DEVELOPMENT OF HIPPOCAMPAL SPECIALIZATION IN 2 SPECIES OF TIT (PARUS SPP)
DEVELOPMENT OF HIPPOCAMPAL SPECIALIZATION IN 2 SPECIES OF TIT (PARUS SPP)
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DOI：
10.1016/0166-4328(94)90004-3
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发表时间：
1994-03-31
影响因子：
2.7
通讯作者：
KREBS, JR
中科院分区：
文献类型：
--
作者：
HEALY, SD;CLAYTON, NS;KREBS, JR
研究表明，储存食物的鸟类与不储存食物的鸟类相比，相对于端脑的其余部分具有更大的海马体。先前的一项研究报告称，这种相对海马体积的差异在雏鸟的比较中并不明显，但在鸟类羽翼丰满后就会出现。这一结论是基于对鸦科中储存和非储存物种的比较。本研究比较了另一对储存/非储存物种，以测试先前研究的结果是否可以在另一个鸟类家族中复制。测量了储存食物的沼泽山雀和非储存的蓝山雀的海马区和端脑其余部分的体积，并估计了海马区神经元的大小、密度和总数。两个物种的雏鸟的相对海马体积没有差异，而成年沼泽山雀的相对海马体积大于蓝山雀。成鸟之间的差异之所以出现，是因为在沼泽山雀中，成鸟的相对海马体积比雏鸟大得多，而蓝山雀则不然。这两个物种的雏鸟神经元密度均显着高于成年蓝山雀，并且成年蓝山雀的神经元比成年沼泽山雀更少。这项研究的结果与早期比较储存和非储存鸦科动物的研究基本一致，表明观察到的模式可能反映了储存者和非储存者在海马区发育方面的普遍差异。
Food storing birds have been shown to have a larger hippocampus, relative to the rest of the telencephalon, than do non-storers. A previous study reported that this difference in relative hippocampal volume is not apparent in a comparison of nestling birds, but emerges after birds have fledged. This conclusion was based on a comparison of a storing and a non-storing species in the corvid family. The present study compared another storer/non-storer pair of species in order to test whether the results of the previous study can be replicated in another family of birds. The volumes,of the hippocampal region and remainder of the telencephalon were measured and estimates of neuron size, density and total number in the hippocampal region were made for nestlings and adults of the food-storing marsh tit Parus palustris and non-storing blue tit Parus caeruleus. Relative hippocampal volume did not differ between nestlings of the two species, whilst the relative hippocampal volume of adult marsh tits was greater than that of blue tits. The difference between adults arose because in marsh tits but not blue tits, adults had a significantly larger relative hippocampal Volume than did nestlings. Neuron density was significantly higher in both species in nestlings than in adults and adult blue tits had fewer neurons than did adult marsh tits. The results of this study are largely consistent with the earlier study comparing a storing and non-storing species of corvid, suggesting that the observed patterns may reflect a general difference between storers and non-storers in the development of the hippocampal region.