Underwater photogrammetry for close‐range 3D imaging of dry‐sensitive objects: The case study of cephalopod beaks

Roscian, Marjorie; Herrel, Anthony; Cornette, Raphäel; Delapré, Arnaud; Cherel, Yves; Rouget, Isabelle

doi:10.1002/ece3.7607

Cited by 3 publications

(4 citation statements)

References 61 publications

(72 reference statements)

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“…The resulting scans were segmented using Materialize Mimics (v.21.0). In all, 116 beaks housed at the Centre d'Etudes Biologiques de Chizé, France were reconstructed with the underwater photogrammetry protocol described in Roscian et al (2021). A total of 108 upper, and 101 lower beaks of adult specimens were reconstructed in three dimensions with both techniques.…”

Section: Materials Acquisitionmentioning

confidence: 99%

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Every hooked beak is maintained by a prey: Ecological signal in cephalopod beak shape

et al. 2022

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1. Beaks are among the few hard parts of coleoid cephalopods and are informative for species identification. Although mandible shape has been shown to be adaptive in many vertebrate taxa, it has been suggested that the shape of coleoid beaks does not bear any ecological signal. Yet, previous studies only explored beak shape in 2D and none have provided an in-depth investigation of the potential relationship with ecological variables such as habitat use or diet.2. The goal of the present study was to understand whether variation in cephalopod beak shape reflects ecology and/or is more driven by phylogenetic relatedness as suggested previously.3. We imaged 101 lower and 108 upper beaks in 3D using underwater photogrammetry and micro-CT scanning. Our 3D morphometric analysis conducted on 75 species of cephalopod shows that there is a significant but moderate phylogenetic signal. However, comparative phylogenetically informed analyses demonstrate that beak shape is also driven by ecology.4. We detected significant differences in beak shape between species inhabiting different habitats (pelagic, benthic or demersal) and of different trophic levels.Our results further suggest that beak shape variation can be summarized along a continuum between two main functions: fast closing versus hard biting.5. These results provide novel insights into the drivers of beak shape diversity in coleoid cephalopods and suggest that beak shape has evolved adaptively in relation to diet and habitat use.

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Section: Materials Acquisitionmentioning

confidence: 99%

“…Despite the fact that beaks are complex 3D objects, the shape of the beak has never been quantified in 3D, likely because of the complexity of acquiring the form of these objects. Composed of chitin, water and a protein complex (Miserez et al, 2008), they are difficult to image and are dry sensitive and deform easily when dehydrated (Roscian et al, 2021).…”

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confidence: 99%

Every hooked beak is maintained by a prey: Ecological signal in cephalopod beak shape

et al. 2022

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“…On the other hand, cephalopod beaks remain complex to image in three dimensions without damaging them. The use and improvement of advanced imaging technologies such as X-ray tomography and underwater photogrammetry on small objects will allow most species to be digitized (Roscian et al, 2021;Ziegler and Sagorny, 2021;Roscian et al, 2022). Nevertheless, the digitization of specimens is a long task and the accumulation and accessibility of the data to the community is a major challenge in achieving a comprehensive sampling of cephalopod 3-D model beaks.…”

Section: Future Challenges In Research In Cephalopods Beaksmentioning

confidence: 99%

The significance of cephalopod beaks as a research tool: An update

Xavier

Golikov²,

Queirós³

et al. 2022

Front. Physiol.

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The use of cephalopod beaks in ecological and population dynamics studies has allowed major advances of our knowledge on the role of cephalopods in marine ecosystems in the last 60 years. Since the 1960’s, with the pioneering research by Malcolm Clarke and colleagues, cephalopod beaks (also named jaws or mandibles) have been described to species level and their measurements have been shown to be related to cephalopod body size and mass, which permitted important information to be obtained on numerous biological and ecological aspects of cephalopods in marine ecosystems. In the last decade, a range of new techniques has been applied to cephalopod beaks, permitting new kinds of insight into cephalopod biology and ecology. The workshop on cephalopod beaks of the Cephalopod International Advisory Council Conference (Sesimbra, Portugal) in 2022 aimed to review the most recent scientific developments in this field and to identify future challenges, particularly in relation to taxonomy, age, growth, chemical composition (i.e., DNA, proteomics, stable isotopes, trace elements) and physical (i.e., structural) analyses. In terms of taxonomy, new techniques (e.g., 3D geometric morphometrics) for identifying cephalopods from their beaks are being developed with promising results, although the need for experts and reference collections of cephalopod beaks will continue. The use of beak microstructure for age and growth studies has been validated. Stable isotope analyses on beaks have proven to be an excellent technique to get valuable information on the ecology of cephalopods (namely habitat and trophic position). Trace element analyses is also possible using beaks, where concentrations are significantly lower than in other tissues (e.g., muscle, digestive gland, gills). Extracting DNA from beaks was only possible in one study so far. Protein analyses can also be made using cephalopod beaks. Future challenges in research using cephalopod beaks are also discussed.

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“…Macrophotogrammetry has already been applied in terrestrial environments to the fields of palaeontology (Roscian et al, 2021; Santella & Milner, 2017), archaeology (Marziali & Dionisio, 2017), plant science (Rose et al, 2015) and terrestrial ecology (Peterson, 2019). In these fields, resulting 3D models were shown to reach a ground resolution (i.e.…”

Section: Introductionmentioning

confidence: 99%

Underwater macrophotogrammetry to monitor in situ benthic communities at submillimetre scale

et al. 2023

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Larval settlement and recruitment of sessile organisms are key ecological processes for population recovery and maintenance that occur at scales invisible to the human eye. Accordingly, proxies of recruitment have commonly been quantified using artificial substrata such as settlement tiles made of diverse materials and shapes, which are typically transported to the laboratory for examination. However, it is unknown how much bias is introduced with this sampling strategy and how recruitment quantified on tiles relates to recruitment on nearby natural substrata. Here, we applied techniques that combine macrophotography with photogrammetry (macrophotogrammetry) underwater to monitor benthic communities at submillimetre scale. This application allows the investigation of recruitment and community succession of the earliest life‐history stages in situ and on natural substrata. We tested the use of four different imaging systems, varying in costs from US$ 1400 to US$ 5440. While the most expensive SONY αRiv system provided the best visual output and ground resolution (up to 5 μm/pixel with a + 4 close‐up lens); regardless of systems, 3D models always had a ground resolution ≤23 μm/pixel and errors in planar measurements of submillimetre features were similar among systems. This level of resolution compares well with stereomicroscopy in the range of 5:1 to 10:1 magnification, while providing detailed 3D digital records through time. Using a coral reef example, we apply this approach to demonstrate how it can be used to monitor small reef areas (~300–600 cm2) through time, including the quantification of biophysical metrics such as cover of small facilitative and competitive organisms and microhabitat complexity. We further show that organisms as small 0.5 mm in size, such as 2‐month‐old coral settlers, can be located accurately within the 3D models and measured with a good level of confidence. This method can be readily applied to other benthic environments to elucidate drivers of early recruitment and recovery of benthic organisms following disturbance impacts at very fine scales, directly on natural substrata, to avoid biases inherent with laboratory‐based analyses of artificial surfaces.

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Underwater photogrammetry for close‐range 3D imaging of dry‐sensitive objects: The case study of cephalopod beaks

Abstract: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Cited by 3 publications

References 61 publications

Every hooked beak is maintained by a prey: Ecological signal in cephalopod beak shape

Every hooked beak is maintained by a prey: Ecological signal in cephalopod beak shape

The significance of cephalopod beaks as a research tool: An update

Underwater macrophotogrammetry to monitor in situ benthic communities at submillimetre scale

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