scholarly journals 9. Lack of seasonal variation in male reproductive parameters measured in a captive and wild population of common wombats in New South Wales

2003 ◽  
Vol 15 (9) ◽  
pp. 9
Author(s):  
C. MacCallum ◽  
S. D. Johnston ◽  
D. Blyde
Keyword(s):  
Seasonal Variation ◽  
Wild Population ◽  
New South ◽  
New South Wales ◽  
Reproductive Parameters ◽  
South Wales

Reproductive synchrony of three sympatric species of wobbegong shark (genus Orectolobus) in New South Wales, Australia: reproductive parameter estimates necessary for population modelling

2007 ◽  
Vol 58 (8) ◽  
pp. 765 ◽  
Author(s):  
Charlie Huveneers ◽  
Terence I. Walker ◽  
Nicholas M. Otway ◽  
Robert G. Harcourt
Keyword(s):  
New South ◽  
New South Wales ◽  
Species Conservation ◽  
Sympatric Species ◽  
Parameter Estimates ◽  
Reproductive Parameters ◽  
Population Modelling ◽  
Male Population ◽  
Total Length ◽  
South Wales

Reproductive parameters of three closely-related sympatric species of wobbegong (Orectolobus ornatus, O. maculatus and O. halei) off New South Wales (NSW) were investigated to contribute to a biological basis for the management of a commercial fishery targeting wobbegongs. Estimates of the onset of maturity based on ovary condition were 729 mm, 1117 mm, and 1591 mm total length (TL) for O. ornatus, O. maculatus and O. halei respectively. The length at which 50% of the male population is mature based on clasper calcification was 803 mm, 1282 mm and 1784 mm TL for O. ornatus, O. maculatus and O. halei, respectively, and was similar to female onset of maturity based on uterus condition and to TL-at-maternity. These species of wobbegong had synchronous, triennial reproductive cycles. Follicles took 2 years to enlarge before ovulation. During the first year, follicles remained small, and then grew rapidly during the second year before ovulation during November. Gestation lasted ~10–11 months and parturition occurred during September–October. Mean litter sizes were nine (s.e. 0.5) and 21 (s.e. 1.5) for O. ornatus and O. maculatus, respectively, and increased with female total length in O. ornatus. Pregnant O. ornatus and O. maculatus were frequently caught in northern NSW and no pregnant wobbegongs, or females with large, yolky follicles were captured south of Sydney. Differences in the reproductive conditions of wobbegongs caught in northern and central NSW suggested geographically dependent reproductive behaviour. Knowledge of the reproductive parameters provided in this paper is necessary for adequate fisheries management and species conservation assessments.

The Season of Birth of Anxiety Neuroticsr

1978 ◽  
Vol 12 (1) ◽  
pp. 69-71 ◽  
Author(s):  
Gordon Parker
Keyword(s):  
Seasonal Variation ◽  
New South ◽  
New South Wales ◽  
Season Of Birth ◽  
Anxiety Neurosis ◽  
South Wales

An association between spring birth and anxiety neurosis in New South Wales is confirmed. Two possible explanations, that the association might reflect a seasonal variation in conceiving or in giving birth among mothers of those with significant anxiety, or that spring birth selectively disposes to anxiety, were examined. Findings suggest that both effects may be operating.

No evidence for seasonality in the ectoparasitic fauna of slimy mackerel, Scomber australasicus

1993 ◽  
Vol 44 (5) ◽  
pp. 709 ◽  
Author(s):  
KML Perera
Keyword(s):  
Seasonal Variation ◽  
New South ◽  
New South Wales ◽  
Fish Length ◽  
South Wales ◽  
Trypanorhynch Cestode

Fifteen (or sixteen) species of ectoparasites-6 monogeneans, 4 (or 5) trematodes, 2 copepods, 1 isopod, 1 cestode, and unidentified cysts -were collected from 428 Scomber australasicus individuals caught at Eden, New South Wales, Australia, between November 1988 and June 1992. Neither common nor rare parasites of slimy mackerel showed seasonal variation in abundance or prevalence. Only the copepod Brachiella magna occurred more frequently on larger (older) fish than smaller (younger fish). Two monogeneans (Kuhnia scombri, Pseudokuhnia minor), 2 didymozoids, and unidentified cysts occurred more frequently on smaller than larger fish. The intensities of the remaining monogeneans (Kuhnia scombercolias, Kuhnia sprostonae and Grubea australis), 1 didymozoid, 1 copepod (Peniculus sp.), the isopod (Ceratothoa imbricata) and a trypanorhynch cestode were not significantly correlated with fish length.

Seasonal variation in reproductive performance of Merino ewes in northern New South Wales

1962 ◽  
Vol 2 (4) ◽  
pp. 69 ◽  
Author(s):  
JF Barrett ◽  
TF Reardon ◽  
LJ Lambourne
Keyword(s):  
Seasonal Variation ◽  
Birth Weight ◽  
Reproductive Performance ◽  
New South ◽  
New South Wales ◽  
Early Summer ◽  
The Other ◽  
South Wales ◽  
Group A

Two groups of Merino ewes were observed for five years to determine the variation within years and to make comparisons between years in the numbers of ewes exhibiting oestrus, in fertility, and in lamb birth weights. A group of 35 ewes (continuous), was run constantly with vasectomized rams and services were recorded. From the other (changing) group, a fresh sub-group of 15 ewes was joined with fertile rams every four to six weeks; services were recorded, together with lambing performance and lamb birth weights.Distinct breeding and anoestrous seasons similar to those shown by other workers were observed in both groups of ewes. However, the onset of oestrous activity was a month earlier in the changing ewes than in the continuous ewes.Fertility was low during spring and early summer and reached a maximum in autumn.The birth weight of the lambs appeared to be predominantly influenced by the ewes' nutrition during pregnancy.

