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Mosquito habitats and predation efficiency on mosquito populations in Ginninderra Wetland, Canberra, AustraliaHoa, Vu Minh, n/a January 1993 (has links)
The ecology of mosquito populations in relation to weather conditions,
emergent plants and predation in an urban wetland of Canberra was
studied. Anopheles annulipes, Aedes notoscriptus, Aedes australicus,
Aedes alboannulata, Culex annulirostris and Culex quinquefasciatus
were found. Temperature was a major climatic factor in determining
the abundance of mosquito populations in the wetland. First
collections and subsequent development of mosquitoes in Ginninderra wetland are likely to depend on local weather conditions each year.
The wetland proper was not a suitable habitat for mosquito breeding.
Tall emergent vegetation may have obstructed oviposition and
predation was also important in limiting colonization by mosquitoes.
Instead, isolated temporary waterbodies which were free of predators,
such as ground depressions, tyre tracks, domestic waste containers,
were the most important habitats for mosquitoes adjacent to the
Ginninderra wetland.
Field experiments found that predation of mosquito larvae by
mosquitofish Gambusia qffinis and notonectids Anisops was more
efficient in sunlight than shade and this was affected by the height of
emergent plants.
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Ecology of invertebrates and predator - prey interactions on mosquito larvae in urban wetlands, ACT AustraliaLambert, David J., n/a January 1989 (has links)
Giralang Pond was a water body, with little emergent or submerged
vegetation, designed to trap fine sediment and buffer input of rising water
to Ginninderra Wetland downstream. Ginninderra Wetland was designed
to retain and use sediment nutrients and other potential hazardous materials
in urban run-off. Water in the Wetland was more turbid and had lower
magnesium concentration, redox potentials and dissolved oxygen
concentration than did Giralang Pond. Water temperature was a minimum
of 4 °C in the winter and reached a summer maximum of 30 °C
Giralang Pond had more organisms but fewer taxa than Ginninderra
Wetland. The greatest abundance in the pond resulted principally from
high numbers of two numerically dominant species Calamoecia sp. and
Micronecta sp.. More organisms were found in vegetated habitats of
Ginninderra Wetland than open water habitats. The number of
invertebrates and the number of taxa found in Typha domingensis did not
differ significantly from similar estimates for Schoenplectus validus,
Gambusia qffinis was the dominant predator in both water bodies. On
one occasion, G. qffinis reached population densities of 35 individuals per
m-2 . G. qffinis was five times more abundant in Gininnderra Wetland than
in Giralang Pond and also showed a preference for vegetated areas.
G. qffinis over-grazed it's prey on several occasions.
G. qffinis, invertebrate predators and prey followed a pattern of a
community in a stable predator-prey cycle. Prey in early spring increased
population numbers and then decreased when G. qffinis and other predators
increased their numbers. The pattern was further strengthened by occurring
in both areas of open water and vegetated habitat types.
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