Geographic Variations in Survival of Hybrids Between Etheostomatine Fishes

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dc.creatorHubbs, Clarken
dc.date.accessioned2015-05-14T21:03:34Zen
dc.date.available2015-05-14T21:03:34Zen
dc.date.issued1967-07en
dc.descriptionTable of Contents: Abstact -- Introduction -- Methods -- Species Involved -- Hybrid Fertility -- Interpopulation-Intraspecific Hybridization -- Intrageneric Etheostoma Hybrids -- Interspecific Hybrids of Primitive Darters -- Hybrids Between Primitive and Advanced Darters -- Discussion -- Acknowledgments -- Literature Citeden
dc.description.abstractComparative analyses of more than 500,000 darter eggs variously tested for fertility and viability from 1954 to 1965, and gathered from widely separated geographic locations, showed that darter hybrids were as viable as or more viable than the controls. Both reciprocals of 70 hybrid combinations were reared and more than 60 additional combinations had one reciprocal reared. Eggs were able to inhibit the activity of heterospecific sperm, especially after it had expended about one half its normal activity period; an inhibition obviously designed to reduce the effect of chance meeting of gametes in the water. Several patterns of differential survival were noted, all associated with decreased hybridization potential in sympatry. Included were the first example of postmating reinforcement of isolation mechanisms, and an example of reinforcement being masked by more significant behavioral isolation. Several hybrid combinations had more viable hybrids in one reciprocal than in the other, always occurring where one parent had a high laboratory survival and the other was difficult to rear. All examples were maternally influenced. Relative fecundity studies show that the darters in areas with many species have more and smaller eggs than equal sized females in the peripheral areas where few darter species occur.en
dc.description.departmentTexas Memorial Museumen
dc.identifier.Filenametmm-bulletin-13.pdfen
dc.identifier.Filenametmm-bulletin-13.txten
dc.identifier.issn0082-3074en
dc.identifier.urihttp://hdl.handle.net/2152/29936en
dc.language.isoengen
dc.publisherTexas Memorial Museum, The University of Texas at Austinen
dc.relation.ispartofseriesThe Bulletin of the Texas Memorial Museum; no. 13en
dc.subjectIchthyologyen
dc.subjectNorth America -- United States -- Texas -- Oklahoma; Arkansas --Missourien
dc.subjectActinopterygiien
dc.subjectPercidaeen
dc.subjectEtheostomaen
dc.subjectPercinaen
dc.subjectHadropterus; Ammocrypta vivaxen
dc.subjectEtheostoma asprigeneen
dc.subjectEtheostoma blennioidesen
dc.subjectEtheostoma caeruleumen
dc.subjectEtheostoma chlorosomaen
dc.subjectEtheostoma euzonaen
dc.subjectEtheostoma flabellareen
dc.subjectEtheostoma fonticolaen
dc.subjectEtheostoma gracileen
dc.subjectEtheostoma grahamien
dc.subjectEtheostoma juliaeen
dc.subjectEtheostoma lepidumen
dc.subjectEtheostoma micropercaen
dc.subjectEtheostoma nianguaeen
dc.subjectEtheostoma nigrumen
dc.subjectEtheostoma proeliareen
dc.subjectEtheostoma punctulatumen
dc.subjecthybridizationen
dc.subjectreproductive isolation mechanismsen
dc.subjectfecundity; life historyen
dc.subjectheterosisen
dc.subjecthybrid fertilityen
dc.titleGeographic Variations in Survival of Hybrids Between Etheostomatine Fishesen
dc.typeTechnical reporten

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