The Victorian naturalist . major grid, and hand-ruledinto minor grids. The world aeronauti-cal charts (ICAO 1; 1,000,000, ob-tainable from the Department of CivilAviation) were used as accurate lowresolution reference maps. Broad-bents road map of Victoria andSouthern New South Wales () may be used to interpret the dis-tribution maps as the locality refer-ence code is based on the same nano-grids (see Figure 1). Species Density Analysis The species density is defined as thenumber of species which occur withinthe grid. The sextagrid (formed fromsix minor grids) was chosen for thespecies-d
The Victorian naturalist . major grid, and hand-ruledinto minor grids. The world aeronauti-cal charts (ICAO 1; 1,000,000, ob-tainable from the Department of CivilAviation) were used as accurate lowresolution reference maps. Broad-bents road map of Victoria andSouthern New South Wales () may be used to interpret the dis-tribution maps as the locality refer-ence code is based on the same nano-grids (see Figure 1). Species Density Analysis The species density is defined as thenumber of species which occur withinthe grid. The sextagrid (formed fromsix minor grids) was chosen for thespecies-density analysis, because thisgrid size offered the highest resolutionfor which gaps in samphng seemedunlikely to prove significant. Thespecies density analysis is shown in June, 1975 105 c D E F G H J K L M N 0 P Q R S T U 2 3 \ 3 4 4 5 . .., 5 6 6 7 \ 7 8 9 ^ t ^ 1 10 11 11 c D E F G H J K L M N 0 P Q R S T U Figure 1. Nanogrid indexing system based on Broadbents road map of Victoria andsouthern New South Wales (No. 400).. DOOOOOOOC-DOOOOOOOO- ooo poooooooopoooooiMHii^BiiniTiTmnoooiaMimdooo mi^ mmsA mmm gsgmitoQc mjj^mmi h Doo miTiTTfiTTiiTio ooiniartninBnTiiTitTiinTniii^ o rnnTnin 1 nuiimo6d|*« DoooooBUBE iiDUQUiimiiuiunii Dooooonunn Dunmooo DOOOOOl ninmooooocpooiinninTinnTiir^ooooommfloo ooooomnm Qumnooomiiiii nuaimnimnimim i 02r oopoooooooop>nnmftooioo> Figure 2. Sextagrid species-densityanalysis. Key to species density --4 6 ^ ooo [-3 7-9 mmmmmm 10-12 • •• • •• 13-15. 106 Vict. Nat. Vol. 92 Discussion Littlejohn (1967) has discussed thezoogeography of the Anura of south-eastern AustraHa, particularly withrespect to the patterns and origins ofspecies distributions. Further discus-sion of this type must wait extensionand completion of the grid maps forsouth-eastern Australia. The species-density analysis (Figure2) reflects the probable interactionbetween rainfall, temperature andtopography in influencing anuranspecies density. Rainfall and temperatu
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Keywords: ., bookcentury1800, bookdec, booksubjectnaturalhistory, bookyear1884
