1994～1998年秋在小兴安岭凉水自然保护区对星鸦（Nucifraga caryocatact）的贮食行为及其对红松（Pinus koraiensis）种子的传播作用进行了研究。星鸦在秋季至翌年早春主要以红松种子为食，偶食桨果。秋季种子成熟时，星鸦在取食的同时储藏大量种子作为冬季和早春的食物，这些种子中未被完全吃掉的遗留部分在第三年春天即可发芽。在树上取食部分种子后，星鸦通常储存30～50粒于舌下囊中，飞行2～5km后，将种子埋藏在土层下2.5～3.5cm深处，每个贮点多为2～4粒。贮点生境主要有8种：林缘（路边）、保护区周围空阔地、人工落叶松林、人工臭冷杉林、人工红松林、人工红皮云杉林、天然更新的杨桦林和天然原始红松阔叶林（母树林）。星鸦每天至少手动种子10次。达400粒。一个贮藏季节一只星鸦可贮藏至少16000粒种子。对红松1年生和2年生幼苗调查表明，幼苗在上述8种生境中均有分布，并且在人工落叶松林、天然更新杨桦林和母树林下有幼树分布。因此星鸦能有效地扩散红松种子，有利于红松的天然更新。

Mymecodchory (seed dispersal by ant) is a kind of mutualism between ants and plants. Ants carry the seed to their nest, and eat the elaiosome attached to the seed. While the seed is abandoned in nest or reluse Plies where may be better for the germination and seedling establishment. Ant dispersal has five characteristics: short dispersal distance, quick disappear ance of seed, directed dispersal, secondary dispersal, and low level mutualism. Ant dispersal may be benefit to the plants in following aspects: reducing competition, protecting from fires, avoiding predation, and enhancing germination and seeding extablishment. Most ant-dispersed plants are perennial herbs, about 2800 species belonging to 80 families, while ants belong to 32 genus from Formicidae. Myrmecochory appears in weveral types of habitats all over the world.