Scatterhoarding of Manchurian walnut Juglans mandshurica by small mammals: response to seed familiarity and seed size
Scatterhoarding of Manchurian walnut Juglans mandshurica by small mammals: response to seed familiarity and seed size
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DOI：
10.1007/s13364-010-0012-y
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发表时间：
2011-04
影响因子：
--
通讯作者：
X. Yi;Yue-qin Yang
中科院分区：
文献类型：
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作者：
X. Yi;Yue-qin Yang
种子熟悉度和种子性状（包括大小、质量和营养价值）可能影响种子的传播模式，但这些因素尚未在种子传播过程中得到深入研究。本研究的目的是研究中国东北温带森林两种不同生境中小啮齿动物对满洲核桃种子大小和熟悉程度的反应。结果表明，半岛apodemus半岛apodemus是东北核桃种子最重要的传播者。没有经验的小鼠类不排斥东北核桃的种子，与有经验的啮齿动物相比，它们的种子去除率相似。经验鼠和naïve鼠均积极参与东北核桃种子散藏。连续调查表明，大粒/质量的种子比小粒/质量的种子被清除的速度快，表明对大粒/质量的偏爱。然而，小鼠类分散储存的小种子比大种子运输距离远，无法支持传统的树种优化模型。在啮齿动物为主的小型森林中，小种子比大种子恢复的可能性更小，但贮藏区存活率更高，表明小种子比大种子更有利于更新。
Dispersal patterns can be affected by seed familiarity and seed traits, including size, mass, and nutritional value, but these factors have not been intensively studied in the context of seed dispersal processes. Our aim was to study how small rodents respond to seed size and seed familiarity in their pattern of Manchurian walnut (Juglans mandshurica) seeds in two different habitats in temperate forests of northeast China. Our results demonstrated thatApodemus penisulaeacts as the most important disperser for Manchurian walnut seeds. Inexperienced small rodents did not reject seeds of the Manchurian walnut and show similar seed removal rates as compared with experienced rodents. Both experienced and naïve rodents actively participated in seed scatterhoarding of Manchurian walnut seeds. Consecutive survey showed that seeds with large size/mass were removed faster than those with small size/mass, indicating a preference for large seeds. However, small seeds scatter-hoarded by small rodents were transported farther than large ones, failing to support the traditional optimization models for various tree species. Small seeds of Manchurian walnut in caches were less likely to be recovered than large ones and showed greater cache survival rates, indicating that small seeds would be more advantageous for regeneration than large seeds in small rodent-dominated forests.