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• W1974698117 abstract "The sand tilefish occurs in colonies composed of polygynous mating units aptly characterized as harems. Field studies were conducted to examine the extent to which male tilefish monopolize harems through defence of resources important to females, by directly restricting the locations of mates that aggregate to reduce predation risk, or both. Burrow and female removals, combined with feeding experiments and observation of foraging and prey distribution, indicated that females defend a home burrow refuge and a surrounding feeding space. Male removals revealed that females do not position territories solely to be near mates, but spawn with whichever male occupies their feeding area. Responses to female removals confirmed that intrasexual competition restricts the location and amount of space occupied by some females. Group formation suggests, however, that competition costs are not so high as to prevent female occupation of adjacent territories. Instead, joining harems may promote dependable spawning opportunities for females that are restricted to home burrows for predator avoidance. Male removals indicated that males position their territories to acquire mates. Males did not, however, prevent their mates from moving to territories of other males when adjacent spaces were made vacant experimentally. Males did not abandon their territories when all mates were removed. Also, unmated males defend territories that are as large as those of males with as many as three mates. These results support the resource defence hypothesis. Monopolization of multiple mates is only feasible, however, because tilefish aggregate for reasons probably related to predator avoidance. Therefore, aspects of harem formation in tilefish are also consistent with the female defence hypothesis. We argue that a dichotomy between resource and female defence may not apply well to tilefish or other group-living fish where females are site-restricted and egg production and spawning is iterated year-round." @default.
• W1974698117 created "2016-06-24" @default.
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• W1974698117 date "1989-11-01" @default.
• W1974698117 modified "2023-10-12" @default.
• W1974698117 title "The evolutionary significance of harem polygyny in the sand tilefish, Malacanthus plumieri: resource or female defence?" @default.
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• W1974698117 doi "https://doi.org/10.1016/s0003-3472(89)80113-7" @default.
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