Data_Sheet_1_Origin and Persistence of Markings in a Long-Term Photo-Identification Dataset Reveal the Threat of Entanglement for Endangered Northern Bottlenose Whales (Hyperoodon ampullatus).pdf
Photo-identification methods depend on markings that are stable over time. Using a large dataset of photographs taken over a 31-year period, we evaluate the reliability, rate of change and demographic trends in different mark types on northern bottlenose whales (Hyperoodon ampullatus) in the Endange...
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Online Access: | https://doi.org/10.3389/fmars.2021.620804.s001 https://figshare.com/articles/dataset/Data_Sheet_1_Origin_and_Persistence_of_Markings_in_a_Long-Term_Photo-Identification_Dataset_Reveal_the_Threat_of_Entanglement_for_Endangered_Northern_Bottlenose_Whales_Hyperoodon_ampullatus_pdf/14539419 |
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ftfrontimediafig:oai:figshare.com:article/14539419 2023-05-15T16:36:26+02:00 Data_Sheet_1_Origin and Persistence of Markings in a Long-Term Photo-Identification Dataset Reveal the Threat of Entanglement for Endangered Northern Bottlenose Whales (Hyperoodon ampullatus).pdf Laura Joan Feyrer Madison Stewart Jas Yeung Colette Soulier Hal Whitehead 2021-05-05T04:36:43Z https://doi.org/10.3389/fmars.2021.620804.s001 https://figshare.com/articles/dataset/Data_Sheet_1_Origin_and_Persistence_of_Markings_in_a_Long-Term_Photo-Identification_Dataset_Reveal_the_Threat_of_Entanglement_for_Endangered_Northern_Bottlenose_Whales_Hyperoodon_ampullatus_pdf/14539419 unknown doi:10.3389/fmars.2021.620804.s001 https://figshare.com/articles/dataset/Data_Sheet_1_Origin_and_Persistence_of_Markings_in_a_Long-Term_Photo-Identification_Dataset_Reveal_the_Threat_of_Entanglement_for_Endangered_Northern_Bottlenose_Whales_Hyperoodon_ampullatus_pdf/14539419 CC BY 4.0 CC-BY Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering beaked whale fisheries bycatch endangered species marine protected area vessel strikes potential biological removal (PBR) Dataset 2021 ftfrontimediafig https://doi.org/10.3389/fmars.2021.620804.s001 2021-05-05T22:57:19Z Photo-identification methods depend on markings that are stable over time. Using a large dataset of photographs taken over a 31-year period, we evaluate the reliability, rate of change and demographic trends in different mark types on northern bottlenose whales (Hyperoodon ampullatus) in the Endangered Scotian Shelf population, and assess the prevalence and severity of anthropogenically caused markings. Only fin notches and back indentations were stable over long timescales, leading to 48% of the overall population being assessed as reliably marked. Males and mature males were found to have higher incidence of most mark types compared to females and juveniles. The proportion of reliably marked individuals increased over time, a trend that should be accounted for in any temporal analysis of population size using mark-recapture methods. An overall increase in marked individuals may reflect the accumulation of scars on an aging population post whaling. Anthropogenic markings, including probable entanglement and propeller-vessel strike scars, occurred at a steady rate over the study period and were observed on 6.6% of the population. The annual gain rate for all injuries associated with anthropogenic interactions was over 5 times the annual potential biological removal (PBR) calculated for the endangered population. As entanglement incidents and propeller-vessel strike injuries are typically undetected in offshore areas, we provide the first minimum estimate of harmful human interactions for northern bottlenose whales. With low observer effort for fisheries across the Canadian Atlantic, photo-identification offers an important line of evidence of the risks faced by this Endangered whale population. Dataset hyperoodon ampullatus Frontiers: Figshare |
institution |
Open Polar |
collection |
Frontiers: Figshare |
op_collection_id |
ftfrontimediafig |
language |
unknown |
topic |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering beaked whale fisheries bycatch endangered species marine protected area vessel strikes potential biological removal (PBR) |
