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AbstractFeeding activities of the predatory nematodes Laimydorus baldus andDiscolaimus major were studied under laboratory conditions in relation totemperature (5–40°C), prey density (25–250 individuals), predator starvation(0–12 days) and prey incubation (4–24 h) using the rice root nematode,Hirschmanniella oryzae, as prey. Prey search duration, rate of predation,and the number and duration of predators feeding and aggregating at feedingsites were studied. Discolaimus major killed more prey, and fed andaggregated longer than L. baldus. Predator activities at the feeding sitewere optimal at 30°C. Predators starved for 6 days required the briefestprey search duration, and remained aggregated at the feeding site for alonger duration. Predators were increasingly efficient at search prey asprey density increased. Prey search and feeding durations were shortest whenprey nematodes were incubated between 8–16 h. Predation rate was optimalwhen prey were incubated for 16 h. Prey search and killing abilities of L.baldus and D. major were governed by temperature, prey density, starvationand prey incubation, and depended upon feeding duration, number of predatorsfeeding and aggregating at the feeding sites.
Nematology – Brill
Published: Jan 1, 2005
Keywords: PREDATOR STARVATION; TEMPERATURE; PREY INCUBATION; BEHAVIOUR; FEEDING; DENSITY
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