Ecological 8ucckssion Obslrvkd During Regeneration 
OK TrIODJA PUN(iKXS H.Bk. AfTKH HURXIN(i. 
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QUADRATS. 
Eig'ures 1 and 2 (20 \ 20 links ==4x4 metres), represent the pri- 
mary stage in regeneration. The Triodia seedling's are associated with 
numerous annual species. The areas mapped were on the Warraldng ex- 
perimental }>lots and the original co\'er was burnt oft' in December, 1940. 
Rain fell in March (.willy-willy) and in April -and May (light falls). The 
quadrats were ma])pGd in June. It is evident that germination took place 
at more than one stage. The seedlings varied from 2-6 cm. in height. 
The sandy loam had a scanty cover of drift sand, formerly associated 
with tussocks. This drift sand was disturbed by the March floods. It is 
probable that many seeds, imbedded in the sand, were washed away. 
Whether this had much effect on the relative abundance of the various 
annual species cannot be ascertained from one season's observations. The 
sand drifts do, however, explain the grouping of seedlings which is evident 
on the maps. 
In Figure 3 (50 x 50 links = 10 x 10 metres) the patch of ground re- 
liresented was about a hundred yards from the experimental plots. The 
quadrat was surveyed in June. At this stage of regrowth there was fierce 
competition between the Triodia tussocks and ephemeral growth Avas meagre. 
In one corner an adult tussock had survived. Across another there is a 
patch of primary regroAA’th Avhich suggests that it Avas burnt in the previous 
season. 
