scholarly journals Use of space by neotropical marsupial Didelphis albiventris (Didelphimorphia: Didelphidae) in an urban forest fragment

2008 ◽  
Vol 25 (2) ◽  
pp. 214-219 ◽  
Author(s):  
Alex J. de Almeida ◽  
Camila G. Torquetti ◽  
Sônia A. Talamoni
Keyword(s):  
Population Structure ◽  
Sexual Dimorphism ◽  
Home Range ◽  
Habitat Use ◽  
Urban Forest ◽  
Conservation Status ◽  
Forest Fragment ◽  
Mean Size ◽  
The Mean ◽  
Didelphis Albiventris

A population of the Neotropical marsupial Didelphis albiventris (Lund, 1840) living in an urban forest fragment was studied. Population structure and the influence of sex and age on two variables related to habitat use (Daily home range - MCP and Habitat use intensity - UI) obtained by the spool-and-line technique were analysed. There were 20 males and 29 females studied (N = 49). No sexual dimorphism was apparent in adult individuals. There were 16 males and 24 females tracked using the spool-and-line device. There were significant differences found in the mean size of the daily home range, which was greater in adults than in sub-adults. Regarding the habitat use intensity there were also significant differences related to age. There were no significant differences in MCP and UI related to the sex of the individuals. Besides the analyzed factors, the variables related to habitat use are possibly influenced by other factors, especially, the ones related to the conservation status of the fragment.

scholarly journals Radiotelemetry of a female jaú, Zungaro jahu (Ihering, 1898) (Siluriformes: Pimelodidae), passed upstream of Funil Dam, rio Grande, Brazil

2007 ◽  
Vol 5 (2) ◽  
pp. 229-232 ◽  
Author(s):  
Carlos Bernardo Mascarenhas Alves ◽  
Luiz Gustavo Martins da Silva ◽  
Alexandre Lima Godinho
Keyword(s):  
Home Range ◽  
Habitat Use ◽  
Transition Zone ◽  
Conservation Status ◽  
Rio Grande ◽  
Diel Activity ◽  
Main Body ◽  
Daytime Activity ◽  
The Times ◽  
Migratory Movements

Jaú, Zungaro jahu (Ihering, 1898), a large migratory catfish endemic to the rio da Prata basin, has a fragile conservation status and its ecology is poorly known. We radio-tracked a female jaú with a total length of 1.5 m that was passed upstream of Funil Dam, rio Grande, to describe its migratory movements, habitat use, linear home range, and diel activity. To track the fish, we made five tracking trips in the period from April, 2003 to January, 2004. In addition to the main body of Funil Reservoir, the fish also used a reservoir-river transition zone located in a branch of Funil Reservoir that flooded part of rio das Mortes. Most of the times, we found the fish in the former beds of streams flooded by the reservoir, at depths that ranged from 8-9 m in the reservoir-river transition zone to 18-21 m in Funil Reservoir. Linear home range of the fish was 31.4 km. The onset of activity occurred early in the evening, but we also detected daytime activity. The conclusion from our study was that the passed adult female jaú used reservoir habitats, migrated between the main body and the reservoir-river transition zone, preferred deep habitats, showed a relatively short home range, and had diurnal and nocturnal activities.

scholarly journals Home range sizes for burchell's zebra equus burchelli antiquorum from the Kruger National Park

Koedoe ◽  
1975 ◽  
Vol 18 (1) ◽  
Author(s):  
G.L. Smuts
Keyword(s):  
Home Range ◽  
National Park ◽  
Kruger National Park ◽  
Home Ranges ◽  
Equus Burchelli ◽  
Kruger Park ◽  
Mean Size ◽  
Large Home Range ◽  
The Mean ◽  
Specific Tolerance

Annual home range sizes were determined for 49 marked zebra family groups in the Kruger National Park. Sizes varied from 49 to 566 sq. km, the mean for the Park being 164 square kilometre. Mean home range sizes for different zebra sub-populations and biotic areas were found to differ considerably. Present herbivore densities have not influenced intra- and inter-specific tolerance levels to the extent that home range sizes have increased. Local habitat conditions, and particularly seasonal vegetational changes, were found to have the most profound influence on the shape and mean size of home ranges. The large home range sizes obtained in the Kruger Park, when compared to an area such as the Ngorongoro Crater, can be ascribed to a lower carrying capacity with respect to zebra, large portions of the habitat being sub-optimal, either seasonally or annually.

scholarly journals Movements and habitat use of the invasive species Lithobates catesbeianus in the valley of the Grote Nete (Belgium)

