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  • 1
    Online Resource
    Online Resource
    Natural otolith microstructure patterns reveal precise homing to natal incubation sites by sockeye salmon (〈i〉Oncorhynchus nerka〈/i〉)
    Canadian Science Publishing ; 1999
    In:  Canadian Journal of Zoology Vol. 77, No. 5 ( 1999), p. 766-775
    Details
    In: Canadian Journal of Zoology, Canadian Science Publishing, Vol. 77, No. 5 ( 1999), p. 766-775
    Type of Medium: Online Resource
    ISSN: 1480-3283 , 0008-4301
    URL: Article
    DOI: 10.1139/cjz-77-5-766
    RVK:
    WA 15000
    Language: Unknown
    Publisher: Canadian Science Publishing
    Publication Date: 1999
    detail.hit.zdb_id: 1490831-1
    SSG: 12
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  • 2
    Online Resource
    Online Resource
    Spatial and temporal isolating mechanisms: the formation of discrete breeding aggregations of sockeye salmon ( Oncorhynchus nerka )
    Canadian Science Publishing ; 1995
    In:  Canadian Journal of Zoology Vol. 73, No. 2 ( 1995-02-01), p. 339-352
    Details
    In: Canadian Journal of Zoology, Canadian Science Publishing, Vol. 73, No. 2 ( 1995-02-01), p. 339-352
    Abstract: This study examined the spatial and temporal isolation of breeding aggregations of sockeye salmon (Oncorhynchus nerka) along a single island beach in Iliamna Lake, Alaska. The density and spatial extent of these aggregations varied among years, but one of the sites (Fuel Dump Point) was consistently separated from another major spawning area (Fuel Dump Bay) by at least 15 m of unused but generally similar habitat. Females settled first at the Point and this site supported higher spawner densities than the adjacent Bay. Male breeding opportunity, estimated from operational sex ratios, was higher in the Bay soon after spawning commenced. However, few males moved from the Point into the Bay and all movement that occurred was late in the season, when breeding opportunities for males were very limited. The reproductive success of males that moved from the Bay to the Point was estimated to be 0.003% of the total reproductive success of all males at the Point. The reproductive success of males that moved from the Point to the Bay was estimated to be 3% of the total reproductive success of all males at the Bay. Thus, spatial and temporal variation in settling largely isolated the two spawning aggregations within a breeding season. We suggest that variation in habitat quality may interact with the heritability of spawning date, contributing to the formation of distinct breeding groups.
    Type of Medium: Online Resource
    ISSN: 0008-4301 , 1480-3283
    URL: Article
    DOI: 10.1139/z95-038
    RVK:
    WA 15000
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1995
    detail.hit.zdb_id: 1490831-1
    SSG: 12
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  • 3
    Online Resource
    Online Resource
    Natural otolith microstructure patterns reveal precise homing to natal incubation sites by sockeye salmon ( Oncorhynchus nerka )
    Canadian Science Publishing ; 1999
    In:  Canadian Journal of Zoology Vol. 77, No. 5 ( 1999-10-01), p. 766-775
    Details
    In: Canadian Journal of Zoology, Canadian Science Publishing, Vol. 77, No. 5 ( 1999-10-01), p. 766-775
    Abstract: Experimental results suggest that anadromous salmon and trout learn (imprint) the odors of their natal site just prior to or during seaward migration. In contrast, information on the life histories of several species and the genetic structure of populations indicate that they must imprint earlier in life, probably during incubation in the gravel or when they emerge as free-swimming fry. To test the hypothesis that sockeye salmon (Oncorhynchus nerka) home to their incubation-emergence sites (rather than just to the lake where they reared before migrating to sea), we took advantage of the natural variation in otolith microstructure caused by differences in thermal regimes during incubation. We collected otoliths from adult sockeye salmon that returned to discrete spawning areas in Iliamna Lake, Alaska, and Lake Washington, Washington, and, in blind trials, these were classified based on comparison with otoliths from juveniles from the same sites and using information on site-specific thermal regimes. Our analysis showed that the salmon were much more likely to return to their natal incubation site than would have occurred by chance. Estimated straying rates were about 0.1% from the Woody Island population to the Pedro Pond population in Iliamna Lake and about 1% from the Cedar River population to the Pleasure Point population in Lake Washington. The results were consistent with genetic evidence for fine-scale structure of salmon populations and with conservation based on spatial scales appropriate for the early life history of the fish.
