Home ranges of Guiana dolphins (Sotalia guianensis) (Cetacea: Delphinidae) in the Cananéia estuary, Brazil

2010 ◽  
Vol 90 (8) ◽  
pp. 1641-1647 ◽  
Author(s):  
Júlia Emi de Faria Oshima ◽  
Marcos César de Oliveira Santos ◽  
Mariel Bazzalo ◽  
Paulo André de Carvalho Flores ◽  
Fabiano do Nascimento Pupim
Keyword(s):  
Home Range ◽  
Kernel Method ◽  
Band Width ◽  
Density Estimator ◽  
Home Ranges ◽  
Cetacean Species ◽  
Data Set ◽  
Photo Identification ◽  
Sotalia Guianensis ◽  
Fixed Kernel

Home ranges of seven Guiana dolphins (Sotalia guianensis) (Van Bénéden, 1864) were studied in the Cananéia estuary (~25°03′S 47°55′W), south-eastern Brazil. Boat-based observations were conducted from May 2000 to July 2003 in ~132 km2 of protected inner waters. The photo-identification technique was used to follow naturally marked individuals through time and space. From a total of 138 catalogued individuals, five males and two females presented 20+ sightings and were used for home range estimation. Sightings were plotted and analysed in a Geographic Information System (GIS). With the ‘Home Range Tools’ extension the fixed kernel density estimator with band width (smoothing parameter) chosen via least squares cross-validation was performed for each individual. The fixed kernel method was used to estimate the non-parametric utility distribution of each dolphin, keeping band width (h) constant for a data set. The first polygons created by these parameters had an amoeboid shape and in some cases more than one centre of activity. The 95% home range estimated outlines varied from 1.6 to 22.9 km2 (7.9 ± 8.3 km2). This large interval shows strong evidences on individual variation in S. guianensis' home ranges. Several individuals showed small home ranges when compared to other cetacean species. An overlap of home ranges of different sizes and shapes were observed for Guiana dolphins with large range movements. Centres of activity were concentrated in the main entrance of the Cananéia estuary. This was a first attempt to understand the way S. guianensis uses the Cananéia estuary and such data are essential for conservation and management purposes.

scholarly journals Guiana dolphin home range analysis based on 11 years of photo-identification research in a tropical estuary

2016 ◽  
Vol 97 (2) ◽  
pp. 599-610 ◽  
Author(s):  
Júlia Emi de Faria Oshima ◽  
Marcos César de Oliveira Santos
Keyword(s):  
Home Range ◽  
Habitat Use ◽  
Least Squares ◽  
Cross Validation ◽  
Individual Identification ◽  
Southeastern Brazil ◽  
Home Ranges ◽  
Photo Identification ◽  
Sotalia Guianensis ◽  
Fixed Kernel

