Reproduction in female swamp wallabies, Wallabia bicolor

2006 ◽  
Vol 18 (7) ◽  
pp. 735 ◽  
Author(s):  
Justyna Zofia Paplinska ◽  
Richard L. C. Moyle ◽  
Peter D. M. Temple-Smith ◽  
Marilyn B. Renfree
Keyword(s):  
Reproductive Biology ◽  
Growth Curve ◽  
Significant Variation ◽  
Gestation Period ◽  
In The Wild ◽  
Wallabia Bicolor ◽  
Swamp Wallaby

The swamp wallaby (Wallabia bicolor) is a common, medium-sized, browsing macropodid marsupial that is unique in many ways. Relatively little is known about the reproductive biology of this species. Previous studies have proposed that the swamp wallaby has a pre-partum oestrus because the gestation period ( x ¯ -->x = 35.5 days, n = 4) is on average longer than the oestrus period ( x ¯ -->x = 31.0 days, n = 5) and the period from the removal of pouch young (RPY) to mating ( x ¯ -->x = 26.0days, n = 3). In the current study, the period from RPY to birth was confirmed at x ¯ -->x = 31.25 days (n = 4) in captive animals, consistent with a pre-partum oestrus. A growth curve for swamp wallaby pouch young was constructed from the progeny of captive animals to estimate the age and date of birth of young in a wild, culled population in South Gippsland, Victoria, and the reproduction of females in the wild throughout the year was examined. Young were born in every month of the year, with no statistically significant variation in the number of young born in each month. Females did not have a period of seasonal anoestrus and conceived throughout the year. Female swamp wallabies in South Gippsland bred continuously throughout the period of this study.

Road-Kills of the Swamp Wallaby, Wallabia-Bicolor, on North-Stradbroke-Island, Southeast Queensland

1989 ◽  
Vol 16 (1) ◽  
pp. 95 ◽  
Author(s):  
R Osawa
Keyword(s):  
Significant Variation ◽  
Faecal Pellet ◽  
Native Forest ◽  
The Road ◽  
Pellet Counts ◽  
Wallabia Bicolor ◽  
The Relationship ◽  
Southeast Queensland ◽  
Swamp Wallaby ◽  
Made In

A total of 127 road-kills of the swamp wallaby, Wallabia bicolor, on North Stradbroke Island in south-east Queensland was recorded between May 1981 and April 1982. The majority of kills were of adults. Road-kills occurred mainly at night, suggesting that W. bicolor is nocturnal, and were significantly correlated with the number of vehicles brought onto the island by ferries. Faecal pellet counts were made in classified habitats along the road in order to determine the relationship between the population density and road-kills of W. bicolor. Road-kills were significantly correlated with the faecal pellet counts in the Disturbed Ares (narrow, artificially cleared areas adjacent to the road) but not with the counts in the Native Area (i.e. native forest). This indicates that the wallabies were attracted to the disturbed area and became more susceptible to being killed by vehicles. There was no significant variation in the number of road-kills between lunar phases.

scholarly journals Uterine fluid composition of the dwarf ornate wobbegong shark (Orectolobus ornatus) during gestation

2011 ◽  
Vol 62 (6) ◽  
pp. 576 ◽  
Author(s):  
Megan T. Ellis ◽  
Nicholas M. Otway
Keyword(s):  
Reproductive Biology ◽  
Coastal Waters ◽  
Reproductive Strategies ◽  
Yolk Sac ◽  
Gestation Period ◽  
Fluid Composition ◽  
Complex Composition ◽  
Eastern Australia ◽  
Uterine Fluid ◽  
Low Levels

Low fecundity in chondrichthyans makes them extremely susceptible to fishing, so understanding the various reproductive strategies in this group is vital for management. Knowledge of the uterine fluid (UF) composition throughout gestation is fundamental to this understanding, yet is restricted to a few species. This study focussed on the UF composition of the wobbegong (Orectolobus ornatus), which inhabits coastal waters off eastern Australia. The UF was quantified throughout pregnancy. Fluids surrounding uterine eggs had a complex composition, with mean urea (98.48 mmol L–1), sodium (560.25 mmol L–1) and potassium (13.93 mmol L–1) concentrations significantly greater than those in seawater. A change in composition, from complex to simple, occurred after 3–4 months gestation. Major electrolyte concentrations then resembled seawater for the remainder of gestation, suggesting the flushing of the uteri with seawater and evidenced by fluctuating low levels of urea. The gestation period reflected the time for metabolism of yolk stores, osmotic and ionic adjustment, development of functioning immunological systems and prevention of external yolk sac damage. Our study is the first documentation of UF composition for a wobbegong shark and increases understanding of its reproductive biology.