    Type of Medium: Online Resource
    ISSN: 0008-4301 , 1480-3283
    URL: Article
    DOI: 10.1139/z99-028
    RVK:
    WA 15000
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1999
    detail.hit.zdb_id: 1490831-1
    SSG: 12
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  • 4
    Online Resource
    Online Resource
    Secondary sexual characters, energy use, senescence, and the cost of reproduction in sockeye salmon
    Canadian Science Publishing ; 1999
    In:  Canadian Journal of Zoology Vol. 77, No. 11 ( 1999-12-01), p. 1663-1675
    Details
    In: Canadian Journal of Zoology, Canadian Science Publishing, Vol. 77, No. 11 ( 1999-12-01), p. 1663-1675
    Abstract: Reproductive development and energy stores were characterized for sockeye salmon (Oncorhynchus nerka) maturing in the wild (Pick Creek, Bristol Bay, Alaska). Between freshwater entry and the start of spawning, ovaries increased in mass by 87.1% and secondary sexual characters increased in linear dimension by 13.0-47.4%. Between the start of spawning and death, secondary sexual characters decreased in relative size by 3.3-12.7%. Mass-specific somatic energy declined from freshwater entry (6.7% fat, 20.6% protein, 6.6 kJ·g -1 ) to the start of spawning (1.6% fat, 18.0% protein, 4.5 kJ·g -1 ) and finally to death (0.1% fat, 14.4% protein, 2.9 kJ·g -1 ). Stored fat appeared to be used primarily for upriver migration and egg production, whereas stored protein appeared to be used primarily for the development of secondary sexual characters and metabolism during spawning. Most development of secondary sexual characters occurred late in maturation, perhaps to forestall deterioration of muscle tissue. Relative to populations with long freshwater migrations, Bristol Bay sockeye salmon stored less fat before entering fresh water and used less fat before death. The total energy cost of reproduction (freshwater entry until death, including gonad investment) was 74.1% for females and 66.1% for males, higher than levels typically reported for iteroparous salmonids.
    Type of Medium: Online Resource
    ISSN: 0008-4301 , 1480-3283
    URL: Article
    DOI: 10.1139/z99-158
    RVK:
    WA 15000
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1999
    detail.hit.zdb_id: 1490831-1
    SSG: 12
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  • 5
    Online Resource
    Online Resource
    Horizon scan of conservation issues for inland waters in Canada
    Canadian Science Publishing ; 2020
    In:  Canadian Journal of Fisheries and Aquatic Sciences Vol. 77, No. 5 ( 2020-05), p. 869-881
    Details
    In: Canadian Journal of Fisheries and Aquatic Sciences, Canadian Science Publishing, Vol. 77, No. 5 ( 2020-05), p. 869-881
    Abstract: Horizon scanning is a systematic approach increasingly used to explore emerging trends, issues, opportunities, and threats in conservation. We present the results from one such exercise aimed at identifying emerging issues that could have important scientific, social, technological, and managerial implications for the conservation of inland waters in Canada in the proximate future. We recognized six opportunities and nine challenges, for which we provide research implications and policy options, such that scientists, policy makers, and the Canadian society as a whole can prepare for a potential growth in each of the topic areas we identified. The issues spanned a broad range of topics, from recognizing the opportunities and challenges of community-enabled science and the need to consider the legal rights of nature, to the likely increase of pharmaceuticals in wastewater due to an aging population. These issues represent a first baseline that could help decision makers identify and prioritize efforts while simultaneously stimulate new research avenues. We hope our horizon scan will pave the way for similar exercises related to the conservation of biodiversity in Canada.
    Type of Medium: Online Resource
    ISSN: 0706-652X , 1205-7533
    URL: Article
    DOI: 10.1139/cjfas-2019-0105
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 7966-2
    detail.hit.zdb_id: 1473089-3
    SSG: 21,3
    SSG: 12
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  • 6
    Online Resource
    Online Resource
    Ecological speciation! Or the lack thereof?This Perspective is based on the author’s J.C. Stevenson Memorial Lecture delivered at the Canadian Conference for Fisheries Research in Halifax, Nova Scotia, January 2008.