Abstract Home range studies provide significant insights on social organization and interactions, limiting resources and habitat use. Knowledge on home range and habitat use by Guiana dolphins, Sotalia guianensis , is still scarce. The aim of this study was to identify and analyze individual’s home ranges of Guiana dolphins in the Cananéia Estuary (~25°03′S, 47°55′W), located in southeastern Brazil. Photo-identification efforts were conducted between 2000 and 2010. From a total of 135,918 pictures taken, 34,086 (25%) were useful for individual identification. Two-hundred and five individuals were cataloged based on permanent notches along dorsal fin borders. Of the cataloged individuals, 31 had been identified a minimum of 20 times, on distinct dates, prior to this analysis. Home ranges were estimated for these individuals using 4 methods: minimum convex polygon (MCP), adaptive kernel with least-squares cross-validation (AKLSCV), fixed kernel with reference bandwidth (FKHREF), and fixed kernel with least-squares cross-validation (FKLSCV). The sizes of the estimated home ranges varied between 2.2 and 43.8 km 2 ( X¯ = 17.5 km 2 ) with MCP, between 0.8 and 82.5 km 2 ( X¯ = 15.6 km 2 ) with AKLSCV, between 3.9 and 244 km 2 ( X¯ = 72.4 km 2 ) with FKHREF, and from 0.6 to 70.6 km 2 ( X¯ = 13.5 km 2 ) with FKLSCV. Significant differences in size and shape of the generated areas were detected when comparing the 4 tested methods. Variation of individual’s home range sizes and an extensive overlap among home ranges of different Guiana dolphins in the Cananéia Estuary provide evidence that the region supports important resources for this species. Therefore, preventing habitat loss in this region is essential to guaranteeing the persistence of this population. O estudo sobre o uso de área pode fornecer informações sobre organização social e interações, recursos limitantes e sobre o uso de habitat. Ainda é escasso o conhecimento sobre como o boto-cinza, Sotalia guianensis usa seu habitat. O objetivo deste estudo foi identificar e analisar as áreas de uso individuais de S. guianensis no estuário de Cananéia (~25°03′S; 47°55′W), localizado no sudeste brasileiro. Os esforços de foto-identificação foram realizados entre os anos de 2000 e 2010. De um total de 135.918 fotografias tomadas, 34.086 (25%) foram úteis para identificações individuais. Duzentos e cinco indivíduos foram catalogados através das marcas permanentes presentes em suas nadadeiras dorsais. Dentre os indivíduos catalogados, 31 foram identificados ao menos em 20 ocasiões, em dias distintos, antes destas análises. As áreas de uso foram estimadas para estes indivíduos utilizando quatro métodos distintos: mínimo polígono convexo (MPC), kernel adaptativo com largura determinada pelo método de validação cruzada de quadrados mínimos (AKLSCV), kernel fixo com largura de referência (FKHREF) e kernel fixo com largura determinada pelo método de validação cruzada de quadrados mínimos (FKLSCV). Os tamanhos das áreas de uso geradas variaram entre 2,2 e 43,8 km 2 ( X¯ = 17,5 km 2 ) com o uso do MPC, 0,8 e 82,5 km 2 ( X¯ = 15,6 km 2 ) com o uso do AKLSCV, 3,9 e 244 km 2 ( X¯ = 72,4 km 2 ) com o uso do FKHREF, e de 0,6 a 70,6 km 2 ( X¯ = 13,5 km 2 ) com o uso do FKLSCV. Foram detectadas diferenças significativas no tamanho e formato das áreas geradas pelos quatro métodos testados. Variações nos tamanhos das áreas de uso individuais e a extensa sobreposição entre diferentes áreas de uso dos botos-cinza no estuário de Cananéia fornecem evidências de que a região provê recursos importantes para esta espécie. Portanto, prevenir a perda de habitat na região é essencial para garantir a persistência dessa população.

Allometry of home range size in lake and river fishes

1995 ◽  
Vol 52 (7) ◽  
pp. 1499-1508 ◽  
Author(s):  
Charles K. Minns
Keyword(s):  
Body Size ◽  
Home Range ◽  
Freshwater Fish ◽  
Fish Population ◽  
Home Range Size ◽  
Range Size ◽  
Territory Size ◽  
Home Ranges ◽  
Data Set ◽  
Terrestrial Mammals

A data set assembled from published literature supported the hypotheses that (i) home range size increases allometrically with body size in temperate freshwater fishes, and (ii) fish home ranges are larger in lakes than rivers. The allometric model fitted was home range = A∙(body size)B. Home ranges in lakes were 19–23 times larger than those in rivers. Additional analyses showed that membership in different taxonomic groupings of fish, the presence–absence of piscivory, the method of measuring home range, and the latitude position of the water bodies were not significant predictive factors. Home ranges of freshwater fish were smaller than those of terrestrial mammals, birds, and lizards. Home ranges were larger than area per fish values derived by inverting fish population and assemblage density–size relationships from lakes and rivers and territory–size relationships in stream salmonids. The weight exponent (B) of fish home range was lower than values reported for other vertebrates, 0.58 versus a range of 0.96–1.14. Lake–river home range differences were consistent with differences reported in allometric models of freshwater fish density and production.

Home range and diet of feral cats in Hawaii forests

2000 ◽  
Vol 6 (3) ◽  
pp. 229 ◽  
Author(s):  
Ty D. Smucker ◽  
Gerald D. Lindsey ◽  
Stephen M. Mosher
Keyword(s):  
Home Range ◽  
Kernel Method ◽  
Felis Catus ◽  
Dry Forest ◽  
Home Ranges ◽  
Regular Component ◽  
Ecological Data ◽  
Feral Cat ◽  
Adaptive Kernel ◽  
Adult Cats