2020 ◽  
Vol 146 (2) ◽  
Author(s):  
Sarah Descamps ◽  
Alain De Vocht
Keyword(s):  
Invasive Species ◽  
Home Range ◽  
Habitat Use ◽  
Lithobates Catesbeianus ◽  
Radio Transmitter ◽  
American Bullfrog ◽  
The Mean ◽  
One Year ◽  
Eutrophic Ponds ◽  
Alluvial Forest

Nine adult American bullfrogs (Lithobates catesbeianus) were tagged with an internal radio transmitter and tracked during one year in the valley of the Grote Nete (Belgium). The mean ± SD core range area (KDE50) was 15.00 ± 22.41m2. The home range area (KDE95) had a mean ± SD of 429.78 ± 510.97m2. Shores of larger eutrophic ponds and small temporary pools in alluvial forest were chosen as habitat. The total area used (MCP95) had a mean of 11,086.73 ± 12,239.00m2. The study revealed a mean action radius of 270.78 ± 199.17m and individuals moved up to 742m in a single displacement. These results show that the dispersion of the American bullfrog in a valley system such as the Grote Nete can proceed very rapidly. A positive correlation between weight and distance covered within one movement was found, which could suggest that dominant individuals are capable of covering greater distances in search of optimal habitat for reproduction, foraging or hibernation.

Summer-Autumn home range and habitat use of the Hastings River mouse Pseudomys oralis (Rodentia: Muridae).

2006 ◽  
Vol 28 (1) ◽  
pp. 39 ◽  
Author(s):  
P. D. Meek ◽  
S. L. Radford ◽  
B. L. Tolhurst
Keyword(s):  
Home Range ◽  
Habitat Use ◽  
New South ◽  
Home Range Size ◽  
Short Term ◽  
Minimum Convex Polygon ◽  
Nest Sites ◽  
South Wales ◽  
Significant Difference ◽  
The Mean

Individuals from a population of Hastings River mouse (Pseudomys oralis) were radio tracked in a short-term investigation of home range, habitat use and movement patterns in Marengo State Forest on the northern tablelands of New South Wales. Results were assessed in the context of conservation and management of this threatened species and compared to research in other parts of the species? distribution. The mean summer-autumn home range (Minimum Convex Polygon) of five animals that met the home range asymptote was 0.78�ha, the minimum home range for fourteen mice was 0.72�ha, while median home range for males was 0.8�ha and females 0.53�ha. There was no significant difference in home range size between sexes. Habitat data indicated that fallen logs, including tree head and butt residue following logging, are important refuge and nest sites, even when rocks and hollows are available. A diversity of fern and other ground plant species (including grasses) was important habitat for the species, microhabitat consisting predominantly of sedge and rush was not favoured.

scholarly journals Home range and habitat use by pacas in a montane tropical forest in Bolivia

2017 ◽  
Vol 47 (3) ◽  
pp. 227-236 ◽  
Author(s):  
Camila BENAVIDES ◽  
Alejandro ARCE ◽  
Luis F. PACHECO
Keyword(s):  
Home Range ◽  
Habitat Use ◽  
Secondary Forest ◽  
Agroforestry Systems ◽  
Minimum Convex Polygon ◽  
Forest Patches ◽  
La Paz ◽  
Agricultural Community ◽  
The Mean ◽  
Montane Tropical Forest

ABSTRACT We studied the home range and habitat use of paca (Cuniculus paca) in a rural agricultural community in the Alto Beni region, in La Paz department, Bolivia, where game meat is the main source of protein for a large portion of local inhabitants. We captured and radio collared five individual paca (4 females and 1 male), which were followed for six months in 2012 to estimate home range of the individuals and assess their habitat use and selection. The total mean home range (95% Minimum Convex Polygon) was 2.26 ha (SD = 0.80), and ranged from 1.5 to 2.96 ha. The mean female home range (2.04 ha) was smaller than the male´s (2.95 ha). Pacas used two (crops and fallows) of the three available habitats (secondary forest patches), and appeared to positively select crops over the other two. The importance of crops may be linked to the type of agriculture conducted in the area (i.e. mainly cacao in agroforestry systems), which may offer more food and shelter for pacas. Given that, the importance of habitats may change seasonally; this topic should be examined in future studies. Our results suggest that agroforestry systems may be important for the species since they offer a variety of food resources throughout the year.

scholarly journals Habitat use by a tree frog species of Scinax (Amphibia, Hylidae) at an urban forest fragment from south-eastern Brazil

