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1,103 results for “Actinopterygii”
FIGURE 4 in Diversity of Loricariidae (Actinopterygii: Siluriformes) assemblages in two Conservation Areas of the Middle Xingu River, Brazilian Amazon, and their suitability for sustainable ornamental fisheries
FIGURE 4 | Principal Component Analysis (PCA) of fish composition in the drainages of both the Xingu and Iriri River RESEXes (Hellinger transformation). Only species names that made greatest contributions to compositional differences are shown.
FIGURE 2 in Diversity of Loricariidae (Actinopterygii: Siluriformes) assemblages in two Conservation Areas of the Middle Xingu River, Brazilian Amazon, and their suitability for sustainable ornamental fisheries
FIGURE 2 | Venn diagram showing the compositions of the Loricariidae species found in both extractive reserves.
Fig. 3. Representative C in Allopatric chromosomal variation in Nematocharax venustus Weitzman, Menezes & Britski, 1986 (Actinopterygii: Characiformes) based on mapping of repetitive sequences
Fig. 3. Representative C-banded karyotypes of Nematocharax venustus from (a) Almada, Gongogi 1, Gongogi 2, Gongogi 3, Jequitinhonha 1, Jequitinhonha 2 and (b) Upper Contas. Bar = 5 µm.
Fig. 5 in Allopatric chromosomal variation in Nematocharax venustus Weitzman, Menezes & Britski, 1986 (Actinopterygii: Characiformes) based on mapping of repetitive sequences
Fig. 5. Representative metaphases for each different pattern reported in populations of Nematocharax venustus showing the hybridization with 18S (magenta) and 5S rDNA probes (green) (double-FISH) and only DAPI staining for (a, b) Almada, Gongogi 1, and Jequitinhonha 1; (c, d) Gongogi 3; (e, f) Gongogi 2; (g, h) Jequitinhonha 2; and (i, j) Upper Contas. The asterisks indicate the chromosomes marked by FISH. Bars = 5 µm.
Fig. 1 in Allopatric chromosomal variation in Nematocharax venustus Weitzman, Menezes & Britski, 1986 (Actinopterygii: Characiformes) based on mapping of repetitive sequences
Fig. 1. Map of Brazil (a) and collection sites (b) of Nematocharax venustus along the Almada (Almada), Contas (Upper Contas, Gongogi 1, 2, and 3), and Jequitinhonha River basins (Jequitinhonha 1 and 2) in the states of Bahia and Minas Gerais.
Fig. 4 in Allopatric chromosomal variation in Nematocharax venustus Weitzman, Menezes & Britski, 1986 (Actinopterygii: Characiformes) based on mapping of repetitive sequences
Fig. 4. Chromosomes of distinct populations of Nematocharax venustus after silver nitrate staining (Ag-NORs), base-specific fluorochrome staining (CMA 3 /DA/DAPI) and FISH with 18S (magenta) and 5S rDNA probes (green). Bar = 5 µm. The FISH with ribosomal probes confirmed the The first pattern, shared by specimens from the Almada occurrence of a single NOR system in most populations. The River and some populations from the Contas (Gongogi 1) only exception refers to one sample in the Jequitinhonha River and Jequitinhonha River basins (Jequitinhonha 1), includes basin (named Jequitinhonha 2), which presented additional 18S rRNA genes at terminal region of short arms of a 18S rDNA sites on long arms in one homologous from pair 8 sm pair (equivalent to Ag-NORs) and 5S rRNA genes at and on short arms of a single chromosomes from pair 10. This interstitial region on short arms of two pairs (16 – sm, and procedure was also informative in revealing four distribution 21 – st). The population from Gongogi 3 differs from this patterns of 18S and 5S rDNA in N. venustus (Fig. 4). pattern by presenting heteromorphic 5S rDNA cistrons
Fig. 7. A and B in Reproduction of Brevoortia aurea (Spix & Agassiz, 1829) (Actinopterygii: Clupeidae) in the Mar Chiquita Coastal Lagoon, Buenos Aires, Argentina
Fig. 7. A and B: Batch fecundity as a function of total weight (without ovary) and total length, respectively. C and D: Relative fecundity as a function of total weight (without ovary) and total length respectively.
Fig. 4 in Reproduction of Brevoortia aurea (Spix & Agassiz, 1829) (Actinopterygii: Clupeidae) in the Mar Chiquita Coastal Lagoon, Buenos Aires, Argentina
Fig. 4. Monthly relative frequency of the different gonadal development stages observed in females of Brevoortia aurea on the annual cycle, and the added samples of October and November for the Mar Chiquita coastal lagoon.
Fig. 8 in Reproduction of Brevoortia aurea (Spix & Agassiz, 1829) (Actinopterygii: Clupeidae) in the Mar Chiquita Coastal Lagoon, Buenos Aires, Argentina
Fig. 8. Proportion of mature individuals observed for each length classes of Brevoortia aurea. Females (black circles, dotted line) L 50 = 27.77 cm, N = 588. Males (white circles, solid line) L 50 = 26.59 cm, N = 293.
