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1 August 2004 POPULATION DYNAMICS OF AN ISOLATED POPULATION OF THE HARVESTMAN ILHAIA CUSPIDATA (OPILIONES, GONYLEPTIDAE), IN ARAUCARIA FOREST (CURITIBA, PARANÁ, BRAZIL)
Luiz Augusto Macedo Mestre, Ricardo Pinto-da-Rocha
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Abstract

The harvestman Ilhaia cuspidata was studied in Curitiba, state of Paraná, Brazil. The site studied is a 30,000 m2 forest remnant of Araucaria forest surrounded by houses. Harvestmen were sampled 21 times over 14 months (June 1997–August 1998); at intervals of 21–30 days. The population size was estimated by Fisher-Ford and Jolly methods, and did not vary considerably from autumn (June) to spring (November 1997). However, it increased rapidly (300 %) during late spring and summer (December– March). The lowest population size estimated was 1,429 adults/subadults, during the winter (June 1997) and, the highest was 14,445 during the autumn (April 1998). The recapture rates ranged from 16%–41%. The sex ratio observed in all sampling periods was 1:1. The density varied from 0.05 (winter) to 0.47 adult subadults/m2 (autumn). The extremely different abundances observed between seasons could have been influenced by temperature. The immatures were observed all year, suggesting a continuous reproduction, but they were much more abundant during spring and summer. Ecological aspects including aggregation, individual movement and life span were also discussed.

Luiz Augusto Macedo Mestre and Ricardo Pinto-da-Rocha "POPULATION DYNAMICS OF AN ISOLATED POPULATION OF THE HARVESTMAN ILHAIA CUSPIDATA (OPILIONES, GONYLEPTIDAE), IN ARAUCARIA FOREST (CURITIBA, PARANÁ, BRAZIL)," The Journal of Arachnology 32(2), 208-220, (1 August 2004). https://doi.org/10.1636/M02-61
Received: 11 November 2002; Published: 1 August 2004
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