REPRODUCTIVE STRATEGIES IN 2 ARCTIC PEDICULARIS SPECIES (SCROPHULARIACEAE)
REPRODUCTIVE STRATEGIES IN 2 ARCTIC PEDICULARIS SPECIES (SCROPHULARIACEAE)
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DOI：
10.1111/j.1600-0587.1993.tb00067.x
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发表时间：
1993-04-01
期刊：
影响因子：
5.9
通讯作者：
SVENSSON, M
中科院分区：
文献类型：
--
作者：
ERIKSEN, B;MOLAU, U;SVENSSON, M
对瑞典拉普兰北方马先蒿属的两个同域种--亚北极高山马先蒿（P. lapponica）和北极毛马先蒿（P. hirsuta）--的一些繁殖性状的研究表明，这两个物种的生活史策略有很大的不同。高坐果率和低种子败育率，如P. hirsuta，在解冻后期栖息地的北极植物中很常见，代表了极端逆境选择的情况，而不是杂草生活史策略的指示。另一方面，马先蒿是一个典型的K策略（或压力耐受），需要较长的生长期，以达到最佳繁殖。无论是在低海拔还是高海拔地区，高原马蹄莲的自交亲和性都随着海拔的升高而增强，这可能是对北极环境中传粉者访问频率较低的适应。山杏花柱突出部分长度的变化与光照有关。在低海拔地区，传播前的种子捕食是严重的，在那里的胶囊被苍蝇和蛾幼虫攻击。在高海拔地区，一小部分P. lapponica的胶囊只被苍蝇捕食，而P. hirsuta则完全不被捕食。
A study of a number of reproductive traits in two sympatric species of Pedicularis in northern Swedish Lapland, the subarctic-alpine P. lapponica and the artic P. hirsuta, revealed that the life-history strategies of the two species differ profoundly. High fruit set and low seed abortion rate, as in P. hirsuta, is common in arctic plants in late-thawing habitats and represents a case of extreme adversity selection rather than an indication of a ruderal life-history strategy. Pedicularis lapponica, on the other hand, is a typical K-strategist (or stress-tolerator) requiring a longer period of growth for optimal reproduction. Occurring at both low and high altitudes in the area, P. lapponica tends to increase in self-compatibility with altitude, which is interpreted as an adaptation to lower pollinator visitation frequency in arctic environments. The variation in length of the protruding part of the style in P. lapponica is shown to be correlated with exposure to light. Predispersal seed predation is severe in P. lapponica at low altitudes, where the capsules are attacked by fly and moth larvae. At high altitudes, a minor proportion of the capsules of P. lapponica experience predation and only from flies, while P. hirsuta is completely unpredated.