Feral cat Felis catus home range in a Hawaiian montane wet forest and their diet in three habitats - montane wet forest, subalpine dry forest, and lowland dry forest ? were determined to provide baseline ecological data and to assess potential impacts to native terrestrial fauna. Seven cats (three males and four females) were captured in 624 trap nights. Mean weight of adult cats was 2.85 � 0.27 (SE) kg for males and 1.87 � 0.03 kg for females. Mean diurnal home range using the adaptive kernel method was 5.74 � 2.73 km2 for three males and 2.23 � 0.44 km2 for two females. Daytime locations were always within the montane wet forest with the borders on one or more sides of the home ranges of all cats defined by open grassland pastures. Rodents comprised the majority of the cat diets in all three habitats, with the frequencies of occurrence between 0.88 and 0.91. Bird remains were a regular component of the diet of cats, with montane wet forest having the highest frequency of occurrence (0.68), followed by subalpine dry forest (0.53). and lowland dry forest (0.21).

scholarly journals Space use and movement of jaguar (Panthera onca) in western Paraguay

Mammalia ◽  
2018 ◽  
Vol 82 (6) ◽  
pp. 540-549 ◽  
Author(s):  
Roy T. McBride ◽  
Jeffrey J. Thompson
Keyword(s):  
Confidence Interval ◽  
Home Range ◽  
Hydrological Cycle ◽  
Home Range Size ◽  
Density Estimator ◽  
Home Ranges ◽  
Panthera Onca ◽  
Core Areas ◽  
Brazilian Pantanal

AbstractHome range and core area size were estimated for jaguar (Panthera onca) in western Paraguay in the Dry Chaco, Humid Chaco and Pantanal using an autocorrelated kernel density estimator. Mean home range size was 818 km2(95% confidence interval: 425–1981) in the Dry Chaco and 237 km2(95% confidence interval: 90–427) in the Humid Chaco/Pantanal. Core areas, defined as the home range area where use was equal to expected use, was consistent across sexes and systems represented on average by the 59% home range isopleth (range: 56–64%). Males had a higher probability of larger home ranges and more directional and greater daily movements than females collectively and within systems. The large home ranges in the Dry Chaco are attributable to the relatively low productivity of that semi-arid ecosystem and high heterogeneity in resource distribution while larger than expected home ranges in the Humid Chaco/Pantanal compared to home range estimates from the Brazilian Pantanal may be due to differences in geomorphology and hydrological cycle. The large home ranges of jaguars in western Paraguay and a low proportional area of protected areas in the region demonstrate the importance of private ranchland for the long-term conservation of the species.

Home ranges, time budgets and food-tree use in a high-density tropical population of greater gliders, Petauroides volans minor (Pseudocheiridae : Marsupialia)

1996 ◽  
Vol 23 (4) ◽  
pp. 401 ◽  
Author(s):  
SS Comport ◽  
SJ Ward ◽  
WJ Foley
Keyword(s):  
Population Density ◽  
Home Range ◽  
Kernel Method ◽  
Radio Telemetry ◽  
High Population ◽  
Home Ranges ◽  
Time Budgets ◽  
High Population Density ◽  
Mean Values ◽  
Males And Females

The socio-ecology of Petauroides volans has been studied for subtropical and temperate populations, but not for the northern tropical subspecies, Petauroides volans minor. Data on the effects of a high population density on home ranges, time budgets and food-tree use were obtained by means of radio-telemetry. Three techniques were used to estimate home-range area (kernel, MCP and harmonic mean) and the kernel method was preferred. Estimates of home-range area (defined by the 95% kernel) gave mean values of 2.5 and 1.3 ha for males and females, respectively. Broad overlap of home ranges of males was observed, which has not been reported previously for populations of P. volans. Behaviour patterns for males and females were similar to those in previous studies, although the mating system may differ, possibly because of the high population density. Dietary patterns were similar to those previously reported for this species, the most important food items being young leaves and flower buds of particular eucalypt species, notably Eucalyptus acmenoides.

scholarly journals Seasonal variations in spatial usage by the estuarine dolphin, Sotalia guianensis (van Bénéden, 1864) (Cetacea; Delphinidae) at its southern limit of distribution

2007 ◽  
Vol 67 (1) ◽  
pp. 1-8 ◽  
Author(s):  
LL. Wedekin ◽  
FG. Daura-Jorge ◽  
VQ. Piacentini ◽  
PC. Simões-Lopes
Keyword(s):  
Home Range ◽  
Group Home ◽  
Home Ranges ◽  
Southern Limit ◽  
Daily Group ◽  
Sotalia Guianensis ◽  
Protection Area ◽  
Core Areas ◽  
Estuarine Dolphin ◽  
And Control

