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19 results for “Galaxiidae”
Fig. 3. A in Pathology associated with larval Eustrongylides sp. (Nematoda: Dioctophymatoidea) infection in Galaxias maculatus (Actinopterygii: Galaxiidae) from Patagonia, Argentina
Fig. 3. A. cross section of non-parasitized fish: striated hypaxial (h) and epaxial (e) musculature, Masson's trichrome. Bar = 350 μm; B. melanization (me) at one end of a cyst. Hematoxylin and Eosin. Bar = 350 μm; C. fibrotic capsule around larvae and complete disappearance of the epaxial musculature Hematoxylin and Eosin. Bar = 200 μm; D. compressive atrophy and fibrotic capsule around the parasites. cv: vertebral body, n: nematode, ns: neural spine, T. Masson. Bar = 90 μm; E. dense collagenous fibrotic capsule (arrow), parasitic cuticle (asterisk). Bar = 50 μm, F. melanin deposit (arrow). Masson's trichrome. Bar = 50 μm, G. erythrocytes (e) and melanomacrophagic centers (MMCs) around the nematode. Bar = 8 μm.
Fig. 1. A in Pathology associated with larval Eustrongylides sp. (Nematoda: Dioctophymatoidea) infection in Galaxias maculatus (Actinopterygii: Galaxiidae) from Patagonia, Argentina
Fig. 1. A. specimens of Galaxias maculatus showing melanized cysts located in the caudal peduncle. Bar = 15 mm; B. larva of Eustrongylides sp. emerging from the cyst. Bar = 1.5 mm μm; C. caudal peduncle of Galaxias maculatus showing 2 cysts, and a larva migrating through the musculature. Bar = 2.5 mm.
Fig. 2 in Pathology associated with larval Eustrongylides sp. (Nematoda: Dioctophymatoidea) infection in Galaxias maculatus (Actinopterygii: Galaxiidae) from Patagonia, Argentina
Fig. 2. Fourth-stage larva of Eustrongylides sp. from Galaxias maculatus. A. anterior end. Bar = 40 μm. Internal and external labial papillae (arrows); B. caudal extremity of male. Bar = 100 μm. Note three cuticles, outer second stage, middle third stage, and inner fourth stage (arrows).
Data from: Balancing genetic uniqueness and genetic variation in determining conservation and translocation strategies: a comprehensive case study of threatened dwarf galaxias, Galaxiella pusilla (Mack) (Pisces: Galaxiidae)
Genetic markers are widely used to define and manage populations of threatened species based on the notion that populations with unique lineages of mtDNA and well-differentiated nuclear marker frequencies should be treated separately. However a danger of this approach is that genetic uniqueness might be emphasized at the cost of genetic diversity, which is essential for adaptation and is potentially boosted by mixing geographically separate populations. Here we re-explore the issue of defining management units, focussing on a detailed study of Galaxiella pusilla, a small freshwater fish of national conservation significance in Australia. Using a combination of microsatellite and mitochondrial markers, 51 populations across the species range were surveyed for genetic structure and diversity. We found an inverse relationship between genetic differentiation and genetic diversity, highlighting a long-term risk of deliberate isolation of G. pusilla populations based on protection of unique lineages. Instead we adopt a method for identifying genetic management units that takes into consideration both uniqueness and genetic variation. This produced a management framework to guide future translocation and re-introduction efforts for G. pusilla which contrasted to the framework based on a more traditional approach that may overlook important genetic variation in populations.
FIGURE 12 in A review of Galaxiella pusilla (Mack) (Teleostei: Galaxiidae) in south-eastern Australia with a description of a new species
FIGURE 12. Examples of aquatic habitats occupied by Galaxiella toourtkoourt: a) Fitzroy River, T and W Road, Cobboboonee, Victoria, b) Bridgewater Lakes, Bridgwater Lakes Road, Tarragal, Victoria, c) Darlot Creek tributary, Etterick Tyrendarra Road, Tyrendarra, Victoria, d) Moyne River tributary, Woolsthorpe Heywood Road, Moyne, Victoria, e) Crawford River, Condah Coleraine Road, Branxholme, Victoria, f) Gosling Creek, Division Road, Murroon, Victoria.