Seasonal variation in the fertility and fecundity of Bungaree and Peppin Merinos in central-western New South Wales

1969 ◽  
Vol 9 (37) ◽  
pp. 151 ◽  
Author(s):  
JR Giles ◽  
JP Drinan
Keyword(s):  
Seasonal Variation ◽  
Agricultural Research ◽  
New South ◽  
New South Wales ◽  
Ovulation Rate ◽  
Research Station ◽  
Agricultural Research Station ◽  
South Wales

The seasonal variation in fertility and fecundity of Bungaree and Peppin Merinos was compared at the Agricultural Research Station, Trangie, New South Wales. Ewes of both strains were joined to rams of both strains for 32 days on nine occasions ; each joining being separated from adjacent periods by an interval of 10 days. For six weeks after joining the ewes were run with vasectomized rams and were then slaughtered over the following six weeks. Incidence of oestrus and ovulation rate of the two strains were similar at all times. More Bungaree than Peppin ewes returned to service, particularly during the autumn, irrespective of the strain of rams to which they were joined. There was no difference between ram strains in percentage of ewes returning to service or percentage of ewes pregnant, but a significantly higher proportion of ova were lost in pregnant ewes with multiple ovulations after joining to Bungaree rams in winter and spring.

The occurrence of the Pygmy Right Whale Caperea marginata (Cetacea: Neobalaenidae), along the Australian coast.

1992 ◽  
Vol 15 (1) ◽  
pp. 1
Author(s):  
C.R. Pavey
Keyword(s):  
Seasonal Variation ◽  
Western Australia ◽  
New South ◽  
New South Wales ◽  
South Australia ◽  
Gestation Period ◽  
Right Whale ◽  
South Wales ◽  
Northern Edge

The occurrence of Caperea marginata, based on strandings, along the mainland coast of Australia was investigated and compared with Tasmanian records. Details were obtained for 29 mainland and 38 Tasmanian reports to March 1989. Mainland strandings of C. marginata were spatially clumped, with 19 records from South Australia and within this state, eight from Kangaroo Island and five from Port Lincoln Bay. The most northerly records were from Nowra (New South Wales) and Fremantle (Western Australia). The majority of mainland strandings were juveniles recorded from September-January, although C. marginata has also stranded during April-June. Tasmanian records extended throughout the year and animals stranded were mostly adults. The proportion of adults to juveniles was significantly lower for the mainland (nine adult, II juvenile) than Tasmania (21 adult, three juvenile), indicating that juveniles occur more frequently at the northern edge of the species' distribution. Examination of seasonal variation in length of foetal, calf and juvenile records indicated a gestation period of about 10 months and a weaning period of about 5 months. There appears to be a broad mating, calving and weaning period over some 8 months.

Seasonal Variation in Depressive Disorders and Suicidal Deaths in New South Wales

1982 ◽  
Vol 140 (6) ◽  
pp. 626-632 ◽  
Author(s):  
Gordon Parker ◽  
Stephen D. Walter
Keyword(s):  
Seasonal Variation ◽  
Affective Disorders ◽  
Depressive Disorders ◽  
New South ◽  
New South Wales ◽  
Late Winter ◽  
Peak Incidence ◽  
South Wales ◽  
Admission Data ◽  
Stimulation Of

SummaryMonth of admission data to psychiatric facilities in New South Wales, 1971–76, were examined for some 23, 000 patients with a depressive disorder to determine if seasonal variations in admissions, described in the northern hemisphere, exist there. In addition, data were examined on month of occurrence of some 3, 000 deaths due to suicide and self-inflicted injury, over the same period. Seasonality was demonstrated for three ‘psychotic’ depressive disorders, but not found for neurotic depression, further supporting the binary view of depression. A peak incidence in spring was found for MDP-mania and reactive depressive psychosis, while the peak incidence for MDP-depression was was in late winter. It is suggested that the increase in certain affective disorders around spring may follow a rapid increase in luminance, and in stimulation of the pineal gland. Suicidal deaths of males did not show significant seasonality, while those of females showed two incidence peaks, the significant one occurring in spring.

Seasonal variation of Polychromophilus melanipherus (Sporozoa:Haemoproteidae) in the bent-winged bat Miniopterus schreibersii (Chiroptera) in New South Wales

Parasitology ◽  
1970 ◽  
Vol 61 (1) ◽  
pp. 161-166 ◽  
Author(s):  
Barbara B. Dew
Keyword(s):  
Seasonal Variation ◽  
Reproductive Biology ◽  
Northern Hemisphere ◽  
Infection Rate ◽  
New South ◽  
New South Wales ◽  
South Wales

Gametocytes of a polychromophilid parasite indistinguishable from those of P. melanipherus are commonly found in the blood of the bent-winged bat Miniopterus schreibersii in New South Wales. There is a seasonal variation in infection rate, this being lowest in April (0%) and highest in August (up to 82·7%), and in density of parasitaemia.This variation is the reverse to that found in the same species of bat in the northern hemisphere.The reproductive biology of M. schreibersii in New South Wales is considered in relation to the seasonal variation in infection rate.The main vectors of the parasitism are likely to be the nycteribiid flies, Penicillidia oceanica and Nycteribia parilis n.ssp.

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