Intraspecific Interaction and Mechanisms of Population Regulation in Experimentally Limited Habitat

Bancroft, J. S.

doi:10.1603/0046-225x-30.6.1061

Cited by 7 publications

(7 citation statements)

References 63 publications

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“…Both adults and larvae were added as a starter population to mimic more closely established local populations, avoid time lags, and buffer against crashes associated with density-dependent cannibalism [14]. Initial population sizes were chosen to approximate the maximal carrying capacity of the landscape, based on preliminary trials.…”

Section: Methodsmentioning

confidence: 99%

“…All experimental patches received 6 adults and 18 larvae released on 3 g of medium (flour in habitats and dextrose in marginal habitats) inside the small dish of each patch (total = 24 adults and 72 larvae per landscape). Both adults and larvae were added as a starter population to mimic more closely established local populations, avoid time lags, and buffer against crashes associated with density-dependent cannibalism [14] . Initial population sizes were chosen to approximate the maximal carrying capacity of the landscape, based on preliminary trials.…”

Section: Methodsmentioning

confidence: 99%

“…Gradual depletion of resources from a patch, while reducing carrying capacity, does not alter the connectivity between patches in a landscape. Rather, gradual depletion can induce higher adult dispersal and mortality and lower reproduction, while increasing immature mortality and development time [14] . In contrast, rapid destruction of a patch in a landscape reduces the number of habitats available for occupancy, increases inter-patch distances, decreases connectivity of resource patches, and can lead to rapid extinction beyond a critical threshold of loss [14] , [15] .…”

Section: Introductionmentioning

confidence: 99%

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Experimental Beetle Metapopulations Respond Positively to Dynamic Landscapes and Reduced Connectivity

Govindan¹

2012

PLoS ONE

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Interactive effects of multiple environmental factors on metapopulation dynamics have received scant attention. We designed a laboratory study to test hypotheses regarding interactive effects of factors affecting the metapopulation dynamics of red flour beetle, Tribolium castaneum. Within a four-patch landscape we modified resource level (constant and diminishing), patch connectivity (high and low) and patch configuration (static and dynamic) to conduct a 23 factorial experiment, consisting of 8 metapopulations, each with 3 replicates. For comparison, two control populations consisting of isolated and static subpopulations were provided with resources at constant or diminishing levels. Longitudinal data from 22 tri-weekly counts of beetle abundance were analyzed using Bayesian Poisson generalized linear mixed models to estimate additive and interactive effects of factors affecting abundance. Constant resource levels, low connectivity and dynamic patches yielded greater levels of adult beetle abundance. For a given resource level, frequency of colonization exceeded extinction in landscapes with dynamic patches when connectivity was low, thereby promoting greater patch occupancy. Negative density dependence of pupae on adults occurred and was stronger in landscapes with low connectivity and constant resources; these metapopulations also demonstrated greatest stability. Metapopulations in control landscapes went extinct quickly, denoting lower persistence than comparable landscapes with low connectivity. When landscape carrying capacity was constant, habitat destruction coupled with low connectivity created asynchronous local dynamics and refugia within which cannibalism of pupae was reduced. Increasing connectivity may be counter-productive and habitat destruction/recreation may be beneficial to species in some contexts.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental Beetle Metapopulations Respond Positively to Dynamic Landscapes and Reduced Connectivity

Govindan¹

2012

PLoS ONE

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“…It could be suggested that the differences in the produced progeny and the loss percentage between the date fruit cultivars may be due to the differences in the chemical properties of date fruit cultivars (Tables 2, 3) and the competition on food resources which may be occurred between the produced progeny in each date fruits cultivar. Bancroft (2001) found that, O. surinamensis has strong negative exponential feedback on reproduction, mortality and dispersal in response to density and food quality. Density and food limitation cause direct and indirect population control.…”

Section: Resultsmentioning

confidence: 99%

“…A tremendous amount of effort has been spent trying to determine the forces that regulate populations of insect pests, and the importance of density dependence continues to be vigorously debated (Dempster 1983;Dempster and Pollard 1986;Den Boer 1988;Turchin et al 1998). Bancroft (2001) used the saw-toothed grain beetle, O. surinamensis as a model to gain insight into the mechanisms of population regulation. He found that, food depletion caused increased mortality of immature beetles, sharply reduced oviposition, and increased adult dispersal.…”

Section: Introductionmentioning

confidence: 99%

SUSCEPTIBILITY OF COMMERCIAL FRUITS OF DATE PALM CULTIVARS TO Oryzaephilus surinamensis (L.) INFESTATION

Aljabr

2007

Journal of Plant Protection and Pathology

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Laboratory studies were carried out to investigate the susceptibility of seven date palm fruit cultivars to the Oryzaephilus surinamensis infestation. Chemical properties of these fruits were also determined to emphasize their relation with the number of progeny produced by the 0. surinamensis and the loss percentage caused in the fruits.Date fruits of all examined date palm cultivars were relatively susceptible to 0. surinamensis infestation. Clear significant differences were found between the fruit cultivars in the number of 0. surinamensis progeny produced and loss percentage. The fruit cultivars showed clearly differences in their chemical properties which are positively significant correlated with the number of progeny and loss percentage. Amino acids followed by carbohydrates were considered the most important fruits components which affected the number of progeny produced by 0. surinamensis.

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Hagstrum

2009

Stored-Product Insect Resource

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Intraspecific Interaction and Mechanisms of Population Regulation in Experimentally Limited Habitat

Cited by 7 publications

References 63 publications

Experimental Beetle Metapopulations Respond Positively to Dynamic Landscapes and Reduced Connectivity

Experimental Beetle Metapopulations Respond Positively to Dynamic Landscapes and Reduced Connectivity

SUSCEPTIBILITY OF COMMERCIAL FRUITS OF DATE PALM CULTIVARS TO Oryzaephilus surinamensis (L.) INFESTATION

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