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Determining factors that influence the dispersal of a pelagic species: A comparison between artificial neural networks and evolutionary algorithms

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  • Pontin, D.R.
  • Schliebs, S.
  • Worner, S.P.
  • Watts, M.J.

Abstract

Because of increasing transport and trade there is a growing threat of marine invasive species being introduced into regions where they do not presently occur. So that the impacts of such species can be mitigated, it is important to predict how individuals, particularly passive dispersers are transported and dispersed in the ocean as well as in coastal regions so that new incursions of potential invasive species are rapidly detected and origins identified. Such predictions also support strategic monitoring, containment and/or eradication programs. To determine factors influencing a passive disperser, around coastal New Zealand, data from the genus Physalia (Cnidaria: Siphonophora) were used. Oceanographic data on wave height and wind direction and records of occurrences of Physalia on swimming beaches throughout the summer season were used to create models using artificial neural networks (ANNs) and Naϊve Bayesian Classifier (NBC). First, however, redundant and irrelevant data were removed using feature selection of a subset of variables. Two methods for feature selection were compared, one based on the multilayer perceptron and another based on an evolutionary algorithm. The models indicated that New Zealand appears to have two independent systems driven by currents and oceanographic variables that are responsible for the redistribution of Physalia from north of New Zealand and from the Tasman Sea to their subsequent presence in coastal waters. One system is centred in the east coast of northern New Zealand and the other involves a dynamic system that encompasses four other regions on both coasts of the country. Interestingly, the models confirm, molecular data obtained from Physalia in a previous study that identified a similar distribution of systems around New Zealand coastal waters. Additionally, this study demonstrates that the modelling methods used could generate valid hypotheses from noisy and complicated data in a system about which there is little previous knowledge.

Suggested Citation

  • Pontin, D.R. & Schliebs, S. & Worner, S.P. & Watts, M.J., 2011. "Determining factors that influence the dispersal of a pelagic species: A comparison between artificial neural networks and evolutionary algorithms," Ecological Modelling, Elsevier, vol. 222(10), pages 1657-1665.
    • Handle: RePEc:eee:ecomod:v:222:y:2011:i:10:p:1657-1665
    DOI: 10.1016/j.ecolmodel.2011.03.002
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    Cited by:

    1. Crisci, C. & Ghattas, B. & Perera, G., 2012. "A review of supervised machine learning algorithms and their applications to ecological data," Ecological Modelling, Elsevier, vol. 240(C), pages 113-122.

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