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Etzenhouser, Matthew J.; Owens, M. K.; Spalinger, Donald E.; Murden, Steven B.

doi:10.1023/a:1007947405749

Cited by 87 publications

(7 citation statements)

References 23 publications

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“…We used fractal analysis to describe a path's tortuousity (With 1994;Etzenhouser et al 1998) and related tortuousity to behaviours expressed along the path. Fractal geometry was developed as a tool to quantify objects of irregular form (Mandelbrot 1967;Milne 1991), and the fractal dimension (D) for lines lies between 1, when the line is straight, and a maximum of 2, when a line is so tortuous as to completely cover a plane.…”

Section: Introductionmentioning

confidence: 99%

“…Patches of grasses and low-level browse may appear to the observer to be continuous, but may actually have subtle variations in productivity (Arditi and Dacorogna 1988;Bell 1990). Because an animal's perception of its environment can be deduced from its movement patterns (Etzenhouser et al 1998;Ball et al 2000), fractal analysis of the paths should be able to identify the limits of profitable foraging.…”

Section: Introductionmentioning

confidence: 99%

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Assessing microhabitat use by roe deer and moose in China

Jiang

Zhang

et al. 2009

Wildl. Res.

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Potential conflicts between forestry production practices and wildlife habitat requirements are increasing globally with rapid socioeconomic development. Moose (Alces alces cameloides) and roe deer (Capreolus pygargus bedfordi) populations are in decline in north-eastern China, an area managed for forestry production. We obtained detailed information about these species' use of habitat by following their movement paths in snow and recording behaviours exhibited along their paths. We used fractal analysis, Mann-Whitney U-tests and linear mixed models to analyse the paths and the relationships between tortuousity, habitat, and the expressed behaviours at different spatial scales. This analysis showed a natural break in the fractal dimension of moose movement paths at a scale of~10 m, suggesting that moose exhibited different responses to their microhabitat and behavioural requirements at scales above and below this threshold. However, we detected no differences in the responses of roe deer over a scale range of 3-20 m. Moose paths tended to pass through areas with higher basal areas of tree stems and those with deeper snow. Roe deer showed positive associations between tortuousity and the number of bedding sites and feeding sites, and a negative association between tortuousity and the total basal area of tree stems. There was a positive relationship between the numbers of bedding and defaecating sites, and a negative association between the number of bedding sites and snow depth. For moose, we found positive associations between tortuousity and the number of defaecating sites, the basal areas of both broadleaf stands and mixed conifer and broadleaf stands, and a negative association between tortuousity and the number of feeding sites. We concluded that roe deer foraged in accordance with patch-use theory, whereas moose foraged in accordance with diet-selection theory. We concluded that modifications to forestry practices to foster the populations of both species of deer will require forestry operations to be conducted on a much finer scale, and that one species can be promoted over the other by selective fine-scale habitat management.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Assessing microhabitat use by roe deer and moose in China

Jiang

Zhang

et al. 2009

Wildl. Res.

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“…The first reason may be related to the distribution patterns of resources required by animals across the landscape and the different ways in which animals access them. In habitat areas with dispersed resources, these animals will rely on a highly tortuous path to improve foraging efficiency (Etzenhouser et al, 1998). Conversely, tigers need to capture large prey and they are directional when moving through the landscape (Sunquist, 1981).…”

Section: Discussionmentioning

confidence: 99%

The fine‐scale movement pattern of Amur tiger (Panthera tigris altaica) responds to winter habitat permeability

Wang,

Cheng,

Guan

et al. 2023

Wildlife Letters

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The number of Amur tigers living in protected regions is increasing, and China has achieved significant progress in this regard, especially at the Sino‐Russia border region around Hunchun where most of the Amur tigers are found in China. However, there is a need to increase the dispersal of Amur tigers further from the border as the region is not large enough to support the sustainable survival of the population. In the winter of 2012–2015 and January 2022, we tracked 38 Amur tiger snow traces and performed line transect and camera trap surveys in Hunchun to assess Amur tiger movements in response to the landscape and its permeability at fine scales. Our results showed that towns, shrubs, and forest roads are the main factors influencing Amur tiger movements. Furthermore, tiger paths were characterized by lower tortuosity in preferred habitats. This provides information for small‐scale habitat modification to increase landscape permeability and facilitate dispersal.

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“…climate or characteristics of the benthic habitat. At an inter-specific level, negative relationships between path tortuosity and body size have been observed in the field for a phylogenetically diverse set of species in both aquatic and terrestrial environments, from invertebrates to mammals (With 1994a;Etzenhouser et al 1998;With et al 1999;McDonald and St Clair 2004;Prevedello et al 2010). The average speed (expressed in mm s -1 ) of each individual was highly correlated with the mean step length (r = 0.97, P \ 0.0001, 46 df) and for the sake of conciseness it is not reported…”

Section: Discussionmentioning

confidence: 99%

Body size-related constraints on the movement behaviour of the arctic notostracan Lepidurus arcticus (Pallas, 1973) under laboratory conditions

Mancinelli

Pasquali

2016

Rend. Fis. Acc. Lincei

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The movement behaviour of individuals has long been acknowledged as a key determinant of species distribution in space and time. Information on benthic macroinvertebrates from aquatic habitats are still scant, however, and for polar species are virtually nonexistent. Here, the influence of body size on the movement behaviour of the arctic notostracan Lepidurus arcticus (Pallas) was examined under resource-free laboratory conditions. The mean step length, total path length and average speed were determined for specimens varying in body dry mass by six orders of magnitude. The scale-independent fractal dimension D was used to quantify movement path tortuosity. Among the different movement metrics considered, the body size of specimens scaled significantly only with path tortuosity; specifically, a negative relationship with a breakpoint was observed between individual body masses and the D values of the respective movement paths. The results are discussed considering similar results obtained for benthic crustaceans from temperate habitats. Additionally, their implications for future investigations explicitly considering temperature effects on movement behaviour are briefly considered. Keywords Arctic tadpole shrimp Á Locomotor activity Á Individual differences Á Fractal dimension This peer-reviewed article is a result of the multi and interdisciplinary research activities based at the Arctic Station ''Dirigibile Italia'', coordinated by the ''Dipartimento Scienze del Sistema Terra e Tecnologie per l'Ambiente'' of the National Council of Research of Italy.

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Cited by 87 publications

References 23 publications

Assessing microhabitat use by roe deer and moose in China

Assessing microhabitat use by roe deer and moose in China

The fine‐scale movement pattern of Amur tiger (Panthera tigris altaica) responds to winter habitat permeability

Body size-related constraints on the movement behaviour of the arctic notostracan Lepidurus arcticus (Pallas, 1973) under laboratory conditions

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