Abstract
Central Otago (New Zealand) was the focus of an intense period ofgold mining in the late 19th century. Mining relied on high waterpressure for sluicing, often requiring extensive systems of water raceslinking headwaters over large distances. On Rough Ridge, races connectedheadwaters of Otago's two major river systems, the Taieri and theClutha. We employed genetic analysis of freshwater fish(Galaxias) populations to assess the biological implications ofrace-development. The two galaxiid taxa found on Rough Ridge (G. spD and G. depressiceps) are reciprocally monophyletic formtDNA and have three fixed allozyme differences. Rough Ridge aside,G. sp D is apparently absent from the Taieri system and G.depressiceps from the Clutha system. Distributions of mitochondrialDNA, allozyme and microsatellite alleles imply that artificialconnections have facilitated bidirectional introgression: movementof G. sp D alleles into the Taieri system and G.depressiceps alleles into the Clutha. The finding of some identicalcontrol region haplotypes (of both lineages) on either side of thecatchment boundary confirms the recency of genetic exchange. Near theinferred region of contact, samples from Linn Burn (Taieri) are pureG. depressiceps for three diagnostic allozymes and mtDNA.Samples from upper Pool Burn (Clutha) are pure G. sp D forthese same four markers. However, other collections from around thecontact zone represent genetic mixtures forming a cline. We fear thatsimilar human-induced mixing may have happened elsewhere in uplandOtago.
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References
Allendorf FW, Leary RF (1988) Conservation and distribution of genetic variation in a polytypic species, the cutthroat trout. Conserv. Biol., 2, 170-184.
Allibone RM (1997) Freshwater Fish of the Otago Region. Otago Conservancy, New Zealand Department of Conservation.
Allibone RM (2000) Water abstraction impacts on the nonmigratory galaxiids of Totara Creek. Science for Conservation, 147B, 25-45 (New Zealand Department of Conservation).
Allibone RM, Crowl TA, Holmes JM, King TM, McDowall RM, Townsend CR, Wallis GP (1996) Isozyme analysis of Galaxias species (Teleostei: Galaxiidae) from the Taieri River, South Island, New Zealand: A species complex revealed. Biol. J. Linn. Soc., 50, 107-127.
Arnold ML (1997) Natural Hybridization and Evolution. Oxford University Press, Oxford.
Avise JC (1994) Molecular Markers, Natural History and Evolution. Chapman & Hall, New York.
Avise JC, Hamrick JL (1996) Conservation Genetics. Case Histories from Nature. Chapman & Hall, New York.
Avise JC, Saunders NC (1984) Hybridization and introgression among species of sunfish (genus Lepomis): Analysis by mitochondrial and allozyme markers. Genetics, 108, 237-255.
Aviss, M (1995) The Department of Conservation' Management of Hybridisation-a Discussion Paper. New Zealand Department of Conservation, Wellington.
Bartley DM, Gall GAE (1991) Genetic identification of native cutthroat trout (Oncorhynchus clarki) and introgressive hybridization with introduced rainbow trout (O. mykiss) in streams associated with the Alvord Basin, Oregon and Nevada. Copeia, 8, 854-859.
Barton NH, Hewitt GM (1985) Analysis of hybrid zones. Annu. Rev. Ecol. Syst., 16, 113-148.
Bert TM, Harrison RG (1988) Hybridization in western Atlantic stone crabs (genus Menippe): Evolutionary history and ecological context influence species interactions. Evolution, 42, 528-544.
Chenoweth SF, Hughes JM, Keenan CP, Lavery S (1998) When oceans meet: A teleost shows secondary intergradation at an Indian-Pacific interface. Proc. R. Soc. Lond. B, 265, 415-420.
Childs MR, Echelle AA, Dowling TE (1996) Development of the hybrid swarm between Pecos pupfish (Cyprinodon variegatus): A perspective from allozymes and mtDNA. Evolution, 50, 2014-2022.
DeMarais BD, Dowling TE, Douglas ME, Minckley WL, Marsh PC (1992) Origin of Gila seminuda (Teleostei: Cyprinidae) through introgressive hybridization: Implications for evolution and conservation. Proc. Natl. Acad. Sci. USA, 89, 2747-2751.
Dowling TE, Childs MR (1992) Impact of hybridization on a threatened trout of the southwestern United States. Conserv. Biol., 6, 55-364.
Dowling TE, Secor TL (1997) The role of hybridization and introgression in the diversification of animals. Ann. Rev. Ecol. Syst., 28, 593-619.
Dowling TE, Smith GR, Brown WM (1989) Reproductive isolation and introgression between Notropis cornutus and Notropis chrysocephalus (Family Cyprinidae): Comparison of morphology, allozymes and mitochondrial DNA. Evolution, 43, 620-634.
