Abstract
Finding empirical support for the “paradigm of density-dependence” has been a major focus of ecological and fishery research. Quantifying relationships between the abundance of spawners and the subsequent recruitment is essential for testing the key prediction of density-dependent population regulation: that the number of recruits is mechanistically, but non-linearly, dependent on the number of reproducing individuals. Long-term data are required to explore such relationships, but such data are rare. Elliott and colleagues used a 30-year study of brown trout, Salmo trutta L. in a small UK stream to construct a stock–recruitment relationship suggesting remarkably severe density-dependent mortality of recruits at high spawners’ abundance. In marked contrast, more recent studies on other brown trout populations, suggest environmental (hydrological) factors play a principal role in driving variation in recruitment. These disparate results underscore the more general controversy regarding the relative roles of density-dependent versus density-independent population regulation. The objective of this study was to revisit and re-analyze the data reported by Elliott in light of recent results from other trout populations. The results suggest that variation in stream discharge soon after emergence drives variation in recruitment and early survival rates, and produces the same two-phase, threshold-like recruitment patterns observed in other brown trout populations. These results cast doubt on the original interpretation of the data, and add to a growing body of evidence that environmental (hydrological) factors are the principal drivers of recruitment variation in stream-rearing salmonids.
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References
Andrewartha HG, Birch LC (1954) The distribution and abundance of animals. University of Chicago Press
Bradford MJ Cabana G (1997) Interannual variability in stage-specific survival rates and the causes of recruitment variation. In Chambers RC, Trippel EA (eds) Early life history and recruitment in fish populations. Fish and fisheries series, vol 21. Chapman and Hall, New York, pp 469–493. doi:https://doi.org/10.1007/978-94-009-1439-1-17
Burham KP, Anderson DR (2002) Model selection and multimodel inferences. A practical information – theoretic approach, 2nd edn. Springer, New York, p 488
Cattanéo FN, Lamouroux P, Breil R, Capra H (2002) The influence of hydrological and biotic processes on brown trout (Salmo trutta) population dynamics. Can J Fish Aquat Sci 59:12–22
Chambers RC, Trippel EA (eds) (1997) Early life history and recruitment in fish populations. Fish Fish Series 21. Chapman and Hall, New York
Coulson T, Rohan P, Pascual M (2004) Skeletons, noise and population growth: the end of an old debate? TREE 19:359–364
Cushing DH (1996) Towards a science of recruitment in fish populations. Excellence in Ecology, Ecology Institute, Oldendorf/Luhe, 175 p
Elliott JM (1984) Numerical changes and population regulation in young migratorytrout Salmo trutta in a Lake District stream, 1966-83. J Anim Ecol 53:327–350
Elliott JM (1985) Population regulation for different life-stages of migratory trout Salmo trutta in a Lake District stream, 1966-83. J Anim Ecol 54:617–638
Elliott JM (1987) Population regulation in contrasting populations of trout Salmo trutta in two Lake District streams. J Anim Ecol 56:83–98
Elliott JM (1989) The natural regulation of numbers and growth in contrasting populations of brown trout, Salmo trutta, in two Lake District streams. Freshw Biol 21:7–19
Elliott JM (1993) A 25-year study of production of juvenile sea-trout, Salmo trutta, in an English Lake District stream. Can Sp Pub Fish Aquat Sci 118:109–122
Elliott JM (1994) Quantitative ecology and the brown trout. Oxford Series in Ecology and Evolution. Oxford University Press, Oxford, p 286
Elliott JM, Elliott JA (2006) A 35-year study of stock-recruitment relationships in a small population of Sea Trout: assumptions, implications and limitations for predicting targets. In: Harris G, Milner N (eds) Sea trout, biology, conservation and management. Blackwell, Oxford, pp 257–278
Elliott JM, Hurley MA, Elliott JA (1997) Variable effects of droughts on the density of a sea-trout Salmo trutta population over 30 years. J Appl Ecol 34:1229–1238
