Epigenetic aging of Māui and Hector's dolphins
The age of an individual is an essential demographic parameter but is difficult to estimate without long-term monitoring or invasive sampling. Epigenetic approaches are increasingly used to age organisms, including non-model organisms such as cetaceans. Māui dolphins ( Cephalorhynchus hectori maui )...
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ftzenodo:oai:zenodo.org:10573936 2024-09-15T17:59:01+00:00 Epigenetic aging of Māui and Hector's dolphins Hernandez, Keith Baker, Scott Horvath, Steve Constantine, Rochelle 2024-01-26 https://doi.org/10.5061/dryad.hx3ffbgm3 unknown Zenodo https://doi.org/10.1002/ece3.10562 https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE242072 https://doi.org/10.5281/zenodo.8322305 https://zenodo.org/communities/dryad https://doi.org/10.5061/dryad.hx3ffbgm3 oai:zenodo.org:10573936 info:eu-repo/semantics/openAccess Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode Epigenetics DNA methylation Population dynamics Cephalorhynchus dolpins Aging Nature and Landscape Conservation Ecology Evolution Behavior and Systematics info:eu-repo/semantics/other 2024 ftzenodo https://doi.org/10.5061/dryad.hx3ffbgm310.1002/ece3.1056210.5281/zenodo.8322305 2024-07-26T23:57:26Z The age of an individual is an essential demographic parameter but is difficult to estimate without long-term monitoring or invasive sampling. Epigenetic approaches are increasingly used to age organisms, including non-model organisms such as cetaceans. Māui dolphins ( Cephalorhynchus hectori maui ) are a critically endangered subspecies endemic to Aotearoa New Zealand, and the age structure of this population is important for informing conservation. Here we present an epigenetic clock for aging Māui and Hector's dolphins ( C. h. hectori ) developed from methylation data using DNA from tooth aged individuals ( n = 48). Based on this training dataset, the optimal model required only eight methylation sites, provided an age correlation of 0.95, and had a median absolute age error of 1.54 years. A leave-one-out cross-validation analysis with the same parameters resulted in an age correlation of 0.87 and median absolute age error of 2.09 years. To improve age estimate, we included previously published beluga whale ( Delphinapterus leucas ) data to develop a joint beluga/dolphin clock, resulting in a clock with comparable performance and improved estimation of older individuals. Application of the models to DNA from skin biopsy samples of living Māui dolphins revealed a shift in the median age of 8–9 years to a younger population aged 7–8 years 10 years later. These models could be applied to other dolphin species and demonstrate the ability to construct a clock even when the number of known age samples is limited, removing this impediment to estimating demographic parameters vital to the conservation of critically endangered species. Funding provided by: Fisheries New Zealand* Crossref Funder Registry ID: Award Number: Funding provided by: Department of Conservation Crossref Funder Registry ID: https://ror.org/03mh7j916 Award Number: Funding provided by: Schlumberger (Netherlands) Crossref Funder Registry ID: https://ror.org/03daw3m97 Award Number: Other/Unknown Material Beluga Beluga whale Beluga* Delphinapterus leucas Zenodo |
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topic |
Epigenetics DNA methylation Population dynamics Cephalorhynchus dolpins Aging Nature and Landscape Conservation Ecology Evolution Behavior and Systematics |
spellingShingle |
Epigenetics DNA methylation Population dynamics Cephalorhynchus dolpins Aging Nature and Landscape Conservation Ecology Evolution Behavior and Systematics Hernandez, Keith Baker, Scott Horvath, Steve Constantine, Rochelle Epigenetic aging of Māui and Hector's dolphins |
topic_facet |
Epigenetics DNA methylation Population dynamics Cephalorhynchus dolpins Aging Nature and Landscape Conservation Ecology Evolution Behavior and Systematics |
description |
The age of an individual is an essential demographic parameter but is difficult to estimate without long-term monitoring or invasive sampling. Epigenetic approaches are increasingly used to age organisms, including non-model organisms such as cetaceans. Māui dolphins ( Cephalorhynchus hectori maui ) are a critically endangered subspecies endemic to Aotearoa New Zealand, and the age structure of this population is important for informing conservation. Here we present an epigenetic clock for aging Māui and Hector's dolphins ( C. h. hectori ) developed from methylation data using DNA from tooth aged individuals ( n = 48). Based on this training dataset, the optimal model required only eight methylation sites, provided an age correlation of 0.95, and had a median absolute age error of 1.54 years. A leave-one-out cross-validation analysis with the same parameters resulted in an age correlation of 0.87 and median absolute age error of 2.09 years. To improve age estimate, we included previously published beluga whale ( Delphinapterus leucas ) data to develop a joint beluga/dolphin clock, resulting in a clock with comparable performance and improved estimation of older individuals. Application of the models to DNA from skin biopsy samples of living Māui dolphins revealed a shift in the median age of 8–9 years to a younger population aged 7–8 years 10 years later. These models could be applied to other dolphin species and demonstrate the ability to construct a clock even when the number of known age samples is limited, removing this impediment to estimating demographic parameters vital to the conservation of critically endangered species. Funding provided by: Fisheries New Zealand* Crossref Funder Registry ID: Award Number: Funding provided by: Department of Conservation Crossref Funder Registry ID: https://ror.org/03mh7j916 Award Number: Funding provided by: Schlumberger (Netherlands) Crossref Funder Registry ID: https://ror.org/03daw3m97 Award Number: |
format |
Other/Unknown Material |
author |
Hernandez, Keith Baker, Scott Horvath, Steve Constantine, Rochelle |
author_facet |
Hernandez, Keith Baker, Scott Horvath, Steve Constantine, Rochelle |
author_sort |
Hernandez, Keith |
title |
Epigenetic aging of Māui and Hector's dolphins |
title_short |
Epigenetic aging of Māui and Hector's dolphins |
title_full |
Epigenetic aging of Māui and Hector's dolphins |
title_fullStr |
Epigenetic aging of Māui and Hector's dolphins |
title_full_unstemmed |
Epigenetic aging of Māui and Hector's dolphins |
title_sort |
epigenetic aging of māui and hector's dolphins |
publisher |
Zenodo |
publishDate |
2024 |
url |
https://doi.org/10.5061/dryad.hx3ffbgm3 |
genre |
Beluga Beluga whale Beluga* Delphinapterus leucas |
genre_facet |
Beluga Beluga whale Beluga* Delphinapterus leucas |
op_relation |
https://doi.org/10.1002/ece3.10562 https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE242072 https://doi.org/10.5281/zenodo.8322305 https://zenodo.org/communities/dryad https://doi.org/10.5061/dryad.hx3ffbgm3 oai:zenodo.org:10573936 |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode |
op_doi |
https://doi.org/10.5061/dryad.hx3ffbgm310.1002/ece3.1056210.5281/zenodo.8322305 |
_version_ |
1810435973624889344 |