Multi‐tissue δ<sup>2</sup>H analysis reveals altitudinal migration and tissue‐specific discrimination patterns in <i>Cinclodes</i>

Newsome, Seth D.; Sabat, Pablo; Wolf, Nathan; Rader, Jonathan A.; Rio, Carlos Martı́nez del

doi:10.1890/es15-00086.1

Cited by 26 publications

(32 citation statements)

References 55 publications

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“…Previous studies with Andean birds have shown that whole blood had significantly lower δ 2 H values at a given elevation than feathers (Hardesty and Fraser , Newsome et al. ), a pattern also observed in our data (Fig. C).…”

Section: Discussionsupporting

confidence: 89%

“…Finally, a recent study compared δ 2 H, δ 13 C and δ 15 N values in metabolically inert and active tissues of Ovenbirds (Furnariidae, genus Cinclodes ) in Chile, and found that individual δ 2 H offsets between feather and muscle are a reliable proxy for evaluating elevational migration; this study also reported variation in elevational and latitudinal migration at the species, population, and individual level (Newsome et al. ).…”

Section: Introductionmentioning

confidence: 64%

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Seasonal patterns in δ²H values of multiple tissues from Andean birds provide insights into elevational migration

Villegas

Newsome

Blake

2016

Ecological Applications

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Abstract. Elevational migration is a widespread phenomenon in tropical avifauna but it is difficult to identify using traditional approaches. Hydrogen isotope (δ 2 H) values of precipitation decrease with elevation so δ 2 H analysis of multiple bird tissues with different isotopic incorporation rates may be a reliable method for characterizing seasonal elevational migration. Here we compare δ 2 H values in metabolically inert (feathers and claws) and metabolically active (whole blood) tissues to examine whether an upslope migration occurs prior to the breeding season in the Yungas Manakin (Chiroxiphia boliviana). We compare results from C. boliviana with data from a known elevational migrant, the Streak-necked Flycatcher (Mionectes striaticollis). Opposite to our expectations, tissue δ 2 H values increased over time, largely reflecting seasonal patterns in precipitation δ 2 H rather than elevational effects; linear mixed-effects models with strongest support included ordinal date, tissue type, and elevation. This seasonal increase in precipitation δ 2 H is a general phenomenon in both tropical and temperate mountain ranges. We use these data to propose a hypothetical framework that predicts different patterns in tissue δ 2 H values collected in different seasons from residents and elevational migrants. This framework can serve as a reference for future studies that assess elevational migration in birds and other animals.

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Section: Discussionsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 64%

Seasonal patterns in δ²H values of multiple tissues from Andean birds provide insights into elevational migration

Villegas

Newsome

Blake

2016

Ecological Applications

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“…, Newsome et al. ). However, values of stable hydrogen isotope (deuterium) in the feathers, claws, and blood of birds have been used by some investigators to study altitudinal migration (Hobson et al.…”

Section: Resultsmentioning

confidence: 99%

“…) and stable‐isotope analysis has no mass or size limitations (Newsome et al. ). In addition, we must take into account the spatial and temporal variation in bird communities (Loiselle and Blake , Alves ), as well as the demographics of migrating birds (Boyle ).…”

Section: Resultsmentioning

confidence: 99%

Altitudinal migration by birds: a review of the literature and a comprehensive list of species