Frank KT, Leggett WC (1994) Fisheries ecology in the context of ecological and evolutionary theory. Annu Rev Ecol Syst 25:401–422
Grossman GD, Ratajczak RE, Wagner CM, Petty JT (2010) Dynamics and regulation of the southern brook trout (Salvelinus fontinalis) population in an Appalachian stream. Freshw Biol 55:1494–1508. https://doi.org/10.1111/j.1365-2427.2009.02361.x
Grossman GD, Nuhfer A, Zorn T, Sundin G, Alexander G (2012) Population regulation of brook trout (Salvelinus fontinalis) in Hunt Creek, Michigan: a 50-year study. Freshw Biol 57:1434–1448. https://doi.org/10.1111/j.1365-2427.2012.02806.x
Hilborn R, Walters CJ (1992) Quantitative fisheries stock assessments: Choice, dynamics and uncertainty. Chapman and Hall, New York
Houde ED (1989) Subtleties and episodes in the early life of fishes. J Fish Biol 35(Suppl. A):29–38
Kanno Y, Pregler KC, Hitt NP, Letcher BH, Hocking J, Wofford JEB (2015) Seasonal temperature and precipitation regulate brook trout young-of-the-year abundance and population dynamics. Freshw Biol. https://doi.org/10.1111/fwb.12682
Krebs CJ (2002) Two complementary paradigms for analyzing population dynamics. Philos Trans R Soc Lond B 357:1211–1219. https://doi.org/10.1098/rstb.2002.1122
Lobón-Cerviá J (2006) Instability of stream salmonid population dynamics under strong environmental limitations - a reply. Oikos 114:376–380
Lobón-Cerviá J (2007) Numerical changes in stream-resident brown trout (Salmo trutta): uncovering the roles of density-dependent and density-independent factors across space ad time. Can J Fish Aquat Sci 64:1429–1447. https://doi.org/10.1139/F07-111
Lobón-Cerviá J (2012) Density-dependent mortality in adults, but not juveniles, of stream-resident brown trout (Salmo trutta). Freshw Biol 57:2181–2189. https://doi.org/10.1111/j.1365-2427.2012.02863.x
Lobón-Cerviá J, Mortensen E (2005) Population size in stream-living juveniles of lake-migratory brown trout Salmo trutta L.: the importance of stream discharge and temperature. Ecol Freshw Fish 14:394–401
Lobón-Cerviá J, Rincón PA (2004) Environmental determinants of recruitment and their influence on the population dynamics of stream-living brown trout Salmo trutta. Oikos 105:641–646
Lobón-Cerviá J, Rasmussen GH, Mortensen E (2017) Discharge-dependent recruitment in stream-dwelling brown trout. In: Lobón-Cerviá J, Sanz N (eds) Brown trout: biology, ecology and management. Wiley, Chichester, pp 297–318
Lobón-Cerviá J, Gonzalez G, Budy P (2011) Factors driving spatial and temporal variations in production and production/biomass ratios of stream-resident brown trout in cantabrian streams. Freshw Biol 56, 2272–2287
Motulsky H, Christopoulos A (2004) Fitting models to biological data using linear and nonlinear regression. A practical guide to curve fitting. Oxford University Press, Oxford, New York
Nicholson AJ (1933) The balance of animal populations. J Anim Ecol 2:132–178
Ricker WE (1954) Stock and recruitment. J Fish Res Board Can 11:559–623
Trippel EA, Kjesbu OS, Solemdal P (1997) Effects of adult age and size structure on reproductive output in marine fishes. In: Chambers RC, Trippel EA (eds) Early life history and recruitment in fish populations. Fish Fish Series 21. Chapman Hall, New York, pp 31–62
Walters CJ, Martell SJD (2004) Fisheries ecology and management. Princeton University Press, Princeton
Ackowledgements
Comments and suggestions of numerous individuals were instrumental in completing an early draft. John Armstrong provided environmental data; Thomas Jenkins, Kyle Young, Gorm Rasmussen, Gary Grossman, Phaedra Budy, Nigel Milner and Asbjorn Vollestad revised point by point and improved substantially the English style. Their efforts and unlimited patience are warmly acknowledged.
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Lobón-Cerviá, J., Rasmussen, G. (2024). The Ghost of Density-Dependence: Environmental (Hydrological) Factors Drive the Numerical Changes of Young Migratory Trout Salmo trutta in a Lake District Stream (UK), 1966–1996. In: Lobon-Cervia, J., Budy, P., Gresswell, R. (eds) Advances in the Ecology of Stream-Dwelling Salmonids. Fish & Fisheries Series, vol 44. Springer, Cham. https://doi.org/10.1007/978-3-031-44389-3_5
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