Rapid communications in mass spectrometry : RCM · 2023
Geolocator-tracking seabird migration and moult reveal large-scale, temperature-driven isoscapes in the NE Atlantic.
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Atkins Kelly, Bearhop Stuart, Bodey Thomas W, Grecian W James, Hamer Keith, Pereira Jorge M, Meinertzhagen Hannah, Mitchell Chris, Morgan Greg, Morgan Lisa, Newton Jason, Sherley Richard B, Votier Stephen C
Аннотация
RATIONALE: By 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.
METHODS: Here 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 δ13 C and δ15 N in the NE Atlantic.
RESULTS: By matching winter-grown feathers with the non-breeding location of tracked birds we found latitudinal gradients in δ13 C and δ15 N 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.
CONCLUSIONS: Our study reveals the potential of using seabird GLS and feathers to reconstruct large-scale isotopic patterns.
METHODS: Here 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 δ13 C and δ15 N in the NE Atlantic.
RESULTS: By matching winter-grown feathers with the non-breeding location of tracked birds we found latitudinal gradients in δ13 C and δ15 N 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.
CONCLUSIONS: Our study reveals the potential of using seabird GLS and feathers to reconstruct large-scale isotopic patterns.