Reproductive biology and stress of captivity in male brown treesnakes (Boiga irregularis) on Guam

2005 ◽  
Vol 53 (4) ◽  
pp. 249 ◽  
Author(s):  
Robert D. Aldridge ◽  
Anna A. Arackal
Keyword(s):  
Reproductive Biology ◽  
Vas Deferens ◽  
Stress Hormones ◽  
Reproductive Hormones ◽  
Control Group ◽  
Blood Levels ◽  
Boiga Irregularis ◽  
Calorie Diet ◽  
In The Wild ◽  
Group 3

This study was designed to describe the reproductive biology of a sample of wild-caught brown treesnakes and to determine the effect of increased food intake (nutrition) on the development of the testis and sexual segment of the kidney, and on sperm storage in the vas deferens in captive males. The wild snakes were trapped and preserved within 24 h, in December 1999, from a snake trap-line in northern Guam. In the nutrition experiment adult snakes were matched for snout–vent length and separated into three groups. Groups 1 and 2 were fed a high-calorie diet for 8 and 4 weeks, respectively. Group 3 males, the control group, received a low-calorie diet and were preserved at 7 weeks. In the wild sample all snakes above 1035 mm snout–vent length were undergoing spermatogenesis, had a well developed sexual segment of the kidney, and had sperm stored in the vas deferens. In all experimental groups, spermatogenesis and development of the sexual segment of the kidney was terminated or inhibited, and in most snakes sperm were absent from the vas deferens. Blood levels of stress hormones (i.e. corticosterone) and reproductive hormones (androgens) were not measured. However, a previous study reported that the stress of captivity causes an increase in plasma levels of corticosterone in brown treesnakes, and other studies on squamates indicate that high corticosterone levels can disrupt reproductive hormones and shut down the reproductive cycle.

Evaluation of an exclusion plot design for determining the impacts of native and exotic herbivores on forest understoreys.

2008 ◽  
Vol 30 (2) ◽  
pp. 83 ◽  
Author(s):  
A. Bennett ◽  
G. Coulson
Keyword(s):  
Partial Exclusion ◽  
Wallabia Bicolor ◽  
Sambar Deer ◽  
Cervus Unicolor ◽  
Swamp Wallaby ◽  
Exotic Herbivores ◽  
Plot Design ◽  
Water Catchments

To study the effects of grazing and browsing by Sambar deer (Cervus unicolor), swamp wallaby (Wallabia bicolor) and wombats (Vombatus ursinus) exclosure plots measuring 10 m x 10 m were erected in the Upper Yarra and O'Shannassy water catchments near Melbourne, Victoria. Total exclusion fences and partial exclusion fences were erected. Design details and costs are provided. Operational problems are discussed.

Reproduction in the red-legged pademelon, Thylogale stigmatica Gould (Marsupialia : Macropodidae), and age estimation and development of pouch young

1994 ◽  
Vol 21 (5) ◽  
pp. 553 ◽  
Author(s):  
PM Johnson ◽  
K Vernes
Keyword(s):  
Age Estimation ◽  
Post Partum ◽  
General Pattern ◽  
Age Determination ◽  
Gestation Period ◽  
Growth Equation ◽  
In Captivity ◽  
In The Wild ◽  
The Mean

The reproduction of Thylogale stigmatica in captivity was studied and a predictive growth equation for age determination of the pouch young was developed. The general pattern of reproduction involved an oestrous cycle of 29-32 days, a gestation period of 28-30 days and a mean pouch life of 184 days. A post-partum oestrus and mating generally followed birth. Births were observed in all months in captivity, and from October to June in the wild. Mean age of weaning of young was 66 days following permanent pouch emergence, and the mean ages at maturity for females and males was 341 and 466 days, respectively.

Unusual Manifestation of Cryptococcosis in a Swamp Wallaby (Wallabia bicolor)

2012 ◽  
Vol 146 (1) ◽  
pp. 71
Author(s):  
C. Lempp ◽  
F. Seehusen ◽  
M. Kummrow ◽  
K. Grützmacher ◽  
W. Baumgärtner
Keyword(s):  
Unusual Manifestation ◽  
Wallabia Bicolor ◽  
Swamp Wallaby

scholarly journals Camera traps provide insight into factors influencing trap success of the swamp wallaby, Wallabia bicolor

2014 ◽  
Vol 36 (1) ◽  
pp. 15 ◽  
Author(s):  
Ami Bennett ◽  
Graeme Coulson
Keyword(s):  
Camera Traps ◽  
The Moon ◽  
Target Species ◽  
Moon Phases ◽  
Trap Door ◽  
New Moon ◽  
Wallabia Bicolor ◽  
Successful Capture ◽  
Insight Into ◽  
Swamp Wallaby

