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Instream and offstream environmental conditions and stream biotic integrity

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  • Bedoya, David
  • Novotny, Vladimir
  • Manolakos, Elias S.

Abstract

Two different methods to predict biotic integrity were tested and compared in the present paper. The first one tries to predict the fish indices of biotic integrity (IBI) at the state or regional scale based on the most similar observations to a specific target site of interest using the simple to implement k-nearest neighbors (or kNN) method. Two different distance functions were considered to find the k-nearest neighbors: the Euclidean and the Mahalanobis. The second method was applied on the same datasets and consisted of a step-wise multiple regression. The two modeling approaches yielded similar results but kNN proved to be more time-efficient and very fast computationally for the given dataset sizes, which allowed applying a leave-one-out cross validation.

Suggested Citation

  • Bedoya, David & Novotny, Vladimir & Manolakos, Elias S., 2009. "Instream and offstream environmental conditions and stream biotic integrity," Ecological Modelling, Elsevier, vol. 220(19), pages 2393-2406.
    • Handle: RePEc:eee:ecomod:v:220:y:2009:i:19:p:2393-2406
    DOI: 10.1016/j.ecolmodel.2009.06.017
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    References listed on IDEAS

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    1. Kruk, A. & Lek, S. & Park, Y.-S. & Penczak, T., 2007. "Fish assemblages in the large lowland Narew River system (Poland): Application of the self-organizing map algorithm," Ecological Modelling, Elsevier, vol. 203(1), pages 45-61.
    2. Park, Young-Seuk & Song, Mi-Young & Park, Young-Cheol & Oh, Kyung-Hee & Cho, Eungchun & Chon, Tae-Soo, 2007. "Community patterns of benthic macroinvertebrates collected on the national scale in Korea," Ecological Modelling, Elsevier, vol. 203(1), pages 26-33.
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    1. Bedoya, David & Manolakos, Elias S. & Novotny, Vladimir, 2011. "Characterization of biological responses under different environmental conditions: A hierarchical modeling approach," Ecological Modelling, Elsevier, vol. 222(3), pages 532-545.
    2. Penczak, Tadeusz, 2011. "Fish assemblages composition in a natural, then regulated, stream: A quantitative long-term study," Ecological Modelling, Elsevier, vol. 222(13), pages 2103-2118.
    3. Penczak, T. & Głowacki, Ł. & Kruk, A. & Galicka, W., 2012. "Implementation of a self-organizing map for investigation of impoundment impact on fish assemblages in a large, lowland river: Long-term study," Ecological Modelling, Elsevier, vol. 227(C), pages 64-71.

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