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8 results for “headwater capture”
FIGURE 1 in The distribution of Cteniloricaria (Siluriformes: Loricariidae): known and new records in Brazil suggest headwater captures as drivers of disjoint distribution
FIGURE 1 | Distribution of Cteniloricaria in the Guiana Shield. Circles = C. platystoma according to Covain et al. (2012); black dots = C. platystoma, examined specimens. White star, type locality of C. napova; red star, new locality of C. napova. Each symbol can cover more than one lot or locality.
FIGURE 3 in The distribution of Cteniloricaria (Siluriformes: Loricariidae): known and new records in Brazil suggest headwater captures as drivers of disjoint distribution
FIGURE 3 | Loricaria platystoma, BMNH 1866.8.14.124, lectotype, 171.5 mm SL, Suriname. Photo by Mark Allen (WAM; ACSI Images Database).
FIGURE 2 in The distribution of Cteniloricaria (Siluriformes: Loricariidae): known and new records in Brazil suggest headwater captures as drivers of disjoint distribution
FIGURE 2 | Cteniloricaria napova, MPEG 34190, 117.4 mm SL, Brazil, Pará State, Óbidos municipality, unnamed creek tributary to Cuminapanema River, Curuá River basin (approx. 0°57'S 55°30'W).
FIGURE 3 in Genetic diversity of the species Cnesterodon hypselurus (Cyprinodontiformes: Poeciliidae) in Cinzas River basin: new record and headwater capture evidences
FIGURE 3 | Results of Bayesian analysis (STRUCTURE) for Cnesterodon hypselurus in Cinzas River basin (CIN) and Lambari stream (LAM), Itararé River basin. Estimates of the number of K groups based on mean A. Likelihood Ln(K) and B. ∆K statistic. C. Graphical representation based on K = 2. Each column represents a different individual and the colors represent the probability membership coefficient of that individual for each genetic cluster.
FIGURE 1 in Genetic diversity of the species Cnesterodon hypselurus (Cyprinodontiformes: Poeciliidae) in Cinzas River basin: new record and headwater capture evidences
FIGURE 1 | Distribution of Cnesterodon hypselurus occurrence locations and the sampling sites used in the genetic study. CIN - new occurrence record in Cinzas River basin (unnamed stream), LAM - Lambari and PED - Pedrinhas streams in Itararé River basin and GUA - Guaricanga stream in Tibagi River basin (Source: modified from Silva et al., 2015; Franco-Magalhaes et al., 2010, and Google Earth, 2018, https://www. google.com.br/maps).
FIGURE 2 in Genetic diversity of the species Cnesterodon hypselurus (Cyprinodontiformes: Poeciliidae) in Cinzas River basin: new record and headwater capture evidences
FIGURE 2 | Results from mtDNA (D-Loop) of Cnesterodon hypselurus samples obtained in Cinzas River basin (CIN) and some other locations along the occurrence area reported for this species. A. Haplotype network. Circle sizes are proportional to haplotype frequency. Mismatch distributions of mitochondrial haplotypes for CIN and LAM are shown in B and C, respectively.
Speciation in coastal basins driven by staggered headwater captures: Dispersal of a species complex, Leporinus bahiensis, as revealed by genome-wide SNP data
<p>Past sea level changes and geological instability along watershed boundaries have largely influenced fish distribution across coastal basins, either by dispersal via palaeodrainages now submerged or by headwater captures, respectively. Accordingly, the South American Atlantic coast encompasses several small and isolated drainages that share a similar species composition, representing a suitable model to infer historical processes. <em>Leporinus</em> <em>bahiensis</em> is a freshwater fish species widespread along adjacent coastal basins over narrow continental shelf with no evidence of palaeodrainage connections at low sea level periods. Therefore, this study aimed to reconstruct its evolutionary history to infer the role of headwater captures in the dispersal process. To accomplish this, we employed molecular-level phylogenetic and population structure analyses based on Sanger sequences (5 genes) and genome-wide SNP data. Phylogenetic trees based on Sanger data were inconclusive, but SNPs data did support the monophyletic status of <em>L. bahiensis</em>. Both COI and SNP data revealed structured populations according to each hydrographic basin. Species delimitation analyses revealed from 3 (COI) to 5 (multilocus approach) MOTUs, corresponding to the sampled basins. An intricate biogeographic scenario was inferred and supported by Approximate Bayesian Computation (ABC) analysis. Specifically, a staggered pattern was revealed and characterized by sequential headwater captures from basins adjacent to upland drainages into small coastal basins at different periods. These headwater captures resulted in dispersal throughout contiguous coastal basins, followed by deep genetic divergence among lineages. To decipher such recent divergences, as herein represented by <em>L. bahiensis </em>populations, we used genome-wide SNPs data. Indeed, the combined use of genome-wide SNPs data and ABC method allowed us to reconstruct the evolutionary history and speciation of <em>L. bahiensis</em>. This framework might be useful in disentangling the diversification process in other neotropical fishes subject to a reticulate geological history. </p>
Speciation in coastal basins driven by staggered headwater captures: Dispersal of a species complex, Leporinus bahiensis, as revealed by genome-wide SNP data
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