scholarly journals Fisheries‐induced evolution of alternative male life history tactics in Coho salmon

2020 ◽  
Vol 13 (6) ◽  
pp. 1501-1512 ◽  
Author(s):  
Kyle A. Young ◽  
Victoria A. Cluney ◽  
Laura K. Weir
Keyword(s):  
Life History ◽  
Coho Salmon ◽  
Male Life History

Prey tell: what quillback rockfish early life history traits reveal about their survival in encounters with juvenile coho salmon

2020 ◽  
Vol 650 ◽  
pp. 7-18 ◽  
Author(s):  
HW Fennie ◽  
S Sponaugle ◽  
EA Daly ◽  
RD Brodeur
Keyword(s):  
Life History ◽  
Early Life ◽  
Life History Traits ◽  
Direct Evidence ◽  
Coho Salmon ◽  
Larval Fish ◽  
Early Life History ◽  
In The Wild ◽  
Otolith Microstructure Analysis ◽  
Pelagic Juvenile

Predation is a major source of mortality in the early life stages of fishes and a driving force in shaping fish populations. Theoretical, modeling, and laboratory studies have generated hypotheses that larval fish size, age, growth rate, and development rate affect their susceptibility to predation. Empirical data on predator selection in the wild are challenging to obtain, and most selective mortality studies must repeatedly sample populations of survivors to indirectly examine survivorship. While valuable on a population scale, these approaches can obscure selection by particular predators. In May 2018, along the coast of Washington, USA, we simultaneously collected juvenile quillback rockfish Sebastes maliger from both the environment and the stomachs of juvenile coho salmon Oncorhynchus kisutch. We used otolith microstructure analysis to examine whether juvenile coho salmon were age-, size-, and/or growth-selective predators of juvenile quillback rockfish. Our results indicate that juvenile rockfish consumed by salmon were significantly smaller, slower growing at capture, and younger than surviving (unconsumed) juvenile rockfish, providing direct evidence that juvenile coho salmon are selective predators on juvenile quillback rockfish. These differences in early life history traits between consumed and surviving rockfish are related to timing of parturition and the environmental conditions larval rockfish experienced, suggesting that maternal effects may substantially influence survival at this stage. Our results demonstrate that variability in timing of parturition and sea surface temperature leads to tradeoffs in early life history traits between growth in the larval stage and survival when encountering predators in the pelagic juvenile stage.

scholarly journals The inbreeding decline and average dominance of genes affecting male life-history characters in Drosophila melanogaster

1995 ◽  
Vol 65 (1) ◽  
pp. 41-52 ◽  
Author(s):  
Kimberly A. Hughes
Keyword(s):  
Drosophila Melanogaster ◽  
Life History ◽  
Male Fertility ◽  
Laboratory Population ◽  
Male Mating ◽  
Fitness Components ◽  
Components Of Variance ◽  
Mating Ability ◽  
Deleterious Alleles ◽  
Male Life History

SummaryThis paper describes the results of assays of male life-history characters in a large outbred laboratory population of D. melanogaster. Lines of flies homozygous for the entire third chromosome and lines of flies carrying two different third chromosomes were assayed for agespecific male mating ability (MMA), age-specific survivorship, male fertility, and body mass. The results of these assays were used to calculate the inbreeding decline associated with each of these traits, the average dominance of deleterious alleles that affect the traits, the genotypic and environmental components of variance for the homozygous lines, and phenotypic and genotypic correlations among the characters. Significant inbreeding decline was found for all characters except the Gompertz intercept and fertility. Early and late MMA show larger effects of inbreeding than any other trait. The inbreeding load for MMA is about the same magnitude as that for egg-to-adult viability, but is substantially less than that associated with total fitness. The estimated inbreeding decline and average dominance of male life-history characters are comparable to estimates for other Drosophila fitness components.

scholarly journals Breeding success of four male life history types of spring Chinook Salmon spawning in an artificial stream

2011 ◽  
Vol 94 (1) ◽  
pp. 231-248 ◽  
Author(s):  
Steve L. Schroder ◽  
Curtis M. Knudsen ◽  
Todd N. Pearsons ◽  
Todd W. Kassler ◽  
Edward P. Beall ◽  
...  
Keyword(s):  
Life History ◽  
Chinook Salmon ◽  
Breeding Success ◽  
Artificial Stream ◽  
Male Life History

scholarly journals The role of testosterone in coordinating male life history strategies: The moderating effects of the androgen receptor CAG repeat polymorphism

2017 ◽  
Vol 87 ◽  
pp. 164-175 ◽  
Author(s):  
Lee T. Gettler ◽  
Calen P. Ryan ◽  
Dan T.A. Eisenberg ◽  
Margarita Rzhetskaya ◽  
M. Geoffrey Hayes ◽  
...  
Keyword(s):  
Life History ◽  
Androgen Receptor ◽  
Cag Repeat ◽  
Life History Strategies ◽  
Moderating Effects ◽  
Repeat Polymorphism ◽  
Male Life History

Survival and life history characteristics among wild and hatchery coho salmon (Oncorhynchus kisutch) returns: how do unfed fry differ from smolt releases?

