0000680270

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СТАТЬЯ
Effects of grazing disturbance on the reproduction of a perennial herb, Cypellaherbertii (Lindl.) Herb. (Iridaceae)
Plant Systematics and Evolution, . V. 243. No. 3. P. 165173 (9).
A recent study in a natural grassland in Argentina revealed that grazing strongly reduced the available pollinators for a population of Cypella herbertii. Comparing grazed and fenced areas (exclosures) we tested the hypothesis that self-incompatibility would be selected against in a pollinator-poor environment leading to changes in breeding system. No differences in breeding system were found between populations from inside and outside exclosures. However, we detected: (i) C. herbertii clearly exhibits a mixed-mating system but has a remarkably low spontaneous fruit formation; (ii) this species though highly self-compatible expresses a significant decay at seed set stage when self-pollinated. We conclude that grazing impact on pollinators together with C. herbertii’s high dependence on pollinators should be considered when assessing the risk of extinction of this species.
Effects of grazing disturbance on the reproduction of a perennial herb, Cypellaherbertii (Lindl.) Herb. (Iridaceae)
Devoto M., Medan D.
Plant Systematics and Evolution, 2004. V. 243. No. 3. P. 165–173 (9).
A recent study in a natural grassland in Argentina revealed that grazing strongly reduced the available pollinators for a population of Cypella herbertii. Comparing grazed and fenced areas (exclosures) we tested the hypothesis that self-incompatibility would be selected against in a pollinator-poor environment leading to changes in breeding system. No differences in breeding system were found between populations from inside and outside exclosures. However, we detected: (i) C. herbertii clearly exhibits a mixed-mating system but has a remarkably low spontaneous fruit formation; (ii) this species though highly self-compatible expresses a significant decay at seed set stage when self-pollinated. We conclude that grazing impact on pollinators together with C. herbertii’s high dependence on pollinators should be considered when assessing the risk of extinction of this species.
AID: 0000680270
DOI: 10.1007/s00606-003-0084-0