ASSESSING THE CUMULATIVE IMPACTS OF HYDROPOWER REGULATION ON THE FLOW CHARACTERISTICS OF A LARGE ATLANTIC SALMON RIVER SYSTEM

2013 ◽  
Vol 30 (4) ◽  
pp. 456-475 ◽  
Author(s):  
C. Birkel ◽  
C. Soulsby ◽  
G. Ali ◽  
D. Tetzlaff
Keyword(s):  
Atlantic Salmon ◽  
Flow Characteristics ◽  
River System ◽  
Cumulative Impacts ◽  
Salmon River

scholarly journals Molecular pedigree reconstruction and estimation of evolutionary parameters in a wild Atlantic salmon river system with incomplete sampling: a power analysis

2014 ◽  
Vol 14 (1) ◽  
pp. 68 ◽  
Author(s):  
Tutku Aykanat ◽  
Susan E Johnston ◽  
Deirdre Cotter ◽  
Thomas F Cross ◽  
Russell Poole ◽  
...  
Keyword(s):  
Atlantic Salmon ◽  
Power Analysis ◽  
River System ◽  
Pedigree Reconstruction ◽  
Salmon River ◽  
Incomplete Sampling

Genetic, Environmental, and Maturational Effects on Atlantic Salmon (Salmo salar) Survival in Acute Low pH Trials

1986 ◽  
Vol 43 (8) ◽  
pp. 1547-1555 ◽  
Author(s):  
C. B. Schom
Keyword(s):  
Atlantic Salmon ◽  
Survival Time ◽  
Salmo Salar ◽  
Dominant Gene ◽  
Low Ph ◽  
Research Centre ◽  
First Year ◽  
Significant Component ◽  
Salmon River ◽  
Mature Parr

Wild sea-run anadromous salmon (Salmo salar) were captured in Big Salmon River in New Brunswick and transported to the Atlantic Salmon Federation's research centre for spawning. Four year-classes were established, one each in 1980, 1981, 1982, and 1983, using a nested design, i.e. one female with one anadromous male and one or two mature parr. The mature parr, in all but the first year, were from families identified as to survival time in acute low pH trials. Resistance to low pH, i.e. survival time, was family specific and independent of the trial conditions. The heritabilities had dominant and additive components with, however, the apparent larger dam than sire effect an artifact of the experimental design. The most significant component appeared to be the dominant gene component. The mature parr were more resistant than the nonmature parr. Finally, genetic gains from selection were much greater in the down direction than the up direction, and this appeared to be a consequence of negative hatchery selection.

Kidney Disease in Juvenile Atlantic Salmon (Salmo salar) in the Margaree River

1969 ◽  
Vol 26 (9) ◽  
pp. 2535-2537 ◽  
Author(s):  
J. H. C. Pippy
Keyword(s):  
Kidney Disease ◽  
Atlantic Salmon ◽  
Salmo Salar ◽  
River System ◽  
Juvenile Salmon ◽  
Wild Salmon ◽  
Atlantic Salmon Salmo Salar ◽  
Bacterial Kidney Disease ◽  
Juvenile Atlantic Salmon

Bacterial kidney disease was presumptively identified in each of 25 hatchery-reared juvenile salmon (Salmo salar) but in only 2 of 235 wild juveniles in the Margaree River system. Apparently spread of disease from the hatchery to wild salmon in the river is very gradual.

scholarly journals Assessing demographic effects of dams on diadromous fish: a case study for Atlantic salmon in the Penobscot River, Maine

2015 ◽  
Vol 72 (8) ◽  
pp. 2423-2437 ◽  
Author(s):  
Julie L. Nieland ◽  
Timothy F. Sheehan ◽  
Rory Saunders
Keyword(s):  
Atlantic Salmon ◽  
Performance Metrics ◽  
Survival Rates ◽  
Population Viability Analysis ◽  
River System ◽  
Diadromous Fish ◽  
Viability Analysis ◽  
Penobscot River ◽  
Passage Efficiency ◽  
Demographic Effects

