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Abstract
The fauna of spiders on the islands of the Peter the Great Gulf in the south of the Far East is poorly studied. Data on the species composition, abundance and biotopic distribution of orb-weaver spiders (Aranei: Araneidae) of Askold Island are given in the paper for the first time. The island is located in the Peter the Great Gulf in the south of Primorskii krai. The material was collected in autumn of 2014, 2015 and in August 2016. In autumn, random collection of spiders was made. In summer 2016, 21 key sites were selected on the island. The size of each site is 3×25 m. The spiders were collected using a sweeping method supplemented with a manual method. The biotopic correspondence of 12 species of spiders belonging to 7 genera was revealed. It has been established that the distribution of spiders throughout the island is uneven. The greatest diversity is noted in broad-leaved polydominant forests. Araneus ventricosus (L. Koch, 1878) whose density reaches 15 specimens per 100 m2 dominates there. Rocky beaches have the lowest species diversity. The only species is found there – A. ventricosus (density 4 specimens per 100 m2). Only Neoscona adianta (Walckenaer, 1802) (density 10 specimens per 100 m2) inhabits the swampy area with sedges. The map of the density of orb-weaver spiders has been compiled on the basis of original data of the author and satellite images. This map allows to estimate the distribution and density of population of spiders over the area of Askold island in the summer. Alenatea cf. wangi Zhu et Song, 1999 and Pronoides brunneus Schenkel, 1936 are recorded on the islands of the Peter the Great Gulf for the first time.
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