Population ecology of Pardosa ramulosa (Araneae, Lycosidae) in flooded rice fields of northern California

The phenology, abundance, and habitat preferences of Pardosa ramulosa (McCook) in California rice fields were studied. Analysis of pitfall and floating sticky-trap samples showed that this spider apparently had one generation per year and overwintered in the immature stage. The population on the lev...

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Bibliographic Details
Published in:The Journal of arachnology 1989-01, Vol.17 (2), p.163-170
Main Authors: Oraze, M.J. (University of California, Davis, CA), Grigarick, A.A, Smith, K.A
Format: Article
Language:English
Subjects:
Agroecosystems
ARAIGNEE
ARANAS
Araneae
ARROZ ACUATICO
BIOLOGICAL CONTROL
CALIFORNIA
CALIFORNIE
CONTROL BIOLOGICO
DINAMICA DE LA POBLACION
DYNAMIQUE DES POPULATIONS
FENOLOGIA
FLOODED RICE
HABITAT
Habitat preferences
HABITATS
Levees
LUTTE BIOLOGIQUE
Lycosidae
PHENOLOGIE
PHENOLOGY
POPULATION DYNAMICS
Population ecology
Predators
Rice
RIZ AQUATIQUE
SPIDERS
Vegetation
Wetland ecology
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Summary:The phenology, abundance, and habitat preferences of Pardosa ramulosa (McCook) in California rice fields were studied. Analysis of pitfall and floating sticky-trap samples showed that this spider apparently had one generation per year and overwintered in the immature stage. The population on the levees peaked in June and preceded the buildup in the paddies. Colonization of the paddies was possible after emergent vegetation was present. Before this P. ramulosa was observed being blown over the water surface. This may have contributed to its ability to disperse within the rice agroecosystem. In the paddies, P. ramulosa was associated with patches of aquatic broadleaf weeds where potential prey, including occasional pest species, was most abundant. P. ramulosa possesses many attributes thought to be desirable for a natural enemy in an annual agroecosystem, and may be an important predator of some pest species in rice.
ISSN:0161-8202
1937-2396