Selection, outbreeding depression, and the sex ratio of scale insects [Nuculaspis californica]

The black pineleaf scale insect has haploid males and diploid females. Ratios of males to females late in development ranged from 0.005 to 0.320 among insect subpopulations that were infesting different host trees. Demes well adapted to an individual ponderosa pine had a higher proportion of males t...

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Bibliographic Details
Published in:	Science (American Association for the Advancement of Science) Vol. 220; no. 4592; pp. 93 - 95
Main Authors:	Alstad, D. N., Edmunds, G. F.
Format:	Journal Article
Language:	English
Published:	United States The American Association for the Advancement of Science 01-04-1983 American Association for the Advancement of Science
Subjects:	Biological adaptation Female animals Gene flow Insect genetics Insects Male animals Mating behavior Natural selection Phytophagous insects Population genetics Scale insects Sex ratio
Online Access:	Get full text
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Summary:	The black pineleaf scale insect has haploid males and diploid females. Ratios of males to females late in development ranged from 0.005 to 0.320 among insect subpopulations that were infesting different host trees. Demes well adapted to an individual ponderosa pine had a higher proportion of males than did demes that were poorly adapted to the host. Ratios of males to females rose in successive annual samples as natural selection increased insect adaptation. Gene flow between demes on different host trees produced predictable changes in the sex ratio.
Bibliography:	H H10 ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Article-1 ObjectType-Feature-2
ISSN:	0036-8075 1095-9203
DOI:	10.1126/science.220.4592.93