Early Life History Variation among Hatchery- and Wild-Origin Lake Trout Reared in a Hatchery Environment

2010 ◽  
Vol 139 (1) ◽  
pp. 21-28 ◽  
Author(s):  
Jenni L. McDermid ◽  
William N. Sloan ◽  
Chris C. Wilson ◽  
Brian J. Shuter
Keyword(s):  
Life History ◽  
Early Life ◽  
Lake Trout ◽  
Early Life History ◽  
Life History Variation

Early Life History Variation in Hatchery- and Natural-Origin Spring Chinook Salmon in the Yakima River, Washington

2013 ◽  
Vol 142 (2) ◽  
pp. 540-555 ◽  
Author(s):  
Donald A. Larsen ◽  
Deborah L. Harstad ◽  
Charles R. Strom ◽  
Mark V. Johnston ◽  
Curtis M. Knudsen ◽  
...  
Keyword(s):  
Life History ◽  
Chinook Salmon ◽  
Early Life ◽  
Early Life History ◽  
Life History Variation ◽  
Natural Origin ◽  
Yakima River

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 Early life history responses and phenotypic shifts in a rare endemic plant responding to climate change

2019 ◽  
Vol 7 (1) ◽  
Author(s):  
Daniel E Winkler ◽  
Michelle Yu-Chan Lin ◽  
José Delgadillo ◽  
Kenneth J Chapin ◽  
Travis E Huxman
Keyword(s):  
Climate Change ◽  
Life History ◽  
Phenotypic Variation ◽  
Early Life ◽  
Early Life History ◽  
Interactive Effects ◽  
Endemic Plant ◽  
Cushion Plant ◽  
Rare Endemic

We studied how a rare, endemic alpine cushion plant responds to the interactive effects of warming and drought. Overall, we found that both drought and warming negatively influenced the species growth but that existing levels of phenotypic variation may be enough to at least temporarily buffer populations.

Characterizing the early life history of an imperiled freshwater mussel (Ptychobranchus jonesi) with host-fish determination and fecundity estimation

2017 ◽  
Vol 36 (2) ◽  
pp. 338-350 ◽  
Author(s):  
John M. McLeod ◽  
Howard L. Jelks ◽  
Sandra Pursifull ◽  
Nathan A. Johnson
Keyword(s):  
Life History ◽  
Early Life ◽  
Freshwater Mussel ◽  
Early Life History ◽  
Host Fish ◽  
History Of
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