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112 results for “Nothobranchius”
FIGURE 5 in Observations on growth rate and allometry in the seasonal predatory killifish Nothobranchius ocellatus (Teleostei: Cyprinodontiformes)
FIGURE 5. Graphical representation of the most important allometric growth changes in morphometric parameters as measured for the three subject specimens of Nothobranchius ocellatus, through the sub-adult to young sexually mature phases, at 37, 56 and 84 days after hatching. Data from Table 2.
FIGURE 6 in Observations on growth rate and allometry in the seasonal predatory killifish Nothobranchius ocellatus (Teleostei: Cyprinodontiformes)
FIGURE 6. Comparative morphometry of growth in selected specimens of Nothobranchius ocellatus; a, Score plot of principal component analysis (PCA) on morphometric characters; first vs. second principal components: female #1 (diamond), male #2 (circle), male #4 (inverted triangle); b, loading plot of PCA for female #1; c, loading plot of PCA for male #2; d, loading plot of PCA for male #4. Most important loadings with absolute magnitude greater than 0.4 appear in bold. Key to character abbreviations: TL, Total length; BD, Body depth at pelvic–fin origin; HL, Head length; PA, Preanal length; PD, Predorsal length; PV, Prepelvic length; PP, Prepectoral length; CPL, Caudal peduncle length; CPD, Caudal peduncle depth; DFB, Dorsal-fin base length; AFB, Anal-fin base length; CF, Caudal-fin length; HD, Head depth; PO, Postorbital length; SD, Suborbital depth; ED, Eye diameter; SEL, Snout to eye end length; SL, Snout length.
FIGURE 4 in Observations on growth rate and allometry in the seasonal predatory killifish Nothobranchius ocellatus (Teleostei: Cyprinodontiformes)
FIGURE 4. Sets of photographs (A, B and C) showing the development of sex distinction as reflected in changes in colour pattern, and some general morphological features, in the study specimens of Nothobranchius ocellatus at 37, 58 and 84 days age.
FIGURE 2 in Observations on growth rate and allometry in the seasonal predatory killifish Nothobranchius ocellatus (Teleostei: Cyprinodontiformes)
FIGURE 2. Illustration of the method used for measuring the total length (TL) of Nothobranchius ocellatus specimens on a weekly basis. Specimens were placed in very shallow water in a clear, flat-bottomed glass dish (of a size suited to the size of the specimen) over graph paper and photographed from above. A straight line was then digitally drawn from the terminus of the upper jaw to the posterior margin of the caudal fin. The line was then rotated into alignment with the grid of the graph paper in order to closely approximate TL.
FIGURE 1 in Observations on growth rate and allometry in the seasonal predatory killifish Nothobranchius ocellatus (Teleostei: Cyprinodontiformes)
FIGURE 1. Nothobranchius ocellatus: upper, wild-caught male from neotype locality (field code: Kikongono TAN 95-9); lower, wild-caught female (field code: Kitonga south TAN 97-36); Rufiji River drainage; central coastal region, Tanzania.
Figure 6 in Taxonomic revision of the seasonal killifish genus Nothobranchius from Zanzibar, East Africa (Cyprinodontoidei: Aplocheilidae)
Figure 6. Nothobranchius melanospilus (Pfeffer 1896), live exemplars: (a) UFRJ 6515, male, 32.6 mm SL; (b) UFRJ 6515, female, 31.1 mm SL.
Figure 4 in Taxonomic revision of the seasonal killifish genus Nothobranchius from Zanzibar, East Africa (Cyprinodontoidei: Aplocheilidae)
Figure 4. Geographical distribution of Nothobranchius guentheri (Pfeffer 1893), circles, and Nothobranchius melanospilus (Pfeffer 1896), squares.
Figure 5 in Taxonomic revision of the seasonal killifish genus Nothobranchius from Zanzibar, East Africa (Cyprinodontoidei: Aplocheilidae)
Figure 5. Nothobranchius melanospilus (Pfeffer 1896), BMNH 2016.12.2.1, lectotype, female, 35.2 mm SL.
