A test of the adaptive specialization hypothesis: population differences in caching, memory, and the hippocampus in black-capped chickadees (Poecile atricapilla).
A test of the adaptive specialization hypothesis: population differences in caching, memory, and the hippocampus in black-capped chickadees (Poecile atricapilla).
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DOI：
10.1037/0735-7044.116.4.515
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发表时间：
2002-08
影响因子：
1.9
通讯作者：
V. Pravosudov;N. Clayton
中科院分区：
文献类型：
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作者：
V. Pravosudov;N. Clayton
为了测试准确的缓存恢复对于生活在食物供应有限和不可预测的恶劣条件下的鸟类更关键的假设，作者比较了来自阿拉斯加和科罗拉多州的黑帽山雀(Poecile Atricapilla)的食物缓存、记忆和海马体。在相同的实验室条件下，阿拉斯加山雀(A)缓存的食物明显更多；(B)缓存恢复更有效：(C)在一次性联想学习任务中执行得更准确，其中鸟类必须依赖空间记忆，但在此任务的非空间版本上测试时没有差异；(D)与科罗拉多山雀相比，阿拉斯加山雀的海马体体积明显更大，包含更多神经元。这些结果支持了这样的假设，即这些种群差异可能反映了对恶劣环境的适应。
To test the hypothesis that accurate cache recovery is more critical for birds that live in harsh conditions where the food supply is limited and unpredictable, the authors compared food caching, memory, and the hippocampus of black-capped chickadees (Poecile atricapilla) from Alaska and Colorado. Under identical laboratory conditions, Alaska chickadees (a) cached significantly more food; (b) were more efficient at cache recovery: (c) performed more accurately on one-trial associative learning tasks in which birds had to rely on spatial memory, but did not differ when tested on a nonspatial version of this task; and (d) had significantly larger hippocampal volumes containing more neurons compared with Colorado chickadees. The results support the hypothesis that these population differences may reflect adaptations to a harsh environment.