Abstract Dams are a major contributor to the historic decline and current low abundance of diadromous fish. We developed a population viability analysis to assess demographic effects of dams on diadromous fish within a river system and demonstrated an application of the model with Atlantic salmon in the Penobscot River, Maine. We used abundance and distribution of wild- and hatchery-origin adult salmon throughout the watershed as performance metrics. Salmon abundance, distribution to upper reaches of the Penobscot watershed, and the number and proportion of wild-origin fish in the upper reaches of the Penobscot watershed increased when dams, particularly mainstem dams, were removed or passage efficiency was increased. Salmon abundance decreased as indirect latent mortality per dam was increased. Salmon abundance increased as marine or freshwater survival rates were increased, but the increase in abundance was larger when marine survival was increased than when freshwater survival was increased. Without hatchery supplementation, salmon abundance equalled zero with low marine and freshwater survival but increased when marine and freshwater survival rates were increased. Models, such as this one, that incorporate biological, environmental, and functional parameters can be used to predict ecological responses of fish populations and can help evaluate and prioritize management and restoration actions for diadromous fish.

Relationship of upstream migrating adult Atlantic salmon (Salmo salar) and stream discharge within Catamaran Brook, New Brunswick

2007 ◽  
Vol 64 (3) ◽  
pp. 563-573 ◽  
Author(s):  
Sean C Mitchell ◽  
Richard A Cunjak
Keyword(s):  
Body Size ◽  
Atlantic Salmon ◽  
New Brunswick ◽  
Salmo Salar ◽  
Predictive Ability ◽  
River System ◽  
Low Flow ◽  
Stream Discharge ◽  
Atlantic Salmon Salmo Salar ◽  
Adult Abundance

Stream discharge has long been associated with abundance of returning adult spawning salmonids to streams and may also affect body size distribution of adult salmon as low flows interfere with returns of larger-bodied fish. We examined these relationships of abundance and body size within Catamaran Brook, a third-order tributary to the Miramichi River system of New Brunswick, Canada, to investigate the causes of a declining trend in annual returns of Atlantic salmon (Salmo salar) to this stream. Regression models of adult abundance, proportion of the run as grilse, and body size of returning adults as functions of maximum daily stream discharge during the period of upstream spawner migration were constructed. Adult abundance shows a logarithmic relationship with stream discharge and provides good predictive ability, while appearing to not be significantly related to adult abundance in the larger Miramichi system. The proportion as grilse in the run and female body size are also logarithmically related to stream discharge, with low flow years being very influential in the regressions. These relationships of Atlantic salmon population abundance and body size characteristics have implications with respect to stock integrity and production of the following generation.

scholarly journals Effects of land use and water quality on greenhouse gas emissions from an urban river system

2020 ◽  
Author(s):  
Long Ho ◽  
Ruben Jerves-Cobo ◽  
Matti Barthel ◽  
Johan Six ◽  
Samuel Bode ◽  
...  
Keyword(s):  
Water Quality ◽  
Land Use ◽  
Urban Areas ◽  
Anthropogenic Activities ◽  
Ghg Emissions ◽  
Flow Characteristics ◽  
River System ◽  
Urban River ◽  
Polluted Water ◽  
Land Use Types

