{"refrec":{"BRefID":34683,"RR":"<b>Gajardo, G.; Beardmore, J.A.; Sorgeloos, P.</b> (2001). International study on <i>Artemia</i>: 62. Genomic relationships between <i>Artemia franciscana</i> and <i>A. persimilis</i>, inferred from chromocentre numbers. <i>Heredity 87(2)</i>: 172-177","BEntID":34683,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Heredity 87(2)</i>: 172-177","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":1,"TerrestrialFlag":0,"Authorstring":"Gajardo, G.; Beardmore, J.A.; Sorgeloos, P.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Gajardo, G.; Beardmore, J.A.; Sorgeloos, P.","Englishabstract":"Chromocentres, i.e. heavily stainable heterochromatic areas with highly repetitive DNA (a 130-bp repeat in the order of 6 x 10 super(5) copies per haploid genome) observed in the resting nucleus, are a reliable taxonomic trait and a good marker for speciation in <i>Artemia</i>. This chromosome marker was evaluated in populations of two New World sibling species: <i>A. franciscana</i>, from North, Central and South America, and <i>A. persimilis</i> from Argentina. <i>Artemia persimilis</i> showed the characteristically low average chromocentre numbers (<3) of the ancestral Mediterranean species, whilst higher numbers (>5) were seen in <i>A. franciscana</i>. The increase in chromocentre numbers from <i>A. persimilis</i> to <i>A. franciscana</i> occurred in a rather steady, continuous geographical pattern with an overlapping zone between both species. A north-south steady latitudinal decline of chomocentres was observed towards the equator in <i>A. franciscana</i> populations from the northern hemisphere, whilst the trait increased from this point towards southern latitudes with a population in Chilean Patagonia (below 52 degree S) exhibiting the highest chromocentre frequency. Since chromocentres are positively correlated with repetitive DNA content, differentiation between the species through the amplification of heterochromatin or an increased DNA content in <i>A. franciscana</i> (although this species has a lower diploid chromosome number), might nevertheless reflect chromosomal reorganizations between the species. Chromocentres, together with other traits, reveal a probable hybrid zone between the two species in Chilean Patagonia.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"International study on <i>Artemia</i>: 62. Genomic relationships between <i>Artemia franciscana</i> and <i>A. persimilis</i>, inferred from chromocentre numbers","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2025-07-02 08:33:14.980000","timezone_type":1,"timezone":"+00:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":"Speciation; Chromosome number; Repeated sequence; Hybrid zones; Taxonomy; Heterochromatin; Genomes; DNA; Hybrids; Sibling species; Chromosomes; Biological speciation; <i>Artemia franciscana; Artemia persimilis</i>; North America; Central America; South America; Chile, Patagonia","Notes":null,"AnaPub":2001,"MonPub":null,"DateUpdate":"2003-05-12","DateCreate":"2003-05-12","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":0},"refs":null,"anarec":{"AnaID":34683,"PubliDate":2001,"Pagination":"172-177","XtraPublOfAnaID":null,"ISBN":null,"Volume":"87","Issue":"2","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43119,"SerRR":"Heredity. 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