The use of space by the resident population of estuarine dolphins (Sotalia guianensis) in Norte Bay, southern Brazil was studied by boat surveys between 2000 and 2003. Data such as the geographical position and group size was collected at 5-minute intervals using focal-group sampling. The distribution and seasonal and daily group home-ranges were estimated using a GIS (Geographic Information System) environment. The dolphins did not use the area homogeneously, restricting their activities to a well-defined area located in the western part of the bay, while the use of the eastern part was not observed. A discrepancy between the Environment Protection Area of Anhatomirim, created especially to protect this population and the distribution of the dolphins was observed. Seasonal group home-range varied both qualitatively and quantitatively among the four consecutive seasons analyzed. The dolphins tended to use a larger area in cold seasons, when apparently the abundance of major prey items is lower. Core areas of intense use were identified, and also varied seasonally. These core areas may be regarded as critical habitats and require special legislation and control. The mean daily group home-range did not differ statistically among seasons. The present study corroborates a spatially strict residency pattern of the estuarine dolphin in highly productive coastal ecosystems.

scholarly journals Space use and movement of jaguar (Panthera onca) in western Paraguay

2017 ◽  
Author(s):  
Roy T McBride ◽  
Jeffrey J Thompson
Keyword(s):  
Home Range ◽  
Hydrological Cycle ◽  
Home Range Size ◽  
Density Estimator ◽  
Home Ranges ◽  
Panthera Onca ◽  
Core Areas ◽  
Utility Distribution ◽  
Brazilian Pantanal

AbstractWe estimated home range and core area size for jaguar (Panthera onca) in western Paraguay in the Dry Chaco, Humid Chaco and Pantanal using an autocorrelated kernel density estimator. Mean home range size was 818 km2 (95% CI:425-1981) in the Dry Chaco and 237 km2 (95% CI:90-427) in the Humid Chaco/Pantanal. Core areas, defined as the home range area where use was equal to expected use, was consistent across sexes and systems represented on average by the 59% utility distribution isopleth (range:56-64%). Males had a higher probability of larger home ranges and more directional and greater daily movements than females collectively and within systems. The large home ranges in the Dry Chaco are attributable to the relatively low productivity of that semi-arid ecosystem and high heterogeneity in resource distribution while larger than expected home ranges in the Humid Chaco/Pantanal compared to home range estimates from the Brazilian Pantanal may be due to differences in geomorphology and hydrological cycle. The large home ranges of jaguars in western Paraguay and a low proportional area of protected areas in the region demonstrate the importance of private ranchland for the long-term conservation of the species.

Home ranges of sympatric red-necked wallabies, red-bellied pademelons and common brushtail possums in a temperate eucalypt forestry environment.

2003 ◽  
Vol 25 (2) ◽  
pp. 183 ◽  
Author(s):  
Mar K le ◽  
C McArthur ◽  
M Statham
Keyword(s):  
Home Range ◽  
Convex Polygon ◽  
Sexual Difference ◽  
Home Range Size ◽  
Home Ranges ◽  
Sexually Dimorphic ◽  
Minimum Convex Polygon ◽  
North West ◽  
Fixed Kernel ◽  
Core Areas

We investigated home ranges of sympatric red-necked (or Bennett?s) wallabies Macropus rufogriseus rufogriseus, red-bellied pademelons Thylogale billardierii and common brushtail possums Trichosurus vulpecula fuliginosus within a forestry environment in north-west Tasmania. Six indiviuals of each species were radio-tracked between 7 and 11 months. Nocturnal and diurnal data were used to estimate Minimum Convex Polygon (MCP) home range, 95% fixed-Kernel (KE) home range and 50% KE core area. Home ranges (mean � s.e.) were as follows: M. r. rufogriseus MCP = 61 � 12 ha, KE = 41 � 3 ha; T. billardierii MCP = 22 � 5 ha, KE = 16 � 3 ha; and Tr. v. fuliginosus MCP = 39 � 8 ha, KE = 17 � 3 ha. M. r. rufogriseus had larger MCP home ranges than T. billardierii (P < 0.05), and larger KE home ranges and core areas than both T. billardierii and Tr. v. fuliginosus (P < 0.05), which reflected their larger body mass. Inter-sexual comparisons within the sexually dimorphic macropods showed that M. r. rufogriseus males had significantly larger MCP and KE home ranges and core areas than females (P < 0.05), and T. billardierii males tended to have a larger KE home ranges than females (P = 0.08). No inter-sexual difference in home range size was detected for Tr. v. fuliginosus.

