Journal ArticleDOI
Molecular phylogeny of the freshwater prawn genus Macrobrachium (Decapoda, Palaemonidae), with emphasis on the relationships among selected American species
TLDR
The phylogenetic analysis of new mitochondrial DNA sequences of 58 species of Macrobrachium distributed mainly in America support the hypothesis of monophyly of this genus, and conclude that the independent evolution of different types of life cycle must have occurred more than once in the history of the group.Abstract:
The genus Macrobrachium Bate, 1868 is one of the best examples of widespread crustacean genera distributed globally throughout tropical and subtropical waters. Previous investigators have noted the systematic complexity of the group, and have suggested rearrangements within the family Palaemonidae. Our phylogenetic analysis of new mitochondrial DNA sequences of 58 species of Macrobrachium distributed mainly in America support the hypothesis of monophyly of this genus, if Cryphiops Dana, 1852 is accepted as a generic synonym. We concluded that the independent evolution of different types of life cycle (abbreviated larval development – ALD and extended larval development – ELD) must have occurred more than once in the history of the group. Similarly, we also concluded that the current type species of the genus, Macrobrachium americanum Bate, 1868, should not be considered valid, as previously proposed. The synonymy of two members of the ‘olfersi’ species complex (M. birai Lobao, Melo & Fernandes, 1986 and M. holthuisi Genofre & Lobao, 1978) with M. olfersi (Wiegmann, 1836) was confirmed. Similar results were found in comparing M. petronioi Melo, Lobao & Fernandes, 1986 and M. potiuna (Muller, 1880), in which the genetic divergence placed M. petronioi within the level of intraspecific variation of M. potiuna. The taxonomic status of the genus Cryphiops, as well as theories on the origin of Macrobrachium, is also called into question.read more
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Evolution of osmoregulatory patterns and gill ion transport mechanisms in the decapod Crustacea: a review
TL;DR: This review incorporates the notion of a protracted time scale, here termed ‘phylophysiology’, into decapod osmoregulation, allowing the examination of putative physiological transformations and their underlying evolutionary processes.
Journal ArticleDOI
Neotropical Macrobrachium (Caridea: Palaemonidae): on the biology, origin, and radiation of freshwater-invading shrimp.
TL;DR: An origin of ancestral Macrobrachium in the Mesozoic is suggested, as a consequence of the breakup of Gondwana and fragmentation of the Tethys Sea, Neotropical and West African clades became isolated from the remaining congeners and thus can be considered as Tethyan relicts.
Journal ArticleDOI
Genetic variability of the Amazon River prawn Macrobrachium amazonicum (Decapoda, Caridea, Palaemonidae)
TL;DR: Compared and characterized inland and coastal populations of M. amazonicum from Brazil, using molecular data (16S and COI mtDNA) to describe the degree of variability, structure, and relationships among them and revealed that the populations form a single monophyletic clade, which supports their characterization as a single species.
Journal ArticleDOI
Amphidromy in shrimps: a life cycle between rivers and the sea
TL;DR: Amphidromy is a diadromous life history pattern, common in tropical and subtropical freshwater caridean shrimps, in which adults live, breed and spawn small-...
Journal ArticleDOI
Ontogeny of osmoregulatory patterns in the South American shrimp Macrobrachium amazonicum: Loss of hypo-regulation in a land-locked population indicates phylogenetic separation from estuarine ancestors
Guy Charmantier,Klaus Anger +1 more
TL;DR: Results show in two hydrologically and genetically isolated shrimp populations close relationships between differential patterns of ontogenetic change in osmoregulatory functions, salinity tolerance, and the ecology of successive life-history stages.
References
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Intraspecific Phylogeography: The Mitochondrial DNA Bridge Between Population Genetics and Systematics
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TL;DR: This poster presents a probabilistic procedure to characterize the response of the immune system to E.coli bacteria and shows clear patterns in response to the presence of E. coli.
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Optimization alignment: the end of multiple sequence alignment in phylogenetics?
TL;DR: A method is described to assess directly the number of DNA sequence transformations, evolutionary events, required by a phylogenetic topology without the use of multiple sequence alignment through a generalization of existing character optimization procedures to include insertion and deletion events (indels) in addition to base substitutions.
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Sequence alignment, parameter sensitivity, and the phylogenetic analysis of molecular data
TL;DR: The dependence of the results of molecular phylogenetic sequence analysis (both align ment and cladogram construction) on variation in analytical parameters is examined and procedures for robust and liberal hypothesis choice are proposed using congruence as an optimality criterion.
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Phylogeny of a rapidly evolving clade: The cichlid fishes of Lake Malawi, East Africa
TL;DR: It is demonstrated that adaptive divergence in trophic morphology played an important role during the early history of the lake, which suggests that other forces are responsible for the continued speciation of these fishes.