Comparison of parasite fauna of juvenile sockeye salmon (Oncorhynchus nerka) from southern British Columbian and Washington State lakes

1987 ◽  
Vol 65 (2) ◽  
pp. 420-431 ◽  
Author(s):  
R. E. Bailey ◽  
L. Margolis
Keyword(s):  
Sockeye Salmon ◽  
Trophic Status ◽  
Oncorhynchus Nerka ◽  
Parasite Fauna ◽  
Washington State ◽  
Nearest Neighbour ◽  
Cluster Analyses ◽  
Modes Of Transmission ◽  
Lake Washington ◽  
Neighbour Analysis

Sixteen species and juveniles of four taxa of parasites (Myxosporea, 4; Monogenea, 1; Trematoda, 5; Cestoda, 4; Nematoda, 2; Acanthocephala, 2; Copepoda, 2) were encountered in 1550 sockeye salmon (Oncorhynchus nerka) smolts and presmolts examined from 15 Fraser River lakes, Nimpkish Lake on Vancouver Island, and Lake Washington, Washington State, U.S.A. The most common taxa were Diphyllobothrium sp. (spp.?) plerocercoids, Philonema agubernaculum, Eubothrium sp., and Proteocephalus sp. Various statistical techniques (K - nearest neighbour and cluster analyses based on Jaccard and percent dissimilarity matrices) were used to compare the parasite fauna in sockeye from the different lakes. K - nearest neighbour analysis demonstrated that considerable overlap existed among many of the studied lakes, whereas little overlap occurred among other lakes. Cluster analyses revealed similar faunas among some lakes within biogeoclimatic zones and lakes of similar trophic status. Cluster analyses also revealed parasites that tended to co-occur. Parasites with similar modes of transmission or geographic range tended to cluster together.

An Acoustic Estimate of the Escapement of Sockeye Salmon (Oncorhynchus nerka) into Lake Washington in 1971

1974 ◽  
Vol 31 (2) ◽  
pp. 222-225 ◽  
Author(s):  
Richard E. Thorne ◽  
James J. Dawson
Keyword(s):  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
Spawning Migration ◽  
Spawning Ground ◽  
Large Fish ◽  
Before And After ◽  
Lake Washington

The feasibility of estimating the escapement of sockeye salmon (Oncorhynchus nerka) into Lake Washington by hydroacoustics was explored during 1971. Surveys were made of large fish targets within the lake just before and after the spawning migration of sockeye salmon up the Cedar River. A decrease was observed after the spawning migration comparable to the estimated escapement as determined by weir counts and spawning ground surveys.

Estimating Stock Composition of Migrating Juvenile Fraser River (British Columbia) Sockeye Salmon, Oncorhynchus nerka, Using Parasites as Natural Tags

1988 ◽  
Vol 45 (4) ◽  
pp. 586-591 ◽  
Author(s):  
R. E. Bailey ◽  
L. Margolis ◽  
C. Groot
Keyword(s):  
British Columbia ◽  
Maximum Likelihood ◽  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
Fraser River ◽  
Dominant Group ◽  
Strait Of Georgia ◽  
Natural Tags ◽  
Lake Washington ◽  
The Individual

Simulated mixtures of juvenile sockeye salmon (Oncorhynchus nerka) were constructed using parasite data to represent proportionally the major component stocks of Fraser River and Lake Washington sockeye migrating within the Strait of Georgia, British Columbia, in 1982–84. Samples of migrating juveniles were also collected from Bedwell Harbour, South Pender Island, British Columbia, each year and analyzed for parasites and stock composition. The compositions of simulated and sample mixtures were estimated using a maximum likelihood stock composition model. Simulated mixture compositions were accurately estimated for most stocks for all year-classes. When significant misassignment occurred between stocks, the stocks were analyzed as a complex using the allocate-sum procedure. Sample mixture estimates correctly identified the dominant stock for each year-class, although for 1984 the dominant group was determined as a complex of three stocks because the individual stocks were not distinguishable. The results indicate that it is feasible to use parasites as natural tags to estimate stock compositions of migrating juvenile sockeye salmon in the Strait of Georgia.

Evidence for the existence of a native population of sockeye salmon (Oncorhynchus nerka) and subsequent introgression with introduced populations in a Pacific Northwest watershed

2007 ◽  
Vol 64 (9) ◽  
pp. 1209-1221 ◽  
Author(s):  
Ingrid B Spies ◽  
Eric C Anderson ◽  
Kerry Naish ◽  
Paul Bentzen
Keyword(s):  
Pacific Northwest ◽  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
Past Century ◽  
The Past ◽  
Introduced Populations ◽  
Microsatellite Dna Markers ◽  
Lake Washington ◽  
Baker Lake ◽  
Bear Creek

The Lake Washington watershed (Washington, USA) has been the recipient of numerous transplantations of nonnative Oncorhynchus nerka (both sockeye salmon and their landlocked form, kokanee) over the past century and currently contains self-sustaining populations of both ecotypes. Microsatellite DNA markers were used to identify native and introduced groups while characterizing population structure. This study confirmed that Baker Lake sockeye transplantations during the 20th century contributed to three current sockeye populations: Cedar River, Issaquah Creek, and Pleasure Point Beach in the Lake Washington watershed. Distinctive allele distributions at two loci, One101 and One114, provide evidence that a fourth Lake Washington sockeye population, Bear Creek, is divergent from other Lake Washington sockeye and may be of substantially native origin despite heavy stocking activity in the watershed over the past century. Data from these loci also suggest the presence of native genes in populations that had been regarded as entirely of introduced origin.

