[MARMAM] New publication: Aerial photogrammetry techniques using drones to estimate morphometric measurements and body condition in South American small cetaceans

Lucas Lima oceano2014lucas at gmail.com
Wed Mar 22 13:29:07 PDT 2023


Dear MARMAM community,



My co-authors and I are pleased to inform you about a new publication
titled “Aerial photogrammetry techniques using drones to estimate
morphometric measurements and body condition in South American small
cetaceans” recently published in Marine Mammal Science.



*de Oliveira, L. L., Andriolo, A., Cremer, M. J., & Zerbini, A.
N. (2023). Aerial photogrammetry techniques using drones to estimate
morphometric measurements and body condition in South American small
cetaceans. Marine Mammal Science, 1– 19. https://doi.org/10.1111/mms.13011
<https://doi.org/10.1111/mms.13011>*



Abstract

 Aerial photogrammetry protocols using drones have proved efficient in
monitoring free-living cetaceans. In this work an aerial photogrammetry
protocol using a drone was applied to estimate morphometric measurements
and body condition variation in two endangered cetacean species,
franciscanas (Pontoporia blainvillei, n = 122) and Guiana dolphin (Sotalia
guianensis, n = 41). Sampling occurred in winter and summer in Babitonga
Bay, southern Brazil. A 115 cm length object was used to calibrate the
scale of measurements at different altitudes. A scale calibration model
based on eGSD regression by flight altitude was developed (RMSE = 0.039, r
2 = 0.9902, ΔAICc = 0.00) and used to convert measurements from pixels to
centimeters. Five morphometric measurements (body length - BL, widths at
anterior pectoral fin - AP, axilla - AX, anterior dorsal fin - AD, and
posterior dorsal fin - PD) were taken from each animal to infer body
condition, in which, the widths in the anterior portions of the body as %
BL, can be an auxiliary tool in the evaluation of variation in the body
condition of the small cetaceans studied. The aerial photogrammetry
protocol allowed for estimating morphometric measurements and monitoring
seasonal changes in the body condition of the small cetaceans.


KEYWORDS aerial photogrammetry, body condition, drone, morphometric
measurements, Pontoporia blainvillei, Sotalia guianensis, UAV



The paper can be accessed via the publisher website: https://doi.org/
10.1111/mms.13011

Or via Shareable link (read-only):
https://onlinelibrary.wiley.com/share/author/DJ4BIE6MQZ98GT9B7VFF?target=10.1111/mms.13011



Please feel free to contact us if you have any questions.



Best regards,

Lucas Lima de Oliveira

-- 

*Lucas Lima de Oliveira*

Bacharel em Oceanografia pela Universidade Federal do Ceará - UFC.

Mestre em Biodiversidade e Conservação da Natureza pela Universidade
Federal de Juiz de Fora - UFJF.

Pesquisador no Instituto Aqualie - IA.
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