Differences of dispersal fitness of large and small acorns of Liaodong oak (Quercus liaotungensis) before and after seed caching by small rodents in a warm temperate forest, China
Differences of dispersal fitness of large and small acorns of Liaodong oak (Quercus liaotungensis) before and after seed caching by small rodents in a warm temperate forest, China
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DOI：
10.1016/j.foreco.2007.10.028
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发表时间：
2008-03
影响因子：
3.7
通讯作者：
Hongmao Zhang;Yu Chen;Zhibin Zhang
中科院分区：
文献类型：
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作者：
Hongmao Zhang;Yu Chen;Zhibin Zhang
虽然种子大小对种子命运的影响已被广泛研究，但在小型啮齿动物贮藏种子前后，大、小橡子的扩散适合度差异在很大程度上是未知的。在这项研究中，通过跟踪2400个锡标记的橡子的种子命运，辽东栎（3.2±0.6g大橡子1200粒，0.9±0.2g小橡子1200粒）（Quercus liaotungensis）在3种生境中的种子扩散，比较了大小橡子在4个扩散阶段的种子消耗、搬运、缓存和存活的差异（在种子站，在移除之后，在缓存和幼苗补充之后）在中国北京西北部的东灵山的暖温带森林中。这项研究在2005年10月至2006年5月期间进行。结果表明：（1）在种子发放点，大橡子比小橡子有更高的被移走比例和更快的移走速度，且被啮齿动物消耗的比例更低;（2）移走后，大橡子比小橡子分散时间更长，种子缓存比例更高。（3）种子贮藏后30 d内，大橡子的存活率显著低于小橡子，到次年春天，大橡子和小橡子的种子最终存活率都很小，差异不显著;（4）大橡子种子贮藏前的扩散适合度高于小橡子，贮藏后的扩散适合度低于小橡子，大橡子和小橡子的总扩散适合度没有差异。总的来说，我们的研究结果表明，大橡子Q。总扩散适合度与小种群相似。
Though effect of seed size on seed fates has been widely studied, differences of dispersal fitness of large and small acorns before and after seed caching by small rodents is largely unknown. In this study, by tracking the seed fates of 2400 tin-tagged acorns (1200 large acorns with 3.2±0.6g weight, and 1200 small acorns with 0.9±0.2g weight) of Liaodong oak (Quercus liaotungensis) in three habitats, we compared the differences of seed consumption, removal, caching and survival between large and small acorns at four dispersal stages (at seed station, after removal, after caching and seedling recruitment) in a warm temperate forest in the Dongling Mountains, northwestern Beijing, China. This study was carried out during the period of October 2005 to May 2006. The results demonstrated that, (1) at seed stations where tagged seeds were released, large acorns had higher proportion of removal (and more quickly) and lower proportion of seed consumption by rodents than small ones; (2) after removal, large acorns were dispersed longer, and had higher proportion of seed caching than small acorns. But there was no difference in the proportions of seed consumption between large and small acorns; (3) after seed caching, large acorns had significantly lower proportions of survival than small acorns within the observed 30-days period, and the final survival proportions of initially released seeds by the next spring were very small for both large and small acorns and the difference was not significant; (4) large acorns had higher dispersal fitness before seed caching but lower dispersal fitness after seed caching than small acorns; there was no difference in total dispersal fitness between large and small acorns. In general, our findings suggest that large acorns of Q. liaotungensis have similar total dispersal fitness to small ones.