Advancing interpretation of stable isotope assignment maps: comparing and summarizing origins of known-provenance migratory bats

Probability-of-origin maps deduced from stable isotope data are important for inferring broad-scale patterns of animal migration, but few resources and tools for interpreting and validating these maps exist. For example, quantitative tools for comparing multiple probability-of-origin maps do not exi...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Campbell Caitlin J., Fitzpatrick Matthew C., Vander Zanden Hannah B., Nelson David M.
Formato:	article
Lenguaje:	EN
Publicado:	De Gruyter 2020
Materias:	isoscape geographic assignment spatial similarity isocat Biology (General) QH301-705.5
Acceso en línea:	https://doaj.org/article/4794835b50c946bb9b195d39ba597748
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:4794835b50c946bb9b195d39ba597748
record_format	dspace
spelling	oai:doaj.org-article:4794835b50c946bb9b195d39ba5977482021-12-02T19:11:09ZAdvancing interpretation of stable isotope assignment maps: comparing and summarizing origins of known-provenance migratory bats2084-883810.1515/ami-2020-0004https://doaj.org/article/4794835b50c946bb9b195d39ba5977482020-06-01T00:00:00Zhttps://doi.org/10.1515/ami-2020-0004https://doaj.org/toc/2084-8838Probability-of-origin maps deduced from stable isotope data are important for inferring broad-scale patterns of animal migration, but few resources and tools for interpreting and validating these maps exist. For example, quantitative tools for comparing multiple probability-of-origin maps do not exist, and many existing approaches for geographic assignment of individuals have not been validated or compared with respect to precision and accuracy. To address these challenges, we created and analyzed probability-of-origin maps using stable hydrogen isotope values from known-origin individuals of three species of migratory bat. We used a metric of spatial overlap to group individuals by areas of origin without a priori knowledge of such regions. The metric of spatial similarity allowed for quantitative comparison of geographic origins and grouping of individuals with similar origins. We then compared four approaches for inferring origins (cumulative-sum, odds-ratio, quantile-only, and quantile-simulation) across a range of thresholds and probable minimum distance traveled. The accuracy of geographic origins and minimum distance traveled varied across species at most threshold values for most approaches. The cumulative-sum and quantile-simulation approaches had generally higher precision at a given level of accuracy than the odds-ratio and quantile-only approaches, and many threshold values were associated with a relatively high degree (> 300 km) of variation in minimum distance traveled. Overall, these results reinforce the importance of validating assignment techniques with known-origin individuals when possible. We present the tools discussed as part of an R package, ‘isocat’ (“Isotope Origin Clustering and Assignment Tools”).Campbell Caitlin J.Fitzpatrick Matthew C.Vander Zanden Hannah B.Nelson David M.De Gruyterarticleisoscapegeographic assignmentspatial similarityisocatBiology (General)QH301-705.5ENAnimal Migration, Vol 7, Iss 1, Pp 27-41 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	isoscape geographic assignment spatial similarity isocat Biology (General) QH301-705.5
spellingShingle	isoscape geographic assignment spatial similarity isocat Biology (General) QH301-705.5 Campbell Caitlin J. Fitzpatrick Matthew C. Vander Zanden Hannah B. Nelson David M. Advancing interpretation of stable isotope assignment maps: comparing and summarizing origins of known-provenance migratory bats
description	Probability-of-origin maps deduced from stable isotope data are important for inferring broad-scale patterns of animal migration, but few resources and tools for interpreting and validating these maps exist. For example, quantitative tools for comparing multiple probability-of-origin maps do not exist, and many existing approaches for geographic assignment of individuals have not been validated or compared with respect to precision and accuracy. To address these challenges, we created and analyzed probability-of-origin maps using stable hydrogen isotope values from known-origin individuals of three species of migratory bat. We used a metric of spatial overlap to group individuals by areas of origin without a priori knowledge of such regions. The metric of spatial similarity allowed for quantitative comparison of geographic origins and grouping of individuals with similar origins. We then compared four approaches for inferring origins (cumulative-sum, odds-ratio, quantile-only, and quantile-simulation) across a range of thresholds and probable minimum distance traveled. The accuracy of geographic origins and minimum distance traveled varied across species at most threshold values for most approaches. The cumulative-sum and quantile-simulation approaches had generally higher precision at a given level of accuracy than the odds-ratio and quantile-only approaches, and many threshold values were associated with a relatively high degree (> 300 km) of variation in minimum distance traveled. Overall, these results reinforce the importance of validating assignment techniques with known-origin individuals when possible. We present the tools discussed as part of an R package, ‘isocat’ (“Isotope Origin Clustering and Assignment Tools”).
format	article
author	Campbell Caitlin J. Fitzpatrick Matthew C. Vander Zanden Hannah B. Nelson David M.
author_facet	Campbell Caitlin J. Fitzpatrick Matthew C. Vander Zanden Hannah B. Nelson David M.
author_sort	Campbell Caitlin J.
title	Advancing interpretation of stable isotope assignment maps: comparing and summarizing origins of known-provenance migratory bats
title_short	Advancing interpretation of stable isotope assignment maps: comparing and summarizing origins of known-provenance migratory bats
title_full	Advancing interpretation of stable isotope assignment maps: comparing and summarizing origins of known-provenance migratory bats
title_fullStr	Advancing interpretation of stable isotope assignment maps: comparing and summarizing origins of known-provenance migratory bats
title_full_unstemmed	Advancing interpretation of stable isotope assignment maps: comparing and summarizing origins of known-provenance migratory bats
title_sort	advancing interpretation of stable isotope assignment maps: comparing and summarizing origins of known-provenance migratory bats
publisher	De Gruyter
publishDate	2020
url	https://doaj.org/article/4794835b50c946bb9b195d39ba597748
work_keys_str_mv	AT campbellcaitlinj advancinginterpretationofstableisotopeassignmentmapscomparingandsummarizingoriginsofknownprovenancemigratorybats AT fitzpatrickmatthewc advancinginterpretationofstableisotopeassignmentmapscomparingandsummarizingoriginsofknownprovenancemigratorybats AT vanderzandenhannahb advancinginterpretationofstableisotopeassignmentmapscomparingandsummarizingoriginsofknownprovenancemigratorybats AT nelsondavidm advancinginterpretationofstableisotopeassignmentmapscomparingandsummarizingoriginsofknownprovenancemigratorybats
_version_	1718377083093123072

Advancing interpretation of stable isotope assignment maps: comparing and summarizing origins of known-provenance migratory bats

Ejemplares similares