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Titolo:
MODES OF SOCIALIZATION AMONG HALICTINAE ( HYMENOPTERA, HALICTIDAE) .1. BIOLOGY OF HALICTINAE
Autore:
PLATEAUXQUENU C;
Indirizzi:
UNIV NANCY 1,BIOL COMPORTEMENT & PHYSIOL LAB,URA 1293 F-54506 VANDOEUVRE NANCY FRANCE
Titolo Testata:
L' Annee biologique
fascicolo: 4, volume: 32, anno: 1993,
pagine: 183 - 204
SICI:
0003-5017(1993)32:4<183:MOSAH(>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
FRE
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
NO
Recensione:
Indirizzi per estratti:
Citazione:
C. Plateauxquenu, "MODES OF SOCIALIZATION AMONG HALICTINAE ( HYMENOPTERA, HALICTIDAE) .1. BIOLOGY OF HALICTINAE", L' Annee biologique, 32(4), 1993, pp. 183-204

Abstract

Halictine bees dig their nests into the earth. These bees include a few genus and numerous species which differ by ethological characteristics, some of them having reached a social way of life. They were studied both in the field and in large laboratory cages. In this first part, a summary of the biological cycle, the main problems treated and theresults obtained are given for each of the studied species, classified from solitary to social ones. Evylaeus pallens is a solitary specieswith one annual exit of both sexes. Lasioglossum leucozonium is a solitary species with only one generation but two annual exits of females. Evylaeus villosulus is a solitary species with two generations and three annual exits of females. The following points are tackled: polymorphism of overwintering females; comparison, using eight characteristics, of the females in the two successive generations; sex ratio; longevity of overwintering females; cohabitation of several females in the same nest; biology of the summer generation. The size difference between the females of the two generations (7,4 per 100) and the low percentage of males produced in the first generation (21 per 100) might be regarded as preadaptations to a separation into castes. Halictus scabiosae is an often polygynous eusocial species with a poorly defined social polymorphism. Evylaeus calceatus, E. nigripes and E. albipes are three sibling eusocial species with two distinct broods; the first one is composed of workers (with more or less males), the second one of sexuals: future foundresses and big males. In E. calceatus, the followingproblems were dealt with : a) addition of pollen into the first broodcells: the volume of the pollen ball influences the sex of the egg laid on it: a weight threshold of sex determination can be brought out; b) large female individuals with foundress size but worker function are thus obtained: a dissociation between; size and caste is observed but no weight threshold of caste determination can be found; c) influence of temperature on the size of workers: the higher the temperature, the smaller the workers; d) polygny; e) replacement of the queen, before of after the emergence of the workers. E. nigripes produces less males in the first brood and a dissociation takes place between the provisioning of the cells and the egg-laying by the queen. According to populations, E. albipes shows a solitary form or a social form; the social level, in the latter, looks lower than in E. calceatus. Three grouped worker pupae evolved in a trigynous society, composed of an egg-layer and two pollen collectors and produced a lot of female offspring (73per 100). Evylaeus marginatus is, so far, the only perenial known social species. Each foundress produces, year after year, in the same season, more and more workers; then, on the sixth year, she gives birth to sexuals: males and future foundresses in large numbers (> 500). The main problems dealt with in that species are social polymorphism, epigenetical determinism of the castes, analysis of the factors of socialization. The study of the biological features of these various species leaves us under the impression of a great diversity.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 14/11/18 alle ore 03:31:52