Morphometric homogeneity and allometric growth of Potamon fluviatile in Italy

Scalici, Massimiliano; Goretti, Enzo; Dörr, Ambrosius Josef Martin; D’Allestro, V.

doi:10.1163/15685403-00003234

Cited by 6 publications

(2 citation statements)

References 14 publications

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“…Some studies carried out using geometric morphometry in crabs have aimed to ascertain variations in the shape of specimens considering the differentiation between populations from different locations (Trevisan & Masunari 2010, Scalici et al 2013, Deli et al 2015, Pramithasari et al 2017) in order to differentiate individuals with regard to sexual dimorphism (Alencar et al 2014, Marochi et al 2016, as well as variations in ontogenetic trajectory (Shinozaki-Mendes & Lessa 2017), which consists of variations associated with growth processes. For the species Goyazana castelnaui, only the study by Silva et al (2018) has used geometric morphometry to identify the existence of sexual and age dimorphism for sexed young and adult individuals.…”

Section: Introductionmentioning

confidence: 99%

Ontogenetic variation of the Goyazana castelnaui H. Milne-Edwards, 1853 (Brachyura, Trichodactylidae), crab in the semiarid region of Brazil

ALMEIDA,

MENEZES,

SHINOZAKI-MENDES

2023

An. Acad. Bras. Ciênc.

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In order to know the morphological variations of Goyazana castelnaui, we conducted an ontogenetic study from the first crab stage to the adult stage using geometric morphometry. We studied 36 females, 43 males and 162 juveniles collected in the Pajeú River, Brazil. We photographed crabs' carapace, pleon and right cheliped with they arranged parallel to the plane, afterwards landmarks and semi-landmarks were strategically distributed in the images. Through principal components analysis, we observed that the variation occurred mainly in the frontal and posterior region of the carapace. The pleon presented marked variations in the posterior and anterolateral region, while chelipeds presented greater variations at the base of the fixed finger.The canonical variation between sexes and between juveniles and adults (p<0.05) varied significantly. Correct allocations obtained by discriminant analysis (p<0.05) varied between 89.3% and 100.0%. The carapace shows a constant dimorphism along the ontogenetic trajectory, and both sexes reach similar centroid sizes (p>0.05). While the pleon and the cheliped, both sexes are similar when juvenile, diverging along the trajectory and reaching different centroid sizes (p<0.05). Females have a larger pleon and males a larger cheliped, corroborating the monophyletic theory of Brachyura.

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Section: Introductionmentioning

confidence: 99%

Ontogenetic variation of the Goyazana castelnaui H. Milne-Edwards, 1853 (Brachyura, Trichodactylidae), crab in the semiarid region of Brazil

ALMEIDA,

MENEZES,

SHINOZAKI-MENDES

2023

An. Acad. Bras. Ciênc.

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“…P. fluviatile is distributed across Italy, Malta, Croatia, southern Dalmatia, Albania and Greece (Brandis et al 2000), usually segregated from other autochthonous macro-decapods (Barbaresi et al 2007;Mazza et al 2017). Adults may reach a carapace length of about 50 mm over a 10-year-long lifespan (Gherardi et al 1987;Micheli et al 1990;Scalici et al 2013); they are omnivorous, feeding primarily on invertebrates, amphibians and macrophytes (Cumberlidge 2008). Since 2008, P. fluviatile has been assessed as "Near threatened" on the International Union for Conservation of Nature (IUCN) Red List of Threatened Species (http:// www.iucnredlist.org/details/134293/0), because the populations of the species historically declined as a result of pollution, over-harvesting and mismanagement of habitats (Matthew & Reynolds 1995;Gherardi & Holdich 1999).…”

Section: Introductionmentioning

confidence: 99%

The late Pleistocene origin of the Italian and Maltese populations ofPotamon fluviatile(Malacostraca: Decapoda): insights from an expanded sampling of molecular data

Vecchioni

Deidun

Sciberras³

et al. 2017

The European Zoological Journal

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Evidence available for most inland water and terrestrial organisms highlights the significant role played by southern Italy, Sicily and the Maltese islands as refuges during Pleistocene climatic fluctuations. However, to date, the hypothesis that these areas may have acted as Pleistocene refugia for the freshwater crab Potamon fluviatile has not been explicitly tested, and a recent origin of local P. fluviatile populations was proposed on the basis of a small set of analysed molecular data. We have thus expanded the currently available data set on the population genetic structure of P. fluviatile through dedicated samplings in Sicily (Italy, 18 specimens), the Maltese Islands (Malta, 15 specimens) and the island of Corfu (Greece, seven specimens), with the explicit aim of testing the role of southern Italy, Sicily and the Maltese archipelago as refugia where early Pleistocene or pre-Quaternary populations of the freshwater crab could have persisted to date. Based on the analysis of both novel and published cytochrome c oxidase subunit I (COI) sequence data, we gathered evidence supporting a recent origin of the southern Italian, Sicilian and Maltese populations of Potamon fluviatile from the Balkans, thus rejecting the hypothesised Pleistocene persistence in the area of pre-existing local populations of the same species.

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Claw asymmetry in crabs: approaching an old issue from a new point of view

Spani

Scalici

Crandall

et al. 2019

Biological Journal of the Linnean Society

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Crabs are considered exceptional examples of antisymmetry resulting from the phenomenon of heterochely. Here we investigate morphometrically both the size and the shape of heterochely in 28 crab species, distributed unequally along a brachyuran phylogeny. We address the importance of investigating claw size and shape for interspecific comparisons by linking geometric morphometric outputs to phylogenetic data for 134 brachyuran species. New indices introduced as new sexual dimorphic characters of size and shape, namely heterometry (right chela size/left chela size) and heteromorphy (Procrustes distance between right and left chelae shape), revealed sexually dimorphic differences in diverse crab species. We demonstrate that both size and shape heterochely occur amongst the examined species, but there are no ecological correlations. Our study demonstrates that claw similarity between two or more species was due mainly to phylogenetic relatedness rather than ecological convergence, suggesting that claw morphological features could be useful morphological markers in phylogenetic studies. Although further investigation is needed, this study represents one of the first to thoroughly analyse the origin and evolution of heterochely within the Brachyura clade.

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Morphometric homogeneity and allometric growth of Potamon fluviatile in Italy

Cited by 6 publications

References 14 publications

Ontogenetic variation of the Goyazana castelnaui H. Milne-Edwards, 1853 (Brachyura, Trichodactylidae), crab in the semiarid region of Brazil

Ontogenetic variation of the Goyazana castelnaui H. Milne-Edwards, 1853 (Brachyura, Trichodactylidae), crab in the semiarid region of Brazil

The late Pleistocene origin of the Italian and Maltese populations ofPotamon fluviatile(Malacostraca: Decapoda): insights from an expanded sampling of molecular data

Claw asymmetry in crabs: approaching an old issue from a new point of view

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