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• W2913547752 abstract "In a food-limited system, parents may have to allocate resources in ways that do not benefit all their offspring equally. We investigated food allocation and parent and chick behaviours in Magellanic penguins at their colony in Punta Tombo, Argentina, by observing feedings in one- and two-chick broods after the chicks were more than 20 days of age. Feeds lasted 21 min on average, and the length of a feed was not correlated either with the number of chicks in a brood, or with the amount of food the parents gave. Parents with two-chick broods distributed food evenly to both chicks. Although single chicks were fed more than chicks with siblings, as a proportion of a chick's start weight, both single chicks and lighter chicks in two-chick broods received significantly more food than heavier chicks. Chicks continued begging after the last feed in nearly half of the two-chick broods, suggesting they were not sated and so are food-limited. In linear mixed-effects models that considered, respectively, the absolute amount of food a chick received and the amount of food it received as a proportion of its start weight, chick begging was the most significant predictor of how much it was fed. Jostling behaviours between the chicks did not correlate with the amount of food either one received. Parental nonfeeding behaviours in two-chick broods (e.g. bending towards a chick and opening the bill but not regurgitating food) were more frequently directed at the lighter chick, but did not correlate with the amount of food a chick received. These results suggest (1) parents are motived to feed their chicks quickly, (2) parents try to allocate food equally to chicks of this age and (3) chicks devote most of their energy trying to get fed by the parent, rather than competing antagonistically with one another." @default.
• W2913547752 created "2019-02-21" @default.
• W2913547752 creator A5006525769 @default.
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• W2913547752 date "2019-02-01" @default.
• W2913547752 modified "2023-09-26" @default.
• W2913547752 title "Food allocation and feeding behaviours of Magellanic penguin, Spheniscus magellanicus, adults and chicks" @default.
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• W2913547752 doi "https://doi.org/10.1016/j.anbehav.2018.12.008" @default.
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