Field Observations on the Common Striped Possum (Dactylopsila Trivirgata) in North Queensland.

1996 ◽  
Vol 23 (6) ◽  
pp. 755 ◽  
Author(s):  
KA Handasyde ◽  
RW Martin
Keyword(s):  
Body Weight ◽  
Home Range ◽  
Foraging Behaviour ◽  
Male Body ◽  
Radio Tracking ◽  
Minimum Convex Polygon ◽  
Far North ◽  
Large Trees ◽  
The Common ◽  
Primary Habitat

Habitat utilisation and foraging behaviour by the common striped possum (Dactylopsila trivirgata) was investigated by means of spotlighting and radio-tracking at Shiptons Flat, far north Queensland. Vine forest was the primary habitat of D. trivirgata; however, animals were also observed in open eucalypt (Eucalyptus tereticornis) woodland. Information collected on foraging behaviour suggests that D. trivirgata are generalist insectivores consuming some fruit and other foodstuffs, such as honey. Radio-tracking data were used to calculate the home-range areas of two subadult males. The home range of the smaller male (body weight 290 g) was 5.2 ha (by the 95% harmonic mean (HM) method) or 6.5 ha (by the minimum convex polygon (MCP) method), and that of the larger male (body weight 415 g) was 21.2 ha (95% HM) or 21.3 ha (MCP). Large trees with hollows, which are utilized for denning, appear to be an important feature of the habitat for this species. D. trivirgata exhibits a pronounced degree of sociality and may breed seasonally. Observations suggest that amethystine pythons (Morelia amethistina) may be major predators of D. trivirgata at Shiptons Flat.

scholarly journals Importance of canopy connectivity for home range and movements of the rainforest arboreal ringtail possum (Hemibelideus lemuroides)

2007 ◽  
Vol 34 (3) ◽  
pp. 177 ◽  
Author(s):  
Robyn F. Wilson ◽  
Helene Marsh ◽  
John Winter
Keyword(s):  
Home Range ◽  
Negative Impact ◽  
Ground Level ◽  
Home Ranges ◽  
Radio Tracking ◽  
Minimum Convex Polygon ◽  
The Road ◽  
North East ◽  
Wide Road ◽  
Ringtail Possum

Roads and powerline corridors destroy canopy connectivity in the rainforest of north-east Australia. We tested the hypotheses that linear barriers affect (a) the alignment of home ranges, (b) use of habitat either side of linear barriers, and (c) the crossing of them by the strictly arboreal lemuroid ringtail possum (Hemibelideus lemuroides), which is known to be vulnerable to habitat fragmentation. Radio-tracking and a translocation experiment were conducted at a narrow 7-m-wide road and an 80-m-wide powerline. Homes ranges of lemuroid ringtails ranged from 0.15 to 1.67 ha (minimum convex polygon) and were aligned with the road but not powerline corridors. When lemuroid ringtails were experimentally translocated, wider canopy clearings over roads reduced their capacity to return to their original home range, and the powerline corridor was a nearly insurmountable barrier. No possums were observed crossing roads or the powerline corridor at ground level or residing in the intervening matrix, indicating that loss of canopy connectivity has a negative impact on their movements.

scholarly journals Home range areas of koalas in an urban area of north-east New South Wales

2014 ◽  
Vol 36 (1) ◽  
pp. 74 ◽  
Author(s):  
Ross L. Goldingay ◽  
Barbara Dobner
Keyword(s):  
Home Range ◽  
Urban Area ◽  
Urban Areas ◽  
Tree Planting ◽  
Home Ranges ◽  
Minimum Convex Polygon ◽  
Phascolarctos Cinereus ◽  
North East ◽  
South Wales ◽  
Primary Habitat

Conserving wildlife within urban areas requires knowledge of habitat requirements and population processes, and the management of threatening factors. The koala (Phascolarctos cinereus) is one species that is adversely affected by urban development. Sick and injured koalas in the Lismore urban area are regularly taken into care. We radio-tracked koalas released from care in order to estimate home-range areas and to determine their fate. Koalas were tracked for periods of 90–742 days; 7 of 10 survived for a period of at least one year. Home ranges defined by the minimum convex polygon (MCP100%) were large (mean ± s.e. = 37.4 ± 8.2 ha). Analysis using the 95% Fixed Kernel revealed home-range areas of 8.0 ± 1.7 ha. Analysis of the habitat composition of each MCP home range showed that they included 4.3 ± 0.9 ha of primary habitat (dominated by their primary food trees). These home ranges contained 27.6 ± 6.8 ha of non-habitat (cleared or developed land). Koalas crossed roads within their home ranges at least 5–53 times; one crossed the Bruxner Highway near a roundabout at least 32 times over his 2-year tracking period. Future management should include strategic food tree planting that enhances habitat connectivity and minimises the risk of car strike or dog attack.

scholarly journals A radio tracking study of home range and movements of the marsupial Micoureus demerarae (Thomas) (Mammalia, Didelphidae) in the Atlantic forest of south-eastern Brazil