FIGURE 13 in A review of Galaxiella pusilla (Mack) (Teleostei: Galaxiidae) in south-eastern Australia with a description of a new species
FIGURE 13. Examples of aquatic habitats occupied by Galaxiella pusilla s. s.: a) Dandenong Creek tributary, Brady Road, Endeavour Hills, Victoria, b) King Parrot Creek, Greenshield Road, Drouin, Victoria, c) Morwell River, Princes Freeway, Morwell, Victoria, d) Perry River, Princes Highway, Delvine, Victoria, e) Cobblers Creek, Forge Creek Road, Bairnsdale, Victoria, f) Big Waterhouse Lake, Homestead Road, Waterhouse, Tasmania.
FIGURE 11 in A review of Galaxiella pusilla (Mack) (Teleostei: Galaxiidae) in south-eastern Australia with a description of a new species
FIGURE 11. Collection sites and approximate current geographic distribution of Galaxiella toourtkoourt (light grey) and Galaxiella pusilla s.s. (dark grey). See Table 1 for site numbers and site details. Type localities are indicated by a white star.
FIGURE 4 in A review of Galaxiella pusilla (Mack) (Teleostei: Galaxiidae) in south-eastern Australia with a description of a new species
FIGURE 4. Boxplots of morphometric ratio data for male Galaxiella pusilla s.s. (black) and Galaxiella toourtkoourt (grey). Values are given as percentages of the first measurement over the second measurement listed on the x axes. Outliers that are>1.5 times the interquartile range above the upper quartile or below the lower quartile are indicated by a dot. See Fig. 1 for measurement descriptions.
FIGURE 10. a in A review of Galaxiella pusilla (Mack) (Teleostei: Galaxiidae) in south-eastern Australia with a description of a new species
FIGURE 10. a) Galaxiella toourtkoourt male (upper) and female (lower) from Narrow Neck Drain, Hatherleigh, South Australia (Photo by M. Hammer), b) Galaxiella pusilla s.s. male (lower) and female (upper) from Tuerong Creek, Moorooduc, Victoria (Photo by R. Kuiter).
FIGURE 3 in A review of Galaxiella pusilla (Mack) (Teleostei: Galaxiidae) in south-eastern Australia with a description of a new species
FIGURE 3. Boxplots of morphometric ratio data for female Galaxiella pusilla s.s. (black) and Galaxiella toourtkoourt (grey). Values are given as percentages of the first measurement over the second measurement listed on the x axes. Outliers that are>1.5 times the interquartile range above the upper quartile or below the lower quartile are indicated by a dot. See Fig. 1 for measurement descriptions.
FIGURE 9. a in A review of Galaxiella pusilla (Mack) (Teleostei: Galaxiidae) in south-eastern Australia with a description of a new species
FIGURE 9. a) line drawing of Galaxiella toourtkoourt holotype, NMV A.31214-001, female, Surrey River, Wrights Swamp Road, Cobboboonee, Vic., 29.2 mm SL (R. Plant); scale bar = 5 mm; b) line drawing of typical anterio-ventral surface markings on Galaxiella toourtkoourt (left) and Galaxiella pusilla s.s. (right) (R. Plant).
FIGURE 2 in A review of Galaxiella pusilla (Mack) (Teleostei: Galaxiidae) in south-eastern Australia with a description of a new species
FIGURE 2. Positions of 12 landmarks: 1. tip of snout, 2. posterior extent of lower jaw, 3. superior margin of eye, 4. inferior margin of eye, 5. origin of pelvic fin, 6. origin of dorsal fin, 7. posterior insertion of dorsal fin, 8. origin of anal fin, 9. posterior insertion of anal fin, 10. superior insertion of caudal fin, 11. midpoint of caudal fin base, 12. inferior insertion of the caudal fin, *. inferior margin of lower black band directly above '5' used with '1' and '11' to unbend specimens.
