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  • Lingj-rde_et_al-2001-Ecology

    Rights statement: Copyright 2001 by the Ecological Society of America

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Exploring the density-dependent structure of blowfly populations by nonparametric additive modeling

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Exploring the density-dependent structure of blowfly populations by nonparametric additive modeling. / Lingjaerde, Ole C.; Stenseth, Nils Chr.; Kristoffersen, Anja B. et al.
In: Ecology, Vol. 82, No. 9, 09.2001, p. 2645-2658.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

Lingjaerde, OC, Stenseth, NC, Kristoffersen, AB, Smith, RH, Moe, SJ, Read, JM, Daniels, S & Simkiss, K 2001, 'Exploring the density-dependent structure of blowfly populations by nonparametric additive modeling', Ecology, vol. 82, no. 9, pp. 2645-2658. https://doi.org/10.1890/0012-9658(2001)082[2645:ETDDSO]2.0.CO;2

APA

Lingjaerde, O. C., Stenseth, N. C., Kristoffersen, A. B., Smith, R. H., Moe, S. J., Read, J. M., Daniels, S., & Simkiss, K. (2001). Exploring the density-dependent structure of blowfly populations by nonparametric additive modeling. Ecology, 82(9), 2645-2658. https://doi.org/10.1890/0012-9658(2001)082[2645:ETDDSO]2.0.CO;2

Vancouver

Lingjaerde OC, Stenseth NC, Kristoffersen AB, Smith RH, Moe SJ, Read JM et al. Exploring the density-dependent structure of blowfly populations by nonparametric additive modeling. Ecology. 2001 Sept;82(9):2645-2658. doi: 10.1890/0012-9658(2001)082[2645:ETDDSO]2.0.CO;2

Author

Lingjaerde, Ole C. ; Stenseth, Nils Chr. ; Kristoffersen, Anja B. et al. / Exploring the density-dependent structure of blowfly populations by nonparametric additive modeling. In: Ecology. 2001 ; Vol. 82, No. 9. pp. 2645-2658.

Bibtex

@article{76b36225136b476b9b7f1846b502e8d8,
title = "Exploring the density-dependent structure of blowfly populations by nonparametric additive modeling",
abstract = "Abundances of 12 laboratory populations of the greenbottle blowfly (Lucilia sericata) were recorded every two days for 776 d, with separate counts for larvae, pupae, and adults. Half of the populations were exposed to sublethal dosages of the toxic compound cadmium acetate; the remaining populations were considered controls. Initial density was low for half of the populations in each group, and high for the other half. In all populations, the adult abundance underwent sustained fluctuations. However, cadmium-exposed populations had smaller mean larval and adult densities, and fluctuations in adult abundance were less regular than for controls. Data from the first and the second half of the experimental period were analyzed separately in order to assess the effects of possible long-term changes in the dynamics on the estimates. Nonparametric (generalized) additive modeling (GAM) was used to investigate time series dynamics and, in particular, to explore the density-independent components and the structure of the density-dependent components of the system. Overall, cadmium populations had larger larva-to-adult survival rate and smaller adult survival rate than control populations, and for the second half of the experimental period the reproductive rate was smaller for cadmium populations than for control populations. Estimation of the density-dependent components suggested that survival from larva to adult depended nonlinearly on larval density and that increased larval density had a positive effect on larval survival at low densities. Furthermore, cadmium generally decreased vital rates. However, the analysis suggested that most of the observed differences in dynamical behavior between control and cadmium populations are related to differences in the density-independent components of the demographic rates, rather than differences in the density-dependent structure.",
keywords = "additive models, greenbottle blowfly, cadmium, density-dependent and density-independent, components, ecotoxicology, generalized additive model (GAM), Lucilia sericata, nonlinearities, nonparametric regression, population model, time series analysis, TIME-SERIES ANALYSIS, DYNAMICS, CYCLES, CHAOS, SURVIVAL, GROWTH, FOOD",
author = "Lingjaerde, {Ole C.} and Stenseth, {Nils Chr.} and Kristoffersen, {Anja B.} and Smith, {Robert H.} and Moe, {S. Jannicke} and Read, {Jonathan M.} and Susan Daniels and Ken Simkiss",
note = "Copyright 2001 by the Ecological Society of America",
year = "2001",
month = sep,
doi = "10.1890/0012-9658(2001)082[2645:ETDDSO]2.0.CO;2",
language = "English",
volume = "82",
pages = "2645--2658",
journal = "Ecology",
issn = "0012-9658",
publisher = "Ecological Society of America",
number = "9",

}

RIS

TY - JOUR

T1 - Exploring the density-dependent structure of blowfly populations by nonparametric additive modeling

AU - Lingjaerde, Ole C.

