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Titolo:
SEX-RATIO VARIATION IN SHEET-WEB SPIDERS - OPTIONS FOR FEMALE CONTROL
Autore:
GUNNARSSON B; ANDERSSON A;
Indirizzi:
GOTHENBURG UNIV,DEPT ZOOL,MEDICINAREGATAN 18 S-41390 GOTHENBURG SWEDEN GOTHENBURG UNIV,DEPT GENET S-41390 GOTHENBURG SWEDEN
Titolo Testata:
Proceedings - Royal Society. Biological Sciences
fascicolo: 1374, volume: 263, anno: 1996,
pagine: 1177 - 1182
SICI:
0962-8452(1996)263:1374<1177:SVISS->2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
ANELOSIMUS-EXIMIUS ARANEAE; SOCIAL SPIDER; MULTIPLE PATERNITY; SOLITARY SPIDER; SPERM STORAGE; THERIDIIDAE; SELECTION; DIFFERENTIATION; LINYPHIIDAE; MORPHOLOGY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
41
Recensione:
Indirizzi per estratti:
Citazione:
B. Gunnarsson e A. Andersson, "SEX-RATIO VARIATION IN SHEET-WEB SPIDERS - OPTIONS FOR FEMALE CONTROL", Proceedings - Royal Society. Biological Sciences, 263(1374), 1996, pp. 1177-1182

Abstract

Female biased primary sex ratios are known in many social spiders with highly structured populations and strong inbreeding. However, the primary sex ratio of the solitary spider Pityohyphantes phrygianus is also skewed, producing one-third males and two-thirds females, whereas the sex ratio is even in the related Linyphia triangularis. The female mating behaviours and genitalia were compared, revealing differences in, e.g. apparatus for sperm storing and in mating position; P. phrygianus takes a near perpendicular position before copulation starts. After completion of mating in P. phrygianus, experimental manipulations ofthe female's position for 24 h significantly changed the proportion of males in the first brood. This suggests that a biasing mechanism acting in the female's spermathecae-ducts is at least partly responsible for the sex ratio bias. However, the sex ratio in first and second broods averaged an overall mean of one-third males. The results suggestedthat females in the wild have options, which are not used, to direct the primary sex ratio away from one-third males. This deviation from Fisherian sex ratio may be caused by selfish genetic elements and/or meiotic drive.

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Documento generato il 25/11/20 alle ore 10:07:49