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Pollinator shift and reproductive performance of the qinghai-tibetan plateau endemic and endangered Swertia przewalskii (Gentianaceae)
Duan, Yuan-Wen; Liu, Jian-Quan
2007-06-01
发表期刊BIODIVERSITY AND CONSERVATION
卷号16期号:6页码:1839-1850
文章类型Article
摘要Reproductive failure results in many plant species becoming endangered. However, little is known of how and to what extent pollinator shifts affect reproductive performance of endangered species as a result of the artificial introduction of alien insects. In this study we examined breeding systems, visitor species, visiting frequency and seed set coefficients of Swertia przewalskii in two years that had different dominant pollinator species (native vs. alien). Flowers of this species were protandrous and herkogamous and insects were needed for the production of seeds. The stigmatic receptivity of this species was shorter than for other gentians. No significant difference in seed set coefficient was found for hand-pollinated plants between the two years, indicating that pollinator shift only had a minor effect on this plant's breeding system. The commonest pollinators in 2002 were native bumblebees, alien honeybees and occasional solitary bees, however, only alien honeybees were observed in 2004. The flower visitation rate in both years was relatively high, although the total visit frequency decreased significantly in 2004. The control flowers without any treatment produced significantly fewer seed sets in 2004 than in 2002. In the past decade the seed production of this species may have partly decreased due to pollination by alien honeybees, however, we suggest that they might have acted as alternative pollinators ensuring seed production of S. przewalskii when native pollinators were unavailable. The main reason that this plant is endangered is probably the result of habitat destruction, but changes in land use, namely intensified agricultural practice and unfavorable animal husbandry have also contributed to its decline. We recommend that in-situ conservation, including the establishment of a protected area, is the best way to preserve this species effectively.; Reproductive failure results in many plant species becoming endangered. However, little is known of how and to what extent pollinator shifts affect reproductive performance of endangered species as a result of the artificial introduction of alien insects. In this study we examined breeding systems, visitor species, visiting frequency and seed set coefficients of Swertia przewalskii in two years that had different dominant pollinator species (native vs. alien). Flowers of this species were protandrous and herkogamous and insects were needed for the production of seeds. The stigmatic receptivity of this species was shorter than for other gentians. No significant difference in seed set coefficient was found for hand-pollinated plants between the two years, indicating that pollinator shift only had a minor effect on this plant's breeding system. The commonest pollinators in 2002 were native bumblebees, alien honeybees and occasional solitary bees, however, only alien honeybees were observed in 2004. The flower visitation rate in both years was relatively high, although the total visit frequency decreased significantly in 2004. The control flowers without any treatment produced significantly fewer seed sets in 2004 than in 2002. In the past decade the seed production of this species may have partly decreased due to pollination by alien honeybees, however, we suggest that they might have acted as alternative pollinators ensuring seed production of S. przewalskii when native pollinators were unavailable. The main reason that this plant is endangered is probably the result of habitat destruction, but changes in land use, namely intensified agricultural practice and unfavorable animal husbandry have also contributed to its decline. We recommend that in-situ conservation, including the establishment of a protected area, is the best way to preserve this species effectively.
关键词Swertia Przewalskii Endangered Species Alien Pollinators Pollination Reproduction Qinghai-tibetan Plateau
WOS标题词Science & Technology ; Life Sciences & Biomedicine
学科领域生物科学
关键词[WOS]LOW SEED-SET ; POLLEN LIMITATION ; GENETIC-VARIATION ; L. GENTIANACEAE ; POPULATION-SIZE ; HONEY-BEE ; SUCCESS ; ECOLOGY ; BIOLOGY ; INTERFERENCE
收录类别SCI
语种英语
WOS研究方向Biodiversity & Conservation ; Environmental Sciences & Ecology
WOS类目Biodiversity Conservation ; Ecology ; Environmental Sciences
WOS记录号WOS:000247152800017
引用统计
被引频次:9[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://210.75.249.4/handle/363003/1268
专题中国科学院西北高原生物研究所
作者单位1.Chinese Acad Sci, NW Inst Plateau Biol, Key Lab Qinghai Tibetan Plateau Ecol Adaptat, Xining 810001, Peoples R China
2.Lanzhou Univ, Key Lab Arid & Grassland Ecol, Lanzhou 730000, Peoples R China
3.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
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Duan, Yuan-Wen,Liu, Jian-Quan. Pollinator shift and reproductive performance of the qinghai-tibetan plateau endemic and endangered Swertia przewalskii (Gentianaceae)[J]. BIODIVERSITY AND CONSERVATION,2007,16(6):1839-1850.
APA Duan, Yuan-Wen,&Liu, Jian-Quan.(2007).Pollinator shift and reproductive performance of the qinghai-tibetan plateau endemic and endangered Swertia przewalskii (Gentianaceae).BIODIVERSITY AND CONSERVATION,16(6),1839-1850.
MLA Duan, Yuan-Wen,et al."Pollinator shift and reproductive performance of the qinghai-tibetan plateau endemic and endangered Swertia przewalskii (Gentianaceae)".BIODIVERSITY AND CONSERVATION 16.6(2007):1839-1850.
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