Recent sedimentary legacy of sockeye salmon (Oncorhynchus nerka) and climate change in an ultraoligotrophic, glacially turbid British Columbia nursery lake

2009 ◽  
Vol 66 (7) ◽  
pp. 1141-1152 ◽  
Author(s):  
Aaron C. Hill ◽  
Jack A. Stanford ◽  
Peter R. Leavitt
Keyword(s):  
British Columbia ◽  
Sockeye Salmon ◽  
Trophic Status ◽  
Oncorhynchus Nerka ◽  
Production Potential ◽  
Lake Trophic Status ◽  
Air Temperatures ◽  
High Sedimentation ◽  
Order Of Magnitude ◽  
Coastal British Columbia

Paleolimnological studies of sockeye salmon ( Oncorhynchus nerka ) nursery lakes have shown that lake trophic status is often regulated by climate and harvest via marine-derived nutrients (MDN) from adult spawners. However, these controls are not well understood for sockeye nursery lakes in coastal British Columbia, many of which are ultraoligotrophic and glacially turbid. We examined climate, sockeye population dynamics, and sedimentary indicators of lake algal production from 1958 to 2005 using a radioisotope-dated sediment core from Kitlope Lake, British Columbia. Despite high sedimentation rates (~4.7 mm·year–1), significant influence of terrestrial and aquatic organic matter from the main tributary, and the lowest mean (± standard deviation) δ15N (–0.28‰ ± 0.79‰; a proxy for MDN flux) yet reported from a sockeye nursery lake, sedimentary δ15N, C–N ratio, and fossil pigments were coherent with order-of-magnitude changes in sockeye escapements. Moreover, air temperatures were positively correlated with δ15N, indicating a climate influence counteracting declines of MDN import related to declining spawner returns. Despite elevated production potential, Kitlope Lake remains nutrient-limited with a declining sockeye population, and the productivity of this system would benefit from increased sockeye returns.

scholarly journals Sphaerospora elwhaiensis sp. n. (Myxosporea: Sphaerosporidae) from landlocked sockeye salmon Oncorhynchus nerka (Salmoniformes: Salmonidae) in Washington State, USA

2011 ◽  
Vol 58 (2) ◽  
pp. 87-94 ◽  
Author(s):  
Simon Jones ◽  
Ivan Fiala ◽  
Gina Prosperi-Porta ◽  
Marcia House ◽  
Sonia Mumford
Keyword(s):  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
Washington State

Hydroacoustic Estimates of Adult Sockeye Salmon (Oncorhynchus nerka) in Lake Washington, 1972–75

1979 ◽  
Vol 36 (9) ◽  
pp. 1145-1149 ◽  
Author(s):  
Richard E. Thorne
Keyword(s):  
Key Words ◽  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
Target Strength ◽  
Spawning Ground ◽  
Resident Fish ◽  
Lake Washington ◽  
Visual Observations

Hydroacoustic techniques were used on Lake Washington from 1972 to 1975 to estimate the potential escapement of sockeye salmon (Oncorhynchus nerka). Target strength measurements were used to establish a threshold which would separate the larger adult sockeye salmon from smaller resident fish. The acoustic estimates of escapement were very similar to those obtained from visual observations at the Hiram M. Chittenden ship canal locks, observations on the Cedar River, and spawning ground surveys. Key words: hydroacoustic, acoustic, methodology, sockeye salmon, escapement

Incubation temperature, developmental biology, and the divergence of sockeye salmon (Oncorhynchus nerka) within Lake Washington

1998 ◽  
Vol 55 (6) ◽  
pp. 1387-1394 ◽  
Author(s):  
Andrew P Hendry ◽  
Jay E Hensleigh ◽  
Reg R Reisenbichler
Keyword(s):  
Sockeye Salmon ◽  
Incubation Temperature ◽  
Oncorhynchus Nerka ◽  
Absolute Magnitude ◽  
Adaptive Divergence ◽  
Evolutionary Divergence ◽  
Developmental Variation ◽  
Development Rates ◽  
Lake Washington ◽  
In The Wild

Sockeye salmon (Oncorhynchus nerka) introduced into Lake Washington in the 1930s and 1940s now spawn at several different sites and over a period of more than 3 months. To test for evolutionary divergence within this derived lineage, embryos that would have incubated in different habitats (Cedar River or Pleasure Point Beach) or at different times (October, November, or December in the Cedar River) were reared in the laboratory at 5, 9, and 12.5°C. Some developmental variation mirrored predictions of adaptive divergence: (i) survival at 12.5°C was highest for embryos most likely to experience such temperatures in the wild (Early Cedar), (ii) development rate was fastest for progeny of late spawners (Late Cedar), and (iii) yolk conversion efficiency was matched to natural incubation temperatures. These patterns likely had a genetic basis because they were observed in a common environment and could not be attributed to differences in egg size. The absolute magnitude of divergence in development rates was moderate (Late Cedar embryos emerged only 6 days earlier at 9°C) and some predictions regarding development rates were not supported. Nonetheless our results provide evidence of adaptive divergence in only 9-14 generations.

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