The relation between redd counts and Atlantic salmon (<i>Salmo salar</i>) parr populations in the Dennys River, Maine

Beland, Kenneth F.

doi:10.1139/f95-216

Cited by 30 publications

(28 citation statements)

References 17 publications

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“…Whereas some O. mykiss may migrate long distances in freshwater (Tattam 2006), there is no evidence available to suggest the <2 year old juveniles used in this study would do so (see also Kahler et al 2001). Juvenile density is correlated to redd density in both S. salar (Beland 1996) and S. trutta (Beard and Carline 1991), indicating limited movement from natal areas is a reasonable assumption. During the summer juveniles may move frequently within a stream reach, but they are unlikely to move more than a few hundred meters (Kahler et al 2001).…”

Section: Maternal Life Historymentioning

confidence: 79%

Variability in expression of anadromy by female Oncorhynchus mykiss within a river network

et al. 2011

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We described and predicted spatial variation in marine migration (anadromy) of female Oncorhynchus mykiss in the John Day River watershed, Oregon. We collected 149 juvenile O. mykiss across 72 sites and identified locations used by anadromous females by assigning maternal origin (anadromous versus non-anadromous) to each juvenile. These assignments used comparisons of strontium to calcium ratios in otolith primordia and freshwater growth regions to indicate maternal origin.We used logistic regression to predict probability of anadromy in relation to mean annual stream runoff using data from a subset of individuals. This model correctly predicted anadromy in a second sample of individuals with a moderate level of accuracy (e.g., 68% correctly predicted with a 0.5 classification threshold). Residuals from the models were not spatially autocorrelated, suggesting that remaining variability in the expression of anadromy was due to localized influences, as opposed to broad-scale gradients unrelated to mean annual stream runoff. These results are important for the management of O. mykiss because anadromous individuals (steelhead) within the John Day River watershed are listed as a threatened species, and it is difficult to discern juvenile steelhead from non-anadromous individuals (rainbow trout) in the field. Our results provide a broadscale description and prediction of locations supporting anadromy, and new insight for habitat restoration, monitoring, and research to better manage and understand the expression of anadromy in O. mykiss.

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Section: Maternal Life Historymentioning

confidence: 79%

Variability in expression of anadromy by female Oncorhynchus mykiss within a river network

et al. 2011

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“…: +81-11-706-2251; fax: +81-11-706-4867; email: edo@ees.hokudai.ac.jp considered to be the core. For example, significant correlations between redd counts and number of spawners or parr have been reported in some salmonid species (Hobbs, 1937;Benson, 1953;Heggberget et al, 1986;Beard & Carline, 1991;Madden et al, 1993;Semple et al, 1994;Beland, 1996; but see Ottaway et al, 1981).…”

Section: Introductionmentioning

confidence: 98%

“…In particular, the number of spawners and subsequent recruits are the most important numerical information (Beland, 1996), and, in the stock-recruitment relationships, redds are ‡Author to whom correspondence should be addressed. Tel.…”

Section: Introductionmentioning

confidence: 99%

The structure and dimensions of redds and egg pockets of the endangered salmonid, Sakhalin taimen

Edo

Kawamula²,

Higashi

2000

Journal of Fish Biology

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Each redd of the Sakhalin taimen Hucho perryi had a V-shaped pot that is specific to this species. The shape of each multiple-egg-pocket redd was a combination of one-egg-pocket redds, and the number of egg pockets in the redd could be estimated from the shape. False redds were small and did not have any V-shaped pots. The factors affecting redd size were examined numerically; consequently, numbers of egg pockets and eggs and female fork length were correlated significantly with tail length. Each egg pocket contained 11-920 eggs (mean: 546·7 95% CL 81·9) and the egg pocket depth was correlated significantly with female fork length. Mean number of redds per female was three, and the number of females could be estimated as one third of the redds. 2000 The Fisheries Society of the British Isles

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“…To better understand this potential bias requires further work. In the meantime, we hold some confidence in the accuracy of the redd survey data because it is often significantly correlated with spawner abundances (Beland, 1996;Dunham et al, 2001;Gallagher & Gallagher, 2005).…”

Section: Discussionmentioning

confidence: 83%

The effects of flow on Atlantic salmon (Salmo salar) redd distribution in a UK chalk stream between 1980 and 2015

Parry

Gregory

Lauridsen

et al. 2017

Ecology of Freshwater Fish

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Atlantic salmon are an ecologically and economically important migratory fish in the UK, whose stocks have been declining over the past 30 years. Future climate and water use changes have the potential to alter the reproductive behaviour and distribution of salmon within a river, by restricting times and ability to access suitable spawning areas. As the survival of emergent salmon juveniles is density dependent, understanding how climate‐driven changes in flow affect the location of salmon redds is important for future conservation efforts. This study examined how flow conditions affect the distribution of redds within a UK chalk stream, the river Frome in Dorset. Sixteen years of redd distribution and flow data between 1980 and 2015 were analysed using linear mixed‐effects modelling. Generally, highest redd densities occurred within middle reaches of the main river. Mean flow during the river Frome critical migration period (October–December) did not affect the density of redds directly but affected the relationship between redd density and distance from tidal limit: redd densities were spread more uniformly throughout the river under high flow conditions, whereas redds were more aggregated in the middle river reaches under low flow conditions. Together, these findings suggest that access to upstream spawning grounds was limited under low flow conditions, which could have negative repercussions on juvenile survival. This study has revealed the distribution of redds along the river Frome for the first time and provided a basis for further study into the effects of redd distribution on subsequent juvenile life stages.

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The relation between redd counts and Atlantic salmon (Salmo salar) parr populations in the Dennys River, Maine

Cited by 30 publications

References 17 publications

Variability in expression of anadromy by female Oncorhynchus mykiss within a river network

Variability in expression of anadromy by female Oncorhynchus mykiss within a river network

The structure and dimensions of redds and egg pockets of the endangered salmonid, Sakhalin taimen

The effects of flow on Atlantic salmon (Salmo salar) redd distribution in a UK chalk stream between 1980 and 2015

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