| 研究課題/領域番号 |
21K06404
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| 研究種目 |
基盤研究(C)
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| 配分区分 | 基金 |
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| 応募区分 | 一般 |
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| 審査区分 |
小区分46020:神経形態学関連
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| 研究機関 | 北海道大学 |
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研究代表者 |
PATZKE NINA 北海道大学, 高等教育推進機構, 助教 (20801690)
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| 研究期間 (年度) |
2021-04-01 – 2022-03-31
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| 研究課題ステータス |
中途終了 (2021年度)
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| 配分額 *注記 |
4,030千円 (直接経費: 3,100千円、間接経費: 930千円)
2023年度: 1,170千円 (直接経費: 900千円、間接経費: 270千円)
2022年度: 1,690千円 (直接経費: 1,300千円、間接経費: 390千円)
2021年度: 1,170千円 (直接経費: 900千円、間接経費: 270千円)
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| キーワード | evolution / brain / comparative neuroanatomy / carnivores / pinnipeds / Brain / Pinnipeds / Evolution / Comparative neuroanatomy / Marine mammals |
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| 研究開始時の研究の概要 |
In this project we aim to determine the strength of environmental influence, specifically the aquatic environment, on the evolution of the mammalian brain by investigating the semi-aquatic carnivores, the pinnipeds (seals, sea lions and walruses).
The acquired knowledge will be valuable in assessing the potential for the influence of the environment on mammalian brains in general, as environmental factors are often cited in relation to mammalian brain evolution, but specifics, in terms of what the environment can actually influence in terms of brain morphophysiology are still unknown.
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| 研究実績の概要 |
In this project we aim to determine the strength of aquatic environment, on the evolution of the mammalian brain by investigating the semi-aquatic carnivores, the pinnipeds. We will determine whether the pinniped brain is more similar to the taxonomically related terrestrial carnivores or the environmentally related fully aquatic whales. We collected specimens of 5 spotted seals, 2 Steller sea lions, 4 bears and 2 racoons. All brains were scanned for structural analysis using a 3T MRI scanner. The data of hippocampal volume and brain volume has been processed and hippocampi of all 4 species have been subjected to immunohistochemistry. Our preliminary results demonstrate that pinnipeds have relative smaller hippocampi compared to terrestrial carnivores. Furthermore the semiaquatic pinnipeds have a reduced adult hippocampal neurogenesis. These results are in line with the findings we previously observed in whales.
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