Abstract
Gregariousness is a widespread behavior among harvestmen, with reports for species from South and North America, Europe and India. The present note reports an enormous aggregation (300,000 individuals) of the harvestman Pseudogagrella sp. (Sclerosomatidae: Gagrellinae) in the tropical rain forest of Xishuangbanna, southern prefecture of Yunnan Province, China. The aggregation was found during winter months, from November to March, in five adjacent, but clearly defined patches ranging from 1 to 6 m2. Females comprised the greater part of the aggregation and only a few males were found in the patches. With the rise in temperature, the density of individuals reduced considerably, and most of them accumulated in a single patch and finally disappeared by the end of April
Highlights
During a field trip to a seasonal rainforest on limestone in Xishuangbanna (21.910N & 101.280E), in the southern prefecture of Yunnan Province, southwestern China, a mono-species aggregation of the harvestman Pseudogagrella sp. (Sclerosomatidae: Gagrellinae) was
The aggregation was first observed on 01 January 2005, and was monitored every two weeks during morning hours until 29 April 2005, which are winter months of the tropical-subtropical transition zone
Sample individuals (n = 5) from each patch were brought to the laboratory for species and sex determination
Summary
During a field trip to a seasonal rainforest on limestone in Xishuangbanna (21.910N & 101.280E), in the southern prefecture of Yunnan Province, southwestern China, a mono-species aggregation of the harvestman Pseudogagrella sp. (Sclerosomatidae: Gagrellinae) was. During a field trip to a seasonal rainforest on limestone in Xishuangbanna (21.910N & 101.280E), in the southern prefecture of Yunnan Province, southwestern China, a mono-species aggregation of the harvestman Pseudogagrella sp. The ground vegetation in the area of the aggregation was 30-40 cm tall and was dominated by the Malabar nut Adhatoda vasica Nees (Image 1). The aggregation was first observed on 01 January 2005, and was monitored every two weeks during morning hours until 29 April 2005, which are winter months of the tropical-subtropical transition zone.
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