Beak shape analysis and its potential to recognize three loliginid squid species found in the northeastern Pacific

Pacheco‐Ovando, Renata; Granados‐Amores, Jasmín; González-Salinas, Benjamín; Ruiz-Villegas, Juan Mario; Díaz‐Santana‐Iturrios, Mariana

doi:10.1007/s12526-021-01220-w

Cited by 4 publications

(9 citation statements)

References 29 publications

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“…Specifically, Fernández-Álvarez et al (2020) studied impacts of developmental malformations of the buccal mass on the trophic position of Eledone cirrhosa and found that the habitat and the trophic position were not significantly affected by the malformations. Other authors found significant differences in the beak shapes of pelagic and benthic species in relation to their trophic levels (Roscian et al, 2022), between species living in coastal and oceanic habitats (Pacheco-Ovando et al, 2021) and between species/populations living in different feeding habitats (Pacheco-Ovando et al, 2021). New phylogenomic techniques applied to cephalopods (Anderson and Lindgren, 2021;Sanchez et al, 2021;Fernández-Álvarez et al, 2022) may help to assess which morphological characters of the beaks are determined by phylogeny and which are explained by other drivers.…”

Section: Taxonomy and Beak Morphologymentioning

confidence: 99%

“…Despite these limitations, the potential of these approaches is substantial, supported by the results of recent studies. Most commonly, geometric morphometrics methods were successfully applied for taxonomic classification, species identification or stocks (Neige and Dommergues, 2002;Crespi-Abril et al, 2010;Tanabe et al, 2015b;Fang et al, 2017;Jin et al, 2017;Fang et al, 2018;Pacheco-Ovando et al, 2021;Díaz-Santana-Iturrios et al, 2022). At the beginning of the millennium, the application of these approaches to a wide diversity of species was scarce (Neige and Dommergues, 2002;Tanabe et al, 2015b) and provided limited resolution of identification.…”

Section: Taxonomy and Beak Morphologymentioning

confidence: 99%

“…However, in the last decade, geometric morphometric methods began to flourish. Different authors applied either 2D landmark-based methods (Fang et al, 2017;Fang et al, 2018;Pacheco-Ovando et al, 2021;Díaz-Santana-Iturrios et al, 2022) or outline-based methods (Jin et al, 2017). Both approaches showed high level of identification accuracy, up to 100% in classification of the genera (Pacheco-Ovando et al, 2021), up to 93% in species identification (Fang et al, 2018), and up to 70% correct classifications of stock units (Fang et al, 2017).…”

Section: Taxonomy and Beak Morphologymentioning

confidence: 99%

“…Several studies revealed the potential of beak shape analysis in ecological studies (Fernández-Álvarez et al, 2020;Pacheco-Ovando et al, 2021;Roscian et al, 2022). Specifically, Fernández-Álvarez et al (2020) studied impacts of developmental malformations of the buccal mass on the trophic position of Eledone cirrhosa and found that the habitat and the trophic position were not significantly affected by the malformations.…”

Section: Taxonomy and Beak Morphologymentioning

confidence: 99%

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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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Section: Taxonomy and Beak Morphologymentioning

confidence: 99%

Section: Taxonomy and Beak Morphologymentioning

confidence: 99%

Section: Taxonomy and Beak Morphologymentioning

confidence: 99%

Section: Taxonomy and Beak Morphologymentioning

confidence: 99%

See 2 more Smart Citations

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

Xavier

Golikov²,

Queirós³

et al. 2022

Front. Physiol.

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show abstract

“…The hard structures such as beaks of cephalopods have been studied by many marine biology researchers since the 1960s because of their stable configuration and their potential to provide valuable ecological information (Clarke, 1962; Tan et al, 2015; Xavier et al, 2022). The beak of a cephalopod is the most important feeding organ and has been used for identification at the species and population levels (Fang et al, 2018; Fang et al, 2021; Pacheco‐Ovando et al, 2021; Xavier et al, 2011). Sánchez‐Márquez et al (2022) demonstrated that phylogenetic relatedness showed a significant impact on the beak shape of 18 cephalopods sampled from the western Mediterranean Sea.…”

Section: Introductionmentioning

confidence: 99%

Geometric morphometrics casts light on phylogenetic relevance of cephalopod beak morphological

Wang,

Chen,

Fang

2024

Journal of Morphology

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The feeding organ of cephalopod species, the beak, can be used to reveal important ecological information. In this study, geometric morphometric approaches were employed to investigate the phylogenetic relevance and classification effect of beak lateral profile shape. The two‐dimensional beak morphologies of 1164 pairs of 24 species from 13 genera and five families were constructed, and their evolutionary relationships and taxonomic status were confirmed using geometric morphometrics and molecular biology approaches. We also assessed the phylogenetic signals of beak shape. The analysis results show shape variation in the beak mainly in the rostrum, hood, and lateral wall. The overall shape parameters (all PCs) of the upper and lower beak are more useful for species identification. The shapes of the upper and lower beak show a strong phylogenetic signal, and the phenogram based on the beak shape basically reflected the families’ taxonomic positions. We also hypothesized that the shape variation in the beaks of cephalopods may be ascribed to genetic and environmental differences. In summary, beaks are a reliable material for the classification of cephalopod species. Geometric morphometric approaches are a powerful tool to reveal the identification, phylogenetic relevance and phenotypic diversity of beak shape in cephalopods.

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Ontogenetic Variation and Sexual Dimorphism of Beaks among Four Cephalopod Species Based on Geometric Morphometrics

Wang

Fang

2023

Animals

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Investigating the ontogenetic variation of biological individuals helps us to fully understand the characteristics of evolution. In order to explore the ontogenetic variation and sexual dimorphism of the beak shape in Octopus minor, Uroteuthis edulis, Sepia esculenta and Sthenoteuthis oualaniensis of the China’s coastal waters, the differences between immature and mature stages and the sex-linked differences in the beak shape and size were analyzed with geometric morphometrics methods in this study. The results of Procrustes analysis of variance, principal component analysis and multivariate regression showed that the shapes of the upper beaks of O. minor, U. edulis and S. esculenta differed significantly among various ontogenetic stages (p < 0.05). The shapes of the lower beaks of U. edulis, S. esculenta and Sthenoteuthis oualaniensis were also significantly different among various ontogenetic stages (p < 0.05). The results of thin-plate spline deformation grids showed that the beaks of the four cephalopod species presented different variation patterns. This study gives us basic beak geometry morphology information for Octopus minor, Uroteuthis edulis, Sepia esculenta and Sthenoteuthis oualaniensis present in China’s coastal waters. The ontogenetic differences in beak shape might be related to extrinsic factors (diet difference and intra and interspecific competition) in habitat.

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Beak shape analysis and its potential to recognize three loliginid squid species found in the northeastern Pacific

Cited by 4 publications

References 29 publications

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

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

Geometric morphometrics casts light on phylogenetic relevance of cephalopod beak morphological

Ontogenetic Variation and Sexual Dimorphism of Beaks among Four Cephalopod Species Based on Geometric Morphometrics

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