Breeding system and pollen limitation in the masting tree Sorbus aucuparia L. (Rosaceae) in the NW Iberian Peninsula

Pías, Beatriz; Guitián, Pablo

doi:10.1016/j.actao.2005.08.005

Cited by 61 publications

(39 citation statements)

References 37 publications

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“…The rarity of pollen grains other than those of I. woodii on bees caught at I. woodii flowers suggests high fidelity of bees to this plant species. A synchronous monocarp and a masting tree that are animal-pollinated also attracted generalist insect pollinators (Pías & Guitián 2006;Sharma et al 2008).…”

Section: Discussionmentioning

confidence: 99%

“…Notwithstanding the abundance of mixed-mating strategies amongst plants with less specialised life histories, theoretical justification for reproductive assurance remains elusive, and pathways for evolution of the strategy unclear (Goodwillie et al 2005;Johnston et al 2009). Mixed mating has been demonstrated in an animal-pollinated synchronous monocarp (Sharma et al 2008), whereas the animal-pollinated masting tree Sorbus aucuparia is an obligate outcrosser (Pías & Guitián 2006). Ghazoul & Satake (2009) argued that production of non-viable selfed seed may be beneficial to masting trees by facilitating satiation of seed predators.…”

Section: Introductionmentioning

confidence: 99%

“…Animal pollination can be quite effective among plants occurring at low density (Borges et al 2003;Byrne et al 2007), potentially eliminating the selective advantage of masting. Nevertheless, animal pollination is a feature of some masting plants (Pías & Guitián 2006), of a number of long-lived monocarps (Aker 1982;Young 1982;Arizaga et al 2000;Price et al 2008) and of at least one long-lived synchronous monocarp (Sharma et al 2008).…”

Section: Introductionmentioning

confidence: 99%

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Pollination ecology of Isoglossa woodii, a long‐lived, synchronously monocarpic herb from coastal forests in South Africa

Griffiths¹,

Tsvuura²,

Franklin³

et al. 2010

Plant Biology

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Synchronous monocarpy in long‐lived plants is often associated with pollination by wind, in part because infrequent mass flowering may satiate pollinators. Selfing in synchronous monocarps may provide reproductive assurance but conflict with the benefits of outcrossing, a key evolutionary driver of synchrony. We predicted that animal‐pollinated species with synchronous flowering would have unspecialised flowers and attract abundant generalised pollinators, but predictions for selfing and outcrossing frequencies were not obvious. We examined the pollination biology of Isoglossa woodii (Acanthaceae), an insect‐pollinated, monocarpic herb that flowers synchronously at 4–7‐year intervals. The most frequent visitor to I. woodii flowers was the African honeybee, Apis mellifera adansonii. Hand‐pollination failed to enhance seed production, indicating that the pollinators were not saturated. No seed was set in the absence of pollinators. Seed set was similar among selfed and outcrossed flowers, demonstrating a geitonogamous mixed‐mating strategy with no direct evidence of preferential outcrossing. Flowers contained four ovules, but most fruits only developed one seed, raising the possibility that preferential outcrossing occurs by post‐pollination processes. We argue that a number of the theoretical concerns about geitonogamous selfing as a form of reproductive assurance do not apply to a long‐lived synchronous monocarp such as I. woodii.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pollination ecology of Isoglossa woodii, a long‐lived, synchronously monocarpic herb from coastal forests in South Africa

Griffiths¹,

Tsvuura²,

Franklin³

et al. 2010

Plant Biology

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“…Multi-year data are valuable as periodic weather perturbations are the norm and perennial plants tend towards alternate year of fruit and seed production (e.g. Herrera et al 1998;Pías & Guitián 2006). Studies over multiple seasons are also necessary to truly understand the stability of the pollination service, because insect communities often show high temporal variation (Cane & Payne 1993;Roubik 2001) and habitatspecific temporal species turnover (Williams et al 2001;Cane et al 2005;Tylianakis et al 2005).…”

Section: (B) Research Needsmentioning

confidence: 99%

Importance of pollinators in changing landscapes for world crops

et al. 2006

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The extent of our reliance on animal pollination for world crop production for human food has not previously been evaluated and the previous estimates for countries or continents have seldom used primary data. In this review, we expand the previous estimates using novel primary data from 200 countries and found that fruit, vegetable or seed production from 87 of the leading global food crops is dependent upon animal pollination, while 28 crops do not rely upon animal pollination. However, global production volumes give a contrasting perspective, since 60% of global production comes from crops that do not depend on animal pollination, 35% from crops that depend on pollinators, and 5% are unevaluated. Using all crops traded on the world market and setting aside crops that are solely passively self-pollinated, windpollinated or parthenocarpic, we then evaluated the level of dependence on animal-mediated pollination for crops that are directly consumed by humans. We found that pollinators are essential for 13 crops, production is highly pollinator dependent for 30, moderately for 27, slightly for 21, unimportant for 7, and is of unknown significance for the remaining 9. We further evaluated whether local and landscape-wide management for natural pollination services could help to sustain crop diversity and production. Case studies for nine crops on four continents revealed that agricultural intensification jeopardizes wild bee communities and their stabilizing effect on pollination services at the landscape scale.

