Abstract:Two new species of Galaxias have overlapping distributions in the lower Taieri River catchment, Otago, although not as yet found in sympatry. Galaxias pullus n.sp. is known from several tributaries of the Waipori River up-and downstream of Lake Mahinerangi, and also from a tributary of the Waitahuna, part of the Clutha River catchment. Galaxias eldoni n.sp. comes from several small tributaries of the lower Taieri near Outram and Middlemarch, from a tributary of the Waipori River below Lake Mahinerangi, from a … Show more
“…Recent molecular and ecological studies have provoked a distinctly changed perspective on the taxonomy of species in the G. vulgaris species complex (Allibone et al 1996;Allibone & Townsend 1997;McDowall 1997a;McDowall & Chadderton 1999;Waters & Wallis 2000. Increased diversity is also evident in the pencil-galaxias complex (McDowall & Waters 2002, 2003.…”
Section: Conclusion: a Biogeographical Synthesismentioning
confidence: 99%
“…10A,B), and several more lineages may require formal recognition McDowall 1997aMcDowall , 2003McDowall & Chadderton 1999;. Most of this diversity is among lineages in the old central/eastern Otago peneplain (Fig.…”
Section: Distribution Patterns Of Non-migratory Freshwater Fishes Asmentioning
confidence: 99%
“…These areas did not suffer major Pleistocene glaciation, so that aquatic habitats were unlikely to have been as severely temperature stressed as in other parts of New Zealand. There would probably have been persistent freshwater habitats in this area-as testified by presence of a significant complex of non-migratory galaxiids across Central Otago, and south into Southland (Allibone et al 1996;McDowall 1997a;Waters & Wallis 2000Waters et al 2001a,b) (Fig. 9).…”
New Zealand's two species of freshwater parastacid crayfishes have allopatric distributions, with one species in the North Island and northwestern South Island and the other in the eastern and southern South Island and Stewart Island. This gives the appearance of a vicariance event driven by uplift of the Southern Alps beginning in the Pliocene, and of former land connections across both Cook Strait and Foveaux Strait. However, separation of the two species may date from before the Southern Alps were formed. A diverse series of historical geological events is invoked to explain details of the distributions of these two species. Absence of Paranephrops from intermontane valleys of eastern flanks of the Southern Alps is notably different from patterns seen in freshwater fish species.
“…Recent molecular and ecological studies have provoked a distinctly changed perspective on the taxonomy of species in the G. vulgaris species complex (Allibone et al 1996;Allibone & Townsend 1997;McDowall 1997a;McDowall & Chadderton 1999;Waters & Wallis 2000. Increased diversity is also evident in the pencil-galaxias complex (McDowall & Waters 2002, 2003.…”
Section: Conclusion: a Biogeographical Synthesismentioning
confidence: 99%
“…10A,B), and several more lineages may require formal recognition McDowall 1997aMcDowall , 2003McDowall & Chadderton 1999;. Most of this diversity is among lineages in the old central/eastern Otago peneplain (Fig.…”
Section: Distribution Patterns Of Non-migratory Freshwater Fishes Asmentioning
confidence: 99%
“…These areas did not suffer major Pleistocene glaciation, so that aquatic habitats were unlikely to have been as severely temperature stressed as in other parts of New Zealand. There would probably have been persistent freshwater habitats in this area-as testified by presence of a significant complex of non-migratory galaxiids across Central Otago, and south into Southland (Allibone et al 1996;McDowall 1997a;Waters & Wallis 2000Waters et al 2001a,b) (Fig. 9).…”
New Zealand's two species of freshwater parastacid crayfishes have allopatric distributions, with one species in the North Island and northwestern South Island and the other in the eastern and southern South Island and Stewart Island. This gives the appearance of a vicariance event driven by uplift of the Southern Alps beginning in the Pliocene, and of former land connections across both Cook Strait and Foveaux Strait. However, separation of the two species may date from before the Southern Alps were formed. A diverse series of historical geological events is invoked to explain details of the distributions of these two species. Absence of Paranephrops from intermontane valleys of eastern flanks of the Southern Alps is notably different from patterns seen in freshwater fish species.
“…The taxonomy of fish populations of the G vulgaris morphotype has recently been extensively re-evaluated using both conventional morphological characters and genetic characters Regarded as just a single, rather variable species since a taxonomic revision by McDowall (1970), the species-group is now considered to include the nominate species, as well as G. anomalus Stokell, G. depressiceps McDowall and Wallis, G. pullus McDowall and G. eldoni McDowall (Allibone et al 1996;McDowall 1997). As reconsidered, G. vulgaris (sensu stricto) is recognised primarily from rivers including and north of the Waitaki River in the eastern and northern South Island, while the four additional species are variously distributed in Otago and Southland, south of the Waitaki (Fig.…”
“…formalin for about a week, washed in fresh water, and stored in 70% ethanol. Adult fish were measured, and counts of meristic characters taken, in conformity with methods used in recent descriptions of new Galaxias species (McDowall 1970(McDowall , 1997McDowall & Wallis 1996). Where possible, because of the small size of the fish (to c. 70 mm), measurements were taken using a lowpowered binocular microscope, and otherwise using an illuminated magnifier.…”
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