Differing effects of productivity on home-range size and population density of a native and an invasive mammalian carnivore

2021 ◽  
pp. NULL
Author(s):  
Rowena P. Hamer ◽  
Georgina E. Andersen ◽  
Bronwyn A. Hradsky ◽  
Shannon N. Troy ◽  
Riana Z. Gardiner ◽  
...  
Keyword(s):  
Population Density ◽  
Home Range ◽  
Home Range Size ◽  
Range Size

Desert kit fox home range – southeastern California

2015 ◽  
Vol 61 (3-4) ◽  
pp. 157-161
Author(s):  
Charles J. Randel ◽  
Nova J. Silvy
Keyword(s):  
Life History ◽  
Population Density ◽  
Home Range ◽  
Great Basin ◽  
Central Valley ◽  
Home Range Size ◽  
Range Size ◽  
Minimum Convex Polygon ◽  
Kit Fox ◽  
Open Population

Kit fox (Vulpes macrotis) life history and ecology has been extensively studied in the Great Basin and California's Central Valley, with fewer studies in hot desert regions resulting in regional knowledge gaps. To augment our understanding of kit fox life history and ecology, we conducted a 2-year radio-telemetry study of the desert kit fox (V. m. arsipus) in southeastern California. Fifty-six desert kit foxes were fitted with morality-sensitive radio collars between October 2012 and August 2014 with individuals located five to seven nights per week to determine home range size and population density. Mean home range was 15.77 ± 1.03 km2 (95% fixed kernel) and 18.48 ± 1.77 km2 (minimum convex polygon), and larger than all, but one previous study. We found no difference in home range size based on sex or year. Home range overlaps were significantly larger for mated (79.3% ± 1.35%) than unmated pairs (20.9% ± 1.01%) and consistent with previous studies. Population size was estimated at 88 individuals using open population models, resulting in an estimated density of 0.34/km2 (range 0.26–0.47/km2) which is higher than previously reported. Our study represents the first home range and population density study for desert kit foxes in California and provided critical knowledge of this understudied kit fox population.

Investigating brushtail possum (Trichosurus vulpecula) home-range size determinants in a New Zealand native forest

2017 ◽  
Vol 44 (4) ◽  
pp. 316 ◽  
Author(s):  
K. S. Richardson ◽  
C. Rouco ◽  
C. Jewell ◽  
N. P. French ◽  
B. M. Buddle ◽  
...  
Keyword(s):  
New Zealand ◽  
Population Density ◽  
Home Range ◽  
Disease Transmission ◽  
Home Range Size ◽  
Range Size ◽  
Home Ranges ◽  
Native Forest ◽  
Trichosurus Vulpecula ◽  
Age And Sex

Context The Australian brushtail possums (Trichosurus vulpecula) introduction to New Zealand has exacted a heavy toll on native biodiversity and presented the country with its greatest wildlife reservoir host for bovine tuberculosis (TB). Management efforts to control both possums and TB have been ongoing for decades, and the biology of possums has been studied extensively in Australia and New Zealand over the past 50 years; however, we still do not have a clear understanding of its home-range dynamics. Aims To investigate determinants of home range size by using a uniquely large dataset in the Orongorongo Valley, a highly monitored research area in New Zealand and compare our findings with those of other studies. Methods Possum density was estimated, for subpopulations on four 13-ha cage-trap grids, by the spatially explicit capture–mark–recapture analysis of trapping data from 10 consecutive months. Home ranges were estimated from trap locations using a 100% minimum convex polygon (MCP) method for 348 individuals and analysed with respect to grid, age and sex. Key results Mean (standard error) possum density, estimated as 4.87 (0.19), 6.92 (0.29), 4.08 (0.21) and 4.20 (0.19) ha–1 for the four grids, was significantly negatively correlated with mean MCP home-range size. Grid, age, and the interaction of age and sex were significantly related to home-range size. Older possums had larger home ranges than did younger possums. When ‘juvenile cohort’ and ‘adult cohort’ data were analysed separately, to investigate the significant interaction, males in the ‘adult cohort’ had significantly larger home ranges than did females, with the grid effect still being apparent, whereas neither sex nor grid effects were significant for the ‘juvenile cohort’. Conclusions Our findings indicate that, in addition to density, age and sex are likely to be consistent determinants of possum home-range size, but their influences may be masked in some studies by the complexity of wild-population dynamics. Implications Our findings have strong implications regarding both disease transmission among possums and possum management. The fact that adult males occupy larger home ranges and the understanding that possum home range increases as population density decreases are an indication that males may be the primary drivers of disease transmission in possum populations. The understanding that possum home range increases as population density decreases could be a direct reflection of the ability of TB to persist in the wild that counteracts current management procedures. If individuals, and particularly males, infected with TB can withstand control measures, their ensuing home-range expansion will result in possible bacteria spread in both the expanded area of habitation and new individuals becoming subjected to infection (both immigrant possums and other control survivors). Therefore, managers should consider potential approaches for luring possum males in control operations.