FIGURE 1 in A review of Galaxiella pusilla (Mack) (Teleostei: Galaxiidae) in south-eastern Australia with a description of a new species
FIGURE 1. Measurements: a) lateral body and fin; b) dorsal head; c) ventral head; and d) lateral head measurements. ALanal fin length; BDV—body depth at vent; DCP—caudal peduncle depth; DF–AF—dorsal fin to anal fin setback; DL—dorsal fin length; KD—keel depth; KL—keel length; LAB—anal fin base length; CL—caudal fin length; LCP—caudal peduncle length; LDB—dorsal fin base length; PecL—pectoral fin length; PelL—pelvic fin length; PelAn—distance between pelvic and anal fin bases; PecPel—distance between pectoral and pelvic fin bases; PreA—pre-anal fin length; PreD—pre-dorsal fin length; PrePel—pre-pelvic fin length; SL—standard length; TL—total length. ED—eye diameter; GD—gape depth; GWgape width; HD—head depth; HL—head length; HW—head width; IOW—inter-orbital width; LJL—lower jaw length; PoHL—post-orbital head length; SnL—snout length; UJL—upper jaw length.
FIGURE 8. Discriminant value histograms using shape information from Galaxiella pusilla s.s in A review of Galaxiella pusilla (Mack) (Teleostei: Galaxiidae) in south-eastern Australia with a description of a new species
FIGURE 8. Discriminant value histograms using shape information from Galaxiella pusilla s.s. (black) and Galaxiella toourtkoourt (grey) generated from 12 landmarks for a) females, b) males.
FIGURE 7. Principal components analysis using shape information for Galaxiella pusilla s.s in A review of Galaxiella pusilla (Mack) (Teleostei: Galaxiidae) in south-eastern Australia with a description of a new species
FIGURE 7. Principal components analysis using shape information for Galaxiella pusilla s.s. (black) and Galaxiella toourtkoourt (grey) generated from 12 landmarks for a) females (PC1 and PC2 explain 52.0% and 14.5% of the total variance, respectively), b) males (PC1 and PC2 explain 54.4% and 14.7% of the total variance, respectively), and shape changes associated with principal component 2 for c) females and d) males.
FIGURE 5 in A review of Galaxiella pusilla (Mack) (Teleostei: Galaxiidae) in south-eastern Australia with a description of a new species
FIGURE 5. Boxplots of total length (mm) measurements in the field of Galaxiella pusilla s.s. ('east') and Galaxiella toourtkoourt ('west') for a) females (east n = 451, west n = 478) and b) males (east n = 459, west n = 462). Outliers that are>1.5 times the interquartile range above the upper quartile or below the lower quartile are indicated by a dot.
Data from: Balancing genetic uniqueness and genetic variation in determining conservation and translocation strategies: a comprehensive case study of threatened dwarf galaxias, Galaxiella pusilla (Mack) (Pisces: Galaxiidae)
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Data from: Molecular phylogenetics and biogeography of galaxiid fishes (Osteichthyes: Galaxiidae): dispersal, vicariance, and the position of Lepidogalaxias salamandroides
The galaxiid fishes exhibit a gondwanan distribution. We use mitochondrial DNA sequences to test conflicting vicariant and dispersal biogeographic hypotheses regarding the southern hemisphere range of this freshwater group. Although phylogenetic resolution of cytochrome b and 16S rRNA sequences is largely limited to more recent divergences, our data indicate that the radiation can be interpreted as a number of relatively recent dispersal events superimposed on an ancient gondwanan radiation. Genetic relationships contradict the findings of recent morphological analyses of galaxioid fishes. In particular, a number of hypotheses regarding phylogenetic placement of the enigmatic Lepidogalaxias are examined. While most workers consider Lepidogalaxias to be an unusual scaled member of the southern hemisphere galaxioids, it has also been suggested that this species is related to the northern hemisphere esocoids. Our data strongly suggest that this species is not a galaxiid; the alternative hypothesised esocoid relationship cannot be rejected. The species-rich genus Galaxias is shown to be polyphyletic and the generic taxonomy of the Galaxiinae is reassessed in the light of phylogenetic relationships. Juvenile saltwater-tolerance is phylogenetically distributed throughout the Galaxiinae and the loss of this migratory phase may be a major cause of speciation.
Data from: Molecular phylogenetics and biogeography of galaxiid fishes (Osteichthyes: Galaxiidae): dispersal, vicariance, and the position of Lepidogalaxias salamandroides
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