2005 ◽  
Vol 22 (1) ◽  
pp. 85-91 ◽  
Author(s):  
Edsel Amorim Moraes Junior ◽  
Adriano Garcia Chiarello
Keyword(s):  
Home Range ◽  
Convex Polygon ◽  
Home Ranges ◽  
Radio Tracking ◽  
Minimum Convex Polygon ◽  
South Eastern ◽  
Live Trapping ◽  
Eastern Brazil ◽  
Data Points ◽  
Biological Reserve

From August 2001 to July 2002 the home range and movements of seven Micoureus demerarae (Thomas, 1905) (three males and four females) were investigated using radio tracking in the União Biological Reserve, state of Rio de Janeiro, south-eastern Brazil. A total of 436 locations was obtained and home range estimated with fixed Kernel (95% of data points), and minimum convex polygon (MCP) methods, with 100 and 95% of data points. Male home ranges estimated by MCP (100%) ranged from 5.4-24.2 ha and females from 0.3-10.7 ha. Corresponding figures calculated with Kernel (95%) were 4-10.9 ha for males and 1.3-5.9 ha for females. Animals travelled on average 423 m/night, with males travelling significantly further (582.8 m/night) than females (335.1 m/night) (t test, t = 3.609, p = 0.001). We concluded that radio tracking produced much larger home ranges than those estimated with traditional live-trapping techniques, suggesting that the latter might underestimate ranging when the area covered with traps is relatively small (ca. 1 ha or less). Radio tracking also indicated that M. demerarae, although predominantly arboreal and weighting only ca. 130 g., has movements similar in magnitude to larger-sized terrestrial didelphimorph marsupials, such as Didelphis Linnaeus, 1758, Philander Linnaeus, 1758 and Metachirus (Desmarest, 1817).

Roosting and Foraging Behavior of the Queensland Tube-Nosed Bat, Nyctimene-Robinsoni (Pteropodidae) - Preliminary Radio-Tracking Observations

1989 ◽  
Vol 16 (4) ◽  
pp. 413 ◽  
Author(s):  
HJ Spencer ◽  
TH Fleming
Keyword(s):  
Small Area ◽  
Foraging Behaviour ◽  
Primary Forest ◽  
Annona Muricata ◽  
Radio Tracking ◽  
Far North ◽  
Fruit Orchard ◽  
Time Of Year ◽  
Fig Trees ◽  
Normal Food

The roosting and foraging behaviour of Nyctimene robinsoni (Chiroptera : Pteropodidae) was studied at Cape Tribulation, far north Queensland, in November and December 1987 using radio-tracking techniques. Bats under and around fruiting sourcop (Annona muricata) trees in a fruit orchard and under cluster fig trees (Ficus spp.) in abandoned pastures were captured with mist nets. Females dominated the captures in the orchard, but the sex ratio was 1 : 1 under cluster fig trees (their presumed normal food). Distances between day-roosting sites and places of capture ranged from 63 to 1012 m. During the day, bats roosted solitarily in the foliage of canopy or understorey trees, usually in primary forest, and most individuals roosted in the same small area for several consecutive days. Except for occasional visits to isolated fruiting trees, individuals foraged at night within 200m of their day roost. The high density of fruiting cluster fig trees in November and December could account for the sedentary behaviour ot this bat at this time of year.

Healthy PNPLA3 Risk Allele Carriers Present with Unexpected Body Fat Composition. A Study of One ousand Subjects

2014 ◽  
Vol 23 (1) ◽  
pp. 33-37 ◽  
Author(s):  
Agnieszka Kempinska-Podhorodecka ◽  
Marcin Krawczyk ◽  
Marta Klak ◽  
Malgorzata Blatkiewicz ◽  
Frank Lammert ◽  
...  
Keyword(s):  
Body Weight ◽  
Liver Disease ◽  
Fatty Liver ◽  
Fatty Liver Disease ◽  
Alcoholic Fatty Liver ◽  
The Metabolic Syndrome ◽  
Anthropometric Characteristics ◽  
The Common ◽  
Total Fat ◽  
Alcoholic Fatty Liver Disease

