Analysis of the morphological variation of Doryteuthis sanpaulensis (Cephalopoda: Loliginidae) in Argentinian and Brazilian coastal waters using geometric morphometrics techniques

Braga, Ramiro; Crespi-Abril, Augusto César; Molen, Silvina Van Der; Bainy, Mara Cristiane Rodrigues Silveira; Ortíz, Nicolás

doi:10.1007/s12526-017-0661-z

Cited by 8 publications

(6 citation statements)

References 37 publications

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“…"Dynamic Stasis" in Scaphitid Ammonoids: Clues from Modern Cephalopods, Paleoecology, and Phylogeny.-Modern cephalopods are well known for exhibiting morphological plasticity (Boyle and Rodhouse 2005). This is most often related to differing environmental conditions (ecophenotypy) and/or the development of complicated population structures depending on factors such as dispersal or migration ability regulating gene flow (e.g., Boyle and Boletzky 1996;Pérez-Losada et al 2007;Zaleski et al 2012;Braga et al 2017). These features also figure prominently in the debate surrounding plausible mechanisms for speciation and morphological stasis in the fossil record (e.g., Eldredge et al 2005;Yacobucci 2016).…”

Section: Discussionmentioning

confidence: 99%

Geographic and temporal morphological stasis in the latest Cretaceous ammonoidDiscoscaphites irisfrom the U.S. Gulf and Atlantic Coastal Plains

Witts¹,

Myers²,

Garb³

et al. 2022

Paleobiology

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We examine temporal and spatial variation in morphology of the ammonoid cephalopod Discoscaphites iris using a large dataset from multiple localities in the Late Cretaceous (Maastrichtian) of the U.S. Gulf and Atlantic Coastal Plains, spanning a distance of 2000 km along the paleoshoreline. Our results suggest that the fossil record of D. iris is consistent with no within-species net accumulation of phyletic evolutionary change across morphological traits or the lifetime of this species. Correlations between some traits and paleoenvironmental conditions as well as changes in the coefficient of variation may support limited population-scale ecophenotypic plasticity; however, where stratigraphic data are available, no directional changes in morphology occur before the Cretaceous/Paleogene (K/Pg) boundary. This is consistent with models of “dynamic” evolutionary stasis. Combined with knowledge of life-history traits and paleoecology of scaphitid ammonoids, specifically a short planktonic phase after hatching followed by transition to a nektobenthic adult stage, these data suggest that scaphitids had significant potential for rapid morphological change in conjunction with limited dispersal capacity. It is therefore likely that evolutionary mode in the Scaphitidae (and potentially across the broader ammonoid clade) follows a model of cladogenesis wherein a dynamic morphological stasis is periodically interrupted by more substantial evolutionary change at speciation events. Finally, the lack of temporal changes in our data suggest that global environmental changes had a limited effect on the morphology of ammonoid faunas during the latest Cretaceous.

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Section: Discussionmentioning

confidence: 99%

Geographic and temporal morphological stasis in the latest Cretaceous ammonoidDiscoscaphites irisfrom the U.S. Gulf and Atlantic Coastal Plains

Witts¹,

Myers²,

Garb³

et al. 2022

Paleobiology

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“…Traditionally, a series of angles and linear measurements between two anatomical points would be collected and analysed using multivariate statistics. The traditional morphometrics approach has limitations, such as the loss of information by simplifying the shape and the risk of selecting dimensions that do not adequately represent the actual shape variation (Adams et al 2004;Braga et al 2017). Over the past few decades, geometric morphometrics has been developed as an alternative method.…”

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confidence: 99%

“…Despite the advantages, landmark-based geometric morphometrics has rarely been undertaken for cephalopods and was initially applied to hard structures such as cuttlebone (Neige and Boletzky 1997;Neige 2003), statoliths (Lombarte et al 2006) or more recently beaks (Fang et al 2017;Fang et al 2018). Only in recent years has geometric morphometrics been applied to study squid body shapes (Crespi-Abril et al 2010;Braga et al 2017;Schroeder et al 2017).…”

