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8 results for “Triportheus”
Fig. 2 in Effects of flood regime on the diet of Triportheus curtus (Garman, 1890) in an Amazonian floodplain lake
Fig. 2. Variation in river level (measured every three days) during the hydrological cycle from 2008 to 2009 in Lake Amapá. Gray line shows the threshold level for flooding from the Acre River. Main periods of pre-flooding, flooding, and postflooding are indicated at the base of the graph.
Fig. 1 in Effects of flood regime on the diet of Triportheus curtus (Garman, 1890) in an Amazonian floodplain lake
Fig. 1. Location of Lake Amapá and sampling points P1, P2, and P3.
Data from: Divergent natural selection with gene flow along major environmental gradients in Amazonia: insights from genome scans, population genetics and phylogeography of the characin fish Triportheus albus
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Fig. 3 in Effects of flood regime on the diet of Triportheus curtus (Garman, 1890) in an Amazonian floodplain lake
Fig. 3. Scores derived from Detrended Correspondence Analysis (DCA), considering the seasonal ordination of Triportheus curtus in the periods of the hydrological cycle of Lake Amapá.
Fig. 4 in Effects of flood regime on the diet of Triportheus curtus (Garman, 1890) in an Amazonian floodplain lake
Fig. 4. Mean values for scores (± standard error) for axes 1 (a) and 2 (b) of the detrended correspondence analysis (DCA), in the different sampling periods.
FIGURE 34. Triportheus auritus, ROM 67298, 167 in Annotated list and key to the stream fishes of Trinidad & Tobago
FIGURE 34. Triportheus auritus, ROM 67298, 167 mm SL, Barama River, Guyana.
Data from: Highly conserved Z and molecularly diverged W chromosomes in the fish genus Triportheus (Characiformes, Triportheidae)
The main objectives of this study were to test: (1) whether the W-chromosome differentiation matches to species' evolutionary divergence (phylogenetic concordance) and (2) whether sex chromosomes share a common ancestor within a congeneric group. The monophyletic genus Triportheus (Characiformes, Triportheidae) was the model group for this study. All species in this genus so far analyzed have ZW sex chromosome system, where the Z is always the largest chromosome of the karyotype, whereas the W chromosome is highly variable ranging from almost homomorphic to highly heteromorphic. We applied conventional and molecular cytogenetic approaches including C-banding, ribosomal DNA mapping, comparative genomic hybridization (CGH) and cross-species whole chromosome painting (WCP) to test our questions. We developed Z- and W-chromosome paints from T. auritus for cross-species WCP and performed CGH in a representative species (T. signatus) to decipher level of homologies and rates of differentiation of W chromosomes. Our study revealed that the ZW sex chromosome system had a common origin, showing highly conserved Z chromosomes and remarkably divergent W chromosomes. Notably, the W chromosomes have evolved to different shapes and sequence contents within ~15–25 Myr of divergence time. Such differentiation highlights a dynamic process of W-chromosome evolution within congeneric species of Triportheus.
Data from: Highly conserved Z and molecularly diverged W chromosomes in the fish genus Triportheus (Characiformes, Triportheidae)
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