Influence of natural and regulated streamflow on survival of brown trout (Salmo trutta L.) in a chalkstream

Solomon, David; Paterson, Donald

doi:10.1007/bf00005191

Cited by 28 publications

(24 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Levels of trout abundance, in particular, are linked to hydrological events (Allen, 1951;Solomon and Paterson, 1980;Bovee, 1988;Jowett and Richardson, 1989;Nehring and Anderson, 1993;Jensen and Johnsen, 1999;Spina, 2001) and to physical habitat conditions (Souchon et al, 1989;Jowett, 1992;Baran, 1995).…”

Section: Factors That Can Explain Population Fluctuationsmentioning

confidence: 98%

Long‐term simulations of the dynamics of trout populations on river reaches bypassed by hydroelectric installations—analysis of the impact of different hydrological scenarios

Gouraud¹,

Capra²,

Sabaton³

et al. 2008

River Research & Apps

View full text Add to dashboard Cite

Changes in a brown trout (Salmo trutta L.) population result from interaction among various mechanisms which are dependent on environmental conditions and biotic processes. In reaches influenced by the presence of dams, the instream flow in the bypassed section is not the only parameter which affects the population. Flood episodes, the general connectivity of the bypassed section, and the characteristics of the substrate which define the availability and quality of spawning grounds may also have a crucial impact. The design and fine-tuning of tools which take environmental parameters into account can improve our understanding of the dynamics of such influenced populations. In this perspective, a deterministic model (MODYPOP) has been developed in an attempt to integrate all these factors and to test the effect of different long-term scenarios of influenced flow regimes on the structure of trout populations. MODYPOP was applied to three populations and three reaches (on the Roizonne, Neste d'Aure and Lignon du Forez rivers in France). For each stream, experiments were carried out on a bypassed section downstream of a hydropower station, before and after an increase in the minimum instream flow due to relicensing. These experiments allowed integrating into MODYPOP local phenomena (impact of flood episodes, impact of flushing, impact of downstream migration of juveniles and adults) affecting the populations during the study period and then calibrating them. To estimate the change in the population due to the increase in minimum instream flow, different long-term simulations were run, selecting discharge patterns at random. These scenarios help to evaluate the time required for the population to return to a range close to habitat saturation after an improvement in the hydraulic habitat or following a flood event. These applications have enabled determining the relative importance of changes in population density due to different types of events.

show abstract

Section: Factors That Can Explain Population Fluctuationsmentioning

confidence: 98%

Long‐term simulations of the dynamics of trout populations on river reaches bypassed by hydroelectric installations—analysis of the impact of different hydrological scenarios

Gouraud¹,

Capra²,

Sabaton³

et al. 2008

River Research & Apps

View full text Add to dashboard Cite

show abstract

“…Thus, annual recruitment magnitudes would be reflected in the age structure of the population (Fogarty et al 1991;Doherty and Fowler 1994;Caley et al 1996). Moreover, functional links between recruitment and hydrological factors have been described for a variety of stream-living populations of brown trout (Solomon and Paterson 1980;Jensen and Johnsen 1999;Spina 2001) and other salmonids (Clark 1992;Nehring and Anderson 1993;Latterell et al 1998). The spatiotemporal scales under which suites of factors predominate have yet to be identified.…”

Section: Introductionmentioning

confidence: 96%

“…a variety of populations across the European range of brown trout including streams in the United Kingdom (Solomon and Paterson 1980;Milner et al 1993;Elliott et al 1997), in northern and boreal latitudes (Jensen and Johnsen 1999;Mäki-Petäys et al 1999), and in southern Mediterranean latitudes (Cattanéo et al 2002(Cattanéo et al , 2003. Similarly, numerous introduced populations across geographical (climatic) North American regions appear to be constrained by discharge variations, including Michigan (Nuhfer et al 1994), Montana (Nelson 1986), Minnesota (Newman and Waters 1989), Colorado (Nehring and Anderson 1993;Latterell et al 1998), and California (Strange et al 1992).…”

mentioning

confidence: 91%

Discharge-dependent covariation patterns in the population dynamics of brown trout (Salmo trutta) within a Cantabrian river drainage

Lobón‐Cerviá¹

2004

Can. J. Fish. Aquat. Sci.

