Preliminary report on a survey of Utricularia (Lentibulariaceae) in the Howard River – Shoal Bay area
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dried further). As these sites dried out the proportion of mound dwelling species appeared to increase. Habitat preferences of Individual species. Although many of these sand sheet Utricularias appear to be at their peak when water is seeping out of the ground, U.limosa appeared to be more tolerant of stagnant water. The small white form of U.caerulea, inhabited perhaps the most ephemerally moist sites, and was found even in less well drained areas in Eucalyptus tetrodonta forest. Utricularia kimberleyensis occurred in E.alba woodland that was waterlogged only in the wet season whilst U.uliginosa and U.caerulea (large form) frequently occupied seepage areas that remained waterlogged for most of the year. Utricularia odorata and U.chrysantha tended to be at their peak once water levels had receeded, with the former often found on more grassy sites. U.leptoplectra appeared to be most abundant on finer textured substrates further down the slope where grasses were more prevalent, surface water was deeper and ground water seepage was not evident (the classic debil debil country). Details of the distribution and abundance of most sand sheet taxa in areas of the NT away from the study area remains sketchy. Although there have been flora surveys in much of the Top End these have generally been extensive in nature covering a broad range of habitats, large geographic areas and have often been carried out at times of year unsuitable for detection of Utricularia. Targetted collection of data during other field work during the year resulted in sizeable extensions of the known range of several sand sheet Utricularia species. Further habitat specific surveys during the March to May period are required to better understand the distribution and abundance of Utricularia spp in the NT. References Fogarty, P., Lynch, B. & Wood, B. 1984. Land Resources of the Elizabeth, Darwin & Blackmore Rivers. Land Conservation Unit, Territory Parks and Wildlife Commission. Fogarty. P., Howe, D. & Dunlop, C.R. 1979. The Land Resources of the Darwin Area. Land Conservation Unit, Territory Parks and Wildlife Commission. Leach, G.J., Dunlop, C.R., Barritt, M.J., Latz, P.K. and Sammy, N. 1992. Northern Territory Plant Species of Conservation Significance. Northern Territory Botanical Bulletin No. 13, Conservation Commission of the Northern Territory, Darwin. Lucas S.J. & Czachorowski, A. 1980. Land Units of the Lambells Lagoon Middle Point Area. Land Conservation Unit, Territory Parks and Wildlife Commission. Lynch, B. 1985. Land Resources of the Humpty Doo Area. Land Conservation Unit, Territory Parks and Wildlife Commission. Pietsch, B.A. 1985. Koolpinyah 5173 1:100,000 Geological Map Series Explanatory Notes. Government Printer of the NT, Darwin. Taylor, J.M. and Tulloch, D. 1985. Rainfall in the wet dry tropics; extreme events at Darwin and similarities between years during the period 1870-1983. Australian Journal of Ecology 10: 281-295. Van Cuylenberg, H.R.M. & Czachorowski, A. 1984. Land Units of an area on Koolpinyah Station. Land Conservation Unit, Territory Parks and Wildlife Commission. Wells, M. & Harrison, C.1978. Land Units of the Howard Springs Humpty Doo Area. Land Conservation Unit, Territory Parks and Wildlife Commission.