Ladage Lara D, Roth Timothy C, Fox Rebecca A, Pravosudov Vladimir V
Biology Department, University of Nevada, Reno, NV 89557, USA.
Behav Neurosci. 2009 Apr;123(2):284-91. doi: 10.1037/a0014817.
The complexity of an animal's physical environment is known to affect the hippocampus. Captivity may affect hippocampal anatomy and this may be attributable to the limited opportunities for memory-based experiences. This has tangential support, in that differential demands on memory can mediate changes in the hippocampus. What remains unclear is whether captivity directly affects hippocampal architecture and whether providing memory-based experiences in captivity can maintain hippocampal attributes comparable to wild-caught conspecifics. Using food-caching mountain chickadees (Poecile gambeli), we found that wild-caught individuals had larger hippocampal volumes relative to the rest of the telencephalon than captive birds with or without memory-based food-caching experiences, whereas there were no differences in neuron numbers or telencephalon volume. Also, there were no significant differences in relative hippocampal volume or neuron numbers between the captive birds with or without memory-based experiences. Our results demonstrate that captivity reduces hippocampal volume relative to the remainder of the telencephalon, but not at the expense of neuron numbers. Further, memory-based experiences in captivity may not be sufficient to maintain hippocampal volume comparable to wild-caught counterparts.
已知动物物理环境的复杂性会影响海马体。圈养可能会影响海马体的解剖结构，这可能归因于基于记忆的体验机会有限。这有间接的支持依据，即对记忆的不同需求可以介导海马体的变化。尚不清楚的是，圈养是否直接影响海马体结构，以及在圈养环境中提供基于记忆的体验是否能使海马体特征维持在与野生捕获的同种动物相当的水平。通过对贮藏食物的北美黑顶山雀（Poecile gambeli）的研究，我们发现，相对于端脑的其他部分，野生捕获的个体比有或没有基于记忆的食物贮藏体验的圈养鸟类具有更大的海马体体积，而神经元数量或端脑体积没有差异。此外，有或没有基于记忆体验的圈养鸟类之间，相对海马体体积或神经元数量也没有显著差异。我们的结果表明，圈养会使相对于端脑其余部分的海马体体积减小，但不会以神经元数量为代价。此外，圈养环境中基于记忆的体验可能不足以使海马体体积维持在与野生捕获的同类相当的水平。
