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Discerning the causes of a decline in a common European fish, the roach (Rutilus rutilus L.): A modelling approach

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  • Otjacques, W.
  • De Laender, F.
  • Kestemont, P.

Abstract

Stock assessment of roach (Rutilus rutilus) in the river Meuse (Belgium), based on two decades of research, indicated a sudden stock decline since the early 2010s. While roach was very abundant during the 1990s and beginning of the 2000s with densities estimated around 3000–3700fishha−1, densities dropped below 400fishha−1 since 2010. A drop in primary production since 2005 and an increase in predation pressure by the Great cormorant (Phalacrocorax carbo) between 2000 and 2006 are listed among potential explanations. In the present study, three scenarios were explored using an age-structured Leslie matrix to investigate if bottom-up control (phytoplankton driven), top-down control (predation driven) or a combination of both can explain the observed decline of roach stock. Including only a phytoplankton-dependent reduction of carrying capacity into the model (i.e. bottom-up control) accurately predicted the observed densities. If only predation by wintering populations of Great Cormorant was considered, the model did not predict the observed decline in roach stock. Combining top-down and bottom-up effects into the model resulted in a comparable fit as when including bottom-up effects alone. Taken together, our results suggest that roach decline is mainly driven by phytoplankton decline.

Suggested Citation

  • Otjacques, W. & De Laender, F. & Kestemont, P., 2016. "Discerning the causes of a decline in a common European fish, the roach (Rutilus rutilus L.): A modelling approach," Ecological Modelling, Elsevier, vol. 322(C), pages 92-100.
  • Handle: RePEc:eee:ecomod:v:322:y:2016:i:c:p:92-100
    DOI: 10.1016/j.ecolmodel.2015.12.002
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    References listed on IDEAS

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    1. Ibrahim, Lara & Preuss, Thomas G. & Schaeffer, Andreas & Hommen, Udo, 2014. "A contribution to the identification of representative vulnerable fish species for pesticide risk assessment in Europe—A comparison of population resilience using matrix models," Ecological Modelling, Elsevier, vol. 280(C), pages 65-75.
    2. Stubben, Chris & Milligan, Brook, 2007. "Estimating and Analyzing Demographic Models Using the popbio Package in R," Journal of Statistical Software, Foundation for Open Access Statistics, vol. 22(i11).
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