A critical assessment of marine predator isoscapes within the southern Indian Ocean
Abstract Background Precise and accurate retrospective geolocation of marine predators via their tissues’ isotopic composition relies on quality reference maps of relevant isotopic gradients (“isoscapes”). Additionally, a good working knowledge of any discrimination factors that may offset a marine...
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ftdoajarticles:oai:doaj.org/article:02675caff4ff41c8a5c43d80b6216edf 2023-05-15T16:19:44+02:00 A critical assessment of marine predator isoscapes within the southern Indian Ocean Tegan Carpenter-Kling Pierre Pistorius Ryan Reisinger Yves Cherel Maëlle Connan 2020-06-01T00:00:00Z https://doi.org/10.1186/s40462-020-00208-8 https://doaj.org/article/02675caff4ff41c8a5c43d80b6216edf EN eng BMC http://link.springer.com/article/10.1186/s40462-020-00208-8 https://doaj.org/toc/2051-3933 doi:10.1186/s40462-020-00208-8 2051-3933 https://doaj.org/article/02675caff4ff41c8a5c43d80b6216edf Movement Ecology, Vol 8, Iss 1, Pp 1-18 (2020) Geolocation Stable isotope ecology Southern Ocean Seabirds Procellariiformes Penguins Biology (General) QH301-705.5 article 2020 ftdoajarticles https://doi.org/10.1186/s40462-020-00208-8 2022-12-31T03:06:49Z Abstract Background Precise and accurate retrospective geolocation of marine predators via their tissues’ isotopic composition relies on quality reference maps of relevant isotopic gradients (“isoscapes”). Additionally, a good working knowledge of any discrimination factors that may offset a marine predator’s isotopic composition from baseline isotopic values, as well as tissue specific retention rates, are imperative. We provide a critical assessment of inter-specific differences among marine predator-level isoscapes within the Indian Sector of the Southern Ocean. Methods We combined fine-scale GPS tracking data and concurrent blood plasma δ13C and δ15N values of eight seabird species (three albatross, two giant petrel and three penguin species) breeding at Marion Island to produce species- and guild-specific isoscapes. Results Overall, our study revealed latitudinal spatial gradients in both δ13C and δ15N for far-ranging seabirds (albatrosses and giant petrels) as well as inshore-offshore gradients for near-ranging seabirds (penguins). However, at the species level, latitudinal spatial gradients were not reflected in the δ13C and δ15N isoscapes of two and three, respectively, of the five far-ranging species studied. It is therefore important when possible to estimate and apply species-specific isoscapes or have a good understanding of any factors and pathways affecting marine predators’ isotopic composition when estimating the foraging distribution of marine predators via their tissues’ stable isotope compositions. Conclusions Using a multi-species approach, we provide evidence of large and regional scale systematic spatial variability of δ13C and δ15N at the base of the marine food web that propagates through trophic levels and is reflected in the isotopic composition of top predators’ tissues. Article in Journal/Newspaper Giant Petrel Giant Petrels Marion Island Southern Ocean Directory of Open Access Journals: DOAJ Articles Southern Ocean Indian Movement Ecology 8 1 |
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Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Geolocation Stable isotope ecology Southern Ocean Seabirds Procellariiformes Penguins Biology (General) QH301-705.5 |
spellingShingle |
Geolocation Stable isotope ecology Southern Ocean Seabirds Procellariiformes Penguins Biology (General) QH301-705.5 Tegan Carpenter-Kling Pierre Pistorius Ryan Reisinger Yves Cherel Maëlle Connan A critical assessment of marine predator isoscapes within the southern Indian Ocean |
topic_facet |
Geolocation Stable isotope ecology Southern Ocean Seabirds Procellariiformes Penguins Biology (General) QH301-705.5 |
description |
Abstract Background Precise and accurate retrospective geolocation of marine predators via their tissues’ isotopic composition relies on quality reference maps of relevant isotopic gradients (“isoscapes”). Additionally, a good working knowledge of any discrimination factors that may offset a marine predator’s isotopic composition from baseline isotopic values, as well as tissue specific retention rates, are imperative. We provide a critical assessment of inter-specific differences among marine predator-level isoscapes within the Indian Sector of the Southern Ocean. Methods We combined fine-scale GPS tracking data and concurrent blood plasma δ13C and δ15N values of eight seabird species (three albatross, two giant petrel and three penguin species) breeding at Marion Island to produce species- and guild-specific isoscapes. Results Overall, our study revealed latitudinal spatial gradients in both δ13C and δ15N for far-ranging seabirds (albatrosses and giant petrels) as well as inshore-offshore gradients for near-ranging seabirds (penguins). However, at the species level, latitudinal spatial gradients were not reflected in the δ13C and δ15N isoscapes of two and three, respectively, of the five far-ranging species studied. It is therefore important when possible to estimate and apply species-specific isoscapes or have a good understanding of any factors and pathways affecting marine predators’ isotopic composition when estimating the foraging distribution of marine predators via their tissues’ stable isotope compositions. Conclusions Using a multi-species approach, we provide evidence of large and regional scale systematic spatial variability of δ13C and δ15N at the base of the marine food web that propagates through trophic levels and is reflected in the isotopic composition of top predators’ tissues. |
format |
Article in Journal/Newspaper |
author |
Tegan Carpenter-Kling Pierre Pistorius Ryan Reisinger Yves Cherel Maëlle Connan |
author_facet |
Tegan Carpenter-Kling Pierre Pistorius Ryan Reisinger Yves Cherel Maëlle Connan |
author_sort |
Tegan Carpenter-Kling |
title |
A critical assessment of marine predator isoscapes within the southern Indian Ocean |
title_short |
A critical assessment of marine predator isoscapes within the southern Indian Ocean |
title_full |
A critical assessment of marine predator isoscapes within the southern Indian Ocean |
title_fullStr |
A critical assessment of marine predator isoscapes within the southern Indian Ocean |
title_full_unstemmed |
A critical assessment of marine predator isoscapes within the southern Indian Ocean |
title_sort |
critical assessment of marine predator isoscapes within the southern indian ocean |
publisher |
BMC |
publishDate |
2020 |
url |
https://doi.org/10.1186/s40462-020-00208-8 https://doaj.org/article/02675caff4ff41c8a5c43d80b6216edf |
geographic |
Southern Ocean Indian |
geographic_facet |
Southern Ocean Indian |
genre |
Giant Petrel Giant Petrels Marion Island Southern Ocean |
genre_facet |
Giant Petrel Giant Petrels Marion Island Southern Ocean |
op_source |
Movement Ecology, Vol 8, Iss 1, Pp 1-18 (2020) |
op_relation |
http://link.springer.com/article/10.1186/s40462-020-00208-8 https://doaj.org/toc/2051-3933 doi:10.1186/s40462-020-00208-8 2051-3933 https://doaj.org/article/02675caff4ff41c8a5c43d80b6216edf |
op_doi |
https://doi.org/10.1186/s40462-020-00208-8 |
container_title |
Movement Ecology |
container_volume |
8 |
container_issue |
1 |
_version_ |
1766006145847132160 |