Differences in morphology and reproduction of the barnacles Elminius covertus and Hexaminius spp. from mangrove forests in the Sydney region of New South Wales

1996 ◽  
Vol 47 (5) ◽  
pp. 715 ◽  
Author(s):  
PM Ross
Keyword(s):  
Larval Development ◽  
Reproductive Output ◽  
New South ◽  
New South Wales ◽  
Avicennia Marina ◽  
Mangrove Forests ◽  
South Wales ◽  
Juvenile Stages ◽  
Grey Mangrove

E. covertus is found on bark and leaves of the grey mangrove Avicennia marina, H. foliorum is found on leaves and H. popeiana is found on bark. 7655 barnacles were collected from two sites at Woolooware Bay from winter 1987 to summer 1989. Reproductive and external features in E. covertus differed depending on the substratum on which it lived; reproductive output was greater on leaves than on bark. The genus Hexaminius has been classified elsewhere as two species on the basis of external features and reproductive differences of adults, larval development and larval setation; however, the adults were living on different substrata. A detailed study of larval and juvenile stages of Hexaminius in the field showed no differences in external features until juveniles were one month old and no differences in the time taken to rear cyprid larvae. This suggests that Hexaminius should not continue to be divided into two species.

The status of Gould's petrel, Pterodroma leucoptera leucoptera, on Cabbage Tree Island, New South Wales

1995 ◽  
Vol 22 (5) ◽  
pp. 601 ◽  
Author(s):  
D Priddel ◽  
N Carlile ◽  
C Davey ◽  
P Fullagar
Keyword(s):  
Reproductive Output ◽  
New South ◽  
New South Wales ◽  
Breeding Population ◽  
Tree Island ◽  
South Wales ◽  
The Status ◽  
Marginal Improvement ◽  
Main Population ◽  
Cabbage Tree

Gould's petrel, Pterodroma leucoptera leucoptera, breeds only on Cabbage Tree Island, New South Wales. Annual surveys to estimate the size of the breeding population and the reproductive output were conducted between 1989 and 1992. Annual estimates of the total number of pairs breeding in the two gullies containing the main population were between 122 +/- 20 (s.e.) and 202 +/- 26. Breeding success was less than 20% between 1989 and 1991, but rose to 24.7% in 1992. This marginal improvement may be the result of management action undertaken to reduce mortality of breeding adults and fledglings. The total population is estimated to have declined from 2004 (95% confidence limits: 1464,3185) in 1970 to 1479 (1250,1815) in 1992, a decline of 26% in 22 years. The reasons for this decline are unclear.

Above- and below-ground biomasses of two species of mangrove on the Hawkesbury River estuary, New South Wales

1997 ◽  
Vol 48 (2) ◽  
pp. 147 ◽  
Author(s):  
Neil Saintilan
Keyword(s):  
New South ◽  
New South Wales ◽  
River Estuary ◽  
Avicennia Marina ◽  
Above Ground Biomass ◽  
Aegiceras Corniculatum ◽  
South Wales ◽  
Below Ground ◽  
Mangrove Communities ◽  
Intertidal Environments

Above- and below-ground biomasses of two species of mangrove, Avicennia marina and Aegiceras corniculatum, were estimated in a range of intertidal environments along the Hawkesbury River. Estimates of biomass of Avicennia communities in freshly accreted brackish substrata were in the order of 40 kg m–2, the highest figure ever recorded for temperate mangrove communities. The above-ground biomass communities of each species declined with increasing substratum salinity, whereas root/shoot ratios increased with increasing substratum salinity.

Cryptic genetic variability in Swainsona sericea (A. Lee) H. Eichler (Fabaceae): lessons for restoration

2012 ◽  
Vol 60 (5) ◽  
pp. 429 ◽  
Author(s):  
Linda M. Broadhurst ◽  
Brian G. Murray ◽  
Robert Forrester ◽  
Andrew G. Young
Keyword(s):  
Population Size ◽  
Reproductive Output ◽  
New South ◽  
New South Wales ◽  
South Australia ◽  
South Wales ◽  
Natural Grasslands ◽  
Eastern Australia ◽  
Grassland Communities ◽  
Shoot Weight

Grassland communities worldwide have been extensively modified or lost following broadscale agricultural expansion. In south-eastern Australia few natural grasslands remain, with most now being small, isolated and degraded. Conservation and restoration of grassland communities requires an understanding of the impacts of fragmentation on genetic and demographic processes. Swainsona sericea is a perennial grassland herb with conservation listing in New South Wales, Victoria and South Australia. Reproductive output, progeny fitness and genetic diversity were assessed in nine S. sericea populations occupying fragmented grasslands across the southern tablelands of New South Wales. Unexpectedly, four chromosome classes were observed among the populations (2n = 4x = 32, 2n = 10x = 80, 2n = 14x = 112, 2n = 16x = 128), suggesting a more complex taxonomy than is currently recognised. There was no association between reproductive output and population size or ploidy level whereas population size influenced the number of alleles and percentage of polymorphic loci while ploidy influenced effective alleles and expected heterozygosity. Restricted maximum likelihood analyses of progeny growth indicated that ploidy had a significant influence on height, shoot weight, shoot to root ratio and days to germination. The cytological complexity in S. sericea requires clarification, including delineating the cytological boundaries to enable land managers to include this in their conservation and management plans.

