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Dissertations / Theses on the topic 'Galaxiidae'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Mataruse, Gamuchirai. "Phylogeography and conservation of a newly identified galaxiid from the Joubertina area, South Africa." Thesis, Rhodes University, 2013. http://hdl.handle.net/10962/d1003050.

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The dispersal of freshwater fishes in the Cape Floristic Region of South Africa has been attributed to river capture events and confluence of rivers during sea level regression. The role of low drainage divides and inter-basin water transfers have received less attention. A unique lineage of Galaxias zebratus (hereafter the Joubertina galaxias) occurs in two currently isolated river systems, the Gamtoos and Krom. The present study mapped the distribution of the Joubertina galaxias and used mitochondrial and nuclear DNA sequences to assess the processes that could have influenced its current di

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2

Main, Malcolm Richard. "Factors influencing the distribution of kokopu and koaro (Pisces: Galaxiidae)." Thesis, University of Canterbury. Zoology, 1988. http://hdl.handle.net/10092/6900.

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Banded kokopu (Galaxias fasciatus Gray), giant kokopu (G. Argenteus (Gmelin)), short jawed kokopu (G. postvectis Clarke) and koaro (G. Brevipinnis Guenther) (all "large galaxiids") are four species whose juveniles are members of the New Zealand "whitebait" catch. Adult fish occur most often in forested streams, and are rare in (or absent from) poorly-forested regions, such as Canterbury. Four possible reasons for their association with forests (availability of terrestrial invertebrate prey, low maximum temperatures, presence of acidic waters, and presence of favourable microhabitat in forest s

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3

Howard, Simon William. "Flow-related threats to rare galaxiids in the upper Waitaki River." Thesis, University of Canterbury. School of Biological Sciences, 2014. http://hdl.handle.net/10092/9976.

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Human activities are increasingly altering ecosystems, and are especially severe in streams where flow modification can affect environments far downstream and can interact with other pressures, such as species invasions. This has led to a disproportionately high number of threatened species in streams (e.g., native galaxiid fishes in New Zealand). I investigated how threatened bignose galaxias (Galaxias macronasus) and upland longjaw galaxias (Galaxias prognathus) were affected by flow-related influences in their habitats. A survey of sub-catchments in the Mackenzie Basin showed that flow regu

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4

au, fishyboy@optusnet com, and Andrew Chapman. "Biology of the Spotted Minnow, Galaxias maculatus (Jenyns 1842) (Pisces: Galaxiidae) on the South Coast of Western Australia." Murdoch University, 2003. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20041029.92331.

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The spotted minnow, Galaxias maculatus has a widespread southern hemisphere and circum-polar distribution including south-western and south-eastern Australia. It was sampled at monthly intervals over 12-18 months, by seine and plankton netting at three localities including a freshwater lake, Moates Lake, and two intermittently flowing, naturally saline rivers, the Jerdacuttup and the Oldfield rivers on the south coast of Western Australia. The resulting data provided an opportunity to describe the biology of G. maculatus in some detail including; environmental variables, life cycle, larval de

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5

Chapman, Andrew. "Biology of the spotted minnow Galaxias maculatus (Jenyns 1842) (Pisces: Galaxiidae) on the south coast of Western Australia." Thesis, Chapman, Andrew (2003) Biology of the spotted minnow Galaxias maculatus (Jenyns 1842) (Pisces: Galaxiidae) on the south coast of Western Australia. Masters by Research thesis, Murdoch University, 2003. https://researchrepository.murdoch.edu.au/id/eprint/650/.

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The spotted minnow, Galaxias maculatus has a widespread southern hemisphere and circum-polar distribution including south-western and south-eastern Australia. It was sampled at monthly intervals over 12-18 months, by seine and plankton netting at three localities including a freshwater lake, Moates Lake, and two intermittently flowing, naturally saline rivers, the Jerdacuttup and the Oldfield rivers on the south coast of Western Australia. The resulting data provided an opportunity to describe the biology of G. maculatus in some detail including; environmental variables, life cycle, larval

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6

Chapman, Andrew. "Biology of the spotted minnow Galaxias maculatus (Jenyns 1842) (Pisces: Galaxiidae) on the south coast of Western Australia." Chapman, Andrew (2003) Biology of the spotted minnow Galaxias maculatus (Jenyns 1842) (Pisces: Galaxiidae) on the south coast of Western Australia. Masters by Research thesis, Murdoch University, 2003. http://researchrepository.murdoch.edu.au/650/.

