Observations on the effect of nectar-robbery on the reproductive succes of Aeranthes arachnitis (Orchidaceae)
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| Natura: | Artículo científico |
| Lingua: | en |
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Universidad de Costa Rica
2007
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| _version_ | 1876454468828004352 |
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| author | David L. Roberts |
| author_facet | David L. Roberts |
| contents | Observations on the effect of nectar-robbery on the reproductive succes of Aeranthes arachnitis (Orchidaceae) David L. Roberts Biología ants repro nectar robbery Orchidaceae of orchid species have evolved mechanisms of deceit whereby the pollinator receives no reward.Lack of reward has been shown to have a significant negative effect on reproductive success in theOrchidaceae, however the phenomenon of nectar-robbery has been poorly studied. Here we investigate theeffect of nectar-robbery induced deceit by invasive ants in the nectariferous orchid Aeranthes arachnitis.Fruiting success was found to be below 5% at three sites, including two conservation areas, compared with48.5% at a site next to plantations. All the populations showed loss of floral nectar, ranging from 64.3% to100% of flowers observed. Loss of nectar to robbers that do not facilitate pollination not only represents acost to fruiting success but also a loss of a resource to the orchid through reabsorption of any excess. UsingBell’s Theory of nectar concealment it is possible to determine the critical point, below which nectar-rob-bery negatively affects fruiting success. Based on related angraecoid orchids the proportion of nectar bear-ing flowers would, theoretically, need to be 70%. The higher levels of reproductive success surrounded byplantations may due to the presence of the non-native Callistemon citrinusacting as nectar source, thusmaintaining an increased local abundance of the pollinator. This has important implications for the conser-vation and management of Aeranthes arachnitisand other species, which rely on nectariferous pollinators,particularly when a nectar bearing species becomes essentially deceptive. The result suggests that manage-ment of this nectar-robbery induced deceptive species should involve the manipulation of rewarding specieswithin the surrounding area 2007 artículo científico 1409-3871 https://www.redalyc.org/articulo.oa?id=44339814007 en http://www.redalyc.org/revista.oa?id=443 Lankesteriana International Journal on Orchidology application/pdf Universidad de Costa Rica Lankesteriana International Journal on Orchidology (Costa Rica) Num.3 Vol.7 |
| format | Artículo científico |
| id | redalyc_44339814007 |
| institution | Redalyc |
| language | en |
| publishDate | 2007 |
| publisher | Universidad de Costa Rica |
| spellingShingle | Observations on the effect of nectar-robbery on the reproductive succes of Aeranthes arachnitis (Orchidaceae) David L. Roberts Biología ants repro nectar robbery Orchidaceae Observations on the effect of nectar-robbery on the reproductive succes of Aeranthes arachnitis (Orchidaceae) David L. Roberts Biología ants repro nectar robbery Orchidaceae of orchid species have evolved mechanisms of deceit whereby the pollinator receives no reward.Lack of reward has been shown to have a significant negative effect on reproductive success in theOrchidaceae, however the phenomenon of nectar-robbery has been poorly studied. Here we investigate theeffect of nectar-robbery induced deceit by invasive ants in the nectariferous orchid Aeranthes arachnitis.Fruiting success was found to be below 5% at three sites, including two conservation areas, compared with48.5% at a site next to plantations. All the populations showed loss of floral nectar, ranging from 64.3% to100% of flowers observed. Loss of nectar to robbers that do not facilitate pollination not only represents acost to fruiting success but also a loss of a resource to the orchid through reabsorption of any excess. UsingBell’s Theory of nectar concealment it is possible to determine the critical point, below which nectar-rob-bery negatively affects fruiting success. Based on related angraecoid orchids the proportion of nectar bear-ing flowers would, theoretically, need to be 70%. The higher levels of reproductive success surrounded byplantations may due to the presence of the non-native Callistemon citrinusacting as nectar source, thusmaintaining an increased local abundance of the pollinator. This has important implications for the conser-vation and management of Aeranthes arachnitisand other species, which rely on nectariferous pollinators,particularly when a nectar bearing species becomes essentially deceptive. The result suggests that manage-ment of this nectar-robbery induced deceptive species should involve the manipulation of rewarding specieswithin the surrounding area 2007 artículo científico 1409-3871 https://www.redalyc.org/articulo.oa?id=44339814007 en http://www.redalyc.org/revista.oa?id=443 Lankesteriana International Journal on Orchidology application/pdf Universidad de Costa Rica Lankesteriana International Journal on Orchidology (Costa Rica) Num.3 Vol.7 |
| title | Observations on the effect of nectar-robbery on the reproductive succes of Aeranthes arachnitis (Orchidaceae) |
| topic | Biología ants repro nectar robbery Orchidaceae |
| url | https://www.redalyc.org/articulo.oa?id=44339814007 |