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Mosquito predators

Results from the first phase of a study to dengue fever transmitting mosquitoes and their natural enemies

Robbie Weterings

on 4 March 2013

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Transcript of Mosquito predators

by Robbie Weterings Habitat variations and the predator prey interaction of dengue transmitting mosquitoes and their natural enemies Introduction Dengue fever is a disease transmitted by mosquitoes.
Dengue fever prevalence is related to deforestation.
Dengue fever is increasing world wide.

How is the predator prey interaction affected by habitat types: deforestation, agriculture, urbanization... Methodology Two phases:
Predation rates of different species.
Field observations of the predator-prey interaction Predation rates How much mosquitoes do different predators consume per time unit?
Dragonfly and damselfly larvae (Odonata)
Backswimmers (Notonecta)
Tadpoles (Aruna)
Spiders (Araneae)
Bats (Chiroptera) Field observations Sampling the following variables:
Predator populations
Habitat types
Mosquito (larvae) populations

Modeling of the data including secondary data regarding climate, disease cases and vector control Dragonflies and Damselflies Experiment to predations rates of Odonata larvae.
Predator density
Prey density
Predator size
Prey type Experimental set-up Model output Generalized linear modeling (dragonflies were log transformed)
Model probability shows how likely it is for one model to be the best model Visualization of the Damselfly models Visualization of dragonfly models Dragonfly predicted values (back transformed) Experiments were conducted similarly to the dragonflies.
Analysis showed that predator density, prey density and prey type were the most important factors.
Prey size was of minor importance Backswimmer experiments Conclusions Average predation rates were:
6.3 (+- 5.3) for dragonflies
5.1 (+- 3.8) for damselflies
Much lower values than previous studies:
Different species and different sizes of Odonata larvae. Backswimmer Experiments Predation rates appeared to be a little bit higher than of dragonflies.

I'm sorry but I am still working on the analysis, graphs and tables so no nice pictures here ...

... well okay just not to disappoint you, here is one picture of a backswimmer through the microscope Fecal Analysis of bats Collect fecal pellets from different bats from different habitats.
Identify the insect parts in the pellets.
So far pellets were collected from 5 different locations from 5 different species. Moth scales Diptera wing
possibly mosquito Taphozous melanopogon Rhinolophus yunanensis Jumping
spiders Experiment with common jumping spider species.
Feeding mosquitoes that were reared.
Release spider and mosquitoes in terrarium Jumping spiders Data showed that there was a significant difference in predation rates between male and female spiders.
(t-test; t = 3.75, df =50.0, p=0.000
Males consumed 4.8 mosquitoes per day
Females consumed 8.6 mosquitoes per day Plexippus petersi (male) Plexippus paykulli (female) Future steps Analyze all the different experiments.
Run one experiment on tadpoles.
Run one experiment on geckos.
Phase two: field observations The end

Thank you for your attention
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