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Influence of hydrologic attributes on brown trout recruitment in low-latitude range margins

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Abstract

Factors controlling brown trout Salmo trutta recruitment in Mediterranean areas are largely unknown, despite the relevance this may have for fisheries management. The effect of hydrological variability on survival of young brown trout was studied during seven consecutive years in five resident populations from the southern range of the species distribution. Recruit density at the end of summer varied markedly among year-classes and rivers during the study period. Previous work showed that egg density the previous fall did not account for more than 50% of the observed variation in recruitment density. Thus, we expected that climatic patterns, as determinants of discharge and water temperature, would play a role in the control of young trout abundance. We tested this by analyzing the effects of flow variation and predictability on young trout survival during the spawning to emergence and the summer drought periods. Both hatching and emergence times and length of hatching and emergence periods were similar between years within each river but varied considerably among populations, due to differences in water temperature. Interannual variation in flow attributes during spawning to emergence and summer drought affected juvenile survival in all populations, once the effect of endogenous factors was removed. Survival rate was significantly related to the timing, magnitude and duration of extreme water conditions, and to the rate of change in discharge during hatching and emergence times in most rivers. The magnitude and duration of low flows during summer drought appeared to be a critical factor for survival of young trout. Our findings suggest that density-independent factors, i.e., hydrological variability, play a central role in the population dynamics of brown trout in populations from low-latitude range margins. Reported effects of hydrologic attributes on trout survival are likely to be increasingly important if, as predicted, climate change leads to greater extremes and variability of flow regimes.

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Acknowledgments

This study was supported by the Spanish National Institute of Agricultural Research (INIA) through research projects SC-9645 and SC-95/005. All field procedures complied with the current laws of Spain. We also acknowledge the very constructive criticism of three anonymous referees and the editor, Marc Mangel.

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Authors and Affiliations

  1. Department of Environmental Sciences, University of Castilla-La Mancha, 45071, Toledo, Spain

    Graciela G. Nicola

  2. Department of Zoology, Faculty of Biology, Complutense University of Madrid, 28040, Madrid, Spain

    Ana Almodóvar & Benigno Elvira

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  1. Graciela G. Nicola
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  2. Ana Almodóvar
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  3. Benigno Elvira
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Correspondence to Graciela G. Nicola.

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Communicated by Marc Mangel.

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Nicola, G.G., Almodóvar, A. & Elvira, B. Influence of hydrologic attributes on brown trout recruitment in low-latitude range margins. Oecologia 160, 515–524 (2009). https://doi.org/10.1007/s00442-009-1317-x

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