Introduction: The Heterogeneity of Heterogeneity: A Glossary

Kolasa, Jurek; Rollo, C. David

doi:10.1007/978-1-4612-3062-5_1

Cited by 214 publications

(224 citation statements)

References 24 publications

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“…Through our use of accurate DTMs we have achieved a measurement resolution sufficiently fine to distinguish broadly similar sub-sites as topographically and functionally different. This spatial grain was also appropriate for assessing topography at a resolution that individual seals use when making decisions (Forman & Gordon 1986, Kolasa & Rollo 1991, Turner et al 1989, Wiens 1989. Our topographic analyses suggested that the Tarbet site was a relatively higher "cost" site than that of WRB.…”

Section: Discussionmentioning

confidence: 87%

“…Powell & Mitchell 1998;Thomas 1993). However, the scale of topographic measurement must be close to the individual's perceptual scale (extent and resolution) in order to determine potential influences upon minute by minute behavioural decisions of individuals (Kolasa & Rollo 1991). This study achieves this resolution of topographic measurement and relates topography to individual behaviour in breeding female grey seals.…”

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confidence: 93%

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Finescale topographical correlates of behavioural investment in offspring by female grey seals, Halichoerus grypus

Twiss¹,

Caudron

Pomeroy

et al. 2000

Animal Behaviour

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(2000) 'Finescale topographical correlates of behavioural investment in o spring by female grey seals, Halichoerus grypus.', Animal behaviour., 59 (2). pp. 327-338. Further information on publisher's website:http://dx.doi.org/10.1006/anbe.1999.1320 Publisher's copyright statement: This is the author's version of a work that was accepted for publication in Animal Behaviour. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be re ected in this document. Changes may have been made to this work since it was submitted for publication. A de nitive version was subsequently published in Animal Behaviour, 2000Behaviour, , 59, 2, 327 338, doi: 10.1006Behaviour, /anbe.1999Behaviour, .1320 Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. ABSTRACTGrey seals breed colonially on substrates ranging from ice to rocky or sandy beaches. Clear differences in seal behaviour patterns exist among such broad classes of breeding habitat.However, finer scale topographic variation is likely to influence individual behaviour with consequences for pupping success. We examine topographic influences on breeding female grey seal behaviour by quantifying topography at a sub-seal size resolution. Using sub-metre resolution Digital Terrain Models of two sites within a rocky breeding colony we compare site topography in relation to observed differences in female behaviour at these sites. Females at both sites showed a preference for breeding close to water (standing pools or sea) and frequently commuted between their pups and water. Topographic models indicated that one site was more costly for seals in terms of their locations and movements within the site. This was due to a lack of low elevation land adjacent to the main access points from the sea and the reduced availability of pools. Females at this site showed reduced pup attendance and an increase in energetically costly behaviours, whilst females at the lower cost site spent more time interacting with their pups and resting. These topographically induced behavioural differences are likely to affect the quantity and quality of pup provisioning by mothers and influence individual pupping site selection. Less costly sites are likely to be colonised preferentially and by larger, older and more dominant females, potentially generating fine scale spatial heterogeneity in female quality within the breeding colony.Whilst it may be obvious that topography is likely to...

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Section: Discussionmentioning

confidence: 87%

mentioning

confidence: 93%

Finescale topographical correlates of behavioural investment in offspring by female grey seals, Halichoerus grypus

Twiss¹,

Caudron

Pomeroy

et al. 2000

Animal Behaviour

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“…Otherwise, the output from spatial pattern statistics will be difficult to interpret. The recognition of meaningful structure for any animal requires that a functional interaction be established (Kolasa and Rollo, 1991;McCoy and Bell, 1991;Cale and Hobbs, 1994), which means that a priori information on finer-scale relationships must be established through carefully designed mensurative or manipulative experiments. Figure 16 Overview of the structure and flow of information in an integrated multiscale approach to collecting, classifying and mapping benthic structure.…”

Section: Delineating Functionally-meaningful Patternmentioning

confidence: 99%

Movements of Marine Fish and Decapod Crustaceans: Process, Theory and Application

Pittman

McAlpine

2003

Advances in Marine Biology

218

178

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“…Furthermore, our study points out the importance of the disturbance heterogeneity hypothesis (DHH) (Kolasa & Rollo, 1991) as a possible mechanism for shaping spatially correlated landscapes. This model describes a quadratic relationship between the size of disturbance relative to the total area and the community heterogeneity.…”

Section: Discussionmentioning

confidence: 75%

Biomass–Diversity Responses and Spatial Dependencies in Disturbed Tallgrass Prairies

Gamarra

Solé

2002

Journal of Theoretical Biology

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Monotonic, hump-shaped and zero-correlation productivity-diversity relationships have been found to date in many ecosystems. This diversity of responses has puzzled ecologists in their search for general principles on ecosystem functioning. Some state that the scale of observation is crucial in defining this relationship. We have developed a spatial model of tallgrass prairies where biomass and litter dynamics are defined by uncoupled difference equations. In this system, we periodically apply prescribed fire as a disturbance that propagates through neighboring cells. The model shows percolation thresholds at points where small-scale spatial heterogeneity and large-scale, global correlation coexist, resulting in power-law distributions in available areas for non-dominant species. These points maximize the biomass-diversity relationship. Our results suggest that spatial dependencies and the disturbance heterogeneity hypothesis are the cornerstone processes accounting for unimodality in productivity-diversity relationships.

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Introduction: The Heterogeneity of Heterogeneity: A Glossary

Cited by 214 publications

References 24 publications

Finescale topographical correlates of behavioural investment in offspring by female grey seals, Halichoerus grypus

Finescale topographical correlates of behavioural investment in offspring by female grey seals, Halichoerus grypus

Movements of Marine Fish and Decapod Crustaceans: Process, Theory and Application

Biomass–Diversity Responses and Spatial Dependencies in Disturbed Tallgrass Prairies

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