2008 ◽  
Vol 98 (3) ◽  
pp. 412-415
Author(s):  
Conrado A. B. Galdino ◽  
Ronald R. Carvalho Jr. ◽  
Mauren A. V. Noronha e Menezes ◽  
Luciana B. Nascimento
Keyword(s):  
Habitat Use ◽  
Urban Forest ◽  
Species Abundance ◽  
Southeastern Brazil ◽  
Tree Frog ◽  
Forest Fragment ◽  
Eastern Brazil ◽  
Frog Species ◽  
Spatial Niche ◽  
Belo Horizonte

We studied the pattern of habitat use by the tree frog Scinax aff. perereca. Fieldworks were performed from August 1996 to August 1997 at Parque das Mangabeiras, Belo Horizonte, State of Minas Gerais, southeastern Brazil. Calling males were observed in September, October and December 1996, February to April and June 1997. Females were found only in October 1996. Specimens were found perched on vegetation, on the ground or on stones near waterfall. At Parque das Mangabeiras, S. aff. perereca occupied nine types of substrata. The most frequently used substrata were shrubs, stones at the stream edges, and fallen trunks. The pattern of spatial occupation varied among months. Males were found calling in aggregations on the vegetation and spatial niche breadth was related to species abundance.

scholarly journals Potential seed dispersal by Didelphis albiventris (Marsupialia, Didelphidae) in highly disturbed environment

2010 ◽  
Vol 10 (2) ◽  
pp. 45-51 ◽  
Author(s):  
Mauricio Cantor ◽  
Letícia Andrade Ferreira ◽  
Wesley Rodrigues Silva ◽  
Eleonore Zulnara Freire Setz
Keyword(s):  
Plant Species ◽  
Urban Forest ◽  
Forest Fragments ◽  
Forest Fragment ◽  
Generalist Species ◽  
Logistic Regression Models ◽  
Disturbed Areas ◽  
Pioneer Plants ◽  
Tolerant Animal ◽  
Didelphis Albiventris

Urban forests are usually isolated and highly disturbed, however they are important shelters for tolerant animal species. Their food habits expose the different ecological roles these animals perform in the habitat. We analyzed the contribution of Didelphis albiventris Lund (1840), as a seed disperser, to the vegetation renewal of an urban forest fragment, describing its frugivorous diet and testing the viability of ingested seeds. Both male and female of white-eared opossum included a vast variety of items in their diet, mainly invertebrates and fruits. Fruits were consumed during all year round and seasonality was not observed. The majority of consumed fruits was from pioneer plant species, which is common in disturbed areas, in accordance to the opossum's opportunistic habits. The viability of ingested seeds, evaluated by linear logistic regression models applied to data from germination tests, was different of the seeds collected directly from ripe fruits; it varied among species, maybe due to the intrinsic characteristics of plant species. As a highly generalist species, D. albiventris can inhabit disturbed environments and then disperse seeds from pioneer plants, where the vegetation must be restored. It is crucial that this process does not depend only on the specialist frugivores, which are frequently absent in urban forest fragments. Therefore, the presence of generalist species of secondary environments has its importance emphasized.

Home range and habitat use of Trumpeter Hornbills Bycanistes bucinator in an urban–forest mosaic, Eshowe, South Africa

Ostrich ◽  
2017 ◽  
Vol 88 (3) ◽  
pp. 225-233 ◽  
Author(s):  
Moses Chibesa ◽  
Barry Taylor ◽  
Tharmalingam Ramesh ◽  
Colleen T Downs
Keyword(s):  
South Africa ◽  
Home Range ◽  
Habitat Use ◽  
Urban Forest ◽  
Forest Mosaic

Batch Precipitation of Lead Iodide

1994 ◽  
Vol 59 (6) ◽  
pp. 1301-1304
Author(s):  
Jaroslav Nývlt ◽  
Stanislav Žáček
Keyword(s):  
Aqueous Solution ◽  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Crystal Size ◽  
Lead Nitrate ◽  
Lead Iodide ◽  
Constant Rate ◽  
Mean Size ◽  
The Mean

Lead iodide was precipitated by a procedure in which an aqueous solution of potassium iodide at a concentration of 0.03, 0.10 or 0.20 mol l-1 was stirred while an aqueous solution of lead nitrate at one-half concentration was added at a constant rate. The mean size of the PbI2 crystals was determined by evaluating the particle size distribution, which was measured sedimentometrically. The dependence of the mean crystal size on the duration of the experiment exhibited a minimum for any of the concentrations applied. The reason for this is discussed.

Sign in / Sign up

Export Citation Format

Share Document