Patch use by the greater glider (Petauroides volans) in a fragmented forest ecosystem. I. Home range size and movements

2004 ◽  
Vol 31 (6) ◽  
pp. 559 ◽  
Author(s):  
M. L. Pope ◽  
D. B. Lindenmayer ◽  
R. B. Cunningham
Keyword(s):  
Population Density ◽  
Home Range ◽  
Patch Size ◽  
Home Range Size ◽  
Range Size ◽  
Home Ranges ◽  
Home Range Overlap ◽  
Eastern Australia ◽  
Core Areas ◽  
Range Overlap

This paper examines home-range attributes of 40 greater gliders (Petauroides volans) in five patches of remnant eucalypt forest surrounded by stands of radiata pine (Pinus radiata) near Tumut in south-eastern Australia. Fixed-kernel smoothing methods were used to estimate home-range size for P. volans. For males, home-range size varied from 1.38–4.10 ha (mean = 2.6 ± 0.8 ha, n = 12) and was significantly larger (P < 0.05) than for females (1.26–2.97 ha, mean = 2.0 ± 0.6 ha, n = 11). Home-range size increased significantly with increasing patch size and reduced patch population density. Thus, small patches had more animals per unit area with smaller home ranges and greater home-range overlap. Our findings illustrate flexibility in the use of space by P. volans. Such results have not previously been reported for P. volans or any other species of arboreal marsupial. Considerable home-range overlap (at 95th percentile isopleth level) was observed between male and female P. volans. Pairs of females also exhibited home-range overlap. Males tended to maintain home ranges exclusive of other males, although some shared common areas. Contrary to the large variations observed in home-range area, core areas (50th isopleth) remained relatively constant, regardless of patch size, population density or sex. This may indicate that core areas are an essential requirement for individuals and resources they contain cannot be shared with congeners.

scholarly journals Whitebark Pine, Population Density, and Home-Range Size of Grizzly Bears in the Greater Yellowstone Ecosystem

PLoS ONE ◽  
2014 ◽  
Vol 9 (2) ◽  
pp. e88160 ◽  
Author(s):  
Daniel D. Bjornlie ◽  
Frank T. Van Manen ◽  
Michael R. Ebinger ◽  
Mark A. Haroldson ◽  
Daniel J. Thompson ◽  
...  
Keyword(s):  
Population Density ◽  
Home Range ◽  
Home Range Size ◽  
Range Size ◽  
Grizzly Bears ◽  
Greater Yellowstone Ecosystem ◽  
Whitebark Pine ◽  
Greater Yellowstone

Feral cat home-range size varies predictably with landscape productivity and population density

2015 ◽  
Vol 298 (2) ◽  
pp. 112-120 ◽  
Author(s):  
A. J. Bengsen ◽  
D. Algar ◽  
G. Ballard ◽  
T. Buckmaster ◽  
S. Comer ◽  
...  
Keyword(s):  
Population Density ◽  
Home Range ◽  
Home Range Size ◽  
Range Size ◽  
Feral Cat
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