Stable isotope signatures in historic harbor seal bone link food web‐assimilated carbon and nitrogen resources to a century of environmental change

2021 ◽  
Author(s):  
Megan L. Feddern ◽  
Gordon W. Holtgrieve ◽  
Eric J. Ward
Keyword(s):  
Stable Isotope ◽  
Environmental Change ◽  
Food Web ◽  
Harbor Seal ◽  
Carbon And Nitrogen ◽  
Stable Isotope Signatures

Carbon and nitrogen stable isotope signatures of deep-sea meiofauna follow oceanographical gradients across the Southern Ocean

2013 ◽  
Vol 110 ◽  
pp. 69-79 ◽  
Author(s):  
Gritta Veit-Köhler ◽  
Katja Guilini ◽  
Ilka Peeken ◽  
Petra Quillfeldt ◽  
Christoph Mayr
Keyword(s):  
Stable Isotope ◽  
Southern Ocean ◽  
Deep Sea ◽  
Nitrogen Stable Isotope ◽  
Carbon And Nitrogen ◽  
Stable Isotope Signatures

scholarly journals Spatio-temporal stable isotope variation of a benthic primary consumer in a simple food web in a strongly acidic lake

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e7890 ◽  
Author(s):  
Hideyuki Doi ◽  
Eisuke Kikuchi ◽  
Shigeto Takagi ◽  
Shuichi Shikano
Keyword(s):  
Stable Isotope ◽  
Temporal Variation ◽  
Food Web ◽  
Isotope Composition ◽  
Isotope Ratios ◽  
Stable Isotope Composition ◽  
Nitrogen Stable Isotope ◽  
Chironomid Larvae ◽  
Carbon And Nitrogen ◽  
Spatio Temporal

Analysis of aquatic food webs is typically undertaken using carbon and nitrogen stable isotope composition of consumer and producer species. However, the trophic consequences of spatio-temporal variation in the isotope composition of consumers have not been well evaluated. Lake Katanuma, Japan, is highly acidic and has only one dominant species of benthic alga and one planktonic microalga, making it a prime system for studying trophic relationships between primary consumers and producers. In this simple lake food web, we conducted a field survey to evaluate spatial and temporal variation in the carbon and nitrogen stable isotope composition of a chironomid larvae in association with a single benthic and planktonic alga. We found a significant correlation between carbon stable isotope ratios of the chironomid larvae and the benthic diatom species in the lake. Thus, chironomid larvae may represent a reliable isotopic baseline for estimating isotope values in benthic diatoms. However, although the correlation held in shallow water, at four m depths, there was no significant relationship between the isotope ratios of chironomids and benthic diatoms, probably because deep-water larvae spend part of their life cycle migrating from the lake shore to deeper water. The differing isotope ratios of deeper chironomid tissues likely reflect the feeding history of individuals during this migration.

scholarly journals The influence of breeding colony and sex on mercury, selenium and lead levels and carbon and nitrogen stable isotope signatures in summer and winter feathers of Calonectris shearwaters

Oecologia ◽  
2008 ◽  
Vol 159 (2) ◽  
pp. 345-354 ◽  
Author(s):  
Raül Ramos ◽  
Jacob González-Solís ◽  
Manuela G. Forero ◽  
Rocío Moreno ◽  
Elena Gómez-Díaz ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Nitrogen Stable Isotope ◽  
Breeding Colony ◽  
Carbon And Nitrogen ◽  
Stable Isotope Signatures ◽  
Lead Levels

A seasonal survey of the food web in the Lapalme Lagoon (northwestern Mediterranean) assessed by carbon and nitrogen stable isotope analysis

2007 ◽  
Vol 73 (1-2) ◽  
pp. 299-315 ◽  
Author(s):  
Antoine Carlier ◽  
Pascal Riera ◽  
Jean-Michel Amouroux ◽  
Jean-Yves Bodiou ◽  
Karine Escoubeyrou ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Food Web ◽  
Stable Isotope Analysis ◽  
Isotope Analysis ◽  
Nitrogen Stable Isotope ◽  
Carbon And Nitrogen ◽  
Northwestern Mediterranean

