species that share pollinators (e.g., Esfeld et al, 2009;Parrish et al, 2003;Wendt et al, 2001). Hybrid development does not mean that the taxa involved are only one species (Coyne and Orr, 2004).…”

Section: Introductionmentioning

confidence: 99%

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An evaluation of the species boundaries of two putative taxonomic entities of Euterpe (Arecaceae) based on reproductive and morphological features

Wendt

Cruz

Demuner³

et al. 2011

Flora - Morphology, Distribution, Functional Ecology of Plants

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Section: Reproductive Biology and Isolationmentioning

confidence: 99%

Section: Morphological Species Boundaries and Conservation Biologymentioning

confidence: 99%

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An evaluation of the species boundaries of two putative taxonomic entities of Euterpe (Arecaceae) based on reproductive and morphological features

Wendt

Cruz

Demuner³

et al. 2011

Flora - Morphology, Distribution, Functional Ecology of Plants

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“…2011). If the sympatric co‐flowering species are phylogenetically closely related and present similar floral morphologies and rewards, a stronger competition for pollinators may be expected, as well as interspecific pollen transfers that may lead to hybridisation (Kwak 1978; Esfeld et al. 2009; Field et al.…”

Section: Introductionmentioning

confidence: 99%

Pollen dispersal and fruit production in Vaccinium oxycoccos and comparison with its sympatric congener V. uliginosum

et al. 2012

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Investigating plant-pollinator interactions and pollen dispersal are particularly relevant for understanding processes ensuring long-term viability of fragmented plant populations. Pollen dispersal patterns may vary strongly, even between similar congeneric species, depending on the mating system, pollinator assemblages and floral traits. We investigated pollen dispersal and fruit production in a population of Vaccinium oxycoccos, an insect-pollinated shrub, and compared the pollen dispersal pattern with a co-flowering, sympatric congener, V. uliginosum. We examined whether they share pollinators (through interspecific fluorescent dye transfers) and may differently attract pollinators, by comparing their floral colour as perceived by insects. Fluorescent dyes were mainly dispersed over short distances (80% within 40.4 m (max. 94.5 m) for V. oxycoccos and 3.0 m (max. 141.3 m) for V. uliginosum). Dye dispersal in V. oxycoccos was not significantly affected by plant area, floral display or the proximity to V. uliginosum plants. Interspecific dye transfers were observed, indicating pollinator sharing. The significantly lower dye deposition on V. oxycoccos stigmas suggests lower visitation rates by pollinators, despite higher flower density and local abundance. The spectral reflectance analysis indicates that bees are unlikely to be able to discriminate between the two species based on floral colour alone. Fruit production increased with increasing floral display, but was not affected by proximity to V. uliginosum plants. Our study highlights that fragmented populations of V. oxycoccos, when sympatric with co-flowering V. uliginosum, might incur increased competition for the shared pollinators in the case of pollination disruption, which might then reduce outcrossed seed set.

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“…Each bat species may also have a preference for a cactus species. For example, Esfeld et al (2009) found that four Aeonium (Crassulaceae) species sharing pollinators received mainly conspecific pollen, maybe as a result of floral preference by pollinators and foraging constancy. However, based on the results of hand and natural pollination, it appears that to minimize competition for pollinators, the two sympatric cactus species need to maximize bat visits.…”

Section: Effect Of Mixed Pollen Load On the Two Cactus Speciesmentioning

confidence: 99%

Effects of mixed‐species pollen load on fruits, seeds, and seedlings of two sympatric columnar cactus species

Petit

2011

Ecological Research

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Two sympatric species of columnar cacti on Curac¸ao, Netherlands Antilles, share bat pollinators, overlap in flowering phenology, and are floral homologues. Leptonycteris curasoae curasoae and Glossophaga longirostris elongata (Chiroptera: Glossophaginae) visit flowers of Stenocereus (syn. Ritterocereus) griseus and Subpilocereus (syn. Cereus) repandus on the same nights; these visits may promote interference competition between cactus species. I studied the effect of heterospecific (mixed) pollen loads on fruit and seed set, fruit and seed size and mass, germinated seeds at 5 weeks, and seedling survival at 7 months in relation to hand pollination with intraspecific pollen and natural pollination. Hand pollination seemed to limit pollen loads available for pollination. Under these conditions, natural pollination tended to produce the most fruits and seeds, and the largest fruits (but lightest seeds); mixed pollination was the least effective treatment (fruit set was significantly greater for St. griseus in natural than mixed pollination; fruit volume was greater in natural than mixed pollination for S. repandus, and seed number and fruit mass were larger in intraspecific than in mixed pollination). Aspects of natural pollination, possibly repeated visits, compensated for the negative impact of interspecific pollen loads under pollen limitation, with positive impacts on the carrying capacity of cacti for frugivores. Seed mass from natural pollination was negatively correlated with seed number only for St. griseus. Germination success was not correlated with seed mass, but seedling survival at 7 months was for S. repandus. The two species do not seem to compete through pollen interference when pollinator visits are relatively frequent.

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Little interspecific pollen transfer despite overlap in pollinators between sympatric Aeonium (Crassulaceae) species pairs

Cited by 11 publications

References 60 publications

An evaluation of the species boundaries of two putative taxonomic entities of Euterpe (Arecaceae) based on reproductive and morphological features

An evaluation of the species boundaries of two putative taxonomic entities of Euterpe (Arecaceae) based on reproductive and morphological features

Pollen dispersal and fruit production in Vaccinium oxycoccos and comparison with its sympatric congener V. uliginosum

Effects of mixed‐species pollen load on fruits, seeds, and seedlings of two sympatric columnar cactus species

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