| Project/Area Number |
01540549
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
生態学
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| Research Institution | Kyushu University |
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Principal Investigator |
MURAI Minoru Kyushu Univ., Faculty of Science, Assoc. Prof。, 理学部, 助教授 (80117267)
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| Project Period (FY) |
1989 – 1990
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| Project Status |
Completed (Fiscal Year 1990)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1990: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1989: ¥1,300,000 (Direct Cost: ¥1,300,000)
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| Keywords | courtship behavior / interaction / fiddler / wandering / burrow-holding / mating refusal / 社会行動 |
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| Research Abstract |
(1) Male Uca arcuata courted by approaches from their burrows and by wandering. Difference in the rate of encounter with females between burrow-holding males and burrow-less wandering males was not significant. Burrow-holding males less often caused displacement of females for wandering than wandering males did. Burrow-holding males behaved not to reduce availability of potential mates in their neighborhood.
Burrow dwelling males were apt to initiate wandering after decreased encounters with females. Wandering of females enticed by wandering males occurred as often as wandering of males caused by other males. Most wandering males that displaced burrow owners used the burrows one or more times after displacing the owners. Wandering males experienced more interactions with other males than burrow-holding males did. Courting during wandering had the extra cost of fighting for temporal burrows, and there was not increase of the encounter rate of females during wandering.
(2) Mating exclusively occurred during holding burrows, but the rate per a fixed number of encounters with females was not different between burrow-holding males and wandering males.
(3) The behavior pattern of courtship of this species was compared with other species of fiddlers. Courtship during wandering increased in relation to the environmental condition of burrowing habitat. Highly successful underground mating abruptly decreased courting by wanderers.
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