Fractal structure of sequential behaviour patterns: an indicator of stress

  title={Fractal structure of sequential behaviour patterns: an indicator of stress},
  author={C. Alados and J. Esc{\'o}s and J. Emlen},
  journal={Animal Behaviour},
The detection of stress arising from parasitic infection bySarcoptes scabieisand from pregnancy is explored, using a fractal analysis of head lifting behaviour and feeding–non-feeding activity sequences in female Spanish ibex,Capra pyrenaica, under natural conditions. Because organisms under stress increase their metabolic rate and, in consequence, energy consumption, it follows that stress will, generally, lead to a reduction in complexity (fractal dimension) of exploratory behaviour. In the… Expand
Investigating fractal analysis of animal behaviour as an indicator of stress
Currently, measures of on-going behaviour used in welfare assessment are commonly limited to durations and frequencies; however, these provide only a partial description of behaviour. ExtractingExpand
Fractal measures in activity patterns: Do gastrointestinal parasites affect the complexity of sheep behaviour?
Investigating fractal patterns in the behavioural activity of domestic sheep in relation to strongylid infection indicated that sheep treated with anthelmintics exhibited a higher complexity in their activity sequences than parasitized sheep, suggesting that organizational patterns of their behaviour change with gastrointestinal parasite infection. Expand
Detrended fluctuation analysis of behavioural responses to mild acute stressors in domestic hens
Fractal analysis provides a novel measure of behavioural complexity and has previously revealed subtle alterations in behaviour under biologically costly conditions, such as parasitism or disease.Expand
When Complexity Rimes with Sanity: Loss of Fractal and Multifractal Behavioural Complexity as an Indicator of Sublethal Contaminations in Zooplankton
It is described how the complexity observed in the spatial and temporal patterns of copepod swimming behaviour can be objectively quantified using a series of ‘behavioural stress indexes’ based on fractal and multifractal analyses ofCopepod swimmers behaviour and swimming sequences. Expand
Computational Analysis Of Movement BehaviorsOf Medaka (Oryzias Latipes) After The TreatmentsOf Copper By Using Fractal Dimension AndArtificial Neural Networks
Response behaviors of medaka were computationally analyzed before and after the treatments of copper at low concentration (1.0 mg/L). Parameters (e.g., speed, stop time, turning rate, etc) of theExpand
Fractal analysis of behaviour in a wild primate: behavioural complexity in health and disease
It is argued that a reduction in complexity in animal behaviour characterizes individuals in impaired or ‘stressed’ states, and may have consequences if animals cannot cope with heterogeneity in their natural habitats. Expand
Complexity of behavioural sequences and their relation to stress conditions in chickens (Gallus gallus domesticus): a non-invasive technique to evaluate animal welfare
Abstract A complexity analysis was performed on the behaviour time series of four groups of seven chickens ( Gallus gallus domesticus ) using the detrended fluctuation analysis (DFA). DFA quantifiesExpand
The impact of grazing on plant fractal architecture and fitness of a Mediterranean shrub Anthyllis cytisoides L.
The favourable effect of moderate levels of herbivory on A. cytisoides is reflected in the homeostatic maintenance of its translatory symmetry and in the increased complexity of its fractal structures. Expand
Variation in Fractal Symmetry of Annual Growth in Aspen as an Indicator of Developmental Stability in Trees
The utilization and meaning of fractal analysis on annual growth ring production in woody plants is explored, and it is argued that the reduced fractal dimension is related to a loss in system complexity of stressed individuals. Expand
Stress resistance strategy in an arid land shrub: interactions between developmental instability and fractal dimension
The results show that A. cytisoides maintains developmental stability at the expense of productivity, and Anthyllis cytisoide was developmentally more stable when grazed and when on south-facing, as opposed to north-facing slopes. Expand


Applications of fractal analysis to physiology.
Although the methods used for fractal analyses of physiological data are still under development and will require additional validation, they appear to have great potential for the study of physiology at scales of resolution ranging from the microcirculation to the intact organism. Expand
Applications of Fractal Theory to Ecology
Forms with fractal geometric properties are found in ecosystems. Fractal geometry seems to be a basic space occupation property of biological systems. The surface area of the contact zones betweenExpand
Using asymmetry analysis on three species of marine teleost-barred sand bass, Paralabrax Ilebulifer; grunion, Leureslhes lenuis; and barred surfperch, AlIlphistichus argellteus-from southern California and B<\ia California, the possible use of fluctuating asymmetry as a possible measure of environmental stress is examined. Expand
Zooplankton body size and community structure: Effects of thermal and toxicant stress.
  • M. Moore, C. Folt
  • Environmental Science, Medicine
  • Trends in ecology & evolution
  • 1993
During the past decade, it has become widely accepted that a shift in zooplankton body size can dramatically affect water clarity, rates of nutrient regeneration and fish abundances. Expand
Fractals: A User's Guide for the Natural Sciences
This paper presents a meta-analyses of the behaviour of density-dependent populations under random noise and the role of Fourier transform in this behaviour. Expand
Quantitation of the renal arterial tree by fractal analysis
Since the renal arterial tree has a fractal structure, Euclidean geometric measurements, such as area and boundary length, are invalid outside precisely defined conditions of magnification and resolution. Expand
Fractal Analysis of Pulmonary Arteries: The Fractal Dimension Is Lower in Pulmonary Hypertension
We analyzed the spatial structure of contact radiographs of barium-filled pulmonary arteries of rats raised in room air and in two environments that induce pulmonary arterial hypertensionExpand
Fluctuating asymmetry and fractal dimension of the sagittal suture as indicators of inbreeding depression in dama and dorcas gazelles
The sum of the foramina in 5 of the skull regions clearly indicates an increase in asymmetry with inbreeding in both dorcas and dama gazelles, which is in concordance with the more evident deleterious effects of inbreeding depression in dama. Expand
Heart rate variability and fractal dimension during orthostatic challenges.
Heart rate variability (HRV) spectral analysis has been used as a tool for short-term assessment of parasympathetic (PNS) and sympathetic nervous system (SNS) control of heart rate. However, it hasExpand
Fractal physiology
The nature of fractals and the use of fractals instead of classical scaling concepts to describe the irregular surfaces, structures, and processes exhibited by physiological systems are described.Expand