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Titolo:
Nomadic behaviour and colony fission in a cooperative spider: life historyevolution at the level of the colony?
Autore:
Aviles, L;
Indirizzi:
Univ Arizona, Dept Ecol & Evolut Biol, Tucson, AZ 85721 USA Univ Arizona Tucson AZ USA 85721 Ecol & Evolut Biol, Tucson, AZ 85721 USA
Titolo Testata:
BIOLOGICAL JOURNAL OF THE LINNEAN SOCIETY
fascicolo: 2, volume: 70, anno: 2000,
pagine: 325 - 339
SICI:
0024-4066(200006)70:2<325:NBACFI>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOCIAL SPIDER; ANELOSIMUS-EXIMIUS; INTERDEMIC SELECTION; POPULATION-STRUCTURE; NEST RELOCATIONS; SEX-RATIO; PERSPECTIVE;
Keywords:
group migration; colony self organization; colony-level life history; sex ratio; group selection;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: Aviles, L Univ Arizona, Dept Ecol & Evolut Biol, Tucson, AZ 85721 USA UnivArizona Tucson AZ USA 85721 lut Biol, Tucson, AZ 85721 USA
Citazione:
L. Aviles, "Nomadic behaviour and colony fission in a cooperative spider: life historyevolution at the level of the colony?", BIOL J LINN, 70(2), 2000, pp. 325-339

Abstract

The concept of colony-level life history evolution is introduced for the cooperative spiders by describing the life cycle and demography of Aebutina binotata (Araneae: Dictynidae), a species living in groups containing up toseveral dozen adult females plus their offspring. In a life cycle remarkably similar to that of army ants, the colonies of A. binotata were found to reproduce by fission and to alternate nomadic and sedentary phases in tightassociation with their internal demography. Colonies of other cooperative spiders, on the other hand, remain stationary as they grow for a number of generations before producing propagules that are relatively small subsets of the maternal colony. It is suggested that A. binotata's peculiar life cycle may have unfolded as a consequence of the two-dimensional architecture of its nests. Expanding two-dimensional nests may fragment more easily than the three-dimensional nests characteristic Df other species. A long distance group migration or nomadic phase, described here for the first time for aspider, may have followed as a mechanism to cope with potential disadvantages of fission while selecting For strict synchronization of individual life cycle stages within the nests. It is shown, however, that, as in other cooperative spiders, A. binotata's sex ratio is also highly female biased. The theoretical implications of biased sex ratios in a species with fissioning colonies are briefly discussed. (C) 2000 The Linnean Society of London.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/12/20 alle ore 17:41:38