Weak trophic links between a crab-spider and the effective pollinators of a rewardless orchid
Sit and wait predators hunting on flowers are considered to be exploiters of plant–pollinator mutualisms. Several studies have shown that plant–pollinator interactions can be highly susceptible to the impact of a third trophic level, via consumptive (direct) and non-consumptive (indirect) effects th...
| Autores principales: | , , |
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| Formato: | info:ar-repo/semantics/artículo |
| Lenguaje: | Inglés |
| Publicado: |
2017
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| Materias: | |
| Acceso en línea: | http://hdl.handle.net/20.500.12123/1277 http://www.sciencedirect.com/science/article/pii/S1146609X14001271 https://doi.org/10.1016/j.actao.2014.11.003 |
| _version_ | 1855034777458966528 |
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| author | Quintero, Carolina Corley, Juan Carlos Aizen, Marcelo Adrian |
| author_browse | Aizen, Marcelo Adrian Corley, Juan Carlos Quintero, Carolina |
| author_facet | Quintero, Carolina Corley, Juan Carlos Aizen, Marcelo Adrian |
| author_sort | Quintero, Carolina |
| collection | INTA Digital |
| description | Sit and wait predators hunting on flowers are considered to be exploiters of plant–pollinator mutualisms. Several studies have shown that plant–pollinator interactions can be highly susceptible to the impact of a third trophic level, via consumptive (direct) and non-consumptive (indirect) effects that alter pollinator behavior and, ultimately, plant fitness. However, most flowering plants attract a wide array of flower visitors, from which only a subset will be effective pollinators. Hence, a negative effect of an ambush predator on plant fitness should be expected only when: (i) the effective pollinators are part of the predators' diet and/or (ii) the non-consumptive effects of predator presence (e.g. dead prey) alter the behavior of effective pollinators and pollen movement among individual plants. We analyzed the direct and indirect effects of a crab-spider (Misumenops pallidus), on the pollination and reproductive success of Chloraea alpina, a Patagonian rewardless orchid. Our results indicate that most of the flower visitors do not behave as effective pollinators and most effective pollinators were not observed as prey for the crab-spider. In terms of non-consumptive effects, inflorescences with and without spiders and/or dead-prey did not vary the frequency of flower visitors, nor pollinia removal or deposition. Hence, it is not surprising that M. pallidus has a neutral effect on pollinia removal and deposition as well as on fruit and seed set. Similar to other rewardless orchids, the low reproductive success of C. alpina (∼6% fruit set) was associated with the limited number of visits by effective pollinators. Negative top-down effects of a flower-visitor predator on plant pollination may not be anticipated without studying the direct and indirect effects of this predator on the effective pollinators. In pollination systems where effective pollinators visited flowers erratically, such as in deceptive orchids, we expect weak or no effect of predators on plant fitness. |
| format | info:ar-repo/semantics/artículo |
| id | INTA1277 |
| institution | Instituto Nacional de Tecnología Agropecuaria (INTA -Argentina) |
| language | Inglés |
| publishDate | 2017 |
| publishDateRange | 2017 |
| publishDateSort | 2017 |
| record_format | dspace |
| spelling | INTA12772018-06-28T12:40:38Z Weak trophic links between a crab-spider and the effective pollinators of a rewardless orchid Quintero, Carolina Corley, Juan Carlos Aizen, Marcelo Adrian Orchidaceae Polinizadores Pollinators Región Patagónica Misumenops Pallidus Chloraea Alpina Araña Cangrejo Sit and wait predators hunting on flowers are considered to be exploiters of plant–pollinator mutualisms. Several studies have shown that plant–pollinator interactions can be highly susceptible to the impact of a third trophic level, via consumptive (direct) and non-consumptive (indirect) effects that alter pollinator behavior and, ultimately, plant fitness. However, most flowering plants attract a wide array of flower visitors, from which only a subset will be effective pollinators. Hence, a negative effect of an ambush predator on plant fitness should be expected only when: (i) the effective pollinators are part of the predators' diet and/or (ii) the non-consumptive effects of predator presence (e.g. dead prey) alter the behavior of effective pollinators and pollen movement among individual plants. We analyzed the direct and indirect effects of a crab-spider (Misumenops pallidus), on the pollination and reproductive success of Chloraea alpina, a Patagonian rewardless orchid. Our results indicate that most of the flower visitors do not behave as effective pollinators and most effective pollinators were not observed as prey for the crab-spider. In terms of non-consumptive effects, inflorescences with and without spiders and/or dead-prey did not vary the frequency of flower visitors, nor pollinia removal or deposition. Hence, it is not surprising that M. pallidus has a neutral effect on pollinia removal and deposition as well as on fruit and seed set. Similar to other rewardless orchids, the low reproductive success of C. alpina (∼6% fruit set) was associated with the limited number of visits by effective pollinators. Negative top-down effects of a flower-visitor predator on plant pollination may not be anticipated without studying the direct and indirect effects of this predator on the effective pollinators. In pollination systems where effective pollinators visited flowers erratically, such as in deceptive orchids, we expect weak or no effect of predators on plant fitness. Fil: Quintero, Carolina. State University Of Colorado-boulder; Estados Unidos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Patagonia Norte. Instituto de Investigación en Biodiversidad y Medioambiente; Argentina. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche. Laboratorio de Ecotono; Argentina Fil: Corley, Juan Carlos. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche. Grupo de Ecología de Poblaciones de Insectos; Argentina Fil: Aizen, Marcelo Adrian. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Patagonia Norte. Instituto de Investigación en Biodiversidad y Medioambiente; Argentina 2017-09-20T18:48:22Z 2017-09-20T18:48:22Z 2015-01 info:ar-repo/semantics/artículo info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://hdl.handle.net/20.500.12123/1277 http://www.sciencedirect.com/science/article/pii/S1146609X14001271 1146-609X https://doi.org/10.1016/j.actao.2014.11.003 eng info:eu-repo/semantics/restrictedAccess application/pdf Patagonia (general region) Acta oecologica 62 : 32-39. (January 2015) |
| spellingShingle | Orchidaceae Polinizadores Pollinators Región Patagónica Misumenops Pallidus Chloraea Alpina Araña Cangrejo Quintero, Carolina Corley, Juan Carlos Aizen, Marcelo Adrian Weak trophic links between a crab-spider and the effective pollinators of a rewardless orchid |
| title | Weak trophic links between a crab-spider and the effective pollinators of a rewardless orchid |
| title_full | Weak trophic links between a crab-spider and the effective pollinators of a rewardless orchid |
| title_fullStr | Weak trophic links between a crab-spider and the effective pollinators of a rewardless orchid |
| title_full_unstemmed | Weak trophic links between a crab-spider and the effective pollinators of a rewardless orchid |
| title_short | Weak trophic links between a crab-spider and the effective pollinators of a rewardless orchid |
| title_sort | weak trophic links between a crab spider and the effective pollinators of a rewardless orchid |
| topic | Orchidaceae Polinizadores Pollinators Región Patagónica Misumenops Pallidus Chloraea Alpina Araña Cangrejo |
| url | http://hdl.handle.net/20.500.12123/1277 http://www.sciencedirect.com/science/article/pii/S1146609X14001271 https://doi.org/10.1016/j.actao.2014.11.003 |
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