Genic Identity and Geographic Differentiation of Trophically Dichotomous Ilyodon (Teleostei: Goodeidae)
Allozyme survey of 15 polymorphic loci in four Ilyodon populations from a tributary of the Río Coahuayana, Jalisco, Mexico, revealed marked interlocality populational differences, but striking within-locality similarities between two trophic morphotypes which once were considered different species....
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| Veröffentlicht in: | Copeia 1984-01, Vol.1984 (1), p.102-107 |
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| container_title | Copeia |
| container_volume | 1984 |
| creator | Grudzien, Thaddeus A. Turner, Bruce J. |
| description | Allozyme survey of 15 polymorphic loci in four Ilyodon populations from a tributary of the Río Coahuayana, Jalisco, Mexico, revealed marked interlocality populational differences, but striking within-locality similarities between two trophic morphotypes which once were considered different species. The observed level of geographic variation was unusually high for a continuously distributed population. The differentiation may be the result of genetic drift due to periodic bottleneck effects in small tributaries, but natural selection cannot be ruled out. Regardless of the basis of the geographic differentiation, it is doubtful that two independent gene pools could display genic concordance at all polymorphic loci. Thus, gene flow seems to be maintaining allozymic identity of the two morphs at each locality. Previous suggestions that the morphs are conspecific are substantially supported. |
| doi_str_mv | 10.2307/1445040 |
| format | Article |
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The observed level of geographic variation was unusually high for a continuously distributed population. The differentiation may be the result of genetic drift due to periodic bottleneck effects in small tributaries, but natural selection cannot be ruled out. Regardless of the basis of the geographic differentiation, it is doubtful that two independent gene pools could display genic concordance at all polymorphic loci. Thus, gene flow seems to be maintaining allozymic identity of the two morphs at each locality. Previous suggestions that the morphs are conspecific are substantially supported.</description><identifier>ISSN: 0045-8511</identifier><identifier>EISSN: 1938-5110</identifier><identifier>DOI: 10.2307/1445040</identifier><identifier>CODEN: COPAAR</identifier><language>eng</language><publisher>Lawrence, KS: American Society of Ichthyologists and Herpetologists</publisher><subject>Alleles ; Animals ; Biological and medical sciences ; Ecological genetics ; Evolutionary genetics ; Fish ; Fundamental and applied biological sciences. Psychology ; Gene flow ; Gene frequency ; Genetic loci ; Genetics of eukaryotes. 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The observed level of geographic variation was unusually high for a continuously distributed population. The differentiation may be the result of genetic drift due to periodic bottleneck effects in small tributaries, but natural selection cannot be ruled out. Regardless of the basis of the geographic differentiation, it is doubtful that two independent gene pools could display genic concordance at all polymorphic loci. Thus, gene flow seems to be maintaining allozymic identity of the two morphs at each locality. Previous suggestions that the morphs are conspecific are substantially supported.</description><subject>Alleles</subject><subject>Animals</subject><subject>Biological and medical sciences</subject><subject>Ecological genetics</subject><subject>Evolutionary genetics</subject><subject>Fish</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>Gene flow</subject><subject>Gene frequency</subject><subject>Genetic loci</subject><subject>Genetics of eukaryotes. 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Psychology</topic><topic>Gene flow</topic><topic>Gene frequency</topic><topic>Genetic loci</topic><topic>Genetics of eukaryotes. Biological and molecular evolution</topic><topic>Geographical variation</topic><topic>Heterozygotes</topic><topic>Population genetics</topic><topic>Population genetics, reproduction patterns</topic><toplevel>online_resources</toplevel><creatorcontrib>Grudzien, Thaddeus A.</creatorcontrib><creatorcontrib>Turner, Bruce J.</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><jtitle>Copeia</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Grudzien, Thaddeus A.</au><au>Turner, Bruce J.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Genic Identity and Geographic Differentiation of Trophically Dichotomous Ilyodon (Teleostei: Goodeidae)</atitle><jtitle>Copeia</jtitle><date>1984-01-01</date><risdate>1984</risdate><volume>1984</volume><issue>1</issue><spage>102</spage><epage>107</epage><pages>102-107</pages><issn>0045-8511</issn><eissn>1938-5110</eissn><coden>COPAAR</coden><abstract>Allozyme survey of 15 polymorphic loci in four Ilyodon populations from a tributary of the Río Coahuayana, Jalisco, Mexico, revealed marked interlocality populational differences, but striking within-locality similarities between two trophic morphotypes which once were considered different species. The observed level of geographic variation was unusually high for a continuously distributed population. The differentiation may be the result of genetic drift due to periodic bottleneck effects in small tributaries, but natural selection cannot be ruled out. Regardless of the basis of the geographic differentiation, it is doubtful that two independent gene pools could display genic concordance at all polymorphic loci. Thus, gene flow seems to be maintaining allozymic identity of the two morphs at each locality. Previous suggestions that the morphs are conspecific are substantially supported.</abstract><cop>Lawrence, KS</cop><pub>American Society of Ichthyologists and Herpetologists</pub><doi>10.2307/1445040</doi><tpages>6</tpages></addata></record> |
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| ispartof | Copeia, 1984-01, Vol.1984 (1), p.102-107 |
| issn | 0045-8511 1938-5110 |
| language | eng |
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| source | JSTOR Archive Collection A-Z Listing |
| subjects | Alleles Animals Biological and medical sciences Ecological genetics Evolutionary genetics Fish Fundamental and applied biological sciences. Psychology Gene flow Gene frequency Genetic loci Genetics of eukaryotes. Biological and molecular evolution Geographical variation Heterozygotes Population genetics Population genetics, reproduction patterns |
| title | Genic Identity and Geographic Differentiation of Trophically Dichotomous Ilyodon (Teleostei: Goodeidae) |
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