Prostanthera junonis Conn (LAMIACEAE); is recovery possible?

2001 ◽  
Vol 7 (2) ◽  
pp. 118 ◽  
Author(s):  
D. A. Tierney ◽  
C. L. Gross
Keyword(s):  
Clonal Growth ◽  
Seed Set ◽  
New South ◽  
New South Wales ◽  
Reproductive Traits ◽  
Current Status ◽  
Endangered Plant ◽  
Flowering Period ◽  
Recovery Planning ◽  
South Wales

Prostanthera junonis is an endangered plant from the Somersby plateau west of Gosford, New South Wales. Most populations occur in sites modified by clearing or adjacent to developments. This paper examines the current status and recovery efforts for this species in the light of research to date. Studies undertaken indicate that the species has the reproductive ecology expected of a colonising species. Autogamy, a low pollen/ovule ratio, higher seed set in open sites compared with densely vegetated sites, clonal growth, a long flowering period and flowering by young plants were recorded for the species. It is predicted that these reproductive traits should help the population recover from clearing. Comments on recovery planning are made.

Ecology of Nassella neesiana, Chilean needle grass, in pastures on the Northern Tablelands of New South Wales. I. Seed production and dispersal

2003 ◽  
Vol 54 (6) ◽  
pp. 613 ◽  
Author(s):  
M. R. Gardener ◽  
R. D. B. Whalley ◽  
B. M. Sindel
Keyword(s):  
South America ◽  
Seed Production ◽  
Seed Set ◽  
Unit Area ◽  
New South ◽  
New South Wales ◽  
Total Potential ◽  
South Wales ◽  
Eastern Australia ◽  
Flower Stem

Nassella neesiana (Trin. & Rupr.) Barkworth (Chilean needle grass) originated in South America and is now a widespread weed in pastures in south-eastern Australia. To date, little research on the biology of N.�neesiana has been undertaken in Australia. This study investigated several aspects of the biology of N. neesiana in pastures on the Northern Tablelands of New South Wales. The main flowering period for N. neesiana in Australia was shown to extend from November to February and is similar to that in South America. Potential for production of panicle seeds was large and varied from 1584 seeds/m2 in 1995 to 22 203 seeds/m2 in 1996 as a result of changes in the density of flowering tillers per unit area. Nassella neesiana produced a further 7.2 cleistogenes (hidden seeds in the flower stem) on average per tiller. Hence, total potential seed production (panicle seeds and cleistogenes) was 28 282 and 8036 seeds/m2 in 1996 and 1997, with the cleistogenes accounting for 21.5 and 26.1% of the total respectively. Furthermore, the production of cleistogenes was not affected by clipping flowering tillers at 3 different heights. Three possible dispersal mechanisms of N. neesiana seeds were investigated. Adherence of seeds to the wool appeared to be the most effective. Twenty-five per cent of seeds that were picked up naturally in the wool of sheep after grazing in a paddock of N. neesiana, remained after 5 months. Shearing just before seed set reduced the number of seeds adhering to the wool. An average of 1.7% of panicle seeds and 5.3% of cleistogenes fed to Angus steers passed through the animal intact within 4 days, but <50% of these seeds were viable. The majority of seeds recovered from a wind dispersal experiment were within 1 m of the parent plant and the furthermost seed was 2.8 m away. The implications of these results for management are discussed.

Comparison of the performance of subterranean clover cultivars in southern New South Wales. 1. Persistence, productivity, and seed yields

1993 ◽  
Vol 33 (5) ◽  
pp. 581 ◽  
Author(s):  
BS Dear ◽  
PD Cregan ◽  
GM Murray
Keyword(s):  
Seed Set ◽  
Plant Density ◽  
New South ◽  
New South Wales ◽  
Subterranean Clover ◽  
Wagga Wagga ◽  
Hard Seed ◽  
South Wales ◽  
Seed Reserves ◽  
Seed Yields

The density, productivity, flowering characteristics, and seed reserves of 14 lines (10 cultivars and 4 experimental lines) of subterranean clover were observed over 5 years (1983-87) on a red earth soil at Wagga Wagga, New South Wales. Plant density increased from 149-318 plants/m2 in 1983 to 1975-13925 plants/m'n 1987. Herbage yields of all cultivars during autumn-winter were similar in most years except in July 1985 when Seaton Park was superior. Cultivars in the midseason or later flowering groups were more productive in late spring and better able to utilise the extended growing seasons that occur periodically in this environment. The mean time from emergence to 5% flowering of all cultivars was 168 days with March germination in 1985 but decreased to 13.5 days with May germination in 1986. The number of days to flowering at Wagga Wagga was highly correlated with maturity ranking at Perth (r2 = 0.92 in 1985 and? = 0.93 in 1986). In the first year, average seed set was 295 kg seed/ha. but by summer of the fourth year the seed pool ranged from 124 kg/ha for Clare to 1190 kg/ha for Nungarin, the earliest flowering cultivar. The quantity of hard seed that carried over to the next year varied significantly between cultivars, with Enfield, Woogenellup, and Clare having the least, and Nungarin, Northam, Dalkeith, and Daliak the most. Seed set was related to maturity ranking only in 1984, although root disease probably affected seed yields in 1985-86. The proportion of hard seed that carried over was much higher than expected, particularly in soft-seeded cultivars. The newly released cultivar Junee was well adapted to the environment; it was later maturing than the recommended cultivar Seaton Park but was able to maintain high seed reserves. Karridale, another new cultivar, maintained higher seed reserves than the older Mount Barker.

Carcinoma in situ of the breast in New South Wales, Australia: Current status and trends over the last 40 year

The Breast ◽  
2018 ◽  
Vol 37 ◽  
pp. 170-178 ◽  
Author(s):  
Gemma Jacklyn ◽  
Stephen Morrell ◽  
Kevin McGeechan ◽  
Nehmat Houssami ◽  
Les Irwig ◽  
...  
Keyword(s):  
Carcinoma In Situ ◽  
New South ◽  
New South Wales ◽  
Current Status ◽  
South Wales ◽  
Status And Trends

The Historical and Current Status of Freshwater Fish in New South Wales

1994 ◽  
Vol 29 (3-4) ◽  
pp. 166-176 ◽  
Author(s):  
R. A. Faragher ◽  
J. H. Harris
Keyword(s):  
Freshwater Fish ◽  
New South ◽  
New South Wales ◽  
Current Status ◽  
South Wales
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