Home range of male lace monitors, Varanus varius (Reptilia : Varanidae), in south-eastern Australia

1993 ◽  
Vol 20 (3) ◽  
pp. 303 ◽  
Author(s):  
BW Weavers
Keyword(s):  
Home Range ◽  
Sample Size ◽  
Convex Polygon ◽  
Small Sample Size ◽  
Small Sample ◽  
Home Ranges ◽  
South Eastern ◽  
Eastern Australia ◽  
Realistic Description ◽  
South Eastern Australia

Travelling paths and overnight roosts of the lace monitor, Varanus varius, were recorded by radiotracking during periods of up to 19 months in lowland open forest of south-eastern Australia. Home ranges were calculated by four methods: convex polygon (without correction for small sample size), convex polygon (with correction for small sample size), and two 95% probability ellipses. From field observations, I conclude that the convex polygon method without correction for sample size provides the most realistic description of the space used by V. varius. By this method, I calculated a mean (+/- s.d.) home range of 65 +/- 34 ha for 13 male V. varius (mean mass 5.1kg) that were radio-tracked for 2-19 months.

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).

The Effect on Wild Dogs, Canis-F-Familiaris, of 1080-Poisoning Campaigns in Kosciusko-National-Park, Nsw

1986 ◽  
Vol 13 (4) ◽  
pp. 535 ◽  
Author(s):  
JC Mcilroy ◽  
RJ Cooper ◽  
EJ Gifford ◽  
BF Green ◽  
KW Newgrain
Keyword(s):  
National Park ◽  
Home Ranges ◽  
Rapid Loss ◽  
Grazing Land ◽  
Control Zone ◽  
South Eastern ◽  
Eastern Australia ◽  
Radio Transmitters ◽  
Wild Dogs ◽  
South Eastern Australia

Nine wild dogs, Canis f. familiaris, radio-tracked over periods of 28-61 days in Kosciusko National Park, N.S.W., occupied home ranges of 220-5420 ha (mean 2193 ha). These home ranges were similar in size to those observed for dingoes, C. f. dingo, in other areas of south-eastern Australia. The maximum distance that any of the nine dogs moved between successive daily locations was 11.2 km. On the basis of this information and that obtained by others, we suggest that the control of wild dogs on Crown Land in south-eastern Australia should be confined to those areas adjacent to private grazing land. Furthermore, a control zone 12-20 km wide should be adequate. Two successive trail-baiting campaigns with 1080 poison in March and April 1982 killed only two (22%) of the nine wild dogs carrying radio transmitters. Traps, in comparison, caught 15 out of 27 (56%) of the dogs known to be in the area. The main factors which reduced the success of the poisoning campaign were the rapid loss of toxicity of the baits after their distribution, the rapid rate at which they were removed by other animals, particularly foxes Vulpes vulpes and birds, and the dogs' apparent preference for natural prey.

Application of Ultrasound Elastography for Assessing Intestinal Fibrosis in Inflammatory Bowel Disease: Fiction or Reality?

2020 ◽  
Vol 21 ◽  
Author(s):  
Roberto Gabbiadini ◽  
Eirini Zacharopoulou ◽  
Federica Furfaro ◽  
Vincenzo Craviotto ◽  
Alessandra Zilli ◽  
...  
Keyword(s):  
Inflammatory Bowel Disease ◽  
Sample Size ◽  
Bowel Disease ◽  
Small Sample Size ◽  
Shear Wave Elastography ◽  
Small Sample ◽  
Ultrasound Elastography ◽  
Invasive Technique ◽  
Intestinal Fibrosis ◽  
Inflammatory Bowel

Background: Intestinal fibrosis and subsequent strictures represent an important burden in inflammatory bowel disease (IBD). The detection and evaluation of the degree of fibrosis in stricturing Crohn’s disease (CD) is important to address the best therapeutic strategy (medical anti-inflammatory therapy, endoscopic dilation, surgery). Ultrasound elastography (USE) is a non-invasive technique that has been proposed in the field of IBD for evaluating intestinal stiffness as a biomarker of intestinal fibrosis. Objective: The aim of this review is to discuss the ability and current role of ultrasound elastography in the assessment of intestinal fibrosis. Results and Conclusion: Data on USE in IBD are provided by pilot and proof-of-concept studies with small sample size. The first type of USE investigated was strain elastography, while shear wave elastography has been introduced lately. Despite the heterogeneity of the methods of the studies, USE has been proven to be able to assess intestinal fibrosis in patients with stricturing CD. However, before introducing this technique in current practice, further studies with larger sample size and homogeneous parameters, testing reproducibility, and identification of validated cut-off values are needed.

scholarly journals Confirming known planetary trends using a photometrically selected Kepler sample

2020 ◽  
Author(s):  
Jonah T Hansen ◽  
Luca Casagrande ◽  
Michael J Ireland ◽  
Jane Lin
Keyword(s):  
Sample Size ◽  
Robust Statistics ◽  
Narrow Band ◽  
Small Sample Size ◽  
Small Sample ◽  
Fitting Algorithm ◽  
Statistical Studies ◽  
The Rich ◽  
Host Stars ◽  
High Metallicity

Abstract Statistical studies of exoplanets and the properties of their host stars have been critical to informing models of planet formation. Numerous trends have arisen in particular from the rich Kepler dataset, including that exoplanets are more likely to be found around stars with a high metallicity and the presence of a “gap” in the distribution of planetary radii at 1.9 R⊕. Here we present a new analysis on the Kepler field, using the APOGEE spectroscopic survey to build a metallicity calibration based on Gaia, 2MASS and Strömgren photometry. This calibration, along with masses and radii derived from a Bayesian isochrone fitting algorithm, is used to test a number of these trends with unbiased, photometrically derived parameters, albeit with a smaller sample size in comparison to recent studies. We recover that planets are more frequently found around higher metallicity stars; over the entire sample, planetary frequencies are 0.88 ± 0.12 percent for [Fe/H] < 0 and 1.37 ± 0.16 percent for [Fe/H] ≥ 0 but at two sigma we find that the size of exoplanets influences the strength of this trend. We also recover the planet radius gap, along with a slight positive correlation with stellar mass. We conclude that this method shows promise to derive robust statistics of exoplanets. We also remark that spectrophotometry from Gaia DR3 will have an effective resolution similar to narrow band filters and allow to overcome the small sample size inherent in this study.

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