Description and discrimination of sagittae otoliths of two sympatric labrisomid blennies Auchenionchus crinitus and Auchenionchus microcirrhis using morphometric analyses

Cerda, José Miguel; Palacios-Fuentes, Pámela; Díaz‐Santana‐Iturrios, Mariana; Ojeda, F. Patricio

doi:10.1016/j.seares.2021.102063

Cited by 8 publications

(6 citation statements)

References 44 publications

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“…Variations in otolith shape can also be addressed using geometric morphometrics (GM), which is adaptation of multivariate statistics and graphics for studying phenotypic variation (Schaefer and Bookstein, 2009). To date, a number of studies have demonstrated GM is an efficient tool for distinguishing among species and visualizing modifications in otolith shape allometry and asymmetry (Ponton, 2006; Mahé et al, 2019; Cerda et al, 2021). Under the GM approach, otolith shape is defined by the coordinates of numerous points (landmarks) located along its perimeter (Palmer et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Otolith shape variability of labrid fish from Rapa Nui (Easter Island), southeastern Pacific

Castro-García,

Delrieu-Trottin,

Saenz-Agudelo

et al. 2024

Preprint

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Fish otolith shape provides valuable insights into the taxonomic, phylogenetic, and ecological traits of fish species. This study aimed to assess and compare the phenotypic variation in otolith shape among four labrid species (Anampses femininus, Coris debueni, Pseudolabrus fuentesi and Thalassoma lutescens) inhabiting Rapa Nui (Easter Island) in the southeastern Pacific Ocean, utilizing geometric morphometrics and aging methods. Age estimation based on otolith structure indicated that collected specimens were adults, ranging between 1 and 3 years old. Allometric analysis revealed low but significant variation (5.40%), primarily driven by changes in otolith width, resulting in distinct morphologies. Principal Component Analysis (PCA) of sagittal otoliths elucidated significant morphospace variation among species, with the first two PCs explaining 60.3% of the total variance. PC1 distinguished between elongated sagittal shapes (e.g., P. fuentesi) and robust sagittae (e.g., T. lutescens), while PC2 correlated with otolith roundness, delineating variations within species. Canonical variate analysis further highlighted differences in otolith shape, with significant variations detected among all species. The Discriminant function analysis showed high levels of discrimination accuracy for most of species' pairs. Except for C. debueni-P. fuentesi (89%) and C. debueni-T. lutescens (96%), all other species pairs achieved 100% discrimination, highlighting the reliability of otolith shape as a distinguishing characteristic for the studied species. Overall, our findings emphasize the value of otolith shape analysis for characterizing and distinguishing Rapa Nui labrid species. This offers potential applications such as identifying prey within the digestive systems of large fish or bird predators in the vicinity of this isolated island in the South Pacific Ocean or archaeofauna studies.

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Section: Introductionmentioning

confidence: 99%

Otolith shape variability of labrid fish from Rapa Nui (Easter Island), southeastern Pacific

Castro-García,

Delrieu-Trottin,

Saenz-Agudelo

et al. 2024

Preprint

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“…Although the ecophenotype is associated with phylogenetic relatedness, common adaptive responses and the contingent behaviors remain understudied; knowledge of these factors is fundamental for organizing strategies to preserve and sustain biological diversity [7][8][9][10][11]. However, this task is particularly challenging for cryptic and extremely similar species which hardly differ based on external morphology alone, 2 of 14 and which therefore require a unified approach that uses both body morphology and otolith morphology tools [1,12]. Meanwhile, intentionally introducing species to a new habitat is a global practice that changes the biological outlook, due to factors including the success probability of these newcomers and also their influence on the niche space within the recipient community [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…As morphological relatedness is associated with ecological similarity and seems to be a proxy for its ecological role in the ecosystem, understanding the shape differences between closely related species and being able to identify them correctly are fundamental and pressing challenges for management and conservation in modern society [29,30]. The correct identification of such species requires an experienced observer, otherwise many misclassification errors occur [1,12,31]. This paper focuses on two sympatric and very similar species, C. saliens and C. auratus, to infer the ecophenotype variation underlying the genetic diversity in these species that are dispersed in the morphospace, and which therefore deserve species-specific management strategies.…”

