Dispersal patterns and survival of Atlantic salmon (Salmo salar L.) juveniles in a nursery stream

Beall, Edward

doi:10.1006/jmsc.1994.1001

Cited by 65 publications

(62 citation statements)

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“…Kennedy (1982) obtained similar results and noted that over 70% of the survivors were within 100 m downstream of the stocking point. In contrast, Beall et al ., (1994) observed that in October of their first year some pan had dispersed over 2000 m downstream of the release point and a substantial number had moved downstream by between 1000 and 1500 m . Kalleberg (1958) noted that newly-emerged salmon had territories of 0 .02 to 0.03 m2 , whereas larger pan and smolts had territories of > 1 m2 .…”

Section: Water Depth and Velocitymentioning

confidence: 70%

Environmental requirements of common riverine European salmonid fish species in fresh water with particular reference to physical and chemical aspects

Crisp¹

1996

Hydrobiologia

115

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This review attempts to assess, as quantitatively as possible, the habitat requirements in fresh water of three common and widespread European salmonid species . Namely : the trout (Salmo trutta L .), the salmon (S. salar L .) and the grayling (Thymallus thymallus L .) . Requirements are considered for spawning, incubation and emergence, juveniles and smolts and for adults and spawning movements .

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Section: Water Depth and Velocitymentioning

confidence: 70%

Environmental requirements of common riverine European salmonid fish species in fresh water with particular reference to physical and chemical aspects

Crisp¹

1996

Hydrobiologia

115

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“…The three release sites within each stream were generally separated by >1 km (two pairs were approx. 800 m apart) to limit the movement of salmon among sites within the Wrst summer (Beall et al 1994;Einum and Nislow 2005). Salmon dispersal was limited such that density declined with distance from the release site and there were clear gaps in distribution between sites (see sampling methods).…”

Section: Methodsmentioning

confidence: 99%

Predators reverse the direction of density dependence for juvenile salmon mortality

Ward¹,

Nislow²,

Folt³

2008

Oecologia

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The effect of predators on prey populations depends on how predator-caused mortality changes with prey population density. Predators can enforce density-dependent prey mortality and contribute to population stability, but only if they have a positive numerical or behavioral response to increased prey density. Otherwise, predator saturation can result in inversely density-dependent mortality, destabilizing prey populations and increasing extinction risk. Juvenile salmon and trout provide some of the clearest empirical examples of density-dependent mortality in animal populations. However, although juvenile salmon are very vulnerable to predators, the demographic effects of predators on juvenile salmon are unknown. We tested the interactive effects of predators and population density on the mortality of juvenile Atlantic salmon (Salmo salar) using controlled releases of salmon in natural streams. We introduced newly hatched juvenile salmon at three population density treatments in six study streams, half of which contained slimy sculpin (Cottus cognatus), a common generalist predator (18 release sites in total, repeated over two summers). Sculpin reversed the direction of density dependence for juvenile salmon mortality. Salmon mortality was density dependent in streams with no sculpin, but inversely density dependent in streams where sculpin were abundant. Such predator-mediated inverse density dependence is especially problematic for prey populations suppressed by other factors, thereby presenting a fundamental challenge to persistence of rare populations and restoration of extirpated populations.

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“…Chez les salmonidés, la dévalaison constitue un élément clé de la régulation des populations dans le milieu naturel (HELAND, 1991), que les « dévalants » soient considérés comme perdus (ELLIOTT, 1987) ou susceptibles de coloniser les secteurs aval (BEALL et al, 1994). Au cours de notre étude, nous n'avons enregistré aucune dérive pendant les essais correspondant à une situation naturelle (essais sur débits de base de 150 et 250 l/s).…”

Section: Discussionunclassified

Influence du débit de base et de la durée des éclusées sur la dérive d'alevins de truite commune : expérimentations en canal semi-naturel

Liebig

Lim

Belaud

1998

Bull. Fr. Pêche Piscic.

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Dispersal patterns and survival of Atlantic salmon (Salmo salar L.) juveniles in a nursery stream

Cited by 65 publications

References 0 publications

Environmental requirements of common riverine European salmonid fish species in fresh water with particular reference to physical and chemical aspects

Environmental requirements of common riverine European salmonid fish species in fresh water with particular reference to physical and chemical aspects

Predators reverse the direction of density dependence for juvenile salmon mortality

Influence du débit de base et de la durée des éclusées sur la dérive d'alevins de truite commune : expérimentations en canal semi-naturel

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