spellingShingle |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering beaked whale fisheries bycatch endangered species marine protected area vessel strikes potential biological removal (PBR) Laura Joan Feyrer Madison Stewart Jas Yeung Colette Soulier Hal Whitehead Data_Sheet_1_Origin and Persistence of Markings in a Long-Term Photo-Identification Dataset Reveal the Threat of Entanglement for Endangered Northern Bottlenose Whales (Hyperoodon ampullatus).pdf |
topic_facet |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering beaked whale fisheries bycatch endangered species marine protected area vessel strikes potential biological removal (PBR) |
description |
Photo-identification methods depend on markings that are stable over time. Using a large dataset of photographs taken over a 31-year period, we evaluate the reliability, rate of change and demographic trends in different mark types on northern bottlenose whales (Hyperoodon ampullatus) in the Endangered Scotian Shelf population, and assess the prevalence and severity of anthropogenically caused markings. Only fin notches and back indentations were stable over long timescales, leading to 48% of the overall population being assessed as reliably marked. Males and mature males were found to have higher incidence of most mark types compared to females and juveniles. The proportion of reliably marked individuals increased over time, a trend that should be accounted for in any temporal analysis of population size using mark-recapture methods. An overall increase in marked individuals may reflect the accumulation of scars on an aging population post whaling. Anthropogenic markings, including probable entanglement and propeller-vessel strike scars, occurred at a steady rate over the study period and were observed on 6.6% of the population. The annual gain rate for all injuries associated with anthropogenic interactions was over 5 times the annual potential biological removal (PBR) calculated for the endangered population. As entanglement incidents and propeller-vessel strike injuries are typically undetected in offshore areas, we provide the first minimum estimate of harmful human interactions for northern bottlenose whales. With low observer effort for fisheries across the Canadian Atlantic, photo-identification offers an important line of evidence of the risks faced by this Endangered whale population. |
format |
Dataset |
author |
Laura Joan Feyrer Madison Stewart Jas Yeung Colette Soulier Hal Whitehead |
author_facet |
Laura Joan Feyrer Madison Stewart Jas Yeung Colette Soulier Hal Whitehead |
author_sort |
Laura Joan Feyrer |
title |
Data_Sheet_1_Origin and Persistence of Markings in a Long-Term Photo-Identification Dataset Reveal the Threat of Entanglement for Endangered Northern Bottlenose Whales (Hyperoodon ampullatus).pdf |
title_short |
Data_Sheet_1_Origin and Persistence of Markings in a Long-Term Photo-Identification Dataset Reveal the Threat of Entanglement for Endangered Northern Bottlenose Whales (Hyperoodon ampullatus).pdf |
title_full |
Data_Sheet_1_Origin and Persistence of Markings in a Long-Term Photo-Identification Dataset Reveal the Threat of Entanglement for Endangered Northern Bottlenose Whales (Hyperoodon ampullatus).pdf |
title_fullStr |
Data_Sheet_1_Origin and Persistence of Markings in a Long-Term Photo-Identification Dataset Reveal the Threat of Entanglement for Endangered Northern Bottlenose Whales (Hyperoodon ampullatus).pdf |
title_full_unstemmed |
Data_Sheet_1_Origin and Persistence of Markings in a Long-Term Photo-Identification Dataset Reveal the Threat of Entanglement for Endangered Northern Bottlenose Whales (Hyperoodon ampullatus).pdf |
title_sort |
data_sheet_1_origin and persistence of markings in a long-term photo-identification dataset reveal the threat of entanglement for endangered northern bottlenose whales (hyperoodon ampullatus).pdf |
publishDate |
2021 |
url |
https://doi.org/10.3389/fmars.2021.620804.s001 https://figshare.com/articles/dataset/Data_Sheet_1_Origin_and_Persistence_of_Markings_in_a_Long-Term_Photo-Identification_Dataset_Reveal_the_Threat_of_Entanglement_for_Endangered_Northern_Bottlenose_Whales_Hyperoodon_ampullatus_pdf/14539419 |
genre |
hyperoodon ampullatus |
genre_facet |
hyperoodon ampullatus |
op_relation |
doi:10.3389/fmars.2021.620804.s001 https://figshare.com/articles/dataset/Data_Sheet_1_Origin_and_Persistence_of_Markings_in_a_Long-Term_Photo-Identification_Dataset_Reveal_the_Threat_of_Entanglement_for_Endangered_Northern_Bottlenose_Whales_Hyperoodon_ampullatus_pdf/14539419 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3389/fmars.2021.620804.s001 |
_version_ |
1766026779676377088 |