Linked Life Data

16592642

Source:http://linkedlifedata.com/resource/pubmed/id/16592642

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
2010-6-29
pubmed:abstractText
Search for genetic changes that are pivotal in species formation has led to intraspecific studies of Drosophila silvestris, a giant species found only on the geologically new island of Hawaii. Males bear large, curved, modified bristles or cilia on the dorsal surface of the foreleg tibia and tarsus. In males from the south and west parts of the island there are two rows of cilia separated by a naked area, but in males from the north and east there is a mean of between 20 and 30 additional cilia between the two major rows on the tibia. These extra cilia are absent in closely related species of this subgroup, including the sympatric species D. heteroneura and three species from adjacent islands. Males use the foreleg tibiae in vibratory movements against the female's abdomen during courtship, so this character difference is likely to be important in the reproductive biology of the species. Inversion polymorphisms are similar in both northeast and southwest populations; they show large and strikingly parallel altitudinal shifts in frequency distributions involving the same inversions. Populations from various parts of the island cannot be distinguished by routine electrophoresis of soluble proteins encoded by 25 loci. Thus the "extra cilia" character is superimposed on a more ancient genetic background of similarity involving both chromosomal and electrophoretic polymorphisms. We interpret the extra cilia as a specific new embellishment of a secondary sexual character brought about by altered sexual selection occurring very recently in one part of the species range. This suggests incipient speciation.
pubmed:commentsCorrections
pubmed:language
eng
pubmed:journal
pubmed:status
PubMed-not-MEDLINE
pubmed:month
Apr
pubmed:issn
0027-8424
pubmed:author
pubmed:issnType
Print
pubmed:volume
76
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1929-32
pubmed:dateRevised
2010-9-15
pubmed:year
1979
pubmed:articleTitle
Change in a secondary sexual character as evidence of incipient speciation in Drosophila silvestris.
pubmed:affiliation
Department of Genetics, University of Hawaii, Honolulu, Hawaii 96822.
pubmed:publicationType
Journal Article