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The spotted minnow, Galaxias maculatus has a widespread southern hemisphere and circum-polar distribution including south-western and south-eastern Australia. It was sampled at monthly intervals over 12-18 months, by seine and plankton netting at three localities including a freshwater lake, Moates Lake, and two intermittently flowing, naturally saline rivers, the Jerdacuttup and the Oldfield rivers on the south coast of Western Australia. The resulting data provided an opportunity to describe the biology of G. maculatus in some detail including; environmental variables, life cycle, larval

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7

Galeotti, David M. "Metapopulation theory explains Black-stripe Minnow (Pisces: Galaxiidae, Galaxiella nigrostriata) distribution in seasonal wetlands in south-west Western Australia." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2013. https://ro.ecu.edu.au/theses/708.

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The objective of this project was to determine if Galaxiella nigrostriata populations could belong to a metapopulation. Metapopulation theory describes how multiple populations with occasional connectivity are a ‘population of populations’. Some populations’ habitats have optimal conditions (source habitats), others experience regular extinctions (sink habitats). Connectivity allows repopulation of extinct or uninhabited habitats. Galaxiella nigrostriata occurred randomly in 11 seasonal wetlands in the Kemerton wetland complex in south-west Western Australia over a 16 year period. The wetlands

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8

Howard, Simon William. "Effects of trout on galaxiid growth and antipredator behaviour." Thesis, University of Canterbury. Biological Sciences, 2007. http://hdl.handle.net/10092/1438.

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The introduction of trout has been implicated in the declines in native fish fauna in New Zealand and worldwide. Since the introduction of brown (Salmo trutta) and rainbow (Oncorhynchus mykiss) trout to New Zealand in 1867, their distribution has spread and they have been implicated in the fragmentation of native fish distributions, particularly native non-migratory galaxiids. However, in the Upper Waimakariri basin the co-occurrence of trout and galaxiid populations is relatively common, even in streams where trout reach sizes known to be piscivorous. To investigate mechanisms that may regula

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9

Woodford, Darragh J. "Riverscape-mediated effects of introduced trout on non-diadromous galaxiid fishes in New Zealand." Thesis, University of Canterbury. Biological Sciences, 2009. http://hdl.handle.net/10092/3284.

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The impact of invasive predators on native prey may depend on the availability and distribution of invader-free refugia across landscapes, if predators create demographic ‘sink’ populations in invaded patches, giving rise to source-sink dynamics in prey populations. Propagule pressure of immigrants dispersing from refugia (or sources) may consequently drive persistence in sink habitat, affecting predator-prey co-existence across the landscape. I studied whether introduced brown (Salmo trutta) and rainbow trout (Oncorhynchus mykiss) create source-sink structuring in two native galaxiid fish spe

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10

Crow, Shannan Kyle, and n/a. "Evolutionary ecology of non-diadromous galaxiid fishes (Galaxias gollumoides and G. �southern�) in Southern New Zealand." University of Otago. Department of Zoology, 2008. http://adt.otago.ac.nz./public/adt-NZDU20081124.095647.

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Coexisting species are interesting from evolutionary and ecological perspectives. Sympatry can provide insights into mechanisms that allow stable long-term coexistence, such as niche partitioning, character displacement, interspecific competition and species boundaries. In New Zealand streams, a flock of closely related non-migratory galaxiid fishes exist throughout eastern South Island (Galaxias vulgaris sensu lato). These fishes are largely parapatric, but recent studies have found streams that contain coexisting populations of two newly discovered galaxiids (Galaxias �southern� and G. gollu

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11

Stuart-Smith, RD. "The importance of complex habitats for the predator-prey interaction between a threatened galaxiid fish and introduced salmonid." Thesis, 2007. https://eprints.utas.edu.au/22200/1/whole_Stuart-SmithRichardDuncan2007_thesis.pdf.

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Theoretically, there are a number of ways in which predator and prey can co-exist, including temporal and spatial partitioning and the presence and use of refuge habitats by prey. Whilst these factors have been shown to promote co-existence in well-studied, co-evolved predator and prey pairs, there has been a lack of applied research into how predator-prey theory fits when predators are introduced species. Understanding the mechanisms behind the success, or lack of, by native species when predators have been introduced, thus requires knowledge of whether the same factors promote co-existence,

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12

Hardie, SA. "Conservation biology of the Golden Galaxias (Galaxias auratus)(Pisces: Galaxiidae)." Thesis, 2007. https://eprints.utas.edu.au/7311/2/01front_HardieSA.pdf.