Duvernell DD, Aspinwall N (1995) Introgression of Luxilus cornutus mtDNA into allopatric populations of Luxilus chrysocephalus (Teleostei: Cyprinidae) in Missouri and Arkansas. Mol. Ecol., 4, 173-181.
Echelle AF, Echelle AA (1994) Assessment of genetic introgression between two pupfish species, Cyprinodon elegans and C. variegatus (Cyprinidontidae), after more than 20 years of secondary contact. Copeia, 1994, 590-597.
Echelle AA, Echelle AF (1997) Genetic introgression of endemic taxa by non-natives: A case study with Leon Springs pupfish and sheepshead minnow. Conserv. Biol., 11, 153-161.
Ellstrand NC (1992) Gene flow by pollen: implications for plant conservation genetics. Oikos, 63, 77-86.
Felsenstein J (1985) Confidence limits on phylogenies: An approach using the bootstrap. Evolution, 39, 783-791.
Fergus C (1991) The Florida panther verges on extinction. Science, 251, 1178-1180.
Forbes SH, Allendorf FW (1991) Mitochondrial genotypes have no detectable effects on meristic traits in cutthroat trout hybrid swarms. Evolution, 45, 1350-1359.
Glasson HA (1959) The Golden Cobweb: A Saga of the Otago Goldfields. The Otago Daily Times, Dunedin.
Goudet J (1995) FSTAT (version 1.2): A computer program to calculate F-statistics. J. Hered., 86, 485.
Grewe PM, Krueger CC, Aquadro CF, Bermingham E, Kincaid HL, May B (1993) Mitochondrial variation among lake trout (Salvelinus namaycush) strains stocked into Lake Ontario. Can. J. Fish. Aquat. Sci., 50, 2397-2403.
Gyllensten U, Leary RF, Allendorf FW, Wilson AC (1985) Introgression between two cutthroat subspecies with substantial karyotypic, nuclear and mitochondrial genomic divergence. Genetics, 111, 905-915.
Harris H, Hopkinson DA (1976) Handbook of Enzyme Electrophoresis in Human Genetics. North-Holland Publication Company, Amsterdam. Harrison RG (1993) Hybrid Zones and the Evolutionary Process. Oxford University Press, Oxford.
Harrison RG, Bogdanowicz SM (1997) Patterns of variation and linkage disequilibrium in a field cricket hybrid zone. Evolution, 51, 493-505.
Hasegawa M, Kishino H, Yano T (1985) Dating of the human-ape splitting by a molecular clock of mitochondrial DNA. J. Mol. Evol., 22, 160-174.
Hayes JP, Guffey SZ, Kriegler FJ, McCracken GF, Parker CR (1996) The genetic diversity of native, stocked, and hybrid populations of brook trout in the southern Appalachians. Conserv. Biol., 10, 1403-1412.
Hebert PDN, Beaton MJ (1989) Methodologies for Allozyme Analysis Using Cellulose Acetate Electrophoresis. A Practical Handbook. Helena Laboratories, Beaumont, Texas.
Hubbs CL (1955) Hybridization between fish species in nature. Syst. Zool., 4, 1-20.
King TM, Wallis GP (1998) Fine-scale genetic structuring in endemic galaxiid fish populations of the Taieri River. N. Z. J. Zool., 25, 17-22.
Lewontin RC, Birch LC (1966) Hybridization as a source of variation for adaptation to new environments. Evolution, 20, 315-336.
McDowall RM (1997) Two further new species of Galaxias (Teleostei: Galaxiidae) from the Taieri River, southern New Zealand. J. R. Soc. N. Z., 27, 199-217.
McDowall RM, Chadderton WL (1999) Galaxias gollumoides (Teleostei: Galaxiidae), a new fish species from Stewart Island, with notes on other non-migratory freshwater fishes present on the island. J. R. Soc. N. Z., 29, 77-88.
McDowall RM, Wallis GP (1996) Description and redescription of Galaxias species (Teleostei: Galaxiidae) from Otago and Southland. J. R. Soc. N. Z., 26, 401-427.
McLintock AH (1949) The History of Otago: The Origins and Growth of a Wakefield Class Settlement. Otago Centennial Historical Publications, Wellington.
Minckley WL (1978) Endemic fishes of the Cuatro Cienegas basin, northern Coahuila, Mexico. In: Transactions of the Symposium on the Biological Resources of the Chihuahuan Desert Region, United States and Mexico. National Park Service Transactions and Proceedings Series 3 (eds. Waur RH, Riskind D), pp. 383-404. US Department of the Interior, Washington, DC.
Moritz C (1994) Defining ‘Evolutionarily Significant Units’ for conservation. Trends. Ecol. Evol., 9, 373-375.
Murray JS, Murray RW (1978) Costly Gold: Clutha Riches and Their Human Toll. Reed AH and AW, Wellington.
