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10 results for “galaxiid”
Figure 5 in Landscape biogeography and population structuring of a facultatively amphidromous galaxiid fish, Galaxias brevipinnis
Figure 5. – Bar plots showing density of Galaxias brevipinnis larvae per m3 of water in plume, near shore, and off shore sites in large river (left) and small river (right) sites. The Dart River, Reese River, Greenstone River, and Buckler Burn are tributaries of Lake Wakatipu while Makarora River, Matukituki River, Boundary Creek, and Albert Burn are tributaries of Lake Wānaka. No larvae were collected in near shore and off shore samples from Greenstone River.
Figure 3. – Average STRUCTURE results aggregated using CLUMPAK for populations 2–6 and 9. K in Landscape biogeography and population structuring of a facultatively amphidromous galaxiid fish, Galaxias brevipinnis
Figure 3. – Average STRUCTURE results aggregated using CLUMPAK for populations 2–6 and 9. K = 6 was selected as the most likely population estimate using Evanno's method. STRUCTURE initially separated the lakes draining to the east coast (L. Wānaka and L. Wakatipu) from all other sites at K = 2. The West Coast lakes were split away next (K = 3), with L. Moeraki and L. Paringa splitting at K = 4 and L. Cristabel at K = 5. East coast L. Wānaka and L. Wakatipu were split at K = 6. L. Paringa and L. Moeraki are split form each other at K = 9.
Galaxiid_quantitative_review_DATASET_2022
<p>Database of papers published on amphidromous galxiids from 1968-2020.</p>
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.
Figure 2. – A in Landscape biogeography and population structuring of a facultatively amphidromous galaxiid fish, Galaxias brevipinnis
Figure 2. – A: Heat map of FST pairwise comparisons where red represents relatively high FST values approaching 0.15, while white and mauve represent numbers approaching closer to zero. Sites within the same catchment are denoted by a shared letter following site name. Sites located upstream of lakes are denoted by "Lake" prior to site name, whereas all other sites are located downstream of lakes. Coastal creeks and rivers that have no lake or larger catchment affiliation are denoted with "F". B: Scatter plot with trend lines of FST pairwise comparison values (n = 246 total comparisons) and riverine site distance (km), showing lake-lake (cross, dotted line), lake-coast (triangle, dashed line), and coast-coast (circle, solid line) comparisons.
Figure 1. – A in Landscape biogeography and population structuring of a facultatively amphidromous galaxiid fish, Galaxias brevipinnis
Figure 1. – A: Map of New Zealand indicating study regions; B-D: West Coast streams and lakes sampled for returning juvenile kōaro (Galaxias brevipinnis); E: Streams sampled around Lake Wakatipu; F: Streams sampled around Lake Wānaka. Genetic samples and otolith trace element signatures were obtained from fish collected from Buckler Burn, Stony Burn, 25 Mile Creek, 12 Mile Creek, Devil's Staircase Creek and 50 Mile Creek in L. Wakatipu (Panel E), and Alpha Burn, Waterfall Creek, Camp Creek, Boundary Creek, Wharf Creek in L. Wānaka (Panel F). Larval trawling was conducted near Reese River, Dart River Greenstone River, Buckler Burn in L. Wakatipu (panel E), and Makarora River, Matukituki River, Albert Burn and Boundary Creek in L. Wānaka (Panel F).
Allozyme data from Tasmanian galaxiids
<p class="MsoNormal"><strong><span>Context</span></strong><span>. Galaxiids are a widespread, Southern Hemisphere radiation of mostly obligate freshwater fishes. Tasmania houses a diversity of endemic species of <em>Galaxias </em>and <em>Paragalaxias</em>. Of these, many are at risk of extinction, being landlocked, range-restricted, and subject to anthropogenic threats, placing a high conservation priority on the region. </span></p> <p class="MsoNormal"><span><strong>Aim.</strong> Our aim was to synthesize historic and published molecular datasets to provide the sound systematic framework needed to underpin future conservation and taxonomic efforts for Tasmanian galaxiids. </span></p> <p class="MsoNormal"><span><strong>Methods.</strong> Novel and published nuclear (allozyme) and matrilineal (cyt<em>b</em>) datasets were generated and integrated for every putative Tasmanian galaxiid species lacking a comparable multi-gene assessment. </span></p> <p class="MsoNormal"><span><strong>Key results.</strong> The Tasmanian galaxiids are phylogenetically diverse, with molecular data generally supporting the accepted taxonomy, but with potential species-level diversity noted within an alpine radiation of the <em>Galaxias truttaceus </em>complex and further support for synonymy of <em>Galaxias niger </em>within <em>Galaxias brevipinnis</em>. </span></p> <p class="MsoNormal"><span><strong>Conclusions.</strong> This study highlights the value of multi-locus studies in both validating species-level taxonomy and resolving taxonomic ambiguities and conservation priorities within Tasmania's galaxiids. </span></p> <p class="MsoNormal"><span><strong>Implications.</strong> Our integrated genetic analyses provide a framework to underpin more in-depth genomic approaches to assess additional cryptic diversity and conservation planning, such as genetic rescue and <em>ex situ</em> population security.</span></p>
Data from: Molecular phylogenetics and biogeography of galaxiid fishes (Osteichthyes: Galaxiidae): dispersal, vicariance, and the position of Lepidogalaxias salamandroides
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Allozyme data from Tasmanian galaxiids
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Fish length (TL) vs. otolith length (OL) measurements of selected eleotrids and galaxiids from New Zealand; Size classes of fish otolith specimens from early Miocene Manuherikia section, Otago
<p>Supplement data 1 and 2 to: <strong>The “Gulliver” fish fauna of an early Miocene freshwater system of New Zealand; new insights from otoliths from the Bannockburn Formation</strong>, to be published in the New Zealand Journal of Geology (NZJG).</p>
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