2017

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Altitudinal migration is the seasonal altitudinal movement of birds from breeding areas to non‐breeding or wintering areas at different elevations. Although this type of migration is widely reported, questions remain concerning the number of species that perform altitudinal migration, possible variation among different taxa and geographic locations in the extent of altitudinal migration, and the foraging guilds of altitudinal migrants. We conducted an extensive bibliographic survey and compiled a list of altitudinal migrant birds worldwide. We characterized species in terms of their foraging guilds because the spatial distribution of food resources along altitudinal gradients is often evoked as a driver of bird altitudinal migration. We identified 1238 species of altitudinal migrants, ~10% of the ~10,000 extant species of birds. We found a strong geographic bias in publications focusing on avian altitudinal migration toward the United States and Costa Rica, and a paucity of studies in megadiverse regions such as the Afrotropical and Indomalayan realms, and areas in the Neotropics other than Costa Rica. We also found that most species of altitudinal migrants were invertivores rather than frugivores or nectarivores. This general pattern held true for all zoogeographic realms except the Neotropics, where nectarivores and frugivores predominated among altitudinal migrants. The prevalence of invertivore birds among altitudinal migrants is not unexpected because this is the most common foraging guild among birds worldwide. Overall, we found no prevalence of any specific foraging guild among altitudinal migrants across zoogeographic regions. The results of studies to date suggest that altitudinal migration by birds may be driven by a number of factors, including access to increased food resources for breeding or molting, weather conditions, and mating and nesting opportunities. However, to better understand the mechanisms underlying altitudinal migration, broadening the geographic scope of studies is paramount, with additional study of altitudinal migration especially needed in the megadiverse tropical regions of sub‐Saharan Africa, Southeast Asia, and South America.

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“…, , Newsome et al. ). At present, the mechanism for tissue‐specific δ 2 H discrimination is unknown, but differences in amino acid composition among tissues coupled with recent evidence that δ 2 H among individual amino acids can vary by >250‰ (Fogel et al.…”

Section: Discussionmentioning

confidence: 99%

Assimilation and isotopic discrimination of hydrogen in tilapia: implications for studying animal diet with δ²H

et al. 2017

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Abstract. Hydrogen isotope (d 2Η) analysis has become a valuable tool in the study of animal migration; however, the biochemical framework required for ecologists to confidently apply d 2 Η to quantify resourceuse has yet to be adequately resolved. sources? We completed a 3 9 3 controlled feeding experiment on Nile tilapia (Oreochromis niloticus) in which we varied the d 2 Η of tank water and dietary macromolecules to examine these questions in two tissues commonly analyzed by ecologists: muscle and liver. We found that the proportion of hydrogen in tilapia tissue derived from tank water was similar for muscle (~23%) and liver (~25%). We then used linear regression and an isotope mixing model based on accompanying d 13 C data to estimate the proportion of hydrogen in muscle and liver tissue derived from dietary protein (34-44%), cornmeal (21-27%), corn syrup (4-5%), and lipids (≤1%). With this information and the d 2 Η values of water, protein, carbohydrates, and lipids supplied to fish in each treatment, we calculated D 2 H net values of À47& AE 5& for muscle and À41& AE 5& for liver. Our experiment is the first to quantify the relative proportion of hydrogen from different dietary macromolecules used by an omnivore to synthesize its tissues. Such information is needed to further refine the use of d 2 Η analysis as a dietary tracer for aquatic animals.

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Multi‐tissue δ²H analysis reveals altitudinal migration and tissue‐specific discrimination patterns in Cinclodes

Cited by 26 publications

References 55 publications

Seasonal patterns in δ²H values of multiple tissues from Andean birds provide insights into elevational migration

Seasonal patterns in δ²H values of multiple tissues from Andean birds provide insights into elevational migration

Altitudinal migration by birds: a review of the literature and a comprehensive list of species

Assimilation and isotopic discrimination of hydrogen in tilapia: implications for studying animal diet with δ²H

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Multi‐tissue δ2H analysis reveals altitudinal migration and tissue‐specific discrimination patterns in Cinclodes

Cited by 26 publications

References 55 publications

Seasonal patterns in δ2H values of multiple tissues from Andean birds provide insights into elevational migration

Seasonal patterns in δ2H values of multiple tissues from Andean birds provide insights into elevational migration

Altitudinal migration by birds: a review of the literature and a comprehensive list of species

Assimilation and isotopic discrimination of hydrogen in tilapia: implications for studying animal diet with δ2H

Contact Info

Product

Resources

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Multi‐tissue δ²H analysis reveals altitudinal migration and tissue‐specific discrimination patterns in Cinclodes

Seasonal patterns in δ²H values of multiple tissues from Andean birds provide insights into elevational migration

Seasonal patterns in δ²H values of multiple tissues from Andean birds provide insights into elevational migration

Assimilation and isotopic discrimination of hydrogen in tilapia: implications for studying animal diet with δ²H