Prey Selectivity And Diet Overlap In Juvenile Pink Chum And Sockeye Salmon In The Gulf Of Alaska And Prince William Sound Alaska PDF Download
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Author | : Mikhail A. Blikshteyn |
Publisher | : |
Total Pages | : 192 |
Release | : 2005 |
Genre | : Salmon |
ISBN | : |
Download Prey Selectivity and Diet Overlap in Juvenile Pink, Chum and Sockeye Salmon in the Gulf of Alaska and Prince William Sound, Alaska Book in PDF, ePub and Kindle
"Pink, chum and sockeye salmon are the three most commercially important Pacific salmon. As juveniles, they co-occur in coastal waters of Alaska. To assess the potential for competition among juveniles of these species, I examined their diets in Prince William Sound and in nearby continental shelf waters in the summer and fall of 2001 and quantified surface zooplankton at the same sampling stations. I estimated diet diversity, diet overlap and prey selectivity of the three species. A large proportion of gelatinous prey, especially larvaceans, characterized juvenile chum salmon diet. A pteropod, Limacina sp., was an important prey for juvenile pink and sockeye salmon. Juvenile pink and sockeye salmon diets consisted of a wider variety of prey than those of chum salmon; they also had a higher prey overlap with each other than with chum salmon. The three species showed similar trends in selectivity in Prince William Sound and in shelf waters. These results suggest that there is a higher probability of competition between juvenile pink and sockeye salmon than between either juvenile pink or sockeye salmon and chum salmon"--Leaf iii.
Author | : David R. Barnard |
Publisher | : |
Total Pages | : 146 |
Release | : 1981 |
Genre | : Chum salmon |
ISBN | : |
Download Prey Relationships Between Juvenile Pink (Oncorhynchus Gorbuscha) and Chum (O. Keta) Salmon in Prince William Sound, Alaska Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : |
Release | : 2004 |
Genre | : Chum salmon |
ISBN | : |
Download Diet Overlap and Potential Feeding Competition Between Yukon River Chum Salmon and Hatchery Salmon in the Gulf of Alaska in Summer Book in PDF, ePub and Kindle
Author | : Douglas H. Duncan |
Publisher | : |
Total Pages | : 200 |
Release | : 2018 |
Genre | : Chum salmon |
ISBN | : |
Download Navigating the Predator Gauntlet Book in PDF, ePub and Kindle
Juvenile chum salmon (Oncorhynchus keta) undergo extensive mortality at marine entry, a period which is believed to be a potential population bottleneck. Although this early mortality has been consistently observed, our understanding of the mechanisms responsible is limited. Furthermore, the implications of large-scale salmon hatchery releases for the ecology of juvenile chum salmon and their consumers is another important knowledge gap. To better understand the predation responses of abundant consumers to hatchery- and wild-born juvenile chum salmon, we examined the diets of Pacific staghorn sculpin (Leptocottus armatus) and Dolly Varden (Salvelinus malma) near Juneau, Alaska, in 2016 and 2017. Chum salmon composed 4.5% and 19.6% of the diets of staghorn sculpin and Dolly Varden by weight, respectively, and 88% of chum salmon individuals consumed were of hatchery origin. Chum salmon prey were shorter than average when compared to chum salmon concurrently collected by beach seine and hatchery releases of chum salmon. Regression analyses indicated that occurrence of juvenile chum salmon in diets varied primarily by date and site. Predation generally occurred more frequently at sites closer to hatchery release areas. The quantity of chum salmon in staghorn sculpin stomachs was related to predator length, chum salmon catch-per-unit-effort (CPUE), and the proportion of hatchery fish present; however, date was the only important predictor explaining quantity of chum salmon in Dolly Varden stomachs. To translate diet data into consumption rate, we experimentally determined gastric evacuation rate for staghorn sculpin and implemented a field-based consumption model. Average daily consumption of chum salmon was low relative to all other prey groups. Estimates of average seasonal consumption of juvenile chum salmon by staghorn sculpins suggest that predator populations would have to be implausibly large to consume even 1% of local hatchery chum salmon production. Together, these results yield new insights into the interactions between the predators of wild-born and hatchery-born salmon during the critical stage of marine entry.
Author | : C. L. Kerns |
Publisher | : |
Total Pages | : 64 |
Release | : 1985 |
Genre | : Chum salmon |
ISBN | : |
Download Diet Development for Post-larval Pink and Chum Salmon Held in Salt Water Book in PDF, ePub and Kindle
Author | : Roger Tabor |
Publisher | : |
Total Pages | : 74 |
Release | : 1996 |
Genre | : Ecology |
ISBN | : |
Download Predation on Sockeye Salmon Fry by Piscivorous Fishes in the Lower Cedar River and Southern Lake Washington Book in PDF, ePub and Kindle
Author | : Jack E. Bailey |
Publisher | : |
Total Pages | : 46 |
Release | : 1964 |
Genre | : Chum salmon |
ISBN | : |
Download Intertidal Spawning of Pink and Chum Salmon at Olsen Bay, Prince William Sound, Alaska Book in PDF, ePub and Kindle
Author | : David Gerard Parker |
Publisher | : |
Total Pages | : 352 |
Release | : 1997 |
Genre | : Fishes |
ISBN | : |
Download A Comparison of the Feeding Ecology and Growth of Juvenile Pink Salmon (Oncorhynchus Gorbuscha) in Northcentral and Southwestern Prince William Sound, Alaska Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 386 |
Release | : 2000 |
Genre | : Fisheries |
ISBN | : |
Download Recent Changes in Ocean Production of Pacific Salmon Book in PDF, ePub and Kindle
Topics: 1) Physical and biological factors affecting ocean production of Pacific salmon; 2) Detection of trends, patterns, and changes in historical salmon and environmental data; 3) Forecasts and models of Pacific salmon dynamics; 4) New research methods and techniques in ocean salmon research.
Author | : Joyce Hanson Landingham |
Publisher | : |
Total Pages | : 19 |
Release | : 2012 |
Genre | : Pacific salmon |
ISBN | : |
Download Size of Juvenile Salmon Prey from Southeastern Alaska and Northern British Columbia Book in PDF, ePub and Kindle
Data on weight, length, and volume of prey ingested by juvenile Pacific salmon (Oncorhynchus spp.) and potential prey organisms from epibenthic samples are presented. Prey ingested were measured from stomachs of 895 pink (O. gorbuscha) and 997 chum (O. keta) salmon fry collected with a beach seine in nearshore areas of Auke Bay, southeastern Alaska (SEA), from March to June 1975 and 1986. Prey from stomachs of 2,983 juveniles of five Pacific salmon species collected in deeper waters were examined from purse seine samples in SEA in July-August 1983 and 1984 and in northern British Columbia in July 1984, and from research trolling samples in SEA in May 1986 and September 1987. Potential prey samples were collected with an epibenthic sled in nearshore environments of Auke Bay from mid-April to early June 1988. Subsamples of at least 100 intact individuals of a taxon were measured and weighed, when possible. Pink and chum salmon collected in nearshore environments had consumed 68 taxonomic and life-history categories of small invertebrate prey primarily, including many insects and arachnids. Salmon collected in deeper waters had eaten approximately 34 larger taxa, about half invertebrates and half teleosts of varying size. Epibenthic samples contained 58 categories, with copepods predominating. No significant differences were found when weight data were compared with similar taxa from other sources.