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- W3090501158 abstract "Abstract Natural selection should favour strategies that maximise reproductive success. Females may use different resources during progressive stages of reproduction according to energetic demands, behavioural constraints and prey availability. We used South American fur seal, Arctocephalus australis australis , pup whisker isotope values as proxies for maternal diet and habitat use to determine how resource use (1) changes throughout pup development from in utero growth to mid-end of lactation and (2) how it differs among individuals. The longest whisker was cut from 5 male and 5 female fur seal pups (of approximately 8 months of age) at Bird Island, Falkland Islands, in 2018, and δ 15 N values and δ 13 C values were analysed every 5 mm along the length of each whisker. Patterns in δ 13 C values indicated that mothers used different habitats during the annual cycle, likely coinciding with seasonal shifts in prey availability or distribution. The individual specialisation index based on δ 13 C values was 0.34, indicating that adult females used different habitats, which could reduce intra-specific competition and ultimately enhance pup growth and survival. An increase in δ 15 N values occurred along every pup whisker from pup birth to mid-end of lactation, which likely reflected trophic enrichment related to suckling and fasting by pups, overriding the maternal isotopic signature. Pup whisker stable isotopes are useful proxies of maternal foraging ecology. However, physiological processes complicate interpretations by altering δ 15 N values. Interpreting these values therefore requires additional knowledge of the species’ ecology and physiology." @default.
- W3090501158 created "2020-10-08" @default.
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- W3090501158 date "2020-09-29" @default.
- W3090501158 modified "2023-10-16" @default.
- W3090501158 title "Stable Isotope Values in South American Fur Seal Pup Whiskers as Proxies of Year-round Maternal Foraging Ecology" @default.
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- W3090501158 doi "https://doi.org/10.1007/s00227-020-03760-4" @default.
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