Pollination biology of fruit-bearing hedgerow plants and the role of flower-visiting insects in fruit-set
Pollination biology of fruit-bearing hedgerow plants and the role of flower-visiting insects in fruit-set
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DOI：
10.1093/aob/mcp236
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发表时间：
2009-12-01
期刊：
影响因子：
4.2
通讯作者：
Osborne, Juliet L.
中科院分区：
文献类型：
--
作者：
Jacobs, Jennifer H.;Clark, Suzanne J.;Osborne, Juliet L.
在英国，结果树篱植物的花朵在一年中的大部分时间里为赏花昆虫提供一系列的花粉和花蜜。树篱植物的果实是农田上食果鸟类的冬季食物来源。目前还不清楚最近授粉媒介数量的下降是否可能威胁到果实，从而威胁到鸟类的食物供应。本研究调查了五种常见树篱植物的授粉生物学：黑刺李（Prunus spinosa）、山楂（Crataegus monogyna）、犬蔷薇（Rosa canina）、荆棘（Rubus fruticosus）和常春藤（Hedera helix）。 开放授粉的花朵。然后对那些需要昆虫授粉的植物进行测试，以比较两种额外授粉服务情景下的坐果情况：(1) 减少授粉，在花期的部分时间将昆虫从花中排除，以及 (2) 补充授粉，将花手工异花授粉以测试花粉限制。 网袋，而荆棘和犬蔷薇的坐果未受影响。限制花朵与传粉媒介的接触对坐果没有显着影响。然而，黑刺李和山楂被发现花粉有限，这表明研究区域的授粉服务不足。确保昆虫授粉者的数量充足对于保证英国树篱鸟类的冬季果实供应可能至关重要。
In the UK, the flowers of fruit-bearing hedgerow plants provide a succession of pollen and nectar for flower-visiting insects for much of the year. The fruits of hedgerow plants are a source of winter food for frugivorous birds on farmland. It is unclear whether recent declines in pollinator populations are likely to threaten fruit-set and hence food supply for birds. The present study investigates the pollination biology of five common hedgerow plants: blackthorn (Prunus spinosa), hawthorn (Crataegus monogyna), dog rose (Rosa canina), bramble (Rubus fruticosus) and ivy (Hedera helix).The requirement for insect pollination was investigated initially by excluding insects from flowers by using mesh bags and comparing immature and mature fruit-set with those of open-pollinated flowers. Those plants that showed a requirement for insect pollination were then tested to compare fruit-set under two additional pollination service scenarios: (1) reduced pollination, with insects excluded from flowers bagged for part of the flowering period, and (2) supplemental pollination, with flowers hand cross-pollinated to test for pollen limitation.The proportions of flowers setting fruit in blackthorn, hawthorn and ivy were significantly reduced when insects were excluded from flowers by using mesh bags, whereas fruit-set in bramble and dog rose were unaffected. Restricting the exposure of flowers to pollinators had no significant effect on fruit-set. However, blackthorn and hawthorn were found to be pollen-limited, suggesting that the pollination service was inadequate in the study area.Ensuring strong populations of insect pollinators may be essential to guarantee a winter fruit supply for birds in UK hedgerows.