Stable isotope‐based location in a shelf sea setting: accuracy and precision are comparable to light‐based location methods

Trueman, Clive N.; MacKenzie, Kirsteen M.; Glew, Katie St John

doi:10.1111/2041-210x.12651

Cited by 39 publications

(66 citation statements)

References 49 publications

(126 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The carbon and nitrogen isoscapes for the North Sea produced by Trueman et al (2017) were used to assign seabirds to likely foraging areas. Although these isoscapes were produced from samples collected in summer 2015, the spatial distribution of δ 13 C and δ…”

Section: Population Level Assignmentmentioning

confidence: 99%

“…If the reference isoscape is created using tissues from species other than the species to be assigned, then some form of isotopic offset or calibration is needed (e.g. Bowen et al 2014, Trueman et al 2017. Consumer tissues typically have higher δ…”

mentioning

confidence: 99%

“…N values in consumers within the North Sea are relatively stable over time (MacKenzie et al 2014, Trueman et al 2017. Seasonal variations in isotopic compositions of primary producers and low trophic level consumers are probable (Kürten et al 2013) but are likely attenuated during successive predator− prey interactions so that higher trophic level consumers (such as the jellyfish used to construct the isoscape and seabirds) inherit isotopic compositions that reflect a seasonal average value.…”

mentioning

confidence: 99%

“…Therefore, we assumed that the time difference between isoscape construction and collection of bird samples is unlikely to significantly influence geographic assignments at the broad spatial scales considered here. Isotope values for each species and feather type were used to identify a most likely spatial origin within the North Sea using continuous assignment methods following Trueman et al (2017) and Vander Zanden et al (2015). Assignments were made by estimating the likelihood that each raster cell of the North Sea carbon and nitrogen isoscapes represented the foraging area of each individual, using the bivariate normal probability function (Vander Zanden et al 2015, Trueman et al 2017.…”

mentioning

confidence: 99%

“…Isotope values for each species and feather type were used to identify a most likely spatial origin within the North Sea using continuous assignment methods following Trueman et al (2017) and Vander Zanden et al (2015). Assignments were made by estimating the likelihood that each raster cell of the North Sea carbon and nitrogen isoscapes represented the foraging area of each individual, using the bivariate normal probability function (Vander Zanden et al 2015, Trueman et al 2017. Assignment results indicate the likely origin of food re sources that the birds used during the period of feather growth.…”

mentioning

confidence: 99%

See 4 more Smart Citations

Moult location and diet of auks in the North Sea inferred from coupled light-based and isotopebased geolocation

Glew¹,

Wanless²,

Harris³

et al. 2018

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

Many pelagic seabirds moult their feathers while at sea, which is an energetically costly behaviour. Mortality rates during moult can be high, so spatial and trophic ecology during this critical period is important for understanding demographic patterns. Unfortunately, individual foraging behaviours specifically linked to at-sea moulting are commonly unclear. This paper combines 2 different approaches to geolocation: data from bird-borne geolocation loggers and stableisotope assignment using carbon and nitrogen isotope maps (isoscapes). Coupling 2 geolocation processes allows some uncertainties associated with isotope-based assignment to be constrained. We applied this approach to quantify species-specific foraging locations and individual trophic variability during feather regrowth in 3 sympatric auk populations breeding on the Isle of May, Scotland (common guillemot Uria aalge, razorbill Alca torda and Atlantic puffin Fratercula arctica). Inferred foraging areas during moult differed between species and feather types. Guillemots likely underwent moult within the southern North Sea, razorbills along the east coast of England and into the southern North Sea and puffins off the east coast of Scotland. Estimates of individual trophic position varied considerably within feather types (up to 1 trophic level difference between individuals), among feather types grown during different time periods and across the 3 species, with guillemots consistently foraging at higher trophic positions than razorbills and puffins. Used in combination, these methods better constrain foraging areas during moulting, and provide a technique to explore individual differences and flexibility in foraging strategy, which is valuable information for both seabird conservation and marine spatial planning.

show abstract

Section: Population Level Assignmentmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Moult location and diet of auks in the North Sea inferred from coupled light-based and isotopebased geolocation

Glew¹,

Wanless²,

Harris³

et al. 2018

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

show abstract

Using ocean models to predict spatial and temporal variation in marine carbon isotopes

et al. 2017

View full text Add to dashboard Cite

Abstract. Natural-abundance stable isotope ratios provide a wealth of ecological information relating to food web structure, trophic level, and location. The correct interpretation of stable isotope data requires an understanding of spatial and temporal variation in the isotopic compositions at the base of the food web. In marine pelagic environments, accurate interpretation of stable isotope data is hampered by a lack of reliable, spatio-temporally distributed measurements of baseline isotopic compositions. In this study, we present a relatively simple, process-based carbon isotope model that predicts the spatio-temporal distributions of the carbon isotope composition of phytoplankton (here expressed as d 13 C PLK ) across the global ocean at one degree and monthly resolution. The model is driven by output from a coupled physics-biogeochemistry model, NEMO-MEDUSA, and operates offline; it could also be coupled to alternative underlying ocean model systems. Model validation is challenged by the same lack of spatio-temporally explicit data that motivates model development, but predictions from our model successfully reproduce major spatial patterns in carbon isotope values observed in zooplankton, and are consistent with simulations from alternative models. Model predictions represent an initial hypothesis of spatial and temporal variation in carbon isotopic baselines in ocean areas where a few data are currently available, and provide the best currently available tool to estimate spatial and temporal variation in baseline isotopic compositions at ocean basin to global scales.

show abstract

Geolocator‐tracking seabird migration and moult reveal large‐scale, temperature‐driven isoscapes in the NE Atlantic

Atkins

Bearhop

Bodey

et al. 2023

Rapid Comm Mass Spectrometry

View full text Add to dashboard Cite

RationaleBy combining precision satellite‐tracking with blood sampling, seabirds can be used to validate marine carbon and nitrogen isoscapes, but it is unclear whether a comparable approach using low‐precision light‐level geolocators (GLS) and feather sampling can be similarly effective.MethodsHere we used GLS to identify wintering areas of northern gannets (Morus bassanus) and sampled winter grown feathers (confirmed from image analysis of non‐breeding birds) to test for spatial gradients in δ13C and δ15N in the NE Atlantic.ResultsBy matching winter‐grown feathers with the non‐breeding location of tracked birds we found latitudinal gradients in δ13C and δ15N in neritic waters. Moreover, isotopic patterns were best explained by sea surface temperature. Similar isotope gradients were found in fish muscle sampled at local ports.ConclusionsOur study reveals the potential of using seabird GLS and feathers to reconstruct large‐scale isotopic patterns.

show abstract

Stable isotope‐based location in a shelf sea setting: accuracy and precision are comparable to light‐based location methods

Abstract: Stable--isotope based location in a shelf sea setting: accuracy and precision are 1 comparable to light--based location methods. 2 3

Cited by 39 publications

References 49 publications

Moult location and diet of auks in the North Sea inferred from coupled light-based and isotopebased geolocation

Moult location and diet of auks in the North Sea inferred from coupled light-based and isotopebased geolocation

Using ocean models to predict spatial and temporal variation in marine carbon isotopes

Geolocator‐tracking seabird migration and moult reveal large‐scale, temperature‐driven isoscapes in the NE Atlantic

Contact Info

Product

Resources

About