Ecologia de populações da aranha Porrimosa lagotis (Lycosidae) nas reservas da Mata de Santa Genebra, Campinas (SP) eSerra do Japi, Jundiai (SP)

AUTOR(ES)
DATA DE PUBLICAÇÃO

1996

RESUMO

Porrimosa lagotis (Holmberg) is a South-american web-building spider of the Family Lycosidae. It is an exception in this family, that is composed mainly by wandering spiders. From May of 1990 to January of 1992, ecological aspects of two populations of P. lagotis were studied in the following forest areas: Serra do Japi (Jundiaí - SP) and Reserva de Santa Genebra (Campinas - SP). Some natural history aspects of this species were described, as well as its phenology, variations in size and height of the webs and resources utilization at these two areas. Its phenology, marqued by seasonal aspects with well defined periods of egg sacs deposition and spiderlings birth, was possibly associated with a drier and colder period alternating with nother warmer and humid. Variations in density of P. lagotis and its associations to life cycle and resources utilization were investigated in each area. The sheet-web area and the tube funnel length tended to increase with the individual body size. Females carrying egg sacs modified their webs by decreasing the sheet-web area and increasing the funnel tube. This behavior seems to constitute a trade-off mechanism envolving food acquisition, termorregulation and brood-protection. Vertical stratification of webs varied with the life cycle in each area and differed between them. The utilization of different kinds of substracts, where the refuges were constructed, varied with the individual body size and differed in frequencies between the two study areas. Food availability, vegetation structure, climatic aspects and anthropic perturbations, that ocorred at both areas, are some factors discussed as responsible for the patterns observed in each area and for the differences between the two populations in these study

ASSUNTO(S)

aranha - ecologia aranha - biologia

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