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Structure and genetic diversity of Macrobrachium Amazonicum complex
Gabriel Monteiro de Lima1, Beatriz Rochitti Boza2, Luciano Domingues Queiroz3
1Institute of Coastal Studies, Federal University of Pará, Bragança, 68600-000, Brazil.
Scientific Reports
|August 29, 2025
Summary
Single Nucleotide Polymorphism (SNP) markers confirmed Macrobrachium pantanalense as a distinct species from M. amazonicum. The study also revealed significant genetic structure within M. amazonicum populations, suggesting ongoing speciation.
Area of Science:
- * Zoology
- * Genetics
- * Evolutionary Biology
Background:
- * The Macrobrachium amazonicum species complex exhibits complex population structures and taxonomic uncertainties.
- * Previous studies using mitochondrial DNA markers had not fully resolved the phylogenetic relationships within this complex.
Purpose of the Study:
- * To evaluate the phylogenetic relationships and population structure of the Macrobrachium amazonicum species complex using Single Nucleotide Polymorphism (SNP) markers.
- * To clarify the taxonomic status of Macrobrachium pantanalense and investigate speciation processes within M. amazonicum.
Main Methods:
- * Genotyping of 969 Single Nucleotide Polymorphism (SNP) markers obtained through ddRAD sequencing.
- * Analysis of specimens from three distinct genetic lineages and one artificially isolated population of M. amazonicum and M. pantanalense.
Main Results:
- * High genetic structure was observed among M. amazonicum populations, particularly between inland freshwater and coastal basin groups.
- * SNP analyses confirmed M. pantanalense as a distinct species, providing molecular evidence for speciation.
- * Evidence suggests an ongoing speciation process between two clades (I and III) of M. amazonicum.
Conclusions:
- * The study provides the first molecular evidence resolving taxonomic uncertainties regarding M. pantanalense.
- * Significant population structure and potential ongoing speciation within M. amazonicum were identified.
- * Further research is recommended to fully elucidate the relationships between M. amazonicum lineages.
Keywords:
Amazon river prawnGenetic structurePhylogenetic relationshipsSingle nucleotide polymorphismMore Related Videos
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