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Disentangling the effects of heterogeneity, stochastic dynamics and sampling in a community of aquatic insects

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  • Engen, Steinar
  • Aagaard, Kaare
  • Bongard, Terje

Abstract

A dynamic and heterogeneous species abundance model generating the lognormal species abundance distribution is fitted to time series of species data from an assemblage of stoneflies and mayflies (Plecoptera and Ephemeroptera) of an aquatic insect community collected over a period of 15 years. In each year except one, we analyze 5 parallel samples taken at the same time of the season giving information about the over-dispersion in the sampling relative to the Poisson distribution. Results are derived from a correlation analysis, where the correlation in the bivariate normal distribution of log abundance is used as measurement of similarity between communities. The analysis enables decomposition of the variance of the lognormal species abundance distribution into three components due to heterogeneity among species, stochastic dynamics driven by environmental noise, and over-dispersion in sampling, accounting for 62.9, 30.6 and 6.5% of the total variance, respectively. Corrected for sampling the heterogeneity and stochastic components accordingly account for 67.3 and 32.7% of the among species variance in log abundance. By using this method, it is possible to disentangle the effect of heterogeneity and stochastic dynamics by quantifying these components and correctly remove sampling effects on the observed species abundance distribution.

Suggested Citation

  • Engen, Steinar & Aagaard, Kaare & Bongard, Terje, 2011. "Disentangling the effects of heterogeneity, stochastic dynamics and sampling in a community of aquatic insects," Ecological Modelling, Elsevier, vol. 222(8), pages 1387-1393.
    • Handle: RePEc:eee:ecomod:v:222:y:2011:i:8:p:1387-1393
    DOI: 10.1016/j.ecolmodel.2011.01.008
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    References listed on IDEAS

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    1. Brian J. McGill, 2003. "A test of the unified neutral theory of biodiversity," Nature, Nature, vol. 422(6934), pages 881-885, April.
    2. Beeravolu, Champak R. & Couteron, Pierre & Pélissier, Raphaël & Munoz, François, 2009. "Studying ecological communities from a neutral standpoint: A review of models’ structure and parameter estimation," Ecological Modelling, Elsevier, vol. 220(20), pages 2603-2610.
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    1. Solbu, Erik B. & Diserud, Ola H. & Kålås, John A. & Engen, Steinar, 2018. "Heterogeneity among species and community dynamics—Norwegian bird communities as a case study," Ecological Modelling, Elsevier, vol. 388(C), pages 13-23.
    2. Solbu, Erik Blystad & Engen, Steinar & Diserud, Ola HÃ¥vard, 2016. "Characteristics of temporal changes in communities where dynamics differ between species," Theoretical Population Biology, Elsevier, vol. 111(C), pages 65-74.

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