2010 ◽  
Vol 67 (3) ◽  
pp. 486-497 ◽  
Author(s):  
Véronique Thériault ◽  
Gregory R. Moyer ◽  
Michael A. Banks
Keyword(s):  
Life History ◽  
Reproductive Success ◽  
Molecular Analysis ◽  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Adult Survival ◽  
Life History Characteristics ◽  
Hatchery Program ◽  
Release Strategy ◽  
Integrated Hatchery Program

Survival and life history characteristics were evaluated for a coho salmon ( Oncorhynchus kisutch ) integrated hatchery program using two stocking strategies. Fish were released as unfed fry or smolts and returned as adults, and then molecular analysis was employed to pedigree the entire population. We showed that mean adult survival of individuals released as unfed fry was less than that of individuals released as smolts (0.03% vs. 2.39%). The relative reproductive success (RRS) of the fry release strategy to wild spawning was significantly greater for one of two cohorts, whereas the smolt release strategy to wild RRS was significantly greater for both cohorts. Fish released as smolts were significantly smaller upon returning as adults than either those released as unfed fry or wild returns. Mean run timing was also significantly biased towards an earlier run time for hatchery-released fish when compared with the wild component. The incidence of jacking (males maturing at age 2) was greater among fish stocked as smolts than for fish stocked as fry. Differences in survival, RRS, and life history appeared to be the result of hatchery practices and indicated that a fry stocking strategy produced fish more similar to the wild component of the population than to that of fish released as smolts.

Residence times of juvenile salmon and steelhead in off-channel tidal freshwater habitats, Columbia River, USA

2015 ◽  
Vol 72 (5) ◽  
pp. 684-696 ◽  
Author(s):  
Gary E. Johnson ◽  
Gene R. Ploskey ◽  
Nichole K. Sather ◽  
David J. Teel
Keyword(s):  
Life History ◽  
Fresh Water ◽  
Chinook Salmon ◽  
Coho Salmon ◽  
Columbia River ◽  
Tidal Freshwater ◽  
Life History Strategies ◽  
Residence Times ◽  
Juvenile Salmonids ◽  
Freshwater Habitats

We documented two life history strategies for juvenile salmonids as expressed in off-channel tidal freshwater habitats of the Columbia River: (i) active migrations by upper river Chinook salmon (Oncorhynchus tshawytscha) and steelhead (Oncorhynchus mykiss) during the primary spring and summer migration periods and (ii) overwinter rearing in tidal freshwater habitats by coho salmon (Oncorhynchus kisutch) and naturally produced Chinook salmon mostly from lower river sources. During spring–summer 2007–2008, acoustic-tagged fish originating above Bonneville Dam (rkm 234) had short residence times in off-channel areas (rkm 192–203): median 2.5 and 2.6 h for yearling (mean lengths 134 and 158 mm) and 3.0 and 3.4 h for subyearling (104 and 116 mm) Chinook salmon and 2.5 h for yearling steelhead (215 mm). The percentage of fish in off-channel areas out of the total in the main- and off-channels areas was highest for yearling Chinook salmon (8.1% and 9.3% for 2007 and 2008, respectively) and lowest for steelhead (4.0% for 2008) and subyearling Chinook salmon (3.6% and 6.1% for 2007 and 2008, respectively). In late January and early February 2010, 2011, and 2012, we captured and tagged yearling Chinook and coho salmon occupying off-channel tidal freshwater habitats. Median residence times in off-channel areas were 11.6–25.5 days for juvenile Chinook (106, 115, and 118 mm, respectively by year) and 11.2 days for coho salmon (116 mm). This study is the first to estimate residence times for juvenile salmonids specifically in off-channel areas of tidal fresh water and, most importantly, residence times for Chinook salmon expressing a life history of overwintering in tidal fresh water. The findings support restoration of shallow off-channel habitats in tidal freshwater portions of the Columbia River.

Modeling population responses of Chinook and coho salmon to suspended sediment using a life history approach

2015 ◽  
Vol 103 ◽  
pp. 71-83 ◽  
Author(s):  
H. Andres Araujo ◽  
Andrew B. Cooper ◽  
Erland A. MacIsaac ◽  
Duncan Knowler ◽  
Antonio Velez-Espino
Keyword(s):  
Life History ◽  
Suspended Sediment ◽  
Coho Salmon ◽  
Population Responses ◽  
History Approach

Male life history and intergroup mobility among ringtailed lemurs (Lemur catta)

1992 ◽  
Vol 13 (4) ◽  
pp. 395-413 ◽  
Author(s):  
Robert W. Sussman
Keyword(s):  
Life History ◽  
Lemur Catta ◽  
Male Life History ◽  
Ringtailed Lemurs
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