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首页> 外文期刊>The Wilson Bulletin >SEED-SIZE SELECTION IN MOURNING DOVES AND EURASIAN COLLARED-DOVES
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SEED-SIZE SELECTION IN MOURNING DOVES AND EURASIAN COLLARED-DOVES

机译：哀鸽和EURASIAN斑鸠的种子尺寸选择

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摘要

I studied seed-size selection among Mourning Doves (Zenaida macroura) and Eurasian Collared-Doves (Streptopelia decaocto), two newly sympatric species for which mechanisms of seed selection are not well understood. I measured and compared mean length, breadth, and thickness of seeds available to, and consumed by, these species in feeding trials of penned birds. Both species selected corn (Zea mays) seeds that were shorter and narrower than average, but Eurasian Collared-Doves selected corn that was thicker than average and sunflower (Helianthus annuus) seeds that were broader and thicker than average. Mourning Doves consumed corn of average thickness, and wheat (Triticum aestivum) and sunflower seeds of average size with respect to all dimensions. Corn consumption by both species seems limited by seed length and breadth, but Mourning Dove consumption of smaller seed types (wheat and milo [Sorghum vulgare]) appears largely unaffected by seed size. Among larger seed types (corn and sunflower), Eurasian Collared-Doves may select thicker- and/or broader-than-average seeds to maximize foraging efficiency. Sunflower and corn seeds consumed did not vary between species with respect to any dimension, but Eurasian Collared-Doves seemed willing to select, and able to eat, broader and thicker seeds than Mourning Doves, which may limit foraging competition between these species.
机译：我研究了哀鸽（Zenaida macroura）和欧亚领斑鸠（Streptopelia decaocto）之间的种子大小选择，这两个新同胞物种的种子选择机制尚不十分清楚。我测量并比较了在饲喂鸟类饲养试验中这些物种可获得的和被这些物种消耗的种子的平均长度，宽度和厚度。两种物种都选择了比平均水平短而窄的玉米（Zea mays）种子，但是欧亚领鸽子选择了比平均水平厚的玉米种子和比平均水平更宽，更厚的向日葵（向日葵）种子。哀悼的鸽子消耗了平均厚度的玉米，小麦（Triticum aestivum）和葵花籽。两种物种的玉米消费量似乎都受到种子长度和宽度的限制，但是较小种子类型（小麦和mi（高粱））的哀悼鸽子消费量似乎不受种子大小的影响。在较大的种子类型（玉米和向日葵）中，欧亚领斑鸠可能会选择比平均厚和/或宽的种子，以最大程度地提高觅食效率。向日葵和玉米种子的消费在物种之间在任何维度上都没有变化，但是欧亚领鸽子似乎愿意选择并且能够食用比哀鸽更宽，更厚的种子，这可能限制了这些物种之间的觅食竞争。

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