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Size-dependent change in body shape and its possible ecological role in the Patagonian squid (Doryteuthis gahi) in the Southwest Atlantic

et al. 2019

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Cephalopods are a versatile group with several mechanisms in place to ensure the success of future generations. The Patagonian long-finned squid (Doryteuthis gahi) populations on the southern Patagonian shelf are believed to be genetically homogenous but mechanisms connecting them geographically and temporally are unresolved. Individual growth is highly variable within cephalopod populations and is likely to affect individual patterns of migration and, thus, population connectivity as a whole. Therefore, this study aimed to make inferences about 2 population structure by analysing the size at which individuals were mature and aimed to describe the intrapopulation growth (allometric) trajectories of body shape, using landmark-based geometric morphometric techniques to describe phenotypes. Samples were collected from June 1999 to November 2017 around 52 o S and 58 o W. Smoothing curves from binomial generalised additive models (GAMs) suggested two size modes of maturity in females and one or multiple modes in males dependent on year and season. There was a gradual elongation of the mantle and an increase in the relative fin size throughout ontogeny. Shape scores from geometric morphometric shape coordinates revealed a continuous non-linear allometric trajectory with a significantly different slope angle for males exceeding 20.1 cm dorsal mantle length (DML). At the extreme of this continuum, the largest 'super-bull' form had a substantially more elongated body shape, a heavier fin and a larger fin area compared to the rest of the population, a body shape associated with enhanced swimming performance which may help to maintain population connectivity. The prevalence of these rare super-bulls in the fishery varied widely between years, suggestive of phenotypic plasticity. This study provides evidence that the D. gahi population on the southern Patagonian shelf has a complex population structure with high intraspecific variation. 1 Introduction Populations of animals often incidentally assume risk-spreading strategies that reduce the potential for population collapse. In many cases, a multi-generational structure provides a reserve of several year-classes of reproductively viable adults and genetic variability that reduces this risk of collapse or extinction (O'Dor 1998). Conversely, most cephalopods are characterised by short, often annual life-cycles with a complete turnover in biomass every one to two years. They therefore do not have a multi-generational structure to buffer against fluctuations in spawning and recruitment success (Pierce and Guerra 1994; Boyle and Rodhouse 2008). The flexibility inherent within many cephalopod populations may allow them to persist within the heterogeneous marine environment without a multi-generational buffer in place (O'Dor 1998). Although this is a group selectionist argument for phenotypic plasticity, it is plausible if many populations exist and population persistence depends on plasticity. Virtually every facet of cephalopod life-history examined to date has revealed an incre...

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“…The analysis of objects through landmarks allows for the effective extraction of morphological information, resulting in a greater reduction in information loss and a more complete representation of the structure's geometric shape. Furthermore, this method enables the quantification and visualization of morphology, providing a better reflection of morphological changes in species [11,12]. For example, the landmark method has been applied to differentiate Chinese mitten crabs from various water systems [13,14] and to identify morphological similarities and differences between "bathed" and original crabs [7].…”

Section: Introductionmentioning

confidence: 99%

Identification of “Bathed” Chinese Mitten Crabs (Eriocheir sinensis) Using Geometric Morphological Analysis of the Carapace

Xu,

Xue,

Liu

et al. 2023

Fishes

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To confirm whether Chinese mitten crabs (Eriocheir sinensis), commonly known as hairy crabs or river crabs, in non-Yangcheng Lake areas undergo morphological convergence with the original crabs in the Yangcheng Lake purse seine and high-standard modified aquaculture ponds after being “introduced” or “bathed”-cultured, we employed a geometric morphometrics approach. This approach allowed us to compare and analyze the dynamic changes in the carapace morphology of both the original and “introduced” crabs in Yangcheng Lake and high-standard ponds in Kunshan City at 0, 7, 14, and 30 days after “bathing” culture. The geometric morphological analysis of the carapace was conducted using a system of 35 established landmarks. The stepwise discriminant analysis of the relative distortion score revealed morphological differences between “introduced” and resident original crabs in the Yangcheng Lake area and in high-standard modified ponds after 7, 14, and 30 days of bathing culture. The accuracy of the discriminant analysis was 100%. The results of the geometric morphological visualization demonstrated that the carapaces of the bathed crabs underwent adaptive changes in the water. However, even after one month of bathing culture, the “introduced” crabs in lakes and ponds could not reach the morphological characteristics of the original crabs, i.e., their carapaces did not exhibit the characteristics of the original crabs.

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Analysis of the morphological variation of Doryteuthis sanpaulensis (Cephalopoda: Loliginidae) in Argentinian and Brazilian coastal waters using geometric morphometrics techniques

Cited by 8 publications

References 37 publications

Geographic and temporal morphological stasis in the latest Cretaceous ammonoidDiscoscaphites irisfrom the U.S. Gulf and Atlantic Coastal Plains

Geographic and temporal morphological stasis in the latest Cretaceous ammonoidDiscoscaphites irisfrom the U.S. Gulf and Atlantic Coastal Plains

Size-dependent change in body shape and its possible ecological role in the Patagonian squid (Doryteuthis gahi) in the Southwest Atlantic

Identification of “Bathed” Chinese Mitten Crabs (Eriocheir sinensis) Using Geometric Morphological Analysis of the Carapace

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