Searching strategy of the painted turtle Chrysemys picta across spatial scales

Bowne, David R.; White, Heather R.

doi:10.1016/j.anbehav.2004.01.018

Cited by 40 publications

(25 citation statements)

References 35 publications

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“…In contrast, turning angles in the matrix were constrained to a greater degree, rendering movement paths more linear and increasing net displacement. This is a recognized strategy of organisms that suffer high mortality while searching for resources they cannot detect at distance (Zollner and Lima 1999) and is known from other beetles (Wiens et al 1997), other insects (Kindvall 1999;Schooley and Wiens 2003) and also vertebrates (Nolet and Mooij 2002;Bowne and White 2004;Morales et al 2004;Phillips et al 2004). Movement frequencies over the entire hour of observation were higher in the matrix than the patch, but this difference disappeared during the final 30 min.…”

Section: Discussionmentioning

confidence: 95%

Landscape and fine-scale movements of a leaf beetle: the importance of boundary behaviour

2007

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Movement underpins animal spatial ecology and is often modelled as habitat-dependent correlated random walks. Here, we develop such a model for the flightless tansy leaf beetle Chrysolina graminis moving within and between patches of its host plant tansy Tanacetum vulgare. To parameterize the model, beetle movement paths on timescales of minutes were observed in uniform plots of tansy and inter-patch matrix (meadow) vegetation. Movement lasted longer, covered greater distances and had narrower turning angles in the matrix. Simulations of the model emulated an independent two-season multi-patch mark-resight study at daily timescales and included variable boundary-mediated behaviour affecting the probability of leaving habitat patches. As boundaries in the model became stronger there were disproportionately large decreases in net displacements, inter-patch movements and the proportion of beetles in the matrix. The model produced realistic patterns of population-level displacement over periods up to 13 days with fully permeable boundaries for one dataset and strong boundaries for the other. This may be explained by the heights of the tansy patches in each study, as beetles will be unable to cross the boundary near the top of a patch that emerges from the matrix. The simulations demonstrate the important effects of boundary behaviour on displacement patterns and indicate temporal and spatial variability in permeability. Realistic models of movement must therefore include behaviour at habitat boundaries.

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Section: Discussionmentioning

confidence: 95%

Landscape and fine-scale movements of a leaf beetle: the importance of boundary behaviour

2007

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“…[22,[31][32][33][34][35]), particularly in reference to movements, orientation and navigation (e.g. [23,29,34,[36][37][38][39]), learning (e.g. [22,31,35]), and spatial memory (e.g.…”

Section: Materials and Methods (A) Model Speciesmentioning

confidence: 99%

Pharmacological evidence is consistent with a prominent role of spatial memory in complex navigation

Roth

Krochmal

2016

Proc. R. Soc. B.

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The ability to learn about the spatial environment plays an important role in navigation, migration, dispersal, and foraging. However, our understanding of both the role of cognition in the development of navigation strategies and the mechanisms underlying these strategies is limited. We tested the hypothesis that complex navigation is facilitated by spatial memory in a population of Chrysemys picta that navigate with extreme precision (+3.5 m) using specific routes that must be learned prior to age three. We used scopolamine, a muscarinic acetylcholine receptor antagonist, to manipulate the cognitive spatial abilities of free-living turtles during naturally occurring overland movements. Experienced adults treated with scopolamine diverted markedly from their precise navigation routes. Naive juveniles lacking experience (and memory) were not affected by scopolamine, and thereby served as controls for perceptual or non-spatial cognitive processes associated with navigation. Further, neither adult nor juvenile movement was affected by methylscopolamine, a form of scopolamine that does not cross the blood-brain barrier, a control for the peripheral effects of scopolamine. Together, these results are consistent with a role of spatial cognition in complex navigation and highlight a cellular mechanism that might underlie spatial cognition. Overall, our findings expand our understanding of the development of complex cognitive abilities of vertebrates and the neurological mechanisms of navigation.

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“…This can be misleading in the understanding of ecosystems' functioning and that is probably partly why some controversies emerged about how to use and interpret fractal dimension estimates (e.g. Turchin 1996;Benhamou 2004;Bowne and White 2004;Halley et al 2004). The primary objective of the present paper is then to clarify the dual aspect of fractals and to show that those two properties may be quantified by a single dimension (D HB ) only in some specific cases.…”

Section: Introductionmentioning

confidence: 95%

The duality of fractals: roughness and self-similarity

Bez

Bertrand

2010

Theor Ecol

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The fractal dimension (D HB ) is an interesting metrics because it is supposed to quantify by a single value, scale independence and roughness of ecological objects. However, we show here that those two properties may be quantified by a single dimension only in some specific cases. In general, a non-integer D HB quantifies only the roughness, and self-similarity needs to be evidenced or postulated by other means. Second, we revisit some aspects of the practical estimation of D HB . We recommend the use of madogram instead of variogram for estimations based on geostatistics. We propose a simplification of its estimation for 2D fields and discuss its possible relationship with self-similarity. We finally underline the problem of scale and resolution. Field data recorded during a scientific acoustic survey on the North Sea herring are used for illustrations. The paper concludes on a synthesis of practical recommendations to ecologists when using fractal dimension.

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Searching strategy of the painted turtle Chrysemys picta across spatial scales

Cited by 40 publications

References 35 publications

Landscape and fine-scale movements of a leaf beetle: the importance of boundary behaviour

Landscape and fine-scale movements of a leaf beetle: the importance of boundary behaviour

Pharmacological evidence is consistent with a prominent role of spatial memory in complex navigation

The duality of fractals: roughness and self-similarity

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