Figure 3 in Taxonomic revision of the seasonal killifish genus Nothobranchius from Zanzibar, East Africa (Cyprinodontoidei: Aplocheilidae)
Figure 3. Diagrammatic representation of the latero-sensory system and frontal squamation on the dorsal surface of the head in: (a) Nothobranchius melanospilus, UFRJ 6874, male, 39.8 mm SL; (b) Nothobranchius guentheri, UFRJ 8416, male, 34.1 mm SL; asss: anterior section of the anterior supraorbital series; anss: posterior rostral neuromast; psss: posterior section of the anterior supraorbital series; poss: posterior supraorbital series; prn: posterior rostral neuromast. Scale bar: 2 mm.
Figure 2 in Taxonomic revision of the seasonal killifish genus Nothobranchius from Zanzibar, East Africa (Cyprinodontoidei: Aplocheilidae)
Figure 2. Nothobranchius guentheri (Pfeffer 1893), live exemplars: (a) UFRJ 8420, male, 33.1 mm SL; (b) UFRJ 8420, female, 29.3 mm SL.
Figure 2 in Reproductive isolating barriers between colour-differentiated populations of an African annual killifish, Nothobranchius korthausae (Cyprinodontiformes)
Figure 2. The number of eggs, fertilization rate and hatching success of pairings between sympatric and allopatric populations during the no-choice experiment. Means with SE (boxes) and confidence intervals (whiskers) for data on virgin and nonvirgin fish are indicated.
Figure 1 in Reproductive isolating barriers between colour-differentiated populations of an African annual killifish, Nothobranchius korthausae (Cyprinodontiformes)
Figure 1. The rates of male courtship towards females and female response (per 30 min) expressed for each male ¥ female combination and virgin and nonvirgin fish separately. Means with 1SE are indicated.
Figure 3 in Reproductive isolating barriers between colour-differentiated populations of an African annual killifish, Nothobranchius korthausae (Cyprinodontiformes)
Figure 3. The results of the hybrid performance experiment, with number of eggs (A) and hatching success (B) standardized within each experimental group shown. Means with 1SE (boxes) and confidence intervals (whiskers) are indicated for each experimental combination (mm, offspring of Mafia male and Mafia female; kk, offspring of Kwachepa male and Kwachepa female; mk: Mafia male, Kwachepa female; km: Kwachepa male, Mafia female). Sample size for the number of eggs is N = 8 replicates for each combination, sample size for hatching success is smaller (because only replicates with more than 5 eggs were analysed) and the exact N is given above each combination.
Data from: Strong population genetic structuring in an annual fish, Nothobranchius furzeri, suggests multiple savannah refugia in southern Mozambique
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FIGURE 4 in A new species of the genus Nothobranchius (Cyprinodontiformes: Nothobranchiidae) from the coastal area of northeastern Mozambique
FIGURE 4. Adult female of Nothobranchius hengstleri new species (not preserved). Photo by B. Nagy.
FIGURE 3 in A new species of the genus Nothobranchius (Cyprinodontiformes: Nothobranchiidae) from the coastal area of northeastern Mozambique
FIGURE 3. Adult male of Nothobranchius hengstleri new species (not preserved). Photo by W. Krammer.