The influence of snow cover on home range and activity of the bush-rat (Rattus fuscipes) and the dusky antechinus (Antechinus swainsonii)

2006 ◽  
Vol 33 (6) ◽  
pp. 489 ◽  
Author(s):  
Glenn M. Sanecki ◽  
Ken Green ◽  
Helen Wood ◽  
David Lindenmayer ◽  
Karen L. Sanecki
Keyword(s):  
Home Range ◽  
Kernel Method ◽  
Radio Telemetry ◽  
Activity Patterns ◽  
Early Morning ◽  
Home Ranges ◽  
Minimum Convex Polygon ◽  
Drainage Line ◽  
Rattus Fuscipes ◽  
Autumn And Winter

Radio-telemetry was used to investigate changes in home-range sizes and activity patterns of Rattus fuscipes and Antechinus swainsonii in a subalpine heathland at Perisher Creek, Kosciuszko National Park, southern New South Wales, in response to the accumulation of snow during the winter. We estimated home-range area for each animal during the autumn and winter using two methods, minimum convex polygon and 95% and 50% utilisation contours using the kernel method. With both methods, the home ranges of R. fuscipes and A. swainsonii were significantly smaller (P < 0.001) during the winter than in the autumn. In winter, both species were restricted to areas of dense wet heath close to the main drainage line. R. fuscipes showed signs of social interaction during both seasons, as indicated by location fixes and gnawing damage to radio-collars, in contrast to A. swainsonii, which appeared to remain solitary. In winter, R. fuscipes apparently nested at a single location, whereas during autumn it appeared to use several nest sites. There was no significant change in daily activity patterns between autumn and winter in either species. R. fuscipes remained primarily nocturnal during both prenival and nival periods whereas A. swainsonii continued to be active throughout the diel cycle, although there was a slight shift in its peak activity time from around sunset in autumn to early morning in winter.

scholarly journals Does Plan B work? Home range estimations from stored on board and transmitted data sets produced by GPS-telemetry in the Colombian amazon

2016 ◽  
Vol 64 (4) ◽  
Author(s):  
Jaime Andres Cabrera ◽  
Eduardo Molina ◽  
Tania Gonzalez ◽  
Dolors Armenteras
Keyword(s):  
Home Range ◽  
Density Estimator ◽  
Home Ranges ◽  
Data Sets ◽  
Gps Telemetry ◽  
Minimum Convex Polygon ◽  
Positioning Systems ◽  
Brownian Bridges ◽  
Tapirus Terrestris ◽  
Colombian Amazon

Telemetry based on Global Positioning Systems (GPS) makes possible to gather large quantities of information in a very fine scale and work with species that were impossible to study in the past. When working with GPS telemetry, the option of storing data on board could be more desirable than the sole satellite transmitted data, due to the increase in the amount of locations available for analysis. Nonetheless, the uncertainty in the retrieving of the collar unit makes satellite-transmitted technologies something to take into account. Therefore, differences between store-on-board (SoB) and satellite-transmitted (IT) data sets need to be considered. Differences between SoB and IT data collected from two lowland tapirs (Tapirus terrestris), were explored by means of the calculation of home range areas by three different methods: the Minimum Convex Polygon (MCP), the Fixed Kernel Density Estimator (KDE) and the Brownian Bridges (BB). SoB and IT data sets were similar, with fix ranging from 63% to 85% respectively and 16 m to 17 m horizontal errors. Depending on the total number of locations available for each individual, the home ranges estimated showed differences between 2.7% and 79.3%, for the 50% probability contour and between 9.9% and 61.8% for the 95% probability contour. These differences imply variations in the spatial coincidence of the estimated home ranges. We conclude that the use of IT data is not a good option for the estimation of home range areas if the collar settings have not been designed specifically for this use. Nonetheless, geographical representations of the IT based estimators could be of great help to identify areas of use, besides its assistance to locate the collar for its retrieval at the end of the field season and as a proximate backup when collars disappear.

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