Hibuna
Geplaatst: 17-01-2012 11:47
Ferry schreef:ZSjonnie schreef:Hmmm. Dit is helemaal nieuw voor mijHet onderzoek heet:Kingyo schreef:Dat hibuna stukje is ook helemaal nieuw voor mij.
Kun je misschien een link of document posten?
An evolutionary origin and selection process of goldfish
Tomoyoshi Komiyama a, Hiroyuki Kobayashi a, Yoshio Tateno b, Hidetoshi Inoko a,
Takashi Gojobori b,c,⁎, Kazuho Ikeo b,c
a Tokai University School of Medicine, Shimokasuya, Isehara, Kanagawa 259-1193, Japan
b Center for Information Biology and DNA Data Bank of Japan, National Institute of Genetics, Shizuoka, Japan
c SOKENDAI, Department of Genetics, Graduate School of Advanced Studies, Hayama, Japan
Wellicht dat je het via google scholar kunt vinden. Dit is in ieder geval de abstract:
Many different physical characteristics of goldfish (Carassius auratus auratus), such as celestial and telescopic
eyes, fancy but uncontrollable shapes of tail fin, an unfittingly fat body, and loss of dorsal fins, provide us with
a unique opportunity of studying artificial selection on phenotypic changes on the basis of molecular
evolution. The aim of the present study is to elucidate the evolutionary origin and history of goldfish, taking
into account the different characteristics of goldfish and human culture. Collecting 44 samples of a variety of
goldfish from Japan and China as well as common and Crucian carps, we determined the nucleotide
sequences for a substantial portion of mitochondrial genome including eight gene regions (D-loop, 12SrRNA,
16SrRNA, ND1, ND2, COI, ND5 and Cyt b) of approximately 11,180 bps. We, then, constructed phylogenetic
trees for a total of 78 fishes, adding the 19 sequence data available in the international DNA database DDBJ/
EMBL/GenBank to our 59 sequence data determined. From the phylogenetic trees obtained, we found that
Japanese goldfish are not relative to Japanese Crucian carp (Carassius auratus langsdorfi) and that all the
goldfish examined were originated from one of the two groups of the Chinese Crucian carp “Gibelio”
(Carassius auratus gibelio). Moreover, we found that the process of artificial selection began from losing the
dorsal fin followed by diversification of other characters such as eyes. This is supported by our further
observations that the improvement of celestial and telescope eyes took place independently at different
times, implying that goldfish was imposed by strong artificial selection only to meet diversified needs of
human preferences in a unsystematic way.