Distant gene flow in tropical trees

Chase, Michael R.; Möller, C.; Kesseli, Rick; Bawa, Kamaljit S.

doi:10.1038/383398a0

Cited by 184 publications

(150 citation statements)

References 10 publications

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“…Pollen dispersal curves in both habitats exhibited a fat-tailed distribution, indicating that even isolated trees received pollen from a relatively large number of pollen donors (i.e., 36). Past gene flow studies have focused on partly self-compatible species with unspecialized flowers (23,(37)(38)(39)(40)(41)(42)(43) and have occasionally found that isolated trees in agricultural landscapes receive pollen from a large number of distant sires (23,38). However, Africanized honey bees may have been the primary vectors of gene flow in these studies (23,24).…”

Section: Discussionmentioning

confidence: 99%

“…3). Deviations from nearest neighbor mating have been documented in breeding structure studies for trees in undisturbed tropical forests (44) and in human modified tropical landscapes (23,38), and they are most often attributed to asynchronous flowering, pollen carryover, and changes in pollinator flight behavior within more open habitats (reviewed in 14). M. affinis trees flower synchronously, and although intertree distances are longer in the shade coffee habitat, our analyses revealed that pollen dispersal distance was significantly influenced by habitat but not by degree of isolation.…”

Section: Discussionmentioning

confidence: 99%

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Native bees mediate long-distance pollen dispersal in a shade coffee landscape mosaic

Jha

Dick

2010

Proc. Natl. Acad. Sci. U.S.A.

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Coffee farms are often embedded within a mosaic of agriculture and forest fragments in the world's most biologically diverse tropical regions. Although shade coffee farms can potentially support native pollinator communities, the degree to which these pollinators facilitate gene flow for native trees is unknown. We examined the role of native bees as vectors of gene flow for a reproductively specialized native tree, Miconia affinis, in a shade coffee and remnant forest landscape mosaic. We demonstrate extensive crosshabitat gene flow by native bees, with pollination events spanning more than 1,800 m. Pollen was carried twice as far within shade coffee habitat as in nearby forest, and trees growing within shade coffee farms received pollen from a far greater number of sires than trees within remnant forest. The study shows that shade coffee habitats support specialized native pollinators that enhance the fecundity and genetic diversity of remnant native trees.A n estimated 13 million ha of tropical forest are destroyed every year (1) by the expansion of crops, pasture, and logging (1, 2). In deforested tropical regions, one of the most widely cultivated and economically valuable crops is coffee. Often grown adjacent to remnant forest patches, coffee covers over 11 million ha of land within many of the world's most biodiverse regions (3, 4). Intensively farmed "sun" coffee supports little native vegetation and can create an inhospitable matrix that isolates plant and animal populations living within forest fragments (3, 5). Alternatively, coffee grown under a canopy of overstory trees in the traditional "shade-grown style" can preserve ecological processes and provide farmers with ecosystem services (4, 5). For example, shade coffee farms serve as a habitat for migratory birds and nonmigratory bats, both of which provide farmers with pest control (6-8). Tropical animals living within shade coffee farms may also facilitate seed dispersal for native trees, thus providing opportunities for the maintenance of shade trees and future reforestation (9).However, pollination mutualisms may be particularly vulnerable to habitat alteration, however, and many tropical tree species are self-incompatible and dependent on animal pollinators for reproduction and gene flow (reviewed in 10, 11-14). Although some agricultural landscapes provide suitable habitat for pollinators (15-17), many agricultural practices negatively impact native pollinator communities (18)(19)(20). Agricultural landscapes can also have high densities of exotic honey bees (Apis mellifera scutellata), which may not provide pollinator services for reproductively specialized native plants (21, reviewed in ref. 22). Exotic honey bees can maintain gene flow in altered habitats for plants with unspecialized flowers and abundant nectar and/or pollen, even if a subset of the native pollinators is lost (reviewed in ref. 12; e.g., refs. 23, 24). However, loss of the native pollinators of reproductively specialized plants can lead to reduced genetic diversity and inbre...

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Native bees mediate long-distance pollen dispersal in a shade coffee landscape mosaic

Jha

Dick

2010

Proc. Natl. Acad. Sci. U.S.A.