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Freshwater fishes are increasingly being considered threatened at regional (Bruton, 1990; Moyle, 1995; Fu et al., 2003) and international (Cambray & Giorgio Bianco, 1998) levels. In order to maintain their associated fishery resources, aquatic biodiversity, and the health of the systems which they inhabit, freshwater fish conservation has been recognised as an important action globally (Lowe-McConnell, 1990; Cowx & Collares-Pereira, 2002). A broad range of threats, which are mostly linked to anthropogenic impacts and biological invasions, increase the vulnerability of fishes (Bruton, 199

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13

Hardie, SA. "Conservation biology of the Golden Galaxias (Galaxias auratus)(Pisces: Galaxiidae)." 2007. http://eprints.utas.edu.au/7311.

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Freshwater fishes are increasingly being considered threatened at regional (Bruton, 1990; Moyle, 1995; Fu et al., 2003) and international (Cambray & Giorgio Bianco, 1998) levels. In order to maintain their associated fishery resources, aquatic biodiversity, and the health of the systems which they inhabit, freshwater fish conservation has been recognised as an important action globally (Lowe-McConnell, 1990; Cowx & Collares-Pereira, 2002). A broad range of threats, which are mostly linked to anthropogenic impacts and biological invasions, increase the vulnerability of fishes (Bruton, 199

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14

Waters, JM. "Aspects of the phylogeny, biogeography and taxonomy of galaxioid fishes." Thesis, 1997. https://eprints.utas.edu.au/22322/1/whole_WatersJonathanMichael1996_thesis.pdf.

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This study used two distinct methods to infer phylogenetic relationships of members of the Galaxioidea. The first approach involved direct sequencing of mitochondrial DNA to produce a molecular phylogeny. Secondly, a thorough osteological study of the galaxiines was the basis of a cladistic analysis to produce a morphological phylogeny. Phylogenetic analysis of 303 base pairs of mitochondrial cytochrome b _supported the monophyly of Neochanna, Paragalaxias and Galaxiella. This gene also reinforced recognised groups such as Galaxias truttaceus-G. auratus and G. fasciatus-G. argenteus. In a pr

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15

Pavuk, NC. "Population genetics of selected whitebait species : Galaxias maculatus (Jenyns) and Lovettia sealii (Johnston)." Thesis, 1997. https://eprints.utas.edu.au/17426/1/whole-pavuk-thesis.pdf.

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Population Genetics of Selected Whitebait Species: Galaxias maculatus (Jenyns) and Lovettia sealii (Johnston). Populations of diadromous G. maculatus and anadromous L. sealii fishes have been studied for genetic variation by cellulose acetate electrophoresis. L. sealii is a small member of the family Aplochitonidae endemic to Tasmania. In contrast, G. maculatus a salmoniform fish of the Family Galaxiidae, is found throughout the southern temperate zone (Australia, New Zealand and South America). Together these species are the predominant components of Tasmanian whitebait. A significant

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16

Ybazeta, Gustavo. "Moleculary Systematics and Biogeography of the Galaxidae." Thesis, 2012. http://hdl.handle.net/1807/65494.

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To test competing hypotheses about the relative roles of vicariance and dispersal in the freshwater fishes in Galaxiidae, a phylogenetic framework and a time scale for species divergence were estimated using mitochondrial and nuclear DNA sequences. Relaxed clock dating revealed that the Galaxiidae originated in Gondwana in the late Cretaceous and thus vicariance cannot be ruled out for the two basal lineages, Galaxiella and Brachygalaxias. These two lineages are ancient relicts that rafted to their present distributions or were fragmented by the separation of Australia from South America via

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17

Zemlak, Tyler Stephen. "THE INFLUENCES OF QUATERNARY PROCESSES ON NATIVE FRESHWATER DIVERSITY IN PATAGONIA: MOLECULAR INSIGHTS FROM THE GALAXIID FISHES." 2011. http://hdl.handle.net/10222/13790.

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Using GIS-based tools and a review of the relevant geological and climatic literature, I attempt to identify the key implications of Quaternary glacial cycles for drainage evolution in eastern Patagonia. In doing so, the stage is set for the proper integration of existing biogeographic and phylogeographic ideas to develop a suite of inferences aimed at elucidating how these processes influenced aquatic biodiversity of Patagonian Argentina. A primary finding of this research is that the southern mainland and/or Tierra del Fuego served as an important cryptic refuge for cold-adapted species, i

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18

Howard, S. W. "Effects of trout on galaxiid growth and antipredator behaviour : a thesis submitted in partial fulfilment of the requirements for the degree of Master of Science in Ecology in the University of Canterbury /." 2007. http://library.canterbury.ac.nz/etd/adt-NZCU200711.

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