View full text Add to dashboard Cite

Patterns of spatial covariation in the population dynamics of brown trout (Salmo trutta) across Rio Esva (northwestern Spain) were explored by using the residuals from stock-recruitment relationships as indices of survival rates of spawner-to-recruit (STR), spawner-to-cohort size (STC), and spawner-to-spawner (STS). Positive correlations in pairwise comparisons among survival rates together with highly significant spatiotemporal variation in STC (74.3%) and STS (51.5%) explained by variation in STR provided evidence for persistent spatial covariation across the river drainage during the whole lifetime. Split-line regressions fitted to the survival rates versus river discharge in March (when trout emerge) highlighted the importance of discharge during, or just after, trout emergence as a major determinant of recruitment whose effects are reflected in the population over the lifetime and emphasized the synchrony between environmental processes and brown trout dynamics. Synchrony in recruitment is caused by hydrological synchrony that, in turn, is determined by climatic synchrony (rainfall) operating at the regional scale. The importance of discharge for recruitment is consistent with studies on native and introduced populations, suggesting its broad effect on the dynamics of stream brown trout across geographical regions.Résumé : L'analyse des résidus des relations stock-recrutement comme indices de la survie des reproducteurs aux recrues (STR), de la survie des reproducteurs à la taille de la cohorte (STC) et de la survie des reproducteurs aux reproducteurs (STS) a permis d'explorer la structure de la covariation spatiale de la dynamique de population de la truite brune (Salmo trutta) dans le Rio Esva du nord-ouest de l'Espagne. Les corrélations positives dans les comparaisons appariées des taux de survie, ainsi que la variation spatio-temporelle très significative de STC (74,3 %) et de STS (51,5 %) qui s'explique par la variation de STR, sont des indices d'une covariation spatiale persistante au sein du bassin versant durant le cycle entier. Des régressions linéaires fragmentées ajustées aux taux de survie en fonction du débit de la rivière en mars (lors de l'émergence des truites) montrent l'importance du débit durant l'émergence des truites ou juste après l'émergence comme un facteur déterminant majeur du recrutement, dont les effets se répercutent durant la vie entière et mettent en lumière la synchronie entre les processus environnementaux et la dynamique de la truite brune. La synchronie du recrutement est causée par une synchronie hydrologique qui, à son tour, est déterminée par une synchronie climatique (précipitations) qui agit à l'échelle régionale. L'importance du débit pour le recrutement est confirmée par des études sur des populations indigènes et introduites, ce qui laisse croire que le débit a un effet étendu sur la dynamique de la truite brune des cours d'eau dans plusieurs régions géographiques.

show abstract

“…However, some studies have shown that hydrological variability is also of major importance in determining juvenile density in temperate regions. For instance, functional links between recruitment and hydrological factors have been described for some brown trout populations (e.g., Solomon and Paterson 1980;Jensen and Johnsen 1999;Lobón-Cerviá 2004;Lobón-Cerviá and Rincón 2004). Nowadays, it is widely recognized that the impact of hydrological events does not depend only on their magnitude, but also on their timing and the life stage involved.…”

Section: Introductionmentioning

confidence: 97%

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

2009

View full text Add to dashboard Cite

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.

show abstract

Influence of natural and regulated streamflow on survival of brown trout (Salmo trutta L.) in a chalkstream

Cited by 28 publications

References 3 publications

Long‐term simulations of the dynamics of trout populations on river reaches bypassed by hydroelectric installations—analysis of the impact of different hydrological scenarios

Long‐term simulations of the dynamics of trout populations on river reaches bypassed by hydroelectric installations—analysis of the impact of different hydrological scenarios

Discharge-dependent covariation patterns in the population dynamics of brown trout (Salmo trutta) within a Cantabrian river drainage

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

Contact Info

Product

Resources

About