Hydrobiologia

, Volume 583, Issue 1, pp 57–68 | Cite as

Density-dependent individual growth of marble trout (Salmo marmoratus) in the Soca and Idrijca river basins, Slovenia

  • Simone Vincenzi
  • Alain J. Crivellì
  • Dusan Jesensek
  • Jean-Francois Rubin
  • Giulio A. De Leo
Primary Research Paper

Abstract

Although the main features of salmonid life cycles are currently well known, marble trout (Salmo marmoratus) populations have been scarcely studied due to the present limited geographical distribution of the species. In this work we tested the hypothesis of density-dependent individual growth of marble trout with data gathered from multi-year on-going monitoring started in 1996 in three streams (Zakojska, Gorska and Gatsnik) in the Soca and Idrijca river basins (Slovenia). As observed for other salmonid species, marble trout exhibits high plasticity in body size and growth in response to environmental conditions. Age-specific mean lengths are significantly different among the three streams. Despite this variability, the statistical analyses outlined some clear patterns. Mean lengths of marble trout cohorts aged ≥1+ are correlated with total population density in the first year of life of the cohorts; the age-specific relationship between mean length and total density is well explained by negative power curves. Length of marble trout at age 1+ is significantly correlated with length at subsequent years up to age 4+. ANCOVAs performed on the stream-specific datasets showed a significant effect of total density of marble trout on annual age-specific individual growth rates. Von Bertalanffy’s body growth models were calibrated on length–age data of Zakojska and Gorska marble trout. Our analysis shows the existence of density-dependent effects on growth of marble trout that might be crucial in regulating population dynamics.

Keywords

Marble trout Salmo marmoratus Individual growth Density-dependent growth 

Notes

Acknowledgements

We thank Fondation Tour du Valat and the Angling Association of Tolmin for funding this study. All the people who have participated each year to the fieldwork are warmly thanked. We thank Patrick Clevestam and Magnus Gehlin for helping us to get the Carlin marks, and S. Sumer for undertaking IBGN and benthos biomass investigations. We also thank Marino Gatto for helpful review of the manuscript. The author also thanks three anonymous referees for their valuable suggestions to improve a first draft of the MS. The authors thank the Italian Minister of Research for having partially supported the present work under an internationalization project.

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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  • Simone Vincenzi
    • 1
  • Alain J. Crivellì
    • 2
  • Dusan Jesensek
    • 3
  • Jean-Francois Rubin
    • 4
  • Giulio A. De Leo
    • 1
  1. 1.Dipartimento di Scienze AmbientaliUniversità degli Studi di ParmaParmaItaly
  2. 2.Station Biologique de la Tour du Valat, Le SambucArlesFrance
  3. 3.Tolmin Angling AssociationMost na SociSlovenia
  4. 4.Ecole d’ingénieurs HESGenevaSwitzerland

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