Section: Introductionmentioning

confidence: 99%

Morphometric Analyses of Phenotypic Plasticity in Habitat Use in Two Caspian Sea Mullets

Bakhshalizadeh

Abbasi

Liafuie

et al. 2022

JMSE

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To understand the functional meaning of morphological traits in the exploitation of natural resources, it is necessary to develop a quantitative, meaningful scheme for understanding ecophenotypes; this will facilitate management and conservation, which are the most pressing challenges in vulnerable aquatic environments. In this context, the management of cryptic and very similar species is more challenging, because of the difficulty of distinguishing them and determining their frequency in sympatry, even though they do not necessarily have the same ecologies. As such, in order to understand how morphological similarities are associated with their ecology, thirteen morphometric characteristics related to body landmark-based geometric morphometries, sagittal otolith morphology, and shape were examined in mature Chelon auratus and Chelon saliens, which were collected from the coastal waters of the southwest Caspian Sea between October 2020 and April 2021. Univariate and multivariate analysis of variance were conducted to evaluate the potential morphological differences between the species. The analyses highlight the morphological differences between C. auratus and C. saliens, and identify potentially helpful traits for using body and otolith shape for the interspecific distinction of these very similar species of Caspian mullet, which can reflect functional similarity and are an important component of community ecology.

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“…These tools allow one to quantitatively assess the shape of the fish body and/or its hard structures (Bookstein, 1991;Zelditch et al, 2004). In fish taxonomy, geometric morphometrics have been widely used to corroborate taxonomic entities based on otolith shape (Cerda et al, 2021;Chollet-Villalpando et al, 2019;Ponton, 2006).…”

Section: Introductionmentioning

confidence: 99%

“…These tools allow one to quantitatively assess the shape of the fish body and/or its hard structures (Bookstein, 1991; Zelditch et al ., 2004). In fish taxonomy, geometric morphometrics have been widely used to corroborate taxonomic entities based on otolith shape (Cerda et al ., 2021; Chollet‐Villalpando et al ., 2019; Ponton, 2006). Nonetheless, thorough taxon‐specific otolith shape descriptions are uncommon, and much less common or even non‐existing are dichotomous identification keys endorsed with this methodological approach.…”

Section: Introductionmentioning

confidence: 99%

Lapillusotolith shape, a useful taxonomic feature for the identification of sea catfishes (Ariidae: Siluriformes) from the north‐eastern Pacific

Arroyo‐Zúñiga

Pacheco‐Ovando

Granados-Amores

et al. 2022

Journal of Fish Biology

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Otolith shape is widely used as a taxonomic feature in fish systematics.In Siluriformes, the lapillus otolith is the most relevant character for taxonomic purposes, although its discriminant potential has not been assessed quantitatively. Our study model were sea catfishes of the family Ariidae from the north-eastern Pacific as representatives of Siluriformes, a taxon with increased taxonomic complexity. The lapillus otolith shape obtained by geometric morphometrics showed high discrimination potential both at the genus and species levels with an overall classification accuracy of c. 93% (K = 0.92). Due to the strong species delimitation exhibited by lapillus otolith shape, the descriptions and identification keys provided here are the most useful materials to recognize the eight sea catfish species evaluated. The shared similarities in lapillus otolith shape among species seem to be more influenced by phylogenetic relationships than other factors such as habitat. The lapillus otolith shape is the most powerful taxonomic feature discovered so far for the identification of sea catfishes from the north-eastern Pacific.

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Description and discrimination of sagittae otoliths of two sympatric labrisomid blennies Auchenionchus crinitus and Auchenionchus microcirrhis using morphometric analyses

Cited by 8 publications

References 44 publications

Otolith shape variability of labrid fish from Rapa Nui (Easter Island), southeastern Pacific

Otolith shape variability of labrid fish from Rapa Nui (Easter Island), southeastern Pacific

Morphometric Analyses of Phenotypic Plasticity in Habitat Use in Two Caspian Sea Mullets

Lapillusotolith shape, a useful taxonomic feature for the identification of sea catfishes (Ariidae: Siluriformes) from the north‐eastern Pacific

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