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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/43843

Title: Multifractal anisotropic swimming: the optimal foraging behaviour of grouper larvae
Authors: Mahjoub, M. S.;G. Dur;S. Souissi;F.G. Schmitt;J.S. Hwang
Contributors: 國立臺灣海洋大學:海洋生物研究所
Keywords: feeding;fish larva;multifractality;plankton
Date: 2016-03
Issue Date: 2017-11-02T07:16:53Z
Publisher: Journal of Fish Biology
Abstract: Abstract
It was hypothesized that the Malabar grouper Ephinephelus malabaricus larvae have developed search patterns adapted to the distribution of their prey to maximise their net energy intake per unit time. Analysis of the swimming behaviour of E. malabaricus larvae in both the presence and absence of Artemia sp. nauplii is presented to test this hypothesis. A method derived from turbulence studies (the moment function of the displacements) was used to characterize the behaviour. The results revealed that larval swimming pattern was multifractal (intermittent and long-range-correlated) and isotropic (i.e. uniform in all directions) in the presence of prey, but multifractal and anisotropic (i.e. more frequent long displacement on the vertical axis) in the absence of prey. It is suggested that the search behaviour observed in the absence of prey is an adaptive response to prey distribution pattern, which is often characterised by multifractality and anisotropy (i.e. larger patches on the horizontal axes). In the presence of prey, E. malabaricus shifted to intensive search behaviour. Other possible contributors to the observed patterns are discussed. It is concluded that multifractality and anisotropy of swimming patterns observed in the experiment are mainly explained in an optimal foraging theory framework.
Relation: 88(5), pp.1835-1846
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/43843
Appears in Collections:[海洋生物研究所] 期刊論文

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