# Fractal landscape method: an alternative approach to measuring area-restricted searching behavior

Article

*The Journal of Experimental Biology.*210 (6), pp. 935-945. https://doi.org/10.1242/jeb.02710

Article Title | Fractal landscape method: an alternative approach to measuring area-restricted searching behavior |
---|---|

ERA Journal ID | 2090 |

Article Category | Article |

Authors | Tremblay, Yann (Author), Roberts, Antony J. (Author) and Costa, Daniel P. (Author) |

Journal Title | The Journal of Experimental Biology |

Journal Citation | 210 (6), pp. 935-945 |

Number of Pages | 11 |

Year | 2007 |

Place of Publication | United Kingdom |

ISSN | 0022-0949 |

1477-9145 | |

Digital Object Identifier (DOI) | https://doi.org/10.1242/jeb.02710 |

Web Address (URL) | https://journals.biologists.com/jeb/article/210/6/935/17319/Fractal-landscape-method-an-alternative-approach |

Abstract | Quantifying spatial and temporal patterns of prey searching is of primary importance for understanding animals' critical habitat and foraging specialization. In patchy environments, animals forage by exhibiting movement patterns consisting of area-restricted searching (ARS) at various scales. Here, we present a new method, the fractal landscape method, which describes the peaks and valleys of fractal dimension along the animal path. We describe and test the method on simulated tracks, and quantify the effect of track inaccuracies. We show that the ARS zones correspond to the peaks from this fractal landscape and that the method is near error-free when analyzing high-resolution tracks, such as those obtained using the Global Positioning System (GPS). When we used tracks of lower resolution, such as those obtained with the Argos system, 9.6–16.3% of ARS were not identified, and 1–25% of the ARS were found erroneously. The later type of error can be partially flagged and corrected. In addition, track inaccuracies erroneously increased the measured ARS size by a factor of 1.2 to 2.2. Regardless, the majority of the times and locations were correctly flagged as being in or out of ARS (from 83.8 to 89.5% depending on track quality). The method provides a significant new tool for studies of animals' foraging behavior and habitat selection, because it provides a method to precisely quantify each ARS separately, which is not possible with existing methods. |

Keywords | fractal dimension; fractal landscape; elephant seal; albatross; foraging; prey-searching strategy; tracking; Argos; top predator; area-restricted search |

ANZSRC Field of Research 2020 | 310301. Behavioural ecology |

490102. Biological mathematics | |

490199. Applied mathematics not elsewhere classified | |

Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |

Byline Affiliations | University of California, United States |

Department of Mathematics and Computing |

https://research.usq.edu.au/item/9zv58/fractal-landscape-method-an-alternative-approach-to-measuring-area-restricted-searching-behavior

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