The structure of a food web in a tropical rain forest in Malaysia based on carbon and nitrogen stable isotope ratios

2010 ◽  
Vol 26 (2) ◽  
pp. 205-214 ◽  
Author(s):  
Fujio Hyodo ◽  
Takashi Matsumoto ◽  
Yoko Takematsu ◽  
Tamaki Kamoi ◽  
Daisuke Fukuda ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Food Web ◽  
Food Webs ◽  
Rain Forest ◽  
Tropical Rain Forest ◽  
Stable Isotope Ratios ◽  
Trophic Groups ◽  
Nitrogen Stable Isotope ◽  
Carbon And Nitrogen ◽  
Below Ground

Abstract:Carbon and nitrogen stable isotope ratios (δ13C and δ15N) have been used to study the structure of food webs. However, few studies have examined how a terrestrial food web can be depicted by this technique. We measured δ13C and δ15N in various consumers of four trophic groups (detritivores, herbivores, omnivores and predators), including vertebrates and invertebrates (14 orders, ≥24 families), as well as canopy and understorey leaves in a tropical rain forest in Malaysia. We found that δ13C and δ15N of the consumers differed significantly among the trophic groups. The predators had significantly higher δ13C than the herbivores, and were similar in δ13C to the detritivores, suggesting that most predators examined depend largely on below-ground food webs. δ15N was higher in predators than detritivores by about 3‰. The comparison of δ13C in plant materials and herbivores suggests that most herbivores are dependent on C fixed in the canopy layers. The vertebrates had significantly higher δ15N and δ13C than the invertebrates of the same trophic group, likely reflecting differences in the physiological processes and/or feeding habits. This study indicates that stable isotope techniques can help better understanding of the terrestrial food webs in terms of both trophic level and the linkage of above- and below-ground systems.

scholarly journals Fatty acids and stable isotope signatures of first-year and multiyear sea ice in the Canadian High Arctic

Elem Sci Anth ◽  
2020 ◽  
Vol 8 (1) ◽  
Author(s):  
Doreen Kohlbach ◽  
Steven W. Duerksen ◽  
Benjamin A. Lange ◽  
Joannie Charette ◽  
Anke Reppchen ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Sea Ice ◽  
Food Web ◽  
Relative Proportion ◽  
High Arctic ◽  
First Year ◽  
Biochemical Processes ◽  
Food Web Interactions ◽  
Stable Isotope Signatures ◽  
Critical Components

Ice algae are critical components to the lipid-driven Arctic marine food web, particularly early in the spring. As little is known about these communities in multiyear ice (MYI), we aimed to provide a baseline of fatty acid (FA) and stable isotope signatures of sea-ice communities in MYI from the Lincoln Sea and compare these biomarkers to first-year ice (FYI). Significant differences in the relative proportions of approximately 25% of the identified FAs and significantly higher nitrogen stable isotope values (δ15N) in bottom-ice samples of FYI (δ15N = 6.4 ± 0.7%) compared to MYI (δ15N = 5.0 ± 0.4%) reflect different community compositions in the two ice types. Yet, the relative proportion of diatom- and dinoflagellate-associated FAs, as well as their bulk and most of the FA-specific carbon stable isotope compositions (δ13C) were not significantly different between bottom FYI (bulk δ13C: –28.4% to –26.7%, FA average δ13C: –34.4% to –31.7%) and MYI (bulk δ13C: –27.6% to –27.2%, FA average δ13C: –33.6% to –31.9%), suggesting at least partly overlapping community structures and similar biochemical processes within the ice. Diatom-associated FAs contributed, on average, 28% and 25% to the total FA content of bottom FYI and MYI, respectively, indicating that diatoms play a central role in structuring sea-ice communities in the Lincoln Sea. The differences in FA signatures of FYI and MYI support the view that different ice types harbor different inhabitants and that the loss of Arctic MYI will impact complex food web interactions with ice-associated ecosystems. Comparable nutritional quality of FAs, however, as indicated by similar average levels of polyunsaturated FAs in bottom FYI (33%) and MYI (28%), could help to ensure growth and reproduction of ice-associated grazers despite the shift from a MYI to FYI-dominated sea-ice cover with ongoing climate warming.

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