Trapping programs for mammals often have low capture success, which is known to be influenced by a range of environmental factors, in addition to aspects of the traps themselves. However, the behavioural responses to traps by the target species are largely unknown. We simultaneously set camera traps and soft-walled double-layered traps for swamp wallabies, Wallabia bicolor, and used images from the camera traps to investigate responses by the target species. Wallabies mostly visited traps after sunset, with the number of visits declining steadily through the night. Visits to traps were more frequent during crescent and new moon phases and when the moon was set. In the majority (59%) of these visits, wallabies did not enter the traps. In some cases wallabies consumed only the bait outside the trap, or the trap door had been closed, usually by other swamp wallabies or bobucks, Trichosurus cunninghami, but in many cases (28% of visits) we could not discern why wallabies failed to enter. When wallabies did enter traps, just 14% of visits resulted in successful capture, with non-captures mainly occurring because wallabies reached in to obtain bait without triggering the trap.

Nesting plants of dwarf honeybee, Apis florea F. under tropical conditions of Karnataka, India

2010 ◽  
Vol 60 (4) ◽  
pp. 437-447
Author(s):  
Shekarappa Basavarajappa
Keyword(s):  
Significant Variation ◽  
Pongamia Pinnata ◽  
Apis Florea ◽  
Shrub Species ◽  
Elite Strategy ◽  
Tropical Conditions ◽  
In The Wild ◽  
Trees And Shrubs ◽  
Wind Blow

AbstractThe study was conducted to record the nesting plants of dwarf honeybee, Apis florea at different habitats under tropical conditions of Karnataka, India during 2007-2008. The data revealed that, 13 genera belonging to nine trees (8 families) and four shrubs (4 families) provided the nesting platform to A. florea. The density, abundance, and frequency of nesting plants varied considerably. While Pongamia pinnata was selected frequently among the trees, Bouganvillea sp. was preferred among the shrubs for nesting. There was a significant variation (X2 = 18.25; P<0.05) among the tree and shrub species selected for nesting by A. florea in different habitats. Further, thin to medium (2-4 inch dia.) sized limbs, often interspersed thickly at different elevations in trees and shrubby plants were found suitable for the construction of colonies. The combs were found at the peripheral and middle regions of thickly interspersed canopy in trees and shrubs respectively, possibly to ensure withstanding the comb weight, protecting the comb from wind blow, and avoiding predation and hunting. Thus, it appears that A. florea adopts elite strategy to safeguard its colonies from certain ecological and biological impediments in the wild by choosing plants with thick interspersed limbs covered with thick canopy. In view of its role as an important pollinating agent of many crops, the preservation of the commonly chosen nesting plants becomes all the more important for conservation of A. florea.

Home range of the swamp wallaby, Wallabia bicolor

1993 ◽  
Vol 20 (5) ◽  
pp. 571 ◽  
Author(s):  
S Troy ◽  
G Coulson
Keyword(s):  
Home Range ◽  
Home Range Size ◽  
Range Size ◽  
Home Ranges ◽  
Convex Polygons ◽  
Minimum Convex Polygon ◽  
Eucalypt Forest ◽  
Significant Difference ◽  
Wallabia Bicolor ◽  
Swamp Wallaby

Home range in the swamp wallaby, Wallabia bicolor (Marsupialia : Macropodoidea) was examined using radio-tracking in a 150-ha remnant of mixed eucalypt forest at Healesville, Victoria. Three methods were used to calculate home-range size: minimum convex polygons, fourier transform MAP(O.95) and MAP(0.50) estimation, and harmonic mean 50% isopleths and 95% isopleths. The minimum convex polygon method produced the largest estimate of home-range area (16.01 +/-.45 ha). Each method required a different number of fixes before home-range area estimates reached an asymptote. These data showed that W. bicolor have small, overlapping home ranges and that the shape of the home range varied between individuals. Home-range area was larger than previously reported for this species, and there was no significant difference between the sexes in home-range size.

Habitat selection by the swamp wallaby (Wallabia bicolor) in relation to diel period, food and shelter

2009 ◽  
Vol 34 (2) ◽  
pp. 143-155 ◽  
Author(s):  
JULIAN DI STEFANO ◽  
ALAN YORK ◽  
MATTHEW SWAN ◽  
ANDREW GREENFIELD ◽  
GRAEME COULSON
Keyword(s):  
Habitat Selection ◽  
Wallabia Bicolor ◽  
Diel Period ◽  
Swamp Wallaby
Sign in / Sign up

Export Citation Format

Share Document