Morphometric study of humpback whale mother-calf pairs in the Sainte Marie channel, Madagascar, using a simple drone-based photogrammetric method
International audience Morphometric studies of humpback whales (Megaptera novaeangliae) occurring in the Indian Ocean area have been limited by the technology currently available. In the Sainte Marie channel, Madagascar, straightforward aerial single-camera photogrammetry was tested on mother-calf p...
Published in: | Western Indian Ocean Journal of Marine Science |
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Online Access: | https://hal.sorbonne-universite.fr/hal-03957043 https://doi.org/10.4314/wiojms.v20i2.8 |
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ftccsdartic:oai:HAL:hal-03957043v1 2023-11-05T03:42:30+01:00 Morphometric study of humpback whale mother-calf pairs in the Sainte Marie channel, Madagascar, using a simple drone-based photogrammetric method Ratsimbazafindranahaka, Maevatiana Razafimahatratra, Emilienne Mathevet, Robin Adam, Olivier Huetz, Chloé Charrier, Isabelle Saloma, Anjara Lutheries - Acoustique - Musique (IJLRDA-LAM) Institut Jean Le Rond d'Alembert (DALEMBERT) Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) 2022-02-02 https://hal.sorbonne-universite.fr/hal-03957043 https://doi.org/10.4314/wiojms.v20i2.8 en eng HAL CCSD Western Indian Ocean Marine Science Association info:eu-repo/semantics/altIdentifier/doi/10.4314/wiojms.v20i2.8 hal-03957043 https://hal.sorbonne-universite.fr/hal-03957043 doi:10.4314/wiojms.v20i2.8 ISSN: 0856-860X Western Indian Ocean Journal of Marine Science https://hal.sorbonne-universite.fr/hal-03957043 Western Indian Ocean Journal of Marine Science, 2022, 20 (2), pp.95-107. ⟨10.4314/wiojms.v20i2.8⟩ [SDV]Life Sciences [q-bio] info:eu-repo/semantics/article Journal articles 2022 ftccsdartic https://doi.org/10.4314/wiojms.v20i2.8 2023-10-07T22:44:27Z International audience Morphometric studies of humpback whales (Megaptera novaeangliae) occurring in the Indian Ocean area have been limited by the technology currently available. In the Sainte Marie channel, Madagascar, straightforward aerial single-camera photogrammetry was tested on mother-calf pairs that combines standard Unoccupied Aerial Vehicle (UAV) with free, easy-to-access, and user-friendly software. The goals of the study were to estimate mother and calf body measurements and to investigate the effect of maternal parity (primiparous versus multiparous, based on length) on calf size. A mean length of 12.4±1.2 m for mothers (N = 16) and 5±0.9 m for calves (N = 16) was estimated. The size of calves did not depend significantly on maternal parity. The photogrammetry method used was simple and cost-effective, yet produced convincing morphometric measurements with acceptable precision and accuracy. The coefficients of variation (CVs) of repeated estimates and the level of error were relatively low (CV = 2.31 % for a known-sized object and average CV = 2.52 % for individual whales; average error = 1.8 % for a known-sized object). These results will encourage more teams to study the morphometry of large marine mammals despite limitations in terms of resources. Article in Journal/Newspaper Humpback Whale Megaptera novaeangliae Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Western Indian Ocean Journal of Marine Science 20 2 95 107 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDV]Life Sciences [q-bio] |
spellingShingle |
[SDV]Life Sciences [q-bio] Ratsimbazafindranahaka, Maevatiana Razafimahatratra, Emilienne Mathevet, Robin Adam, Olivier Huetz, Chloé Charrier, Isabelle Saloma, Anjara Morphometric study of humpback whale mother-calf pairs in the Sainte Marie channel, Madagascar, using a simple drone-based photogrammetric method |
topic_facet |
[SDV]Life Sciences [q-bio] |
description |
International audience Morphometric studies of humpback whales (Megaptera novaeangliae) occurring in the Indian Ocean area have been limited by the technology currently available. In the Sainte Marie channel, Madagascar, straightforward aerial single-camera photogrammetry was tested on mother-calf pairs that combines standard Unoccupied Aerial Vehicle (UAV) with free, easy-to-access, and user-friendly software. The goals of the study were to estimate mother and calf body measurements and to investigate the effect of maternal parity (primiparous versus multiparous, based on length) on calf size. A mean length of 12.4±1.2 m for mothers (N = 16) and 5±0.9 m for calves (N = 16) was estimated. The size of calves did not depend significantly on maternal parity. The photogrammetry method used was simple and cost-effective, yet produced convincing morphometric measurements with acceptable precision and accuracy. The coefficients of variation (CVs) of repeated estimates and the level of error were relatively low (CV = 2.31 % for a known-sized object and average CV = 2.52 % for individual whales; average error = 1.8 % for a known-sized object). These results will encourage more teams to study the morphometry of large marine mammals despite limitations in terms of resources. |
author2 |
Lutheries - Acoustique - Musique (IJLRDA-LAM) Institut Jean Le Rond d'Alembert (DALEMBERT) Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Ratsimbazafindranahaka, Maevatiana Razafimahatratra, Emilienne Mathevet, Robin Adam, Olivier Huetz, Chloé Charrier, Isabelle Saloma, Anjara |
author_facet |
Ratsimbazafindranahaka, Maevatiana Razafimahatratra, Emilienne Mathevet, Robin Adam, Olivier Huetz, Chloé Charrier, Isabelle Saloma, Anjara |
author_sort |
Ratsimbazafindranahaka, Maevatiana |
title |
Morphometric study of humpback whale mother-calf pairs in the Sainte Marie channel, Madagascar, using a simple drone-based photogrammetric method |
title_short |
Morphometric study of humpback whale mother-calf pairs in the Sainte Marie channel, Madagascar, using a simple drone-based photogrammetric method |
title_full |
Morphometric study of humpback whale mother-calf pairs in the Sainte Marie channel, Madagascar, using a simple drone-based photogrammetric method |
title_fullStr |
Morphometric study of humpback whale mother-calf pairs in the Sainte Marie channel, Madagascar, using a simple drone-based photogrammetric method |
title_full_unstemmed |
Morphometric study of humpback whale mother-calf pairs in the Sainte Marie channel, Madagascar, using a simple drone-based photogrammetric method |
title_sort |
morphometric study of humpback whale mother-calf pairs in the sainte marie channel, madagascar, using a simple drone-based photogrammetric method |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://hal.sorbonne-universite.fr/hal-03957043 https://doi.org/10.4314/wiojms.v20i2.8 |
genre |
Humpback Whale Megaptera novaeangliae |
genre_facet |
Humpback Whale Megaptera novaeangliae |
op_source |
ISSN: 0856-860X Western Indian Ocean Journal of Marine Science https://hal.sorbonne-universite.fr/hal-03957043 Western Indian Ocean Journal of Marine Science, 2022, 20 (2), pp.95-107. ⟨10.4314/wiojms.v20i2.8⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.4314/wiojms.v20i2.8 hal-03957043 https://hal.sorbonne-universite.fr/hal-03957043 doi:10.4314/wiojms.v20i2.8 |
op_doi |
https://doi.org/10.4314/wiojms.v20i2.8 |
container_title |
Western Indian Ocean Journal of Marine Science |
container_volume |
20 |
container_issue |
2 |
container_start_page |
95 |
op_container_end_page |
107 |
_version_ |
1781699677182230528 |