Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/9401
Full metadata record
DC FieldValueLanguage
dc.contributor.authorZhang, Xen
dc.contributor.authorJohnson, S Nen
dc.contributor.authorCrawford, J Wen
dc.contributor.authorGregory, P Jen
dc.contributor.authorYoung, Iainen
dc.date.accessioned2012-02-06T18:09:00Z
dc.date.issued2007en
dc.identifier.citationEcological Modelling, 200(1-2), p. 79-88en
dc.identifier.issn1872-7026en
dc.identifier.issn0304-3800en
dc.identifier.urihttps://hdl.handle.net/1959.11/9401en
dc.description.abstractThe movement of organisms is usually leptokurtic in which some individuals move long distances while the majority remains at or near the area they are released. There has been extensive research into the origin of such leptokurtic movement, but one important aspect that has been overlooked is that the foraging behaviour of most organisms is not Brownian as assumed in most existing models. In this paper we show that such non-Brownian foraging indeed gives rise to leptokurtic distribution. We first present a general random walk model to describe the organism movement by breaking the foraging of each individual into events of active movement and inactive stationary period; its foraging behaviour is therefore fully characterized by a joint probability of how far the individual can move in each active movement and the duration it remains stationary between two consecutive movements. The spatio-temporal distribution of the organism can be described by a generalized partial differential equation, and the leptokurtic distribution is a special case when the stationary period is not exponentially distributed. Empirical observations of some organisms living in different habitats indicated that their rest time shows a power-law distribution, and we speculate that this is general for other organisms. This leads to a fractional diffusion equation with three parameters to characterize the distributions of stationary period and movement distance. A method to estimate the parameters from empirical data is given, and we apply the model to simulate the movement of two organisms living in different habitats: a stream fish (Cyprinidae: 'Nocomis leptocephalus') in water, and a root-feeding weevil, 'Sitona lepidus' in the soil. Comparison of the simulations with the measured data shows close agreement. This has an important implication in ecology that the leptokurtic distribution observed at population level does not necessarily mean population heterogeneity as most existing models suggested, in which the population consists of different phenotypes; instead, a homogeneous population moving in homogeneous habitat can also lead to leptokurtic distribution.en
dc.languageenen
dc.publisherElsevier BVen
dc.relation.ispartofEcological Modellingen
dc.titleA general random walk model for the leptokurtic distribution of organism movement: Theory and applicationen
dc.typeJournal Articleen
dc.identifier.doi10.1016/j.ecolmodel.2006.07.016en
dc.subject.keywordsTerrestrial Ecologyen
dc.subject.keywordsSoil Biologyen
dc.subject.keywordsSoil Physicsen
dc.subject.keywordsSoil Sciencesen
local.contributor.firstnameXen
local.contributor.firstnameS Nen
local.contributor.firstnameJ Wen
local.contributor.firstnameP Jen
local.contributor.firstnameIainen
local.subject.for2008060208 Terrestrial Ecologyen
local.subject.for2008050303 Soil Biologyen
local.subject.for2008050305 Soil Physicsen
local.subject.for2008050399 Soil Sciences not elsewhere classifieden
local.subject.seo2008961402 Farmland, Arable Cropland and Permanent Cropland Soilsen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.emailiyoung4@une.edu.auen
local.output.categoryC1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordune-20100219-123636en
local.publisher.placeAmsterdam, The Netherlandsen
local.format.startpage79en
local.format.endpage88en
local.peerreviewedYesen
local.identifier.volume200en
local.identifier.issue1-2en
local.title.subtitleTheory and applicationen
local.contributor.lastnameZhangen
local.contributor.lastnameJohnsonen
local.contributor.lastnameCrawforden
local.contributor.lastnameGregoryen
local.contributor.lastnameYoungen
dc.identifier.staffune-id:iyoung4en
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:9592en
dc.identifier.academiclevelAcademicen
local.title.maintitleA general random walk model for the leptokurtic distribution of organism movementen
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.description.statisticsepubsVisitors: 603<br />Views: 603<br />Downloads: 0en
local.search.authorZhang, Xen
local.search.authorJohnson, S Nen
local.search.authorCrawford, J Wen
local.search.authorGregory, P Jen
local.search.authorYoung, Iainen
Appears in Collections:Journal Article
Files in This Item:
2 files
File Description SizeFormat 
Show simple item record

SCOPUSTM   
Citations

26
checked on Nov 30, 2018

Page view(s)

52
checked on Feb 8, 2019
Google Media

Google ScholarTM

Check

Altmetric


Items in Research UNE are protected by copyright, with all rights reserved, unless otherwise indicated.