Using stable isotope to compare the habitat use and trophic level between the new and old breeding range of wild Crested Ibis in the early breeding season

Xu, Xianglong; Jiang, Jiahu; Yu, Lei; Wang, Chao; Qing, Baoping; Ding, Changqing

doi:10.1016/j.avrs.2022.100007

Cited by 4 publications

(2 citation statements)

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“…Most Lepidoptera found were small butterflies, moths, or larvae. It has been found that the stable isotope values of animals increase as size increases [19], and the small number of lepidopteran individuals consumed may explain their low contribution rate in the stable isotope analysis.…”

Section: Discussionmentioning

confidence: 99%

“…In birds, trophic niche studies usually use direct observation [17] and gastrointestinal content analysis [18]; these methods require substantial time and manpower, conflict with non-invasive studies of endangered wildlife, and can only identify a small percentage of food resources [4,19]. Compared to traditional methods, stable isotope analysis overcomes these limitations to evaluate the dietary composition of consumers using tissue synthesis based on the metabolic activity on different time scales [19,20]. In birds, feathers remain metabolically inert, and keratin in feathers stops isotope fractionation; because of this, the isotopic information recorded in feather tissue reflects the dietary composition during molting the previous year [21,22].…”

Section: Introductionmentioning

confidence: 99%

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Trophic Niche Differentiation in Two Sympatric Nuthatch Species (Sitta yunnanensis and Sitta nagaensis)

Guo,

Lu,

Xie

et al. 2024

Animals

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Sympatric closely related species may experience interspecific trophic competition due to ecological similarity; they may isolate in terms of diet or habitat use as a strategy to avoid competition. The body tissues of consumers contain stable isotope signatures information that can be applied to infer their dietary information. In this study, δ13C and δ15N stable isotopes were analyzed to determine the dietary information and trophic niches of sympatric coexisting Sitta yunnanensis and Sitta nagaensis. The results showed that the food sources of S. yunnanensis and S. nagaensis were from six orders, including Orthoptera, and the cumulative contribution rate was 99.97%, with the two species eating similar diets but at different rates. The larger δ13C of S. yunnanensis indicates that it had a wider range of habitats for feeding, while the difference in δ15N values was not significant (p > 0.05), indicating that both species feed on similar nutrient levels. As determined by Bayesian ellipses, the isotopic niches of S. yunnanensis and S. nagaensis were differentiated; the isotopic niche width of S. yunnanensis is 2.69‰2, which was larger than that of S. nagaensis (0.73‰2), indicates that differentiation between the two species in diet or habitat use reduced competition. Trophic niche differentiation and differences in foraging proportions may be the principal resource allocation mechanisms behind S. yunnanensis and S. nagaensis coexistence.

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Section: Discussionmentioning

confidence: 99%