Introduction: The common PNPLA3 (adiponutrin) variant p.I148M represents a major genetic driver of progression in non-alcoholic fatty liver disease (NAFLD). NAFLD is commonly associated with traits of the metabolic syndrome, therefore it is mostly suspected in obese individuals. Here, we investigate the association between the PNPLA3 variant and anthropometric traits in a cohort of healthy individuals.Patients and methods: We recruited 1,000 (500 females; age 18 - 66 years) healthy blood donors. The PNPLA3 variant was genotyped using TaqMan assays. All individuals were phenotyped with respect to anthropometric characteristics. We also determined the percentage of total fat (F%) and active tissue (TA%) of body weight.Results: Healthy carriers of the PNPLA3 [IM] and [MM] genotypes, although not differing in height from individuals with the genotype [II], displayed significantly lower body weight and lower BMI (both P = 0.005), higher TA% (P = 0.03) but lower F% (P = 0.03) and smaller waist, chest and shin circumferences (all P < 0.05). Separate analysis for males and females demonstrated an association between the [IM] and [MM] genotypes and higher TA% but lower F% (P = 0.04) in females. In males, BMI and total weight were significantly (P = 0.04) lower among carriers of the [M] allele.Discussion: Healthy individuals carrying the prosteatotic PNPLA3 allele p.I48M may be leaner as compared to the carriers of the common allele. Hence in clinical practice they might be overlooked since they do not necessarily present with the anthropometric characteristics commonly associated with severe hepatic steatosis.Abbreviations: ATX - autotaxin; BMI - body mass index; F% - total fat of body weight in %; Fkg - total fat of body weight in kilograms; GWAS - genome-wide association study; LPA - lysophosphatidic acid; NAFLD, non-alcoholic fatty liver disease; NASH - non-alcoholic steatohepatitis; PA - phosphatidic acid; PNPLA3-patatin-like phospholipase domain containing 3 (adiponutrin); TA% - active tissue of body weight in %; TAkg - active tissue of body weight in kilograms; WHR - waist-to-hip ratio.

The influence of roost closure on the roosting and foraging behaviour of Eptesicus fuscus (Chiroptera: Vespertilionidae)

1986 ◽  
Vol 64 (5) ◽  
pp. 1128-1133 ◽  
Author(s):  
R. Mark Brigham ◽  
M. Brock Fenton
Keyword(s):  
Reproductive Success ◽  
Direct Observation ◽  
Foraging Behaviour ◽  
Eptesicus Fuscus ◽  
Maximum Distance ◽  
Radio Tracking ◽  
Site Specific ◽  
Big Brown Bats ◽  
Specific Factors ◽  
Foraging Flight

We used radio tracking and direct observation to determine the effect of roost closure on the roosting and foraging behaviour of big brown bats (Eptesicus fuscus) in maternity colonies near Ottawa. Individuals were site loyal, but after eviction they moved short distances to new roosts where they tended to produce fewer offspring. The time spent on the first foraging flight, the maximum distance travelled, and the use of feeding areas did not change with exclusion. The results suggest that bats roost to take advantage of site-specific factors that may increase reproductive success.

Observations on the behaviour and ecology of the Common Wombat Vombatus ursinus in northeast Tasmania.

1993 ◽  
Vol 16 (1) ◽  
pp. 1
Author(s):  
R.J. Taylor
Keyword(s):  
Home Range ◽  
Agricultural Land ◽  
Social Role ◽  
Mating Behaviour ◽  
Scent Marking ◽  
Average Density ◽  
Home Ranges ◽  
Faecal Pellets ◽  
Common Wombat ◽  
The Common

Aspects of the behaviour and ecology of Vombatus ursinus were studied in largely cleared agricultural land in a coastal area in northeast Tasmania. The average density of V. ursinus was 20 individuals.km-2 over the whole study area but around 60.km-2 in an intensively studied section. Burrows were concentrated in areas of sandy soil where a dense cover of native vegetation had been maintained. Only short, shallow burrows were present in areas of dolerite, probably because of the difficulty of digging. Home-ranges of different individuals overlapped. Wombats were not active continually through the night and varied in time of emergence from their burrow and the time spent above ground. Often more than one burrow was used on the same night, with more than one individual making use of a burrow, but usually not at the same time. Disputes over the use of burrows occurred. Individuals frequently sniffed around burrows and investigated for the presence of occupants. Males may use this as a strategy for finding females in oestrus. Mating behaviour was observed once. Wombats are solitary and actively avoid the presence of others. Odour in faecal pellets and from scent marking probably plays an important social role by providing information on the individuals sharing a home-range and the occurrence of strangers. Dominant animals may be intolerant of the presence of certain individuals within their home-range.

scholarly journals Home range and activity of African goshawks Accipiter tachiro in relation to their predation on bats

Koedoe ◽  
1990 ◽  
Vol 33 (2) ◽  
Author(s):  
I.L. Rautenbach ◽  
M.B. Fenton ◽  
A.C. Kemp ◽  
S.J. Van Jaarsveld
Keyword(s):  
Home Range ◽  
Adult Female ◽  
Sex Ratios ◽  
Home Ranges ◽  
Radio Tracking ◽  
High Fecundity ◽  
Previous Summer

Winter radio-tracking of three African goshawks Accipiter tachiro showed that they each occupied well-wooded home ranges of at least 28 hectares. They perched and roosted mainly within densely foliaged trees and an adult female changed perches on average 4,7 times per hour. No crepuscular predation of bats was recorded, in contrast to regular summer predation on colonies of little free-tailed bats, Tadarida pumila, but winter emergence rates of these bats at dusk had dropped to < 5 of the previous summer. We predict that many accipiters will be regular predators of bats and that skewed sex ratios and high fecundity may be two means by which bats counter this predation.

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