Red-necked pademelon mothers may throw the joey out of their pouch during hard times to ensure that their own survival. This is a type of infanticide, but probably has a low cost to the mother because she is probably already pregnant with another offspring in embryonic diapause, just waiting for conditions to improve before proceding in its development.
Red-necked pademelons communicate with one another using different clicks and by thumping their hind feet. As mammals, they also have visual capability, and probably use some visual signals, such as body postures, to communicate. Although not specifically reported for this species, it is likely that there are some scent cues, especially related to reproduction. Tactile communication occurs between mothers and their young, as well as between mates.
Communication Channels: visual ; tactile ; acoustic
Perception Channels: visual ; tactile ; acoustic ; chemical
The distribution of red-necked pademelons has decreased in Australia due to clearance of native vegetation for agriculture, dairying, and forestry. Even with this, the species is common in some areas.
The red-necked pademelon is not currently protected under CITES or IUCN.
US Federal List: no special status
CITES: no special status
IUCN Red List of Threatened Species: least concern
There is no documented information about red-necked pademelons having a negative effect.
Red-necked pademelons have been important for ecotourism in the areas in which they occur.
Positive Impacts: ecotourism
The major ecosystem role that red-necked pademelons play is that they are food for their predators. Through their foraging habits, they are likely to impact the growth of vegetation.
Food consists of grass, leaves, roots and bark. Foraging behaviors of red-necked pademelons consist of feeding on forest edge at night. This apparently reduces their risk of falling prey to diurnal predators. A larger group size increases the range of feeding from forest cover.
Plant Foods: leaves; roots and tubers; wood, bark, or stems
Primary Diet: herbivore (Folivore )
Red-necked pademelons (Thylogale thetis) are only found in parts of eastern Australia. They range from eastern Queensland to just below mid-coast of New South Wales.
Biogeographic Regions: australian (Native )
The habitat of red-necked pademelons consists of rainforests, thick scrub or grassland areas, and eucalyptus forests.
Habitat Regions: temperate ; terrestrial
Terrestrial Biomes: savanna or grassland ; rainforest
I found no documented information on this topic.
Average lifespan
Status: captivity: 9 years.
Red-necked pademelons have a head and body length of 290 to 630 mm, with a tail length of 270 to 510 mm. They exibit sexual dimorphism in size, with the males weighing approximately 7 kg compared to the average female weight of 3.8 kg.
Red-necked pademelons are grizzled gray in color above with a light hip stripe often present. The short tail of these animals is only lightly furred. It is also thick and rounded.
Average mass: females-3.8, males-7 kg.
Range length: 290 to 630 mm.
Sexual Dimorphism: male larger
Other Physical Features: endothermic ; bilateral symmetry
Average mass: 3800 g.
Predators of red-necked pademelons are the introduced fox and the dingo, and possibly even large birds of prey. They decrease predation risk by foraging at night.
Known Predators:
Little is known about mating systems in pademelons. Males in captivity tend to be somewhat aggressive toward one another. Taken with the pronounced sexual dimorphism in this species, this is suggestive of polygyny. Polygyny is common in macropods.
It has been recorded that female red-necked pademelons when in oestrus will be found around larger males, suggesting active mate choice by females.
Mating System: polygynous
Red-necked pademelons reach sexual maturity at about 18 months of age. Reproduction occurs in the autumn and spring in the north, and during the summer in the south. These pademelons usually give birth to a single young, although twins have been recorded in the genus.
Embryonic diapause is known to occur in red-necked pademelons. Embryonic diapause is when the division of the cells in the embryo stops when there are about 100 cells. This "started" but unfinished embryo is held in the uterus until conditions are right for development to continue. This allows for an embryo to be in the uterus while a mother is weaning another joey in the pouch. Once the nursing joey is weaned, development of the embryo can continue. The embryo experiences a short "actual" gestation period of approximately 30 days, but can stay in the pouch for up to 6 1/2 months.
In all marsupials, the young are altricial, and must make their way from the birth canal into a pouch, where they receive milk from the mother and complete their development.
In another member of the genus, T. billardierii, a joey stays in the pouch for 202 days, and weaning occurs about 4 months after the young permanently leave the pouch. Sexual maturity is slightly earlier in T. billardierii than in T. thetis, and it is possible that these other developmental events occur slightly later in the latter species as well.
Breeding interval: These pademelons are apparently able to produce offspring once per year.
Breeding season: Breeding occurs during the autumn and spring in the north, and during summer in the south.
Range number of offspring: 1 to 2.
Average number of offspring: 1.
Average gestation period: 30 days.
Average age at sexual or reproductive maturity (female): 18 months.
Average age at sexual or reproductive maturity (male): 18 months.
Key Reproductive Features: iteroparous ; seasonal breeding ; gonochoric/gonochoristic/dioecious (sexes separate); sexual ; fertilization ; viviparous ; embryonic diapause
Average number of offspring: 1.
Average age at sexual or reproductive maturity (female)
Sex: female: 555 days.
Parental care in this species has not been detailed in the literature. However, like other macropods, it is likely that the bulk of parental care is performed by the mother. Mothers nurse their joeys in a pouch, providing them with protection and grooming, until the young have developed enough to leave the pouch. Leaving the pouch permanently is a slow process, and during that time, the mother continues to nurse, groom, and protect her offspring. It is likey that T. thetis is like other macropods in this respect.
Parental Investment: no parental involvement; altricial ; pre-fertilization (Protecting: Female); pre-hatching/birth (Provisioning: Female, Protecting: Female); pre-weaning/fledging (Provisioning: Female, Protecting: Female); pre-independence (Provisioning: Female)
The red-necked pademelon (Thylogale thetis) is a forest-dwelling marsupial living in the eastern coastal region of Australia between extreme south-east Queensland and central eastern New South Wales.[2]
A small species of macropod, it has a head and body length of 29–62 cm, a tail length of 27–51 cm and mean weight of 3.8 kg for females and 7.0 kg for males.[3] Mainly crepuscular, the red-necked pademelon is very shy and generally inhabits temperate forests near grassland, hiding in the forests by day and emerging into the grasslands to graze in the dusk.[4]
The red-necked pademelon is brown-grey with a cream underbelly and a red-tinted neck and shoulders. It breeds in the autumn and spring in northern Australia, and in the summer in southern Australia. Predators include the dingo and the red fox, however habitat destruction, particularly through land clearance, is currently the largest threat to the species. The red-necked pademelon is not currently listed as an endangered species.
This species is closely related to the red-legged pademelon.
The red-necked pademelon (Thylogale thetis) is a forest-dwelling marsupial living in the eastern coastal region of Australia between extreme south-east Queensland and central eastern New South Wales.
