Nyffeler, M.

Prey analysis of the spider Achaearanea riparia (Blackw.) (Araneae, Theridiidae), a generalist predator in winter wheat fields - 1988 - Printed

4 tables; 28 ref. Summaries (De, En)

In winter wheat fields of eastern Switzerland, the foraging of the comb-footed spider Achaearanea riparia (Blackw.) was studied. This spider - occurring in the winter wheat ecosystem in estimated numbers of ca. 0.6 ind./square metre - was observed to be a generalist predator of small- to medium-sized arthropods. With its irregular webs - which A. riparia spins in the lowest 15 per cent of the foliage -this spider captured a variety of arthropods, primarily of the orders Hymenoptera (36 per cent by numbers, mostly apterous ants), Coleoptera (19 per cent, mostly Staphylinidae, and Carabidae of the genus Amara), Homoptera (14 per cent, mostly aphids), Diptera (6 per cent), and Araneae and Acari (6 per cent, Micryphantidae and Oribatidae). - The prey data of A. riparia assessed in this study are compared with data on its feeding habits in nonagricultural habitats, indicating that it has a narrower "feeding niche" in nonagricultural habitats (tending there towards a monophagous predator of ants) than in winter wheat fields where it was found to be a nonspecific predator. - A comparison of A. riparia with other spiders inhabiting the winter wheat fields showed that, though all spiders studied are generalist predators, the "feeding niche" of A. riparia differed significantly from the others, characterizing A. riparia as a unique forager within the spider community of the winter wheat ecosystem


English

0044-2240


Animals
Arthropods
Biological control organisms
central europe
Cereals
Crops
Economic plants
Europe
Glumiflorae
Grain crops
Gramineae
Invertebrates
Monocotyledons
Pests of plants
Plants
Useful arthropods
Triticum
Wheat

89-071928
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Centro Internacional de Mejoramiento de Maíz y Trigo (CIMMYT) © Copyright 2015. Carretera México-Veracruz. Km. 45, El Batán, Texcoco, México, C.P. 56237.
Si tiene cualquier pregunta, contáctenos a CIMMYT-Knowledge-Center@cgiar.org