Uma experiência sobre a nutrição de Onychiurus cunhai Arlé, 1970 (Insecta, Collembola), com notas sobre sua ecologia

RESUMO

Adicionando-se pequenas quantidades de açúcar a culturas de Onychiurus cunhai Arlé, 1970 consegue-se diminuir a mortalidade e estimular a reprodução destes colêmbolos. Culturas sem açúcar não apresentam reprodução. O açúcar provavelmente favorece o desenvolvimento da microflora (bactérias? leveduras?) que constituiria a verdadeira base alimentar da espécie. O material utilizado foi encontrado em Manaus; este fato vem ampliar a distribuição geográfica desta espécie que até então só era conhecida de Belém. Dados sobre a densidade populacional e uma interpretação tentativa para certas ocorrências de multidões uni-específicas de colêmbolos completam o trabalho.

Summary

A new distribution is recorded in Manaus of Cnychiurus cunhai Arlé, 1970, which was previously known only from Belém. The conditions in which it is found, as in Belém, are in areas of drainage from primitive kitchens, where dirty water, rich in organic residue is thrown out, or runs out onto the ground. These conditions were simulated in the laboratory. Five cultures of the insect were raised on a humus sand substrate, with the addition, from time to time, of small amounts of sugar. These five cultures showed favourable results in survival, as compared with five control cultures to which no sugar was added. (Pig. 1, A & B). The cultures with sugar were the only cultures to have numerous progeny (Fig. 1, C). Evidently the addition of sugar stimulated the development of the micro-flora, the probable food basis of these Collembolans which feed on fine detritus. Further, it is suggested that the mass production of certain species, as described by Arlé (1970), occurs in disturbed places with a simplified biota, a high humidity and with easily decomposed organic matter. This enhances the growth of a rich microbial life in the soil, which can in turn, support large numbers of Collembolans. It is further suggested that during the heavy rains the insects are forced out of the soil because of water-logging which is severely prejudicial to them.

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Datas de Publicação

  • Publicação nesta coleção
    Dez 1974
Instituto Nacional de Pesquisas da Amazônia Av. André Araujo, 2936 Aleixo, 69060-001 Manaus AM Brasil, Tel.: +55 92 3643-3030, Fax: +55 92 643-3223 - Manaus - AM - Brazil
E-mail: acta@inpa.gov.br