Nielsen JL (1995) Evolution and the Aquatic Ecosystem: Defining Unique Units in Population Conservation. American Fisheries Society Symposium 17. American Fisheries Society, Bethesda.
Nielsen JL, Tupper D, Thomas WK (1994) Mitochondrial DNA polymorphism in unique runs of chinook salmon (Oncorhynchus tshawytscha) from the Sacramento-San Joaquin basin. Conserv. Biol., 8, 82-884.
O'Brien SJ, Mayr E (1991) Bureaucratic mischief: recognizing endangered species and subspecies. Science, 251, 1187-1188.
Raymond M, Rousset F (1997) GENEPOP (version 3.1b): Population genetics software for exact tests and ecumenicism. J. Hered., 86, 248-249.
Rhymer JM, Simberloff D (1996) Extinction by hybridization and introgression. Annu. Rev. Ecol. Syst., 27, 83-109.
Rice WR (1989). Analyzing tables of statistical tests. Evolution, 43, 223-225.
Sang T-K, Chang H-Y, Chen C-T, Hui C-F (1994) Population structure of the Japanese eel, Anguilla japonica. Mol. Biol. Evol., 11, 250-260.
Shaw CR, Prasad R (1968) Starch gel electrophoresis of enzymes: A compilation of recipes. Biochem. Genet., 4, 297-320.
Shoemaker DD, Kenneth GR, Arnold ML (1996) Genetic structure and evolution of a fire ant hybrid zone. Evolution, 50, 1958-1976.
Swofford DL (1998) Phylogenetic Analysis Using Parsimony (and other methods) PAUP Version 4.0b4. Sinauer Associates, Sunderland, Massachusetts.
Szymura JM, Barton NH (1986) Genetic analysis of a hybrid zone between the fire-bellied toads, Bombina bombina and B. variegata, near Cracow in southern Poland. Evolution, 40, 1141-1159.
Templeton AR (1986) Coadaptation and outbreeding depression. In: Conservation Biology: the Science of Scarcity and Diversity (ed. Soulé ME), pp. 105-116. Sinauer Associates, Sunderland, Massachusetts.
Townsend CR, Crowl TA (1991) Fragmented population structure in a native New Zealand fish: An effect of introduced brown trout? Oikos, 61, 347-354.
Verspoor E, Hammar J (1991) Introgressive hybridization in fishes: The biochemical evidence. J. Fish Biol., 39, 309-334.
Vogler AP, DeSalle R (1994) Diagnosing units of conservation management. Conserv. Biol., 8, 354-363.
Wallis GP (1994) Population genetics and conservation in New Zealand: A hierarchical synthesis and recommendations for the 1990s. J. R. Soc. N. Z., 24, 143-160.
Wallis GP, Judge KF, Bland J, Waters JM, Berra TM (2001) Genetic diversity in New Zealand Galaxias vulgaris sensu lato (Teleostei: Galaxiidae): A test of a biogeographic hypothesis. J. Biogeogr., 28, in press.
Waters JM, Esa YB, Wallis GP (1999) Characterization of microsatellites from a New Zealand freshwater fish (Galaxias vulgaris) and their potential for analysis of hybridization in Galaxiidae. Mol. Ecol., 8, 1080-1082.
Waters JM, Wallis GP (2000) Across the Southern Alps by river capture? Freshwater fish phylogeography in South Island, New Zealand. Mol. Ecol., 9, 1577-1582.
Waters JM, Wallis GP (2001) Mitochondrial DNA phylogenetics of the Galaxias vulgaris complex from South Island, New Zealand: rapid radiation of a species flock. J. Fish Biol., 57, in press.
Weir BS, Cockerham CC (1984) Estimation of F-statistics for the analysis of population structure. Evolution, 38, 1358-1370.
Wilde GR, Echelle AA (1992) Genetic status of pecos pupfish populations after establishment of a hybrid swarm involving an introduced congener. Trans. Am. Fish. Soc., 121, 227-286.
Wilson CC, Bernatchez L (1998) The ghost of hybrids past: Fixation of arctic charr (Salvelinus alpinus) mitochondrial DNA in an introgressed population of lake trout (S. namaycush). Mol. Ecol., 7, 127-132.
Woodruff DS (1989) Genetic anomalies associated with Cerion hybrid zones: The origin and maintenance of new electromorphic variants called hybrizymes. Biol. J. Linn. Soc., 36, 281-294.
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Esa, Y., Waters, J. & Wallis, G. Introgressive hybridization between Galaxias depressiceps and Galaxias sp D (Teleostei: Galaxiidae) in Otago, New Zealand: Secondary contact mediated by water races. Conservation Genetics 1, 329–339 (2000). https://doi.org/10.1023/A:1011511418644
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DOI: https://doi.org/10.1023/A:1011511418644