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• W4301394029 abstract "Reef fish may switch feeding strategies due to fluctuations in resource availability or through ontogeny. A number of studies have explored these trophodynamics using carbon (δ 13 C) and nitrogen (δ 15 N) stable isotopes, but additional tracers such as sulfur isotopes (δ 34 S) show strong potential in systems, where δ 13 C and δ 15 N results are ambiguous. We tested the utility of adding δ 34 S to conventional δ 13 C and δ 15 N analysis to detect seasonal and body size changes in resource use of two planktivorous damselfish, Dascyllus reticulatus and Dascyllus trimaculatus across the Puerto Galera embayment in the Philippines. We analyzed stable isotope ratios (δ 13 C, δ 15 N, and δ 34 S) in multiple fish tissues (liver, eye, and muscle) to represent different dietary time frames. We then compared fish tissue isotopes against particulate organic matter (POM) (δ 13 C and δ 15 N) and POM suspension feeder (the tunicate Polycarpa aurata : δ 13 C, δ 15 N, and δ 34 S) across the same sites. There were size-based and seasonal differences in damselfish resource use, the latter of which was most pronounced in the fast-turnover liver. Small fish (&lt;70 mm) demonstrated significant seasonality, appearing to switch their resource use between the rainy season and the dry season, while there was no seasonal variation in larger fish (&gt;70 mm). This suggests that smaller fish across the embayment employ an opportunistic feeding strategy to take advantage of fluctuating resource availability, while larger fish exhibits more consistent resource use. Isotope ratios of tunicates and POM further confirmed strong seasonality in this system and a lack of a spatial isotopic gradient. δ 15 N did not seem to contribute to consumer resource use patterns, while by contrast, δ 34 S fluctuated significantly between sampling periods and was crucial for demonstrating seasonality in resource use. We recommend including δ 34 S when attempting to disentangle seasonal differences in resource use in aquatic food webs using stable isotopes." @default.
• W4301394029 created "2022-10-05" @default.
• W4301394029 creator A5018633304 @default.
• W4301394029 creator A5065075451 @default.
• W4301394029 creator A5068251435 @default.
• W4301394029 creator A5076689553 @default.
• W4301394029 creator A5078898112 @default.
• W4301394029 date "2022-10-05" @default.
• W4301394029 modified "2023-10-01" @default.
• W4301394029 title "Stable isotopes elucidate body-size and seasonal fluctuations in the feeding strategies of planktivorous fishes across a semi-enclosed tropical embayment" @default.
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