Sex chromosome differentiation via changes in the Y chromosome repeat landscape in African annual killifishes Nothobranchius furzeri and N. kadleci
<p><span>Repetitive DNA represents an important driver of sex chromosome differentiation. Yet repetitive sequences tend to be misrepresented or overlooked in genomic studies. We analysed repetitive landscape of sex chromosomes in several populations of a turquoise killifish <em>Nothobranchius</em> <em>furzeri</em> and its sister species <em>N</em>. <em>kadleci</em> (Teleostei: Nothobranchiidae), representatives of African annual killifishes with high rate of karyotype and sex chromosome evolution. We combined bioinformatic analyses of repeatome with molecular cytogenetic techniques such as comparative genomic hybridization, fluorescence in situ hybridization with satellite sequences, genes for ribosomal RNAs (rDNA) and bacterial artificial chromosomes (BACs) and immunostaining of </span><span>SYCP3 and MLH1 proteins, which marked lateral elements of synaptonemal complexes and recombination sites, respectively</span><span>. We revealed that <em>N</em>. <em>furzeri</em> and <em>N</em>. <em>kadleci</em> share the XY sex chromosome system, which is thus much older than previously assumed. Sex chromosomes are mostly heteromorphic as evidenced by distinct distribution of satellite DNAs and major rDNA. Yet, the heteromorphic X and Y sex chromosomes pair almost exclusively regularly in meiosis, which implies synaptic adjustment. Physical mapping of BACs identified inversions on Y chromosomes of the <em>N</em>. <em>kadleci</em> populations, similar to the pattern previously reported in <em>N</em>. <em>furzeri</em>. Yet, the repetitive DNA landscape of X and Y sex chromosomes either diverged in parallel in populations of both species, or it evolved in their common ancestor and thus predates the inversions. The observed differentiation via repeat repatterning thus cannot be explained by the classical sexual antagonistic model. Rather, we hypothesized that relaxed meiotic drive and recombination reduced by neutral processes could drive changes in repeatome and secondary inversions could be maintained </span><span>by sexually antagonistic regulatory effects resulting from evolution of dosage compensation. </span><span><br></span></p>
Figure 5 from: Costa WJEM (2017) Redescription of Nothobranchius lucius and description of a new species from Mafia Island, eastern Tanzania (Cyprinodontiformes, Aplocheilidae). Zoosystematics and Evolution 93(1): 35-44. https://doi.org/10.3897/zse.93.11041
Figure 5 - Diagrammatic representation of the latero-sensory system on the dorsal surface of the head in: A. Nothobranchius lucius, MRAC A7-02-P-28-32, male, 43.6 mm SL; B. Nothobranchius insularis sp. n., MRAC A702-P-38-44, paratype, male, 48.3 mm SL. arn – anterior rostral neuromast; asass – anterior section of the anterior supraorbital series; prn – posterior rostral neuromast; psass – posterior section of the anterior supraorbital series; pss – posterior supraorbital series.
Figure 4 from: Costa WJEM (2017) Redescription of Nothobranchius lucius and description of a new species from Mafia Island, eastern Tanzania (Cyprinodontiformes, Aplocheilidae). Zoosystematics and Evolution 93(1): 35-44. https://doi.org/10.3897/zse.93.11041
Figure 4 - Jaws, jaw suspensorium and opercular apparatus, left side, lateral view, of: A. Nothobranchius lucius, paratype, male, MRAC A7-02-P-10-25, 43.0 mm SL; B. Nothobranchius melanospilus, male, UFRJ 6591, 43.5 mm SL. Larger stippling indicates cartilage. Scale bar = 1 mm.
Figure 3 from: Costa WJEM (2017) Redescription of Nothobranchius lucius and description of a new species from Mafia Island, eastern Tanzania (Cyprinodontiformes, Aplocheilidae). Zoosystematics and Evolution 93(1): 35-44. https://doi.org/10.3897/zse.93.11041
Figure 3 - Nothobranchius insularis sp. n.: A. MRAC A7-02-P-33, holotype, male, 52.9 mm SL; Tanzania: 3 km S of Kirongwe, Mafia Island; B. MRAC A7-02-P-38-44, paratype, male, 48.3 mm SL; Tanzania: 0.5 km S of Kirongwe, Mafia Island; C. MRAC A7-02-P-38-44, paratype, female, 49.8 mm SL; Tanzania: 0.5 km S of Kirongwe, Mafia Island.
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