Abstract. Rivers act as a natural source of greenhouse gases (GHGs) that can be released from the metabolisms of aquatic organisms. Anthropogenic activities can largely alter the chemical composition and microbial communities of rivers, consequently affecting their GHG emissions. To investigate these impacts, we assessed the emissions of CO2, CH4, and N2O from Cuenca urban river system (Ecuador). High variation of the emissions was found among river tributaries that mainly depended on water quality and neighboring landscapes. By using Prati and Oregon Indexes, a clear pattern was observed between water quality and GHG emissions in which the more polluted the sites were, the higher were their emissions. When river water quality deteriorated from acceptable to very heavily polluted, their global warming potential (GWP) increased by ten times. Compared to the average estimated emissions from global streams, rivers with polluted water released almost double the estimated GWP while the proportion increased to ten times for very heavily polluted rivers. Conversely, the GWP of good-water-quality rivers was half of the estimated GWP. Furthermore, surrounding land-use types, i.e. urban, roads, and agriculture, significantly affected the river emissions. The GWP of the sites close to urban areas was four time higher than the GWP of the nature sites while this proportion for the sites close to roads or agricultural areas was triple and double, respectively. Lastly, by applying random forests, we identified dissolved oxygen, ammonium, and flow characteristics as the main important factors to the emissions. Conversely, low impact of organic matter and nitrate concentration suggested a higher role of nitrification than denitrification in producing N2O. These results highlighted the impacts of land-use types on the river emissions via water contamination by sewage discharges and surface runoff. Hence, to estimate of the emissions from global streams, both their quantity and water quality should be included.

Juvenile production variation in salmonids: population dynamics, habitat, and the role of spatial relationships

1998 ◽  
Vol 55 (S1) ◽  
pp. 191-200 ◽  
Author(s):  
John F Kocik ◽  
C Paola Ferreri
Keyword(s):  
Life History ◽  
Atlantic Salmon ◽  
Spatial Ecology ◽  
Spatial Scales ◽  
River System ◽  
Habitat Characteristics ◽  
Life History Stage ◽  
Growth And Survival ◽  
Juvenile Atlantic Salmon ◽  
Spatial Positioning

Anadromous Atlantic salmon (Salmo salar) exhibit a complex life history that requires the use of habitats that span several different temporal and spatial scales. While fisheries scientists have investigated the various elements of habitat and how they affect Atlantic salmon growth and survival, these studies typically focus on requisite requirements for a single life history stage. Current advances in our understanding of salmonid populations in lotic systems indicates that ignoring the spatial positioning of different habitats and dispersal capabilities of fish between them may affect estimates of habitat quality and production of juvenile Atlantic salmon. Using the concepts of juxtaposition and interspersion, we hypothesize that discrete functional habitat units (FHU) occur within river systems and that the spatial structure of FHU affects fish production. We present a method to delineate FHU using habitat maps, fish ecology, and spatial habitat characteristics. Utilizing a simulation model, we illustrate how modeling FHU structure of spawning and rearing habitat in a river system can improve our understanding of juvenile Atlantic salmon production dynamics. The FHU concept allows a flexible approach to more comprehensive analyses of the impacts of habitat alterations, seasonal habitat shifts, and spatial ecology of salmonids at various scales.

Temporal Variation of Meristic Traits within an Atlantic Salmon (Salmo salar) Stock, and Implications for Stock Identification

1988 ◽  
Vol 45 (8) ◽  
pp. 1330-1339 ◽  
Author(s):  
D. M. Blouw ◽  
S. D. Saxon ◽  
E. M. P. Chadwick
Keyword(s):  
Atlantic Salmon ◽  
Temporal Variation ◽  
Salmo Salar ◽  
Null Hypothesis ◽  
Temporal Stability ◽  
River System ◽  
Stock Identification ◽  
Atlantic Salmon Salmo Salar ◽  
Group Variation ◽  
Made In

The assumption is generally made in stock identification studies that variation within stocks is not confounded with variation among them. To evaluate whether this assumption is tenable we test the null hypothesis of temporal stability in five key meristic traits of a single stock of Atlantic salmon (Salmo salar). We used smolts collected over a 10-yr period in the downstream migrations from one small river system. Individuals were tagged when captured and preserved, so we can estimate variability within, as well as among, runs. The meristic traits are remarkably homogenous within runs and cohorts. However, the null hypothesis of stability over time among runs and cohorts is strongly rejected for each trait. We conclude that temporal variation is both extensive and persistent. There is limited covariation among the traits, but they are largely independent of scores of environmental variables and of variation in the biological attributes of the stock. Because among-group variability is meaningful only in context of within-group variation, and because the within-group variation is large, our results have serious implications for sampling design in stock identification studies.

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