Systematic variation in the stable hydrogen isotope (δ2H) composition of fur from summer populations of two species of temperate insectivorous bats

Fraser, Erin E.; Miller, Johnston F.; Longstaffe, Fred J.; Fenton, M. Brock

doi:10.1016/j.mambio.2015.03.006

Cited by 4 publications

(6 citation statements)

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“…In contrast, fur keratin of juvenile bats was enriched by 1.6‰ in 15 N in relation to 14 N compared to fur keratin of adult females. Finally, fur keratin of juvenile bats was depleted by 13.4‰ in 2 H in relation to 1 H compared to fur keratin of adult females, which is larger than the isotopic differences observed before …”

Section: Discussionmentioning

confidence: 54%

“…Previous stable isotope studies based on mammalian fur showed an age effect of isotopic composition between juveniles and adults for hydrogen, yet no previous studies in bats included stable nitrogen and carbon isotopes. In agreement with our prediction, stable isotope ratios in fur keratin differed for the three elements between mothers and juveniles of common noctule bats captured at the same maternity roost.…”

Section: Discussionmentioning

confidence: 99%

“…Fur keratin of juvenile bats was significantly depleted by 2.9‰ in 13 C in relation to 12 which is larger than the isotopic differences observed before. 33 The most likely explanation for the difference in δ 13 C values between mothers and juveniles is that fur keratin of juvenile bats was built from 13 C-depleted fat-rich milk that juveniles consume from their mothers. The enrichment of 15 N in relation to 14 N observed in fur keratin of juvenile bats with reference to that of mothers identifies the juvenile bats as feeding on a higher trophic level than their mothers, most likely explained by the fact that they feed on milk produced by their mothers.…”

Section: Discussionmentioning

confidence: 99%

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Multiple isotope tracers in fur keratin discriminate between mothers and offspring

Kravchenko

Lehnert

Vlaschenko³

et al. 2019

Rapid Comm Mass Spectrometry

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Rationale Isoscape origin models for mammals may be impaired by fractionation and routing of isotopes during lactation. Here, we tested if the stable carbon, nitrogen and hydrogen ratios of juvenile bats differ from those of their mothers and if derived isotopic dietary niches and geographical assignments vary accordingly between mothers and juveniles. Methods During the post‐lactation period, we collected fur of juvenile and female common noctule bats (Nyctalus noctula) from the same maternity roost. Using a combination of elemental analysis and stable isotope ratio mass spectrometry, we measured the hydrogen, carbon and nitrogen isotope ratios in fur keratin. The hydrogen isotope ratios were measured for the non‐exchangeable portion of hydrogen in keratin. The derived isotopic niches and isoscape origin models were compared between mothers and juveniles. Results The fur keratin of juveniles was enriched by 1.6‰ in 15N and depleted by 2.9‰ in 13C compared with that of the mothers. In addition, the hydrogen isotope ratios were 13.4‰ lower in the fur keratin of juveniles than in that of mothers. The estimated isotopic niches of nursing females and juveniles were not overlapping and differed in size. Overall, the isoscape origin models projected juveniles as being from a more northern origin than the mothers; yet both models suggested the study site as a likely place of origin. Conclusions Our results suggest that isotope ratio data of juvenile bats should not be used for transfer functions in isoscape origin models because of isotopic routing and discrimination during lactation. Not accounting for age effects may increase the inaccuracy of geographical assignments in mammals when based on stable hydrogen isotopes.

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Section: Discussionmentioning

confidence: 54%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Multiple isotope tracers in fur keratin discriminate between mothers and offspring

Kravchenko

Lehnert

Vlaschenko³

et al. 2019

Rapid Comm Mass Spectrometry

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“…The use of species-specific transfer functions is ideal, as interspecific variation in these functions may impact origin assignment [ 67 ]. While there are strong transfer functions for many species, there is still substantial variation in the δ 2 H fur values of bats within and among species at common locations [ 68 , 69 ]. Mean δ 2 H fur values may vary significantly among proximate roosts [ 55 , 69 ] and reproductive females may have fur that is depleted of 2 H compared to juveniles [ 66 , 69 ].…”

Section: Intrinsic Markers In Studies Of Bat Migrationmentioning

confidence: 99%

“…While there are strong transfer functions for many species, there is still substantial variation in the δ 2 H fur values of bats within and among species at common locations [ 68 , 69 ]. Mean δ 2 H fur values may vary significantly among proximate roosts [ 55 , 69 ] and reproductive females may have fur that is depleted of 2 H compared to juveniles [ 66 , 69 ]. Variation among species can be even more significant.…”

Section: Intrinsic Markers In Studies Of Bat Migrationmentioning

confidence: 99%

The Use of Intrinsic Markers for Studying the Migratory Movements of Bats

Brewer

Rauch-Davis

Fraser

2021

Animals

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Mortality of migratory bat species at wind energy facilities is a well-documented phenomenon, and mitigation and management are partially constrained by the current limited knowledge of bat migratory movements. Analyses of biochemical signatures in bat tissues (“intrinsic markers”) can provide information about the migratory origins of individual bats. Many tissue samples for intrinsic marker analysis may be collected from living and dead bats, including carcasses collected at wind energy facilities. In this paper, we review the full suite of available intrinsic marker analysis techniques that may be used to study bat migration, with the goal of summarizing the current literature and highlighting knowledge gaps and opportunities. We discuss applications of the stable isotopes of hydrogen, oxygen, nitrogen, carbon, sulfur; radiogenic strontium isotopes; trace elements and contaminants; and the combination of these markers with each other and with other extrinsic markers. We further discuss the tissue types that may be analyzed for each and provide a synthesis of the generalized workflow required to link bats to origins using intrinsic markers. While stable hydrogen isotope techniques have clearly been the leading approach to infer migratory bat movement patterns across the landscape, here we emphasize a variety of lesser used intrinsic markers (i.e., strontium, trace elements, contaminants) that may address new study areas or answer novel research questions.

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Application of isoscapes to determine geographic origin of terrestrial wildlife for conservation and management

Zanden

Nelson

Wunder

et al. 2018

Biological Conservation

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Systematic variation in the stable hydrogen isotope (δ2H) composition of fur from summer populations of two species of temperate insectivorous bats

Abstract: extubation. We have observed only a moderate incidence of POUR and a low incidence of urinary infections. In addition, no correlation between POUR and worse outcome has been shown. Our data suggests that thoracic epidural analgesia is not an absolute indication of urinary drainage.

Cited by 4 publications

References 49 publications

Multiple isotope tracers in fur keratin discriminate between mothers and offspring

Multiple isotope tracers in fur keratin discriminate between mothers and offspring

The Use of Intrinsic Markers for Studying the Migratory Movements of Bats

Application of isoscapes to determine geographic origin of terrestrial wildlife for conservation and management

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