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Titolo:
POPULATION-STRUCTURE AND INTERDEMIC SELECTION IN THE COOPERATIVE SPIDER ANELOSIMUS-EXIMIUS
Autore:
SMITH DR; HAGEN RH;
Indirizzi:
UNIV KANSAS,DEPT ENTOMOL,HAWORTH HALL LAWRENCE KS 66045
Titolo Testata:
Journal of evolutionary biology
fascicolo: 5, volume: 9, anno: 1996,
pagine: 589 - 608
SICI:
1010-061X(1996)9:5<589:PAISIT>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOCIAL SPIDER; KIN SELECTION; SEX-RATIO; STEGODYPHUS-MIMOSARUM; PREY CAPTURE; THERIDIIDAE; ARANEAE; EVOLUTION; RELATEDNESS; FOUNDATION;
Keywords:
ALLOZYME ELECTROPHORESIS; ARANEAE; F-STATISTICS; GROUP SELECTION; INTERDEMIC SELECTION; HETEROZYGOSITY; INBREEDING; THERIDIIDAE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
66
Recensione:
Indirizzi per estratti:
Citazione:
D.R. Smith e R.H. Hagen, "POPULATION-STRUCTURE AND INTERDEMIC SELECTION IN THE COOPERATIVE SPIDER ANELOSIMUS-EXIMIUS", Journal of evolutionary biology, 9(5), 1996, pp. 589-608

Abstract

The degree of relatedness among interacting individuals helps determine the fitness consequences of particular behaviors, whereas the partitioning (and amount) of genetic variation among and within groups controls the level at which selection will act most effectively. Three criteria are considered necessary for selection to act at the group or interdemic level: high rate of group initiation/extinction; differentialsurvival and reproduction among groups; and highly subdivided population structure. The first two criteria have been demonstrated by earlier studies of Anelosimus eximius colonies. This study employs hierarchical analysis of allozyme polymorphisms to demonstrate the third criterion, subdivided population structure. Anelosimus eximius were collected from Suriname, Panama, Ecuador, Peru and Trinidad. Seven of 40 scorable enzyme loci revealed variation; 4 of these were polymorphic withincolonies or regions. Expected heterozygosities were low, ranging from0 (Ecuador, Peru) to similar to 0.03 (Suriname). For each polymorphiclocus, hierarchical F-statistics were used to partition overall genetic variation into among-region (or among-population; F-rt), among-colony (F-sr), and within-colony (F-is) components. Samples from Suriname (43 colonies, 4 local populations) were the most informative; lack of scorable variation limited the inferences that could be drawn from other regions. A. eximius colonies are highly inbred: negative estimates of F-is imply very small effective colony sizes (similar to 6.5 for Suriname samples). By contrast, estimates of F-sr were very high: the mean for Suriname samples was 0.890, indicating neglibible gene flow among established colonies. Inbreeding within colonies, and genetic differentiation among colonies are consistent with demographic and behavioral observations of A. eximius. We suggest that interdemic selection isprobable in this species and other cooperative spiders with this typeof social system, and that mutual tolerance and absence of nest-mate recognition, as well as female-biased sex ratios, may have arisen by interdemic selection.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 11:54:16