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A platform for research: civil engineering, architecture and urbanism
INDIVIDUAL AND INTERACTIVE EFFECTS OF A PREDATOR AND CONTROPHIC SPECIES ON MOSQUITO POPULATIONS
Species sharing the same trophic level as mosquito larvae (hereafter, controphic species) may have complex effects on mosquitoes by sharing both predators and food resources. We conducted an outdoor artificial pool experiment to assess the individual and interactive effects of a predator (Anax imperator) and controphic species (primarilyDaphnia magna) on larval populations of two common mosquitoes,Culex pipiensandCuliseta longiareolata.Controphic species did not significantly affect survival to pupation ofC. pipiensbut did increase time to metamorphosis and reduce size at metamorphosis.Culex pipiensandD. magna, both primarily filter feeders, probably compete for food resources. Controphic species caused a small reduction (21.9%) inC. longiareolatasurvival, an unexpected result given thatC. longiareolatalarvae are thought to be primarily periphyton grazers whileD. magnais a filter feeder. Controphic species did not affectC. longiareolatatime to, or size at, pupation.Anax imperatorreducedC. longiareolatasurvival to pupation (78%) and size at pupation (11.5%) while increasing development time in males only (11.3%).Anax imperatorcaused a smaller (32.4%), but statistically significant, reduction in the number ofC. pipienssurviving to the pupal stage but did not significantly affect size at or time to pupation. The predator did not reduce controphic species densities, and controphic species did not result in increased predator growth.We predicted that controphic species, by serving as competitors, would result in fewerC. pipienssurviving to pupation in the absence of predators. In the presence of the predator, the negative competitive effect of controphic species would be attenuated by the positive effect of serving as alternative prey. Our results followed this pattern although the predator × controphic species interaction was not statistically significant (P= 0.157). Because previous studies showed thatD. magnadid not affect predation rates byA. imperatoronC. longiareolatalarvae, and because controphic species did not have a strong competitive effect, we did not predict and did not find a predator × controphic species interactive effect.
INDIVIDUAL AND INTERACTIVE EFFECTS OF A PREDATOR AND CONTROPHIC SPECIES ON MOSQUITO POPULATIONS
Species sharing the same trophic level as mosquito larvae (hereafter, controphic species) may have complex effects on mosquitoes by sharing both predators and food resources. We conducted an outdoor artificial pool experiment to assess the individual and interactive effects of a predator (Anax imperator) and controphic species (primarilyDaphnia magna) on larval populations of two common mosquitoes,Culex pipiensandCuliseta longiareolata.Controphic species did not significantly affect survival to pupation ofC. pipiensbut did increase time to metamorphosis and reduce size at metamorphosis.Culex pipiensandD. magna, both primarily filter feeders, probably compete for food resources. Controphic species caused a small reduction (21.9%) inC. longiareolatasurvival, an unexpected result given thatC. longiareolatalarvae are thought to be primarily periphyton grazers whileD. magnais a filter feeder. Controphic species did not affectC. longiareolatatime to, or size at, pupation.Anax imperatorreducedC. longiareolatasurvival to pupation (78%) and size at pupation (11.5%) while increasing development time in males only (11.3%).Anax imperatorcaused a smaller (32.4%), but statistically significant, reduction in the number ofC. pipienssurviving to the pupal stage but did not significantly affect size at or time to pupation. The predator did not reduce controphic species densities, and controphic species did not result in increased predator growth.We predicted that controphic species, by serving as competitors, would result in fewerC. pipienssurviving to pupation in the absence of predators. In the presence of the predator, the negative competitive effect of controphic species would be attenuated by the positive effect of serving as alternative prey. Our results followed this pattern although the predator × controphic species interaction was not statistically significant (P= 0.157). Because previous studies showed thatD. magnadid not affect predation rates byA. imperatoronC. longiareolatalarvae, and because controphic species did not have a strong competitive effect, we did not predict and did not find a predator × controphic species interactive effect.
INDIVIDUAL AND INTERACTIVE EFFECTS OF A PREDATOR AND CONTROPHIC SPECIES ON MOSQUITO POPULATIONS
Ecological Applications
Stav, Gil (author) / Blaustein, Leon (author) / Margalit, Yoel (author)
Ecological Applications ; 15 ; 587-598
2005-04-01
Article (Journal)
Electronic Resource
English
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