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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2020
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Online Access: | http://dx.doi.org/10.1186/s40462-020-00208-8 https://link.springer.com/content/pdf/10.1186/s40462-020-00208-8.pdf https://link.springer.com/article/10.1186/s40462-020-00208-8/fulltext.html |
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crspringernat:10.1186/s40462-020-00208-8 2023-05-15T16:19:44+02:00 A critical assessment of marine predator isoscapes within the southern Indian Ocean Carpenter-Kling, Tegan Pistorius, Pierre Reisinger, Ryan Cherel, Yves Connan, Maëlle National Research Foundation 2020 http://dx.doi.org/10.1186/s40462-020-00208-8 https://link.springer.com/content/pdf/10.1186/s40462-020-00208-8.pdf https://link.springer.com/article/10.1186/s40462-020-00208-8/fulltext.html en eng Springer Science and Business Media LLC https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 CC-BY Movement Ecology volume 8, issue 1 ISSN 2051-3933 Ecology, Evolution, Behavior and Systematics journal-article 2020 crspringernat https://doi.org/10.1186/s40462-020-00208-8 2022-01-04T10:44:31Z 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 δ 13 C and δ 15 N 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 δ 13 C and δ 15 N 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 δ 13 C and δ 15 N 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 δ 13 C and δ 15 N 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 Springer Nature (via Crossref) Indian Southern Ocean Movement Ecology 8 1 |
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Open Polar |
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Springer Nature (via Crossref) |
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crspringernat |
language |
English |
topic |
Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Ecology, Evolution, Behavior and Systematics Carpenter-Kling, Tegan Pistorius, Pierre Reisinger, Ryan Cherel, Yves Connan, Maëlle A critical assessment of marine predator isoscapes within the southern Indian Ocean |
topic_facet |
Ecology, Evolution, Behavior and Systematics |
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 δ 13 C and δ 15 N 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 δ 13 C and δ 15 N 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 δ 13 C and δ 15 N 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 δ 13 C and δ 15 N at the base of the marine food web that propagates through trophic levels and is reflected in the isotopic composition of top predators’ tissues. |
author2 |
National Research Foundation |
format |
Article in Journal/Newspaper |
author |
Carpenter-Kling, Tegan Pistorius, Pierre Reisinger, Ryan Cherel, Yves Connan, Maëlle |
author_facet |
Carpenter-Kling, Tegan Pistorius, Pierre Reisinger, Ryan Cherel, Yves Connan, Maëlle |
author_sort |
Carpenter-Kling, Tegan |
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 |
Springer Science and Business Media LLC |
publishDate |
2020 |
url |
http://dx.doi.org/10.1186/s40462-020-00208-8 https://link.springer.com/content/pdf/10.1186/s40462-020-00208-8.pdf https://link.springer.com/article/10.1186/s40462-020-00208-8/fulltext.html |
geographic |
Indian Southern Ocean |
geographic_facet |
Indian Southern Ocean |
genre |
Giant Petrel Giant Petrels Marion Island Southern Ocean |
genre_facet |
Giant Petrel Giant Petrels Marion Island Southern Ocean |
op_source |
Movement Ecology volume 8, issue 1 ISSN 2051-3933 |
op_rights |
https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1186/s40462-020-00208-8 |
container_title |
Movement Ecology |
container_volume |
8 |
container_issue |
1 |
_version_ |
1766006148889051136 |