Shell shape variation in Amazonian freshwater mussels (Unionida: Hyriidae: Hyriini)

Mata, Liliane Sousa da; Tagliaro, Cláudia Helena; Simeone, Diego; Beasley, Colin Robert

doi:10.1093/mollus/eyz001

Cited by 3 publications

(1 citation statement)

References 66 publications

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“…On the other hand, the distribution of C. inflata was linked to lowlands in silted environments, fine substrates, high concentrations of particulate organic matter, and low conductivity (35 to 70 µS/cm 3 ), commonly in wetlands under the influence of the flood pulse, as in the Pantanal. Recent studies carried out on rivers in the Amazon hydrographic basin have shown that the shape of the shell in the Hyriini is largely associated with drainage characteristics [69].…”

Section: Distribution Morphology and Taxonomymentioning

confidence: 99%

Phylogenetic Assessment of Freshwater Mussels Castalia ambigua and C. inflata at an Ecotone in the Paraguay River Basin, Brazil Shows That Inflated and Compressed Shell Morphotypes Are the Same Species

et al. 2020

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The phylogeny and taxonomy of freshwater mussels of the genus Castalia in South America is complicated by issues of morphological plasticity and limited molecular genetic data. We present field data on the distributions of the nominal Castalia ambigua and C. inflata in the upper Paraguay River basin in Brazil based on original occurrence data at 23 sample sites and on historical records. The upper basin has distinct highland and lowland regions, the latter including the Pantanal wetland, where “C. ambigua” occurs in the highlands and “C. inflata” occurs in both regions. At Baixo Stream in the highlands, we observed individuals with shell morphologies of either C. ambigua or C. inflata, and also individuals with intermediate shell morphology. DNA sequence variation in the upland Baixo Stream and two representative lowland populations were screened. Two mitochondrial and three nuclear genes were sequenced to test hypotheses regarding the number of species-level phylogenetic lineages present. Reported individual DNA sequences from Amazon-basin C. ambigua and other Castalia and outgroup species were included in the analysis as outgroups. Individuals from the Paraguay River basin exhibited 17 haplotypes at the mitochondrial cytochrome oxidase I (COI) gene and nine at mitochondrial 16S rRNA. Analysis of haplotype networks and phylogenetic trees of combined COI + 16S rRNA sequences among individuals with the respective shell morphologies supported the hypothesis that C. ambigua and C. inflata from the Paraguay River basin belong to the same species and one phylogenetic lineage. No variation was observed at the nuclear 18S rRNA internal transcribed spacer, 28S rRNA, or H3NR histone genes among individuals used in this study. Across all markers, less variation was observed among Paraguay basin populations than between Paraguay and Amazon basin populations. Our results collectively suggest that: (1) “C. ambigua”, “C. inflata”, and morphologically intermediate individuals within the upper Paraguay drainage represent one phylogenetic lineage, (2) a phylogeographic divide exists between Castalia populations occurring in the Paraguay and Amazon River basins, and (3) the evolutionary and taxonomic uncertainties that we have identified among Castalia species should be thoroughly assessed across their distribution using both morphological and molecular characters.

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Section: Distribution Morphology and Taxonomymentioning

confidence: 99%

Phylogenetic Assessment of Freshwater Mussels Castalia ambigua and C. inflata at an Ecotone in the Paraguay River Basin, Brazil Shows That Inflated and Compressed Shell Morphotypes Are the Same Species

et al. 2020

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Relative importance of the environment and sexual dimorphism in determining shell shape in the Amazonian freshwater mussel Castalia ambigua (Unionida: Hyriidae) along a hydrological gradient

et al. 2022

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Shell shape variation of the freshwater mussel Castalia ambigua in relation to environmental and genetic drivers remains unresolved in South America. Along an increasing upstream to downstream hydrological gradient in the Caeté River, eastern Amazon, Brazil, we evaluated two co-occurring morphotypes of C. ambigua: the rst is elongated and compressed; the second is rounded and in ated. We performed multivariate shape analysis on the lateral view of the right valve and the umbonal view, to identify potential ecophenotypic trends. We also investigated whether the degree of shell in ation was associated with sexual dimorphism. Castalia ambigua shell shape differed along the hydrological gradient and between morphotypes. However, in high hydraulic energy habitats the two morphotypes tend to converge.In ated shells of C. ambigua corresponded to female specimens, implying that shell shape variation in low hydraulic energy habitats was associated with sexual dimorphism. We found strong evidence of ecophenotypic plasticity and variation in sexual dimorphism in the freshwater mussel C. ambigua, associated with a hydrological gradient. Ecophenotypic plasticity appears to override sex-linked shell shape determination in high energy habitats. Differences in shell shape and the identi cation of ecomorphotypes are important for management efforts, such as protecting the speci c habitats associated with both morphotypes.

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Using two- and three-dimensional landmark data to examine the shape variation of Elliptio complanata from two heavily impounded rivers in northern New York (USA)

Nagel-Myers,

Walrath,

Bowdish

2024

Journal of Molluscan Studies

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Despite vast improvements in the quantification of shape variation with geometric morphometric methods, evaluating morphological variation in unionids has remained difficult due to the lack of measurable landmarks on shells and their overall morphological plasticity. In this study, we supplement traditional two-dimensional landmark data with three-dimensional landmark data. Using photogrammetry, we generate three-dimensional models that are landmarked. This approach adds a new, third dimension to capture shape changes, providing a more detailed understanding of the shell topography. With this method, we explore the differences in shell shape along river stretches of two heavily impounded rivers in northern New York (USA). We ask whether isolation by distance, presence of dams and/or difference in land use around sampling localities impact the shell morphologies of Elliptio complanata populations. Our data suggest that, although separated for almost a century, these unionid populations do not show a pattern of increased morphological difference with distance. But we find that broad, rounded morphs that are posteriorly extended occur more frequently in reservoir environments while unaltered river habitats have a higher number of slim and more elongated variants.

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Shell shape variation in Amazonian freshwater mussels (Unionida: Hyriidae: Hyriini)

Cited by 3 publications

References 66 publications

Phylogenetic Assessment of Freshwater Mussels Castalia ambigua and C. inflata at an Ecotone in the Paraguay River Basin, Brazil Shows That Inflated and Compressed Shell Morphotypes Are the Same Species

Phylogenetic Assessment of Freshwater Mussels Castalia ambigua and C. inflata at an Ecotone in the Paraguay River Basin, Brazil Shows That Inflated and Compressed Shell Morphotypes Are the Same Species

Relative importance of the environment and sexual dimorphism in determining shell shape in the Amazonian freshwater mussel Castalia ambigua (Unionida: Hyriidae) along a hydrological gradient

Using two- and three-dimensional landmark data to examine the shape variation of Elliptio complanata from two heavily impounded rivers in northern New York (USA)

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