Sexual dimorphism in the carapace shape and length of the freshwater palaemonid shrimp Macrobrachium potiuna (Müller, 1880) (Decapoda: Caridea: Palaemonidae): geometric and traditional morphometric approaches

in Animal Biology
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Sexual dimorphism is characterized by morphological, physiological, or behavioral differences between males and females. The genus Macrobrachium is a diverse group of freshwater shrimps distributed throughout tropical and subtropical regions. They have a great intra- and interspecific morphological variation, with some species showing sexual dimorphism. We investigated the sexual dimorphism of the size and shape of the carapace and body weight of Macrobrachium potiuna (Müller, 1880) in three populations of the State of Paraná through traditional and geometric morphometric techniques. The populations were sampled from three rivers: the Pombas River, Coastal Basin, the Piraquara River, First Plateau, and the Guabiroba River, Second Plateau. Morphometric analyses indicated that male shrimps showed differences in carapace length and body weight: the higher the distance from the sea, the smaller and lighter the shrimps. Carapace shape also differed significantly between the sexes in all three populations, with males having a less robust carapace, but a more elongated rostrum than females. The morphological differences between the genders seem to reflect the reproductive roles of males and females in this environment.

Sexual dimorphism in the carapace shape and length of the freshwater palaemonid shrimp Macrobrachium potiuna (Müller, 1880) (Decapoda: Caridea: Palaemonidae): geometric and traditional morphometric approaches

in Animal Biology

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Figures

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    Location of the sampling sites used on the present study showing the three populations. Coastal Basin (Pombas River – 25°39′12″S, 48°35′06.1″W; 13 km away from the sea), First Plateau (Piraquara River – 25°31′01.25″S, 49°00′30.55″W; 58 km away from the sea) and Second Plateau (Guabiroba River – 25°15′06.3″S, 50°00′59.0″W; 168 km away from the sea), Paraná State. Abbreviations: SP, state of São Paulo; SC, state of Santa Catarina.

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    Anatomical landmarks and semi-landmarks on the right side of the carapace. (1) rostrum apex, (2) epigastric tooth, (3) post-rostral keel, (5) lower anterior angle, (6) antennal spine, (7) hepatic spine, semi-landmarks 4, 8 and 9 set from the anatomical landmarks (3, 6 and 2).

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    Median carapace length of males and females. Abbreviations: CB, Coastal Basin; FP, First Plateau; SP, Second Plateau. Different small letters indicate that the means differ statistically.

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    Median body weight of males and females. Abbreviations: CB, Coastal Basin; FP, First Plateau; SP, Second Plateau. Different small letters indicate that the means differ statistically.

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    Sexual dimorphism in the carapace shape of Macrobrachium potiuna and frequencies from Discriminant Analysis. Deformations amplified three times. Black line indicates female and red line indicates male.

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