Animal tracing with sulfur isotopes : Spatial segregation and climate variability in Africa likely contribute to population trends of a migratory songbird
Brlík, Vojtěch ; Procházka, Petr ; Hansson, Bengt LU
; Stricker, Craig A.
; Yohannes, Elizabeth
; Powell, Rebecca L.
and Wunder, Michael B.
(2023)
In Journal of Animal Ecology
92(7).
p.1320-1331
- Abstract
Climatic conditions affect animals but range-wide impacts at the population level remain largely unknown, especially in migratory species. However, studying climate–population relationships is still challenging in small migrants due to a lack of efficient and cost-effective geographic tracking method. Spatial distribution patterns of environmental stable isotopes (so called ‘isoscapes’) generally overcome these limitations but none of the currently available isoscapes provide a substantial longitudinal gradient in species-rich sub-Saharan Africa. In this region, sulphur (δ34S) has not been sufficiently explored on a larger scale. We developed a δ34S isoscape to trace animal origins in sub-Saharan Africa by coupling... (More)
Climatic conditions affect animals but range-wide impacts at the population level remain largely unknown, especially in migratory species. However, studying climate–population relationships is still challenging in small migrants due to a lack of efficient and cost-effective geographic tracking method. Spatial distribution patterns of environmental stable isotopes (so called ‘isoscapes’) generally overcome these limitations but none of the currently available isoscapes provide a substantial longitudinal gradient in species-rich sub-Saharan Africa. In this region, sulphur (δ34S) has not been sufficiently explored on a larger scale. We developed a δ34S isoscape to trace animal origins in sub-Saharan Africa by coupling known-origin samples from tracked migratory birds with continental remotely sensed environmental data building on environment–δ34S relationships using a flexible machine learning technique. Furthermore, we link population-specific nonbreeding grounds with interannual climatic variation that might translate to breeding population trends. The predicted δ34S isotopic map featured east–west and coast-to-inland isotopic gradients and was applied to predict nonbreeding grounds of three breeding populations of Eurasian Reed Warblers Acrocephalus scirpaceus with two distinct migratory phenotypes. Breeding populations as well as migratory phenotypes exhibited large-scale segregation within the African nonbreeding range. These regions also differed substantially in the interannual climatic variation, with higher interannual variability in the eastern part of the range during 2001–2012. Over the same period, the eastern European breeding population seemed to have experienced a more steep decline in population size. The link between migratory patterns and large-scale climatic variability appears important to better understand population trajectories in many declining migratory animals. We believe animal tracing using sulphur isotopes will facilitate these efforts and offers manifold ecological and forensic applications in the biodiversity hotspot of sub-Saharan Africa.
(Less)
- author
- Brlík, Vojtěch
; Procházka, Petr
; Hansson, Bengt
LU
; Stricker, Craig A.
; Yohannes, Elizabeth
; Powell, Rebecca L.
and Wunder, Michael B.
- organization
- publishing date
- 2023
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- climate variability, isoscape, migration, migratory divide, remote sensing, sulphur, tracing, tracking
- in
- Journal of Animal Ecology
- volume
- 92
- issue
- 7
- pages
- 12 pages
- publisher
- Wiley-Blackwell
- external identifiers
-
- pmid:36411970
- scopus:85142743883
- ISSN
- 0021-8790
- DOI
- 10.1111/1365-2656.13848
- language
- English
- LU publication?
- yes
- id
- cb692f3a-18d7-4c1e-8a06-389101dde730
- date added to LUP
- 2023-01-24 14:43:51
- date last changed
- 2024-11-01 00:29:44
@article{cb692f3a-18d7-4c1e-8a06-389101dde730,
abstract = {{<p>Climatic conditions affect animals but range-wide impacts at the population level remain largely unknown, especially in migratory species. However, studying climate–population relationships is still challenging in small migrants due to a lack of efficient and cost-effective geographic tracking method. Spatial distribution patterns of environmental stable isotopes (so called ‘isoscapes’) generally overcome these limitations but none of the currently available isoscapes provide a substantial longitudinal gradient in species-rich sub-Saharan Africa. In this region, sulphur (δ<sup>34</sup>S) has not been sufficiently explored on a larger scale. We developed a δ<sup>34</sup>S isoscape to trace animal origins in sub-Saharan Africa by coupling known-origin samples from tracked migratory birds with continental remotely sensed environmental data building on environment–δ<sup>34</sup>S relationships using a flexible machine learning technique. Furthermore, we link population-specific nonbreeding grounds with interannual climatic variation that might translate to breeding population trends. The predicted δ<sup>34</sup>S isotopic map featured east–west and coast-to-inland isotopic gradients and was applied to predict nonbreeding grounds of three breeding populations of Eurasian Reed Warblers Acrocephalus scirpaceus with two distinct migratory phenotypes. Breeding populations as well as migratory phenotypes exhibited large-scale segregation within the African nonbreeding range. These regions also differed substantially in the interannual climatic variation, with higher interannual variability in the eastern part of the range during 2001–2012. Over the same period, the eastern European breeding population seemed to have experienced a more steep decline in population size. The link between migratory patterns and large-scale climatic variability appears important to better understand population trajectories in many declining migratory animals. We believe animal tracing using sulphur isotopes will facilitate these efforts and offers manifold ecological and forensic applications in the biodiversity hotspot of sub-Saharan Africa.</p>}},
author = {{Brlík, Vojtěch and Procházka, Petr and Hansson, Bengt and Stricker, Craig A. and Yohannes, Elizabeth and Powell, Rebecca L. and Wunder, Michael B.}},
issn = {{0021-8790}},
keywords = {{climate variability; isoscape; migration; migratory divide; remote sensing; sulphur; tracing; tracking}},
language = {{eng}},
number = {{7}},
pages = {{1320--1331}},
publisher = {{Wiley-Blackwell}},
series = {{Journal of Animal Ecology}},
title = {{Animal tracing with sulfur isotopes : Spatial segregation and climate variability in Africa likely contribute to population trends of a migratory songbird}},
url = {{http://dx.doi.org/10.1111/1365-2656.13848}},
doi = {{10.1111/1365-2656.13848}},
volume = {{92}},
year = {{2023}},
}