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“…Muitas plantas de importância econômica dependem de insetos para incrementar sua produção, e a polinização insuficiente resulta no insucesso reprodutivo e consequentemente no impacto econô-mico na fruticultura (PIAS; GUITIÁN, 2006). No entanto, não há dados suficientes na literatura que elucidem completamente se, em amoreira-preta, há alguma especialização quanto ao agente polinizador, bem como seu impacto na produção de frutos.…”

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Ecologia da polinização da amoreira-preta (Rubus sp) (Rosaceae) em Timbó-SC, Brasil

Mello

Orth

Moretto³

2011

Rev. Bras. Frutic.

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RESUMO -O presente trabalho verificou experimentalmente a ecologia da polinização da amoreira-preta (Rubus sp.). Objetivou-se confirmar a síndrome de polinização de Rubus sp., por meio de análise de seu sistema reprodutivo, quantificação da produção diária de néctar, levantamento da entomofauna que visita as flores da amoreira na área de estudo e análise do seu comportamento polinizador. Os experimentos foram realizados em uma área de cultivo de amoreira-preta, no mês de dezembro de 2005, município de Timbó (SC). Constatou-se que a maior taxa de frutificação (48,3 % ± 3,2) ocorreu via polinização livre, onde os insetos não foram excluídos. Foi verificada a ocorrência de autopolinização, porém com taxa inferior de frutificação (12,2% ± 4,9). A anemofilia não foi constatada na espécie. A avaliação da produção de néctar em Rubus sp. resultou em valores compatíveis com a síndrome de melitofilia. Os visitantes florais coletados e observados sobre as flores de Rubus sp. foram predominantemente abelhas da ordem Hymenoptera (97%), que iniciam, em menor número, a atividade de forrageamento às 8h, com pico de atividade às 12h e declinando até às 16h. As coletas resultaram numa amostragem de 1.360 abelhas, divididas em quatro famílias e 13 espécies. A família com maior riqueza de espécies (N = 7) foi Halictidae e a mais abundante foi Apidae, com 1.288 indivíduos. Em Apidae, houve o predomínio da espécie exótica Apis mellifera, cuja representação na amostra foi de 1.246 indivíduos. Os dados da abundância e as observações naturalísticas do seu comportamento da flor apontaram A. mellifera como o principal polinizador de Rubus sp., mas confirmam que as demais espécies de abelhas também participam na polinização de Rubus sp. Termos para indexação: Sistema reprodutivo, amora-preta, visitantes florais, néctar. POLLINATION ECOLOGY OF BLACKBERRY (Rubus sp.) (ROSACEAE) IN TIMBO (SC), BRAZILABSTRACT -The pollination ecology of the blackberry (Rubus sp.) was studied by means of determining its reproductive system, the analysis of flower's nectar production. Sampling the insects that visited the blackberry flower in a cultivated area and analyzing the pollination behavior. The experiments were carried out in an area of blackberry crop, in December of 2005 in the city of Timbó (SC), Southern Brazil. The highest fruit set (48.3% ± 3,2) occurred in the free pollination (natural) treatment where insects were not excluded. The occurrence of selfing was verified, however with lower fruit set (12.2% ± 4,9). Anemophily was not observed in the species. The nectar evaluation in Rubus sp. resulted in values compatible with the melittophily syndrome. Bees (Hymenoptera) were the main floral visitors collected and observed on the flowers of Rubus sp., representing 97% of the individuals. They initiate the foraging activity at 8 a.m., with a peak activity at 12 a.m. and declining until 4 p.m. In the survey were sampled 1.360 bees, belonging to four families and 13 species. Halictidae was the family with highest amount of species (N = 7) and Apidae mo...

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Breeding system and pollen limitation in the masting tree Sorbus aucuparia L. (Rosaceae) in the NW Iberian Peninsula

Cited by 61 publications

References 37 publications

Pollination ecology of Isoglossa woodii, a long‐lived, synchronously monocarpic herb from coastal forests in South Africa

Pollination ecology of Isoglossa woodii, a long‐lived, synchronously monocarpic herb from coastal forests in South Africa

Importance of pollinators in changing landscapes for world crops

Ecologia da polinização da amoreira-preta (Rubus sp) (Rosaceae) em Timbó-SC, Brasil

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