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lake was larger, aerial photography was used to estimate the extent of the floating algal mats. This was then scanned into a computer, digitized and estimates made. During April and November 1991 and in September 1992, Hydrilla covered between 13.3 and 16.6 km of the stage 2A lake, and this was estimated to contain populations of 5.6 billion, 275 million and 513 million immatures, respectively, mainly Culex annulirostris and Anopheles annulipes as before. However, whereas Culex annulirostris comprised 90–98 per cent of aquatic stages during 1985–86, now Anopheles annulipes s.l. comprised 43.7 per cent of all the immatures identified. Although natural mortality will reduce the numbers actually reaching adulthood, these numbers are so high that some form of control is indicated. As discussed previously, one can only speculate on the abundance of mosquito larvae that will utilize marginal emergent vegetation when it develops fully along the foreshores of the stage 2A lake. At present, from the 1991–93 data, the average number of mosquito immatures based on transects 5 m wide was 85.7/m Because the shoreline contains bare
DOI link for lake was larger, aerial photography was used to estimate the extent of the floating algal mats. This was then scanned into a computer, digitized and estimates made. During April and November 1991 and in September 1992, Hydrilla covered between 13.3 and 16.6 km of the stage 2A lake, and this was estimated to contain populations of 5.6 billion, 275 million and 513 million immatures, respectively, mainly Culex annulirostris and Anopheles annulipes as before. However, whereas Culex annulirostris comprised 90–98 per cent of aquatic stages during 1985–86, now Anopheles annulipes s.l. comprised 43.7 per cent of all the immatures identified. Although natural mortality will reduce the numbers actually reaching adulthood, these numbers are so high that some form of control is indicated. As discussed previously, one can only speculate on the abundance of mosquito larvae that will utilize marginal emergent vegetation when it develops fully along the foreshores of the stage 2A lake. At present, from the 1991–93 data, the average number of mosquito immatures based on transects 5 m wide was 85.7/m Because the shoreline contains bare
lake was larger, aerial photography was used to estimate the extent of the floating algal mats. This was then scanned into a computer, digitized and estimates made. During April and November 1991 and in September 1992, Hydrilla covered between 13.3 and 16.6 km of the stage 2A lake, and this was estimated to contain populations of 5.6 billion, 275 million and 513 million immatures, respectively, mainly Culex annulirostris and Anopheles annulipes as before. However, whereas Culex annulirostris comprised 90–98 per cent of aquatic stages during 1985–86, now Anopheles annulipes s.l. comprised 43.7 per cent of all the immatures identified. Although natural mortality will reduce the numbers actually reaching adulthood, these numbers are so high that some form of control is indicated. As discussed previously, one can only speculate on the abundance of mosquito larvae that will utilize marginal emergent vegetation when it develops fully along the foreshores of the stage 2A lake. At present, from the 1991–93 data, the average number of mosquito immatures based on transects 5 m wide was 85.7/m Because the shoreline contains bare
ABSTRACT