Fig. 2 in Reproduction of Brevoortia aurea (Spix & Agassiz, 1829) (Actinopterygii: Clupeidae) in the Mar Chiquita Coastal Lagoon, Buenos Aires, Argentina
Fig. 2. Captures per unite effort (CPUE kg/h), temperature (°C) and salinity (psu) obtained for Brevoortia aurea during sampled period in Mar Chiquita Coastal Lagoon.
Fig. 5. A in Reproduction of Brevoortia aurea (Spix & Agassiz, 1829) (Actinopterygii: Clupeidae) in the Mar Chiquita Coastal Lagoon, Buenos Aires, Argentina
Fig. 5. A: oogonias (arrow) and primary growth (p) oocytes; B: cortical alveoli stage oocyte (arrow); C: yolked oocytes; D: hydrated oocytes (arrow); E: details of a yolked oocyte (r: radiata zone; g: granulosa cells; t: teca cells); F: atresic follicle (arrow); G: post-ovulatory follicle "0" (arrow); H: post-ovulatory follicle "1" (arrow). Scale bars: A, E 25 μm; B, C, F, G, H, 100 μm; D, 250 μm.
Fig. 3 in Reproduction of Brevoortia aurea (Spix & Agassiz, 1829) (Actinopterygii: Clupeidae) in the Mar Chiquita Coastal Lagoon, Buenos Aires, Argentina
Fig. 3. Monthly variation of the gonadosomatic index (GSI) (females only), based on an annual cycle.
Fig. 6 in Reproduction of Brevoortia aurea (Spix & Agassiz, 1829) (Actinopterygii: Clupeidae) in the Mar Chiquita Coastal Lagoon, Buenos Aires, Argentina
Fig. 6. Frequency distribution of oocyte diameters (N = 6000 oocytes measured). From black bars to white bars: Primary growth oocyte, cortical alveoli, yolked oocytes and hydrated oocytes.
FIGURE 1 in Intraspecific variation in fossil vertebrate populations: Fossil killifishes (Actinopterygii: Cyprinodontiformes) from the Oligocene of Central Europe
FIGURE 1. Photograph of a plate with Paralebias cephalotes (P.36131, NHM, collected from Aix-en-Provence, France). Scale bar equals 6 cm.
FIGURE 3 in Intraspecific variation in fossil vertebrate populations: Fossil killifishes (Actinopterygii: Cyprinodontiformes) from the Oligocene of Central Europe
FIGURE 3. Bar charts showing frequency distribution of meristic characters for the three fossil Killifish species Prolebias rhenanus (yellow), Pr. stenoura (green) and Paralebias cephalotes (blue). 1, number of vertebrae; 2, number of precaudal vertebrae; 3, number of caudal vertebrae; 4, number of dorsal pterygiophores; 5, number of anal pterygiophores.
FIGURE 2 in Intraspecific variation in fossil vertebrate populations: Fossil killifishes (Actinopterygii: Cyprinodontiformes) from the Oligocene of Central Europe
FIGURE 2. Photographs of fossil killifish species examined in this study. 1, Prolebias rhenanus (Ru 99, Naturhistorisches Museum Basel); 2, Pr. stenoura (28491 n, NHM); 3, Paralebias cephalotes (P.1831a, NHM). Scale bars equal 1 cm.
FIGURE 4 in Intraspecific variation in fossil vertebrate populations: Fossil killifishes (Actinopterygii: Cyprinodontiformes) from the Oligocene of Central Europe
FIGURE 4. Bar charts showing frequency distribution of morphometric data (in mm) for the three fossil Killifish species Prolebias rhenanus (yellow), Pr. stenoura (green) and Paralebias cephalotes (blue). 1, standard length; 2, precaudal length of vertebral column; 3, caudal length of vertebral column; 4, length of dorsal fin base; 5, length of anal fin base.
Figure 2. - A in Invalidity of Gasterosteus gymnurus (Cuvier, 1829) (Actinopterygii, Gasterosteidae) according to integrative taxonomy
Figure 2. - A: Gasterosteus aculeatus, MNHN 2013-1299, FFFtag12285, 35 mm SL, Taute (Douve drainage) at Tribehou, France, 17 Sep. 2013; B: G. gymnurus, MNHN 2014-0010, FFFtag12314, 42 mm SL, Blaise (Seine drainage) at Saint-Ange-et-Torçais, France, 24 Sep. 2013.
Figure 3 in Invalidity of Gasterosteus gymnurus (Cuvier, 1829) (Actinopterygii, Gasterosteidae) according to integrative taxonomy
Figure 3. - Bayesian tree of the cytochrome c oxidase subunit I (COI) for 194 individuals of Gasterosteus spp. and other gasterosteids. The mean a posteriori values of the parameters are: TL = 38.329096; alpha = 0.076817; pinvar = 0.308267. As a reminder, G. aculeatus is full plated, whereas G. gymnurus has two to 10 lateral plates on both sides.
Figure 1 in Invalidity of Gasterosteus gymnurus (Cuvier, 1829) (Actinopterygii, Gasterosteidae) according to integrative taxonomy
Figure 1. - Geographical distribution of the vouchers used in the analysis in polar view. Gasterosteus aculeatus (black squares), G. gymnurus (white squares), G. islandicus (white circle), G. wheatlandi (white stars) and unidentified morphologically specimens (grey squares). Asterisks mean approximative locations.
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International Brain Laboratory public data
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OpenNeuro
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