| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2013: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Outline of Final Research Achievements |
This study investigated the hypothesis that the function of altruistic behaviour in mate choice of long-term monogamous species. Crows, life-long monogamy, are an ideal model to test this hypothesis. This study employed the observation and the experiment methods for two captive groups of crows. We first analyzed the inter-individual social interactions and found that affiliative interactions with alrtuisitc allopreening increased after the dominance hierarchy stabilized via aggressive interactions in the groups. Second, we found that the sex-different correlations between dominance ranks and basal stress level estimated by fecal corticosterone metabolites. Third, we found that the presence of females slightly enhance male-male allopreening, suggesting allopreening may play a role of mate choice signal for females. Finally, we found that males allofed higher quality food and allopreened more to the partner females, suggesting altruistic efforts may bias to males.
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