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“…Like adult bumblebee males, they lead a solitary life and mostly visit flowers for nectar and consume no or only little pollen (Kevan and Baker 1983). Detailed information about pollen flow through non-bee pollinators is limited (Courtney, et al 1982;Nilsson, et al 1987;Chase, et al 1996) but the importance of these pollinators has repeatedly been emphasized (Weiss, 2001;Biesmeijer, et al 2006, Garibaldi, et al 2013. In fact, Herrera (1987) found pollinator effectiveness of some Lepidopteran pollinators higher than that of honeybees and surpassed only by a number of solitary bee species.…”

Section: Discussionmentioning

confidence: 99%

“…Butterflies also facilitated more outcrossing on Lavandula latifolia as compared to bee pollinators due to longer inter-flower flights (Herrera 1987). Some studies also emphasize the potential importance of butterflies and moth for long-distance pollination, especially if pollen remains on the insect over a long period of time (Courtney, et al 1982;Chase, et al 1996). Further studies assessing the time pollen remains available for pollination on bumblebee males' bodies over time and the inter-floral movement patterns of foraging bumblebee males during this time will be able to conclusively address the spatial scale and effectiveness of pollen dispersal through male bumblebees.…”

Section: Discussionmentioning

confidence: 99%

The pollination potential of free-foraging bumblebee (Bombus spp.) males (Hymenoptera: Apidae)

Wolf

Moritz

2014

Apidologie

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-Bumblebee workers are efficient pollinators. However, despite their flower visits and less intense grooming the role of males as pollen vectors is largely unexplored. We compared the quantity and diversity of pollen on the bodies (pollination-active pollen) of free-foraging workers and males of two bumblebee species (Bombus lapidarius and Bombus terrestris) to assess their pollination potential. In both species, males exhibit worker-like flower constancy, but differ significantly from workers in the predominantly collected pollen types. Mean pollen loads of approximately 10,000 grains/individual suggest that males can contribute to the colony pollination service. Bumblebee males add to the diversity of pollinators, associated to increased crop pollination and facilitate pollen flow in specific ways, worthwhile further investigation.bumblebee males / pollen loads / colony pollination service / flower constancy

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“…The presence of bees in the area also suggested that pollen could be carried several kilometres and be exchanged in the hive (B. Vaissiere, personal communication). Microsatellite markers helped to demonstrate that long-distance pollen-flow within populations is relatively common for wind-pollinated species (Dow and Ashley 1996;Streiff et al 1999) and insectpollinated species (Chase et al 1996;Horskins and Turner 1999;Konuma et al 2000).…”

Section: Reproductive Behaviour Inside the Seed Orchardmentioning

confidence: 99%

Gene flow estimation with microsatellites in a Malagasy seed orchard of Eucalyptus grandis

Chaix

Gerber²,

Razafimaharo³

et al. 2003

Theor Appl Genet

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Eucalyptus grandis has a mixed-mating reproductive system. Malagasy Eucalyptus seed orchards were established 15 years ago with two aims both based on panmixia: open-pollinated seed production and genetic improvement. The panmixia hypothesis has never been confirmed in the seed orchard. From a seedling seedorchard stand comprising 349 trees and using data obtained with six selected microsatellite markers, paternity analysis was performed for 724 offspring collected on 30 adult trees. Paternity assignment, based on exclusion procedures and likelihood-ratio method, was achieved with high accuracy; the exclusion probability value was 0.997. The outcrossing rate was very high (96.7%). More than 50% of potential male trees (199 out of 349) in the seed orchard contributed to pollination for 440 offspring of 30 progenies (8.6% of the basic population). The pollination rate from outside the seed orchard was high (39.2%), but might be due to the small size of this seed orchard. This study showed that "panmixia-like pollination" can be assumed.

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Distant gene flow in tropical trees

Cited by 184 publications

References 10 publications

Native bees mediate long-distance pollen dispersal in a shade coffee landscape mosaic

Native bees mediate long-distance pollen dispersal in a shade coffee landscape mosaic

The pollination potential of free-foraging bumblebee (Bombus spp.) males (Hymenoptera: Apidae)

Gene flow estimation with microsatellites in a Malagasy seed orchard of Eucalyptus grandis

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