EFFECT OF BURIAL BY SQUIRRELS ON GERMINATION AND SURVIVAL OF OAK AND HICKORY NUTS
EFFECT OF BURIAL BY SQUIRRELS ON GERMINATION AND SURVIVAL OF OAK AND HICKORY NUTS
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DOI：
10.2307/2424983
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发表时间：
1977-01-01
影响因子：
0.6
通讯作者：
BARNETT, RJ
中科院分区：
文献类型：
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作者：
BARNETT, RJ
为方差分析而设计的田间实验表明，地表捕食者显着降低了白橡橡子（Quercus alba）和核桃山核桃（Carya glabra）的存活率，而地下捕食者仅对橡子产生显着影响。对山核桃的捕食比对橡子的捕食要强烈得多。掩埋橡子可以增加被捕食者的存活率，但不会增加发芽率。山核桃的掩埋并没有显着影响存活或发芽。橡子的发芽率高于山核桃。白橡树（鳞茎亚属）中橡子的非休眠状态，通过在被捕食之前将营养物质和胚胎从橡子中转移出来，提供了逃避捕食的机会。松鼠在埋葬坚果之前将其切开的做法被认为是对非休眠状态的进化反应。
Field experiments designed for analysis of variance demonstrated that surface predators significantly reduced survival of both white oak acorns (Quercus alba) and pignut hickory nuts (Carya glabra), while fossorial predators significantly affected only the acorns. Predation on hickory nuts was much more intense than on acorns. Burial of acorns resulted in increased survival from predation, but not increased germination. Burial of hickory nuts did not significantly affect survival or germination. Germination was higher for acorns than hickory nuts. Nondormancy of acorns in the white oaks, subgenus Lepidobalanus, provides an escape from predation, by transferring nutrients and the embryo proper out of the acorn prior to predation. The practice by squirrels of notching nuts before burying them is suggested to be an evolutionary response to nondormancy.