Nitrogen stable isotopes as an alternative for assessing mountaintop removal mining's impact on headwater streams

2015 ◽  
Vol 186 (3) ◽  
pp. 193-202 ◽  
Author(s):  
Wesley M. Daniel ◽  
Michael D. Kaller ◽  
Jeff Jack
Keyword(s):  
Stable Isotopes ◽  
Headwater Streams ◽  
Nitrogen Stable Isotopes ◽  
Mountaintop Removal

Using nitrogen stable isotopes to detect long-distance movement in a threatened cutthroat trout (Oncorhynchus clarkii utah)

2009 ◽  
Vol 66 (4) ◽  
pp. 672-682 ◽  
Author(s):  
Adam J. Sepulveda ◽  
Warren T. Colyer ◽  
Winsor H. Lowe ◽  
Mark R. Vinson
Keyword(s):  
Water Quality ◽  
Stable Isotopes ◽  
Life History ◽  
Headwater Streams ◽  
Cutthroat Trout ◽  
Trophic Levels ◽  
Life History Strategies ◽  
Nitrogen Stable Isotopes ◽  
Long Distance ◽  
Oncorhynchus Clarkii

Interior cutthroat trout occupy small fractions of their historic ranges and existing populations often are relegated to headwater habitats. Conservation requires balancing protection for isolated genetically pure populations with restoration of migratory life histories by reconnecting corridors between headwater and mainstem habitats. Identification of alternative life history strategies within a population is critical to these efforts. We tested the application of nitrogen stable isotopes to discern fluvial from resident Bonneville cutthroat trout (BCT; Oncorhynchus clarkii utah ) in a headwater stream. Fluvial BCT migrate from headwater streams with good water quality to mainstem habitats with impaired water quality. Resident BCT remain in headwater streams. We tested two predictions: (i) fluvial BCT have a higher δ15N than residents, and (ii) fluvial BCT δ15N reflects diet and δ15N enrichment characteristics of mainstem habitats. We found that fluvial δ15N was greater than resident δ15N and that δ15N was a better predictor of life history than fish size. Our data also showed that fluvial and resident BCT had high diet overlap in headwater sites and that δ15N of lower trophic levels was greater in mainstem sites than in headwater sites. We conclude that the high δ15N values of fluvial BCT were acquired in mainstem sites.

scholarly journals Assessment of trophic relationships between symbiotic tropical ophiuroids using C and N stable isotope analysis

2006 ◽  
Vol 86 (6) ◽  
pp. 1443-1447 ◽  
Author(s):  
D. Fourgon ◽  
G. Lepoint ◽  
I. Eeckhaut
Keyword(s):  
Stable Isotopes ◽  
Potential Benefit ◽  
Feeding Habits ◽  
Isotope Analysis ◽  
Tracer Experiment ◽  
Trophic Relationships ◽  
Nitrogen Stable Isotopes ◽  
Carbon And Nitrogen ◽  
C And N ◽  
The One

Analyses of the natural abundance of carbon and nitrogen stable isotopes were performed to investigate the feeding habits of two ophiuroids, Ophiomastix venosa and Ophiocoma scolopendrina, and to assess the potential benefit obtained by the symbiotic Ophiomastix venosa juveniles. A tracer experiment was also carried out to clarify the contribution of algae to the nitrogen uptake amongst the tested ophiuroids. Our results suggest that Ophiocoma scolopendrina adults occupy a higher position in the food web than Ophiomastix venosa and mainly feed on neuston. In contrast, O. venosa adults feed on the alga Sargassum densifolium and on organic matter associated with sediment. Free juveniles and symbiotic juveniles of O. venosa have intermediate δ13C values between both adult species. The high proportion of 13C in the symbiotic juveniles compared to the one in their conspecific adults indicates that their diet slightly differs from the latter and is closer to that of Ophiocoma scolopendrina. This raises the hypothesis that symbiotic juveniles steal neuston from their associated host, O. scolopendrina.

Diet and mobility in Early Medieval Bavaria: A study of carbon and nitrogen stable isotopes

2010 ◽  
Vol 143 (2) ◽  
pp. 235-249 ◽  
Author(s):  
Susanne Hakenbeck ◽  
Ellen McManus ◽  
Hans Geisler ◽  
Gisela Grupe ◽  
Tamsin O'Connell
Keyword(s):  
Stable Isotopes ◽  
Nitrogen Stable Isotopes ◽  
Early Medieval ◽  
Carbon And Nitrogen
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