Geometric morphometric analysis of the variations in cephalothorax shape of the freshwater prawn Macrobrachium tenellum, Smith (Decapoda Palaemonidae) from two different coastal basins in Oaxaca, Mexico

García-Guerrero, Marcelo ^[1] ; Martínez-Salazar, Nathali ^[1] ; Ramírez-Ponce, Andrés ^[2] ; de los Santos-Romero, Rodolfo ^[3]
1. [1] Instituto Politécnico Nacional
  
  Instituto Politécnico Nacional
  
  México
2. [2] Instituto de Ecología
  
  Instituto de Ecología
  
  México
3. [3] Tecnológico Nacional de México
  
  Tecnológico Nacional de México
  
  México
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Localización: Latin American Journal of Aquatic Research, ISSN-e 0718-560X, ISSN 0716-1069, Vol. 51, Nº. 4, 2023, págs. 471-482
Idioma: inglés
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Resumen
- Morphological variations of Macrobrachium tenellum prawns from two populations from locations in the Copalita and Colotepec riverine basins in the seashore of Oaxaca, Mexico, were studied with geometric morphometry techniques. The purpose was to find and explain significant differences in shape and size between the cephalothorax and the rostrum. Differences between sexes and populations were intended to prove intra and inter-populations. Results suggest low intrapopulation differences but significant interpopulation variation between specimens from different places, while a regression analysis suggests a higher correlation between shape and size only in males. The higher differences in places between and within sexes could be explained due to differences in environmental pressure. A positive allometry bias in males could indicate a sexual selection mechanism affecting mating.