An Experimental Analysis of Dispersal in the Flour Beetle, Tribolum Confusum

Naylor, Alfred F.

doi:10.2307/1929763

Cited by 54 publications

(30 citation statements)

References 12 publications

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“…That this factor can nevertheless play an important role has recently been demonstrated for two species of Tribolium. Naylor (81,82) has shown that as density of adult beetles per unit volume of available flour increases, proportionately fewer adults enter the flour because of re pulsion from imaginal smell. Sonleitner (124) has shown that a growing proportion of the beetles leave the medium at increasing initial densities, probably because of the higher concentrations of the repellent ethyl quinone distributed in the medium by the beetles.…”

Section: The Deleterious Effects Of Competitionmentioning

confidence: 99%

Intraspecific Competition and the Regulation of Insect Numbers

Klomp¹

1964

Annu. Rev. Entomol.

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In recent literature on the population dynamics of animals, there are at least two opposing opinions as to the maintenance of numbers. Some workers hold the view that there is a real regulation of numbers by feed-back mechanisms. Others are of the opinion that, in many cases at least, such mechanisms are not in operation and numbers fluctuate between relatively narrow limits due to the ever-changing influence of one or more (or a complex of) environmental factors. These concepts have been discussed at length in this Review by Solomon (123) and Nicholson (89) on the one hand, and Thompson (127) on the other. More data on this question can be found in Nicholson (88) and in Andrewartha & Birch (5), respectively. Arguments in favor of the former viewpoint can be found in recent papers of Wilbert (143, (64), in which models are given showing that the action of density-governing factors [definition in Nicholson (86)] is indispensable in explaining the numerical facts of populations, viz., constant mean density level and restricted fluctuation. 144) and KlompThe theory set forth by Nicholson (86, 88) implies that populations gen erally (exceptions are made for populations in fringe areas where the animals occur as a result of continuous immigration only), are really regulated, i.e., that increasing density, with or without a time lag, induces a higher mor tality rate or a lower reproductive rate or a higher rate of emigration, or a combination of two or three of these processesi decreasing density induces the reverse. This governing reaction operates at least over part of the density range.Field studies, laboratory experiments and models have suggested that, for the time being, we must recognize the following mechanisms of regulation:I. Regulation through interaction with organisms of another kind other than foodi such as the regulation of the density of prey-animals through the action of parasites, predators, or pathogens. [For literature see (56,123).] II. Regulation through interaction with organisms of the same kind. (A) Regulation through intraspecific competition: the organisms compete for some requisite which is in short supply. The literature is summarized in this paper. (i) The degree of depletion of the governing requisite and not its quantity produced is influenced by the competitors, e.g., competition for food among carrion feeders and fruit flies. (ii) Both the degree of depletion and the 1 The survey of the literature pertaining to this review was concluded in January 1963.2 My than ks are extended to Dr. K. Bakker of Leiden for the im provements he has proposed in the text. 17Annu. Rev. Entomol. 1964.9:17-40. Downloaded from www.annualreviews.org by University of Sussex on 10/08/12. For personal use only.Quick links to online content Further ANNUAL REVIEWS

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Section: The Deleterious Effects Of Competitionmentioning

confidence: 99%

Intraspecific Competition and the Regulation of Insect Numbers

Klomp¹

1964

Annu. Rev. Entomol.

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“…Furthermore, the number of adults found in vials of flour decreased with increasing larval density. The tendency of T. confusum to move to locations of unoccupied flour over occupied flour was also observed by Naylor [16].…”

Section: Density-dependent Dispersalmentioning

confidence: 55%

Spatial segregation in stage-structured populations with an application toTribolium

Robertson

Cushing

2011

Journal of Biological Dynamics

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Spatial segregation among life-cycle stages has been observed in many stage-structured species, including species of the flour beetle Tribolium. We investigate density-dependent dispersal of life-cycle stages as a possible mechanism responsible for this separation. We explore this hypothesis using stage-structured, integrodifference equation (IDE) models that incorporate density-dependent dispersal kernels. We first investigate mechanisms that can lead to spatial patterns in juvenile-adult IDE models. We show, via numerical simulation, that density-dependent dispersal can lead to the spatial segregation of life-cycle stages in the sense that each stage peaks in a different spatial location. We then construct a three-stage spatial model to describe the population dynamics of Tribolium castaneum and Tribolium confusum and assess density-dependent dispersal mechanisms that are able to explain spatial patterns that have been experimentally observed in these species.

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“…A major dispersal impetus in both Tribolium and O. surinamensis is poor food quality. For Tribolium dispersal, food quality seems to be more important than density (Naylor 1959(Naylor , 1961(Naylor , 1965. O. surinamensis dispersal accelerates rapidly with food depletion (Fig.…”

Section: Discussionmentioning

confidence: 99%

Intraspecific Interaction and Mechanisms of Population Regulation in Experimentally Limited Habitat

Bancroft¹

2001

Environ Entomol

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An Experimental Analysis of Dispersal in the Flour Beetle, Tribolum Confusum

Cited by 54 publications

References 12 publications

Intraspecific Competition and the Regulation of Insect Numbers

Intraspecific Competition and the Regulation of Insect Numbers

Spatial segregation in stage-structured populations with an application toTribolium

Intraspecific Interaction and Mechanisms of Population Regulation in Experimentally Limited Habitat

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