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Influences of size and sex on invasive species aggression and native species vulnerability: a case for modern regression techniques

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Abstract

Animal behaviour is of fundamental importance but is often overlooked in biological invasion research. A problem with such studies is that they may add pressure to already threatened species and subject vulnerable individuals to increased risk. One solution is to obtain the maximum possible information from the generated data using a variety of statistical techniques, instead of solely using simple versions of linear regression or generalized linear models as is customary. Here, we exemplify and compare the use of modern regression techniques which have very different conceptual backgrounds and aims (negative binomial models, zero-inflated regression, and expectile regression), and which have rarely been applied to behavioural data in biological invasion studies. We show that our data display overdispersion, which is frequent in ecological and behavioural data, and that conventional statistical methods such as Poisson generalized linear models are inadequate in this case. Expectile regression is similar to quantile regression and allows the estimation of functional relationships between variables for all portions of a probability distribution and is thus well suited for modelling boundaries in polygonal relationships or cases with heterogeneous variances which are frequent in behavioural data. We applied various statistical techniques to aggression in invasive mosquitofish, Gambusia holbrooki, and the concomitant vulnerability of native toothcarp, Aphanius iberus, in relation to individual size and sex. We found that medium sized male G. holbrooki carry out the majority of aggressive acts and that smaller and medium size A. iberus are most vulnerable. Of the regression techniques used, only negative binomial models and zero-inflated and expectile Poisson regressions revealed these relationships.

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Acknowledgments

This research was supported by a Marie Curie International Reintegration Grant within the 7th European Community Framework Programme (KM). Additional support was provided by the Spanish Ministry of Economy and Competitiveness (project CGL2013-43822-R), the University of Girona (project SING12/09), the Government of Catalonia (ref. 2014 SGR 484), and the European Commission (COST Action TD1209). We thank E. Perez for assistance with laboratory set up, G. Carmona-Catot for help with fish collection, and Brian S. Cade and anonymous reviewers for comments on earlier versions of this manuscript.

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  1. GRECO, Institute of Aquatic Ecology, University of Girona, 17071, Girona, Spain

    Kit Magellan & Emili García-Berthou

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  1. Kit Magellan
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Correspondence to Kit Magellan.

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Magellan, K., García-Berthou, E. Influences of size and sex on invasive species aggression and native species vulnerability: a case for modern regression techniques. Rev Fish Biol Fisheries 25, 537–549 (2015). https://doi.org/10.1007/s11160-015-9391-0

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