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##See official page of publication2019-10-27
СТАТЬЯ
Pollination of two species of Ferocactus: interactions between cactus‐specialist bees and their host plants
See official publication page.Functional Ecology
20
Журнал с антэкологическими публикациями.
Wiley-Blackwell, British Ecological Society · admin@functionalecology.org, managingeditor@functionalecology.org

, . V. 19. No. 4.
P. 727734 (8).
Resolving the controversy over the prevalence of generalization in plant–pollinator interactions requires field studies characterizing the pollination effectiveness of all a plant's floral visitors. Herein, the pollination effectiveness of all visitors to two species of barrel cactus (Ferocactus) was quantified. Flowers of both species were pollinated almost exclusively by cactus-specialist bees: 99% (F. cylindraceus (Engelm.) Orcutt) and 94% (F. wislizeni (Engelm.) Britt. and Rose) of all seeds produced in this study resulted from cactus bee visits. For F. cylindraceus, the cactus-specialist Diadasia rinconis was the most abundant visitor. For F. wislizeni, three cactus-specialists (including D. rinconis) plus generalists in the family Halictidae (which did not act as pollinators) each accounted for a quarter of all visits. Diadasia rinconis visits to F. wislizeni flowers were more effective (per-visit) than visits by the other two cactus-specialists. Pollen-collecting and nectar-collecting visits were equally effective. Nectar-collecting visits were the most abundant. Apart from the non-pollinating halictids, floral visitors surprisingly did not include commonly co-occurring generalist bees. These data suggest that, just as apparently specialized flowers may be visited by a diverse assemblage of generalists, so apparently generalized flowers may be visited predominantly by specialists, and that these specialists may perform virtually all of the pollination.
Pollination of two species of Ferocactus: interactions between cactus‐specialist bees and their host plants
Functional Ecology
20
Журнал с антэкологическими публикациями.
Wiley-Blackwell, British Ecological Society · admin@functionalecology.org, managingeditor@functionalecology.org

, 2,005. V. 19. No. 4. P. 727–734 (8).
Resolving the controversy over the prevalence of generalization in plant–pollinator interactions requires field studies characterizing the pollination effectiveness of all a plant's floral visitors. Herein, the pollination effectiveness of all visitors to two species of barrel cactus (Ferocactus) was quantified. Flowers of both species were pollinated almost exclusively by cactus-specialist bees: 99% (F. cylindraceus (Engelm.) Orcutt) and 94% (F. wislizeni (Engelm.) Britt. and Rose) of all seeds produced in this study resulted from cactus bee visits. For F. cylindraceus, the cactus-specialist Diadasia rinconis was the most abundant visitor. For F. wislizeni, three cactus-specialists (including D. rinconis) plus generalists in the family Halictidae (which did not act as pollinators) each accounted for a quarter of all visits. Diadasia rinconis visits to F. wislizeni flowers were more effective (per-visit) than visits by the other two cactus-specialists. Pollen-collecting and nectar-collecting visits were equally effective. Nectar-collecting visits were the most abundant. Apart from the non-pollinating halictids, floral visitors surprisingly did not include commonly co-occurring generalist bees. These data suggest that, just as apparently specialized flowers may be visited by a diverse assemblage of generalists, so apparently generalized flowers may be visited predominantly by specialists, and that these specialists may perform virtually all of the pollination.
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