    Canadian Science Publishing ; 2009
    In:  Canadian Journal of Fisheries and Aquatic Sciences Vol. 66, No. 8 ( 2009-08), p. 1383-1398
    Details
    In: Canadian Journal of Fisheries and Aquatic Sciences, Canadian Science Publishing, Vol. 66, No. 8 ( 2009-08), p. 1383-1398
    Abstract: Ecological speciation occurs when adaptation to different environments or resources causes the evolution of reproductive isolation. This process is now thought to be very important in the evolution of biological diversity. Indeed, support for ecological speciation is so often asserted in the literature that one can get the impression of ubiquity. Eager to ride on the coattails of this exciting work, my own research has investigated ecological speciation in guppies, sticklebacks, and Darwin’s finches. Much to my initial dismay, I failed to find simple and strong signatures of ecological speciation in the first two of these systems. Setting aside the possibility of personal incompetence, my apparent deviation from ubiquity might simply reflect an existing literature bias. This bias seems obvious in retrospect given that essentially all published studies of ecological speciation purport to be confirmatory, whereas many cases of divergent selection and adaptive divergence are associated with only weak to modest levels of reproductive isolation. In short, different populations can be arrayed along a continuum from panmixia to complete reproductive isolation. Variation along this continuum might profitably be used for studying factors, outlined herein, that can promote or constrain “progress” toward ecological speciation.
    Type of Medium: Online Resource
    ISSN: 0706-652X , 1205-7533
    URL: Article
    DOI: 10.1139/F09-074
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2009
    detail.hit.zdb_id: 7966-2
    detail.hit.zdb_id: 1473089-3
    SSG: 21,3
    SSG: 12
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  • 7
    Online Resource
    Online Resource
    Rheotactic response of fry from beach-spawning populations of sockeye salmon: evolution after selection is relaxed
    Canadian Science Publishing ; 1998
    In:  Canadian Journal of Zoology Vol. 76, No. 12 ( 1998-12-01), p. 2186-2193
    Details
    In: Canadian Journal of Zoology, Canadian Science Publishing, Vol. 76, No. 12 ( 1998-12-01), p. 2186-2193
    Abstract: Rheotactic response was quantified for newly emerged sockeye salmon (Oncorhynchus nerka) fry from a beach population (Pleasure Point) and from an adjacent inlet population (Cedar River). The Pleasure Point population was small in number and had been established by straying from the much larger Cedar River population no more than 13 generations previously. When tested in laboratory raceways, fry from the Cedar River population were displaced downstream in the dark but not in the light. Such behavior is typical of inlet populations and presumably reflects selection for rapid movement to rearing lakes with minimal losses to predation. Fry from the Pleasure Point population showed greater downstream displacement than the Cedar River fry. Behavioral divergence of the Pleasure Point population could not be explained by selection, because water movement was absent from the beach environment. Genetic drift appeared to be a more plausible divergence mechanism. We suggest that the rheotactic response of beach populations should reflect the founding genotypes, gene flow from other populations, and random genetic drift. The results of previously published studies on the rheotactic response of beach fry in two other lake systems qualitatively support our hypothesis.
    Type of Medium: Online Resource
    ISSN: 0008-4301 , 1480-3283
    URL: Article
    DOI: 10.1139/z98-174
    RVK:
    WA 15000
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1998
    detail.hit.zdb_id: 1490831-1
    SSG: 12
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  • 8
    Online Resource
    Online Resource
    Incubation temperature, developmental biology, and the divergence of sockeye salmon ( Oncorhynchus nerka ) within Lake Washington
    Canadian Science Publishing ; 1998
    In:  Canadian Journal of Fisheries and Aquatic Sciences Vol. 55, No. 6 ( 1998-06-01), p. 1387-1394
    Details
    In: Canadian Journal of Fisheries and Aquatic Sciences, Canadian Science Publishing, Vol. 55, No. 6 ( 1998-06-01), p. 1387-1394
    Abstract: 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.
    Type of Medium: Online Resource
    ISSN: 0706-652X , 1205-7533
    URL: Article
    DOI: 10.1139/f98-020
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1998
    detail.hit.zdb_id: 7966-2
    detail.hit.zdb_id: 1473089-3
    SSG: 21,3
    SSG: 12
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