Fractal analysis reveals pernicious stress levels related to boat presence and type in the Indo–Pacific bottlenose dolphin, Tursiops aduncus

Seuront, Laurent; Cribb, Nardi

doi:10.1016/j.physa.2011.02.015

Cited by 29 publications

(55 citation statements)

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“…Indeed, it seems that the production of complex behavioural se quences is dependent upon having adequate levels of available energy (e.g. Kembro et al 2009, Seuront & Cribb 2011. Under conditions of energy constraint, such as those likely produced by our experimental paradigm, sequences of behaviour may become more structured and periodic, further indicating an intrinsic component in the production of Lévy-like behaviour.…”

Section: Corticosterone and Diving Behaviourmentioning

confidence: 87%

“…Theoretically, αDFA is inversely related to the fractal dimension, and thus smaller values reflect greater complexity. In addition to identifying the scaling behaviour of self-affine sequences, DFA can also distinguish the class of signal being examined: α ε (0, 1) indicates fractional Gaussian noise (fGn) while α ε (1, 2) indicates fractional Brownian motion (fBm), which is critical for the accurate interpretation of observed scaling exponents (Delignieres et al 2005, Seuront 2010). We performed DFA using the package 'fractal' (Constantine & Percival 2011) in R statistical software 2.11.1 (R Development Core Team 2008).…”

Section: Diving Data Analysismentioning

confidence: 99%

“…complexity loss) but only in the first foraging trips following implantation. Complexity loss in animal behaviour has been demonstrated in individuals under various challenging conditions such as health impairment (MacIntosh et al 2011), parasitic infection (Alados et al 1996, MacIntosh et al 2011, advanced reproductive state (Alados et al 1996, MacIntosh et al 2011, toxic substance exposure (Motohashi et al 1993, Alados & Weber 1999, Seuront & Leterme 2007, feed restriction (Maria et al 2004), aggressive social interactions (Rutherford et al 2006) and increased exposure to anthropogenic disturbance (Seuront & Cribb 2011). What our study adds to this increasing body of work is an investigation of the effects of a direct increase in a physiological indicator of stress: the glucocorticoid corticosterone, which is the main stress hormone in birds.…”

Section: Corticosterone and Diving Behaviourmentioning

confidence: 99%

“…Under this framework, the application of fractal tools has shown that alterations occur in the complexity (here the correlation structure in time series rather than spatial data) of a diverse array of biological systems when operating under pathological conditions. For example, complexity loss is associated with various forms of physiological impairment in heart rhythms , stride patterns (Hausdorff et al 1995), and even animal behaviour (Alados et al 1996, Rutherford et al 2004, MacIntosh et al 2011, Seuront & Cribb 2011. Complexity loss may thus pose a long-term performance constraint with potential fitness costs if individuals can no longer cope with heterogeneity in their natural environments or achieve theoretically optimal foraging patterns.…”

Section: Introductionmentioning

confidence: 99%

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Corticosterone administration leads to a transient alteration of foraging behaviour and complexity in a diving seabird

Cottin¹,

MacIntosh²,

Kato³

et al. 2014

Mar. Ecol. Prog. Ser.

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Hormones link environmental stimuli to the behavioural and/or physiological responses of organisms. The release of corticosterone has major effects on both energy mobilization and its allocation among the various requirements of an individual, especially regarding survival and reproduction. We therefore examined the effects of experimentally elevated baseline corticosterone levels on the foraging behaviour of Adélie penguins Pygoscelis adeliae during chickrearing. We monitored the at-sea behaviour of corticosterone-implanted and control male birds using time-depth recorders, and monitored the effects of corticosterone treatment on their body conditions as well as their chicks' body masses and survival. Bio-logged data were examined via traditional measures of diving behaviour as well as fractal analysis as an index of behavioural complexity. Corticosterone administration caused a transient decrease in both overall foraging effort (i.e. reductions in the duration of at-sea trips, the time spent diving and the number of dives performed) and foraging complexity. In contrast, per-dive performance indices suggested an increase in both efficiency and prey pursuit rates. Ultimately, however, we observed no short-term effects of treatment on adult body condition and chick body mass and survival. We conclude that under higher corticosterone levels, sequences of behaviour may become more structured and periodic, as observed in treated birds. The increased energy allocation to dive-scale behaviours observed in treated birds might then reflect an adjustment to intrinsic constraints allowing reductions in energy expenditure at the trip-scale. This study highlights the utility of using both traditional and fractal analyses to better understand scale-dependent responses of animals to energetic and various other environmental challenges.

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Section: Corticosterone and Diving Behaviourmentioning

confidence: 87%

Section: Diving Data Analysismentioning

confidence: 99%

Section: Corticosterone and Diving Behaviourmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Corticosterone administration leads to a transient alteration of foraging behaviour and complexity in a diving seabird

Cottin¹,

MacIntosh²,

Kato³

et al. 2014

Mar. Ecol. Prog. Ser.

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show abstract

“…The exponent  is estimated as the slope of N(l L)  vs. l in log-log plots, and has been shown to decrease under stressful conditions for both vertebrates (Alados et al, 1996;Seuront & Cribb, 2011) and invertebrates (Seuront & Leterme, 2007;Seuront, 2011b). It is stressed, however, that Eq.…”

Section: Complexity Of Instantaneous Successive Displacementsmentioning

confidence: 99%

Hydrocarbon Contamination and the Swimming Behavior of the Estuarine Copepod Eurytemora affinis

Seuront¹

2012

Marine Ecosystems

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Modeling activity patterns of wildlife using time‐series analysis

Zhang

Hull

Ouyang

et al. 2017

Ecology and Evolution

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The study of wildlife activity patterns is an effective approach to understanding fundamental ecological and evolutionary processes. However, traditional statistical approaches used to conduct quantitative analysis have thus far had limited success in revealing underlying mechanisms driving activity patterns. Here, we combine wavelet analysis, a type of frequency‐based time‐series analysis, with high‐resolution activity data from accelerometers embedded in GPS collars to explore the effects of internal states (e.g., pregnancy) and external factors (e.g., seasonal dynamics of resources and weather) on activity patterns of the endangered giant panda (Ailuropoda melanoleuca). Giant pandas exhibited higher frequency cycles during the winter when resources (e.g., water and forage) were relatively poor, as well as during spring, which includes the giant panda's mating season. During the summer and autumn when resources were abundant, pandas exhibited a regular activity pattern with activity peaks every 24 hr. A pregnant individual showed distinct differences in her activity pattern from other giant pandas for several months following parturition. These results indicate that animals adjust activity cycles to adapt to seasonal variation of the resources and unique physiological periods. Wavelet coherency analysis also verified the synchronization of giant panda activity level with air temperature and solar radiation at the 24‐hr band. Our study also shows that wavelet analysis is an effective tool for analyzing high‐resolution activity pattern data and its relationship to internal and external states, an approach that has the potential to inform wildlife conservation and management across species.

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Fractal analysis reveals pernicious stress levels related to boat presence and type in the Indo–Pacific bottlenose dolphin, Tursiops aduncus

Cited by 29 publications

References 50 publications

Corticosterone administration leads to a transient alteration of foraging behaviour and complexity in a diving seabird

Corticosterone administration leads to a transient alteration of foraging behaviour and complexity in a diving seabird

Hydrocarbon Contamination and the Swimming Behavior of the Estuarine Copepod Eurytemora affinis

Modeling activity patterns of wildlife using time‐series analysis

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