Observations on the distribution of Bankia australis calman (Mollusca : Teredinidae) in the Patonga Creek mangrove swamp, New South Wales

1983 ◽  
Vol 34 (2) ◽  
pp. 355 ◽  
Author(s):  
MA Rimmer ◽  
SL Battaglene ◽  
PL Dostine
Keyword(s):  
Temperature Effects ◽  
Frontal Zone ◽  
New South ◽  
New South Wales ◽  
Avicennia Marina ◽  
Dead Tree ◽  
Mangrove Swamp ◽  
South Wales ◽  
Bankia Australis ◽  
Insulating Properties

The distribution of B. australis was found to be limited to the frontal zone of Avicennia marina despite the presence of apparently suitable wood throughout the mangrove swamp. Numbers of B. australis in dead tree stumps were found to decrease with increasing height and decreasing diameter of the stump. It is suggested that the insulating properties of the wood substratum may affect the distribution of B. australis by minimizing temperature effects during emersion.

Life history of Mytilocypris henricae (Chapman) (Crustacea: Ostracoda) in Lake Bathurst, New South Wales

1985 ◽  
Vol 36 (6) ◽  
pp. 807 ◽  
Author(s):  
K Martens ◽  
P Deckker ◽  
TG Marples
Keyword(s):  
Life History ◽  
Larval Development ◽  
Relative Abundance ◽  
New South ◽  
New South Wales ◽  
Life Stages ◽  
Larval Stages ◽  
South Wales ◽  
Short Period ◽  
History Of

The life history of the halobiont ostracod M. henricae was studied over a 2.5-year period in Lake Bathurst, a slightly saline lake in New South Wales. Samples were collected monthly or bimonthly between March 1981 and May 1982 and weekly between August 1982 and June 1983. Relative abundance of all nine life stages (eight larval stages and one adult stage) in the samples was determined. Furthermore, in 10 selected monthly samples, sex-ratio, relative abundance of three female maturity stages and number of eggs in uteri of ovigerous females were monitored. Nearly all life stages were present throughout the year and M. henricae is thus a perennial form in Lake Bathurst. Relative abundance of life stages suggests that M. henricae produces three successive generations per year. The spring generation, hatched from eggs laid during winter, matures around November-December. Its larval development takes between 4 and 5 months. The summer generation matures after a larval development of 2.5 months; this short period is ascribed to more favourable temperatures. The autumn generation takes about 4 months to mature.

Myzostoma seymourcollegiorum n.sp. (Myzostomida) from southern Australia, with a description of its larval development

Zootaxa ◽  
2005 ◽  
Vol 1010 (1) ◽  
pp. 53 ◽  
Author(s):  
GREG W. ROUSE ◽  
MARK J. GRYGIER
Keyword(s):  
New Species ◽  
Larval Development ◽  
New South ◽  
New South Wales ◽  
South Australia ◽  
Circular Shape ◽  
Early Stages ◽  
South Wales ◽  
Eastern Australia

Few Myzostomida have been recorded from southern Australian waters. Most myzostome taxa to date have been described from the warmer waters of the Indo-Pacific, where their crinoid echinoderm hosts are most diverse. In this paper a new myzostome, Myzostoma seymourcollegiorum n. sp., is described from the crinoid Cenolia trichoptera (Comasteridae) taken from Encounter Bay near Adelaide, South Australia; further records suggest its range extends also to Tasmania and around eastern Australia to central New South Wales. Myzostoma seymourcollegiorum n. sp. is an ectocommensal on C. trichoptera and C. glebosus and there has previously been no myzostome recorded from any species of Cenolia. The new species resembles a number of other Myzostoma species that are quite flat and have a nearly circular shape with 20 short marginal cirri. The early stages of its larval development are also outlined and compared with those of other Myzostomida.

Laval development of the Megabalanine Balanomorph Austromegabalanus nigrescens (Lamarck) (Cirripedia, Balanidae)

1987 ◽  
Vol 38 (4) ◽  
pp. 511 ◽  
Author(s):  
EA Egan ◽  
DT Anderson
Keyword(s):  
Larval Development ◽  
Long Range ◽  
New South ◽  
New South Wales ◽  
Mantle Cavity ◽  
Early Spring ◽  
Dorsal Shield ◽  
Late Autumn ◽  
Larval Stages ◽  
South Wales

The presence of embryos in the mantle cavity of A. nigrescens was monitored over a 2-year period. A, nigrescens maintains some breeding individuals throughout the year but shows peak breeding during the late autumn, winter and early spring in the vicinity of Sydney, New South Wales, Australia. The larval stages of A. nigrescens are described from larvae reared in the laboratory. A. nigrescens larvae can be easily distinguished from other nauplii described from balanomorphs of New South Wales by their distinctive marginal spines and paired dorsal shield spines. The duration of larval development in A. nigrescens, 13-23 days, is similar to that of other Australian balanids and does not appear to accord with the concept that the distribution of Austromegabalanus species has involved long-range epiplanktonic dispersal. The separation of Austromegabaianus, Notomegabalanus and Megabalanus is supported by larva! differences.

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