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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Language: | English |
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2022
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Online Access: | https://hal.science/hal-03618470 https://hal.science/hal-03618470/document https://hal.science/hal-03618470/file/WIOMSA_Morpho_2022.pdf https://doi.org/10.4314/wiojms.v20i2.8 |
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ftuniparissaclay:oai:HAL:hal-03618470v1 2024-01-07T09:43:48+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 T. Saloma, Anjara Département de Zoologie et Biodiversité Animale, Université d'Antananarivo Institut des Neurosciences Paris-Saclay (NeuroPSI) Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) Conception et fabrication de drones (CU SAS) Institut Jean Le Rond d'Alembert (DALEMBERT) Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Cetamada Madagascar 2022-02-02 https://hal.science/hal-03618470 https://hal.science/hal-03618470/document https://hal.science/hal-03618470/file/WIOMSA_Morpho_2022.pdf 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-03618470 https://hal.science/hal-03618470 https://hal.science/hal-03618470/document https://hal.science/hal-03618470/file/WIOMSA_Morpho_2022.pdf doi:10.4314/wiojms.v20i2.8 info:eu-repo/semantics/OpenAccess ISSN: 0856-860X Western Indian Ocean Journal of Marine Science https://hal.science/hal-03618470 Western Indian Ocean Journal of Marine Science, 2022, 20 (2), pp.95-107. ⟨10.4314/wiojms.v20i2.8⟩ [SDV.NEU.NB]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]/Neurobiology [SDV.NEU.PC]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]/Psychology and behavior [SDV.NEU.SC]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]/Cognitive Sciences info:eu-repo/semantics/article Journal articles 2022 ftuniparissaclay https://doi.org/10.4314/wiojms.v20i2.8 2023-12-09T22:30:59Z 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 Archives ouvertes de Paris-Saclay Indian Western Indian Ocean Journal of Marine Science 20 2 95 107 |
institution |
Open Polar |
collection |
Archives ouvertes de Paris-Saclay |
op_collection_id |
ftuniparissaclay |
language |
English |
topic |
[SDV.NEU.NB]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]/Neurobiology [SDV.NEU.PC]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]/Psychology and behavior [SDV.NEU.SC]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]/Cognitive Sciences |
spellingShingle |
[SDV.NEU.NB]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]/Neurobiology [SDV.NEU.PC]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]/Psychology and behavior [SDV.NEU.SC]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]/Cognitive Sciences Ratsimbazafindranahaka, Maevatiana Razafimahatratra, Emilienne Mathevet, Robin Adam, Olivier Huetz, Chloé Charrier, Isabelle T. 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.NEU.NB]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]/Neurobiology [SDV.NEU.PC]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]/Psychology and behavior [SDV.NEU.SC]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]/Cognitive Sciences |
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 |
Département de Zoologie et Biodiversité Animale, Université d'Antananarivo Institut des Neurosciences Paris-Saclay (NeuroPSI) Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) Conception et fabrication de drones (CU SAS) Institut Jean Le Rond d'Alembert (DALEMBERT) Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Cetamada Madagascar |
format |
Article in Journal/Newspaper |
author |
Ratsimbazafindranahaka, Maevatiana Razafimahatratra, Emilienne Mathevet, Robin Adam, Olivier Huetz, Chloé Charrier, Isabelle T. Saloma, Anjara |
author_facet |
Ratsimbazafindranahaka, Maevatiana Razafimahatratra, Emilienne Mathevet, Robin Adam, Olivier Huetz, Chloé Charrier, Isabelle T. 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.science/hal-03618470 https://hal.science/hal-03618470/document https://hal.science/hal-03618470/file/WIOMSA_Morpho_2022.pdf https://doi.org/10.4314/wiojms.v20i2.8 |
geographic |
Indian |
geographic_facet |
Indian |
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.science/hal-03618470 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-03618470 https://hal.science/hal-03618470 https://hal.science/hal-03618470/document https://hal.science/hal-03618470/file/WIOMSA_Morpho_2022.pdf doi:10.4314/wiojms.v20i2.8 |
op_rights |
info:eu-repo/semantics/OpenAccess |
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 |
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1787425088597917696 |