AU - Stenseth, Nils Chr.

AU - Kristoffersen, Anja B.

AU - Smith, Robert H.

AU - Moe, S. Jannicke

AU - Read, Jonathan M.

AU - Daniels, Susan

AU - Simkiss, Ken

N1 - Copyright 2001 by the Ecological Society of America

PY - 2001/9

Y1 - 2001/9

N2 - Abundances of 12 laboratory populations of the greenbottle blowfly (Lucilia sericata) were recorded every two days for 776 d, with separate counts for larvae, pupae, and adults. Half of the populations were exposed to sublethal dosages of the toxic compound cadmium acetate; the remaining populations were considered controls. Initial density was low for half of the populations in each group, and high for the other half. In all populations, the adult abundance underwent sustained fluctuations. However, cadmium-exposed populations had smaller mean larval and adult densities, and fluctuations in adult abundance were less regular than for controls. Data from the first and the second half of the experimental period were analyzed separately in order to assess the effects of possible long-term changes in the dynamics on the estimates. Nonparametric (generalized) additive modeling (GAM) was used to investigate time series dynamics and, in particular, to explore the density-independent components and the structure of the density-dependent components of the system. Overall, cadmium populations had larger larva-to-adult survival rate and smaller adult survival rate than control populations, and for the second half of the experimental period the reproductive rate was smaller for cadmium populations than for control populations. Estimation of the density-dependent components suggested that survival from larva to adult depended nonlinearly on larval density and that increased larval density had a positive effect on larval survival at low densities. Furthermore, cadmium generally decreased vital rates. However, the analysis suggested that most of the observed differences in dynamical behavior between control and cadmium populations are related to differences in the density-independent components of the demographic rates, rather than differences in the density-dependent structure.

AB - Abundances of 12 laboratory populations of the greenbottle blowfly (Lucilia sericata) were recorded every two days for 776 d, with separate counts for larvae, pupae, and adults. Half of the populations were exposed to sublethal dosages of the toxic compound cadmium acetate; the remaining populations were considered controls. Initial density was low for half of the populations in each group, and high for the other half. In all populations, the adult abundance underwent sustained fluctuations. However, cadmium-exposed populations had smaller mean larval and adult densities, and fluctuations in adult abundance were less regular than for controls. Data from the first and the second half of the experimental period were analyzed separately in order to assess the effects of possible long-term changes in the dynamics on the estimates. Nonparametric (generalized) additive modeling (GAM) was used to investigate time series dynamics and, in particular, to explore the density-independent components and the structure of the density-dependent components of the system. Overall, cadmium populations had larger larva-to-adult survival rate and smaller adult survival rate than control populations, and for the second half of the experimental period the reproductive rate was smaller for cadmium populations than for control populations. Estimation of the density-dependent components suggested that survival from larva to adult depended nonlinearly on larval density and that increased larval density had a positive effect on larval survival at low densities. Furthermore, cadmium generally decreased vital rates. However, the analysis suggested that most of the observed differences in dynamical behavior between control and cadmium populations are related to differences in the density-independent components of the demographic rates, rather than differences in the density-dependent structure.

KW - additive models

KW - greenbottle blowfly

KW - cadmium

KW - density-dependent and density-independent

KW - components

KW - ecotoxicology

KW - generalized additive model (GAM)

KW - Lucilia sericata

KW - nonlinearities

KW - nonparametric regression

KW - population model

KW - time series analysis

KW - TIME-SERIES ANALYSIS

KW - DYNAMICS

KW - CYCLES

KW - CHAOS

KW - SURVIVAL

KW - GROWTH

KW - FOOD

U2 - 10.1890/0012-9658(2001)082[2645:ETDDSO]2.0.CO;2

DO - 10.1890/0012-9658(2001)082[2645:ETDDSO]2.0.CO;2

M3 - Journal article

VL - 82

SP - 2645

EP - 2658

JO - Ecology

JF - Ecology

SN - 0012-9658

IS - 9

ER -