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  • 1
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    Ichthyoplankton community in the Columbia River plume off Oregon: effects of fluctuating oceanographic conditions (2021)
    In:  http://aquaticcommons.org/id/eprint/8849 | 403 | 2012-06-14 17:14:05 | 8849 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-06-28
    Description: Ichthyoplankton samples were collected at approximately2-week intervals, primarily during spring and summer 1999−2004, from two stations located 20 and 30 km from shore near the Columbia River, Oregon. Northern anchovy(Engraulis mordax) was the most abundant species collected, and was the primary species associated with summer upwelling conditions, but it showed significant interannual and seasonal fluctuations in abundance and occurrence. Other abundant taxa included sanddabs (Citharichthys spp.), English sole (Parophrys vetulus), and blacksmelts (Bathylagidae). Two-way cluster analysis revealed strong species associations based primarily on season (before orafter the spring transition date). Ichthyoplanktonabundances were compared to biological and environmentaldata, and egg and larvae abundances were found to be most correlated with sea surface temperature. The Pacific Decadal Oscillation changed sign (from negative to positive) in late 2002 and indicated overall warmerconditions in the North Pacific Ocean. Climate change is expected to alter ocean upwelling, temperatures, andColumbia River flows, and consequently fish eggs and larvae distributions and survival. Long-term research is needed to identify how ichthyoplankton and fish recruitment are affected by regional and largescale oceanographic proces
    Keywords: Biology ; Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 161-173
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  • 2
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    Diets of and trophic relationships among dominant marine nekton within the northern California Current ecosystem (2021)
    In:  http://aquaticcommons.org/id/eprint/8869 | 403 | 2014-01-02 19:23:06 | 8869 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-06-28
    Description: In this study we analyzed the diets of 26 nekton species collected from two years (2000 and 2002) off Oregon and northern California to describe dominant nekton trophicgroups of the northern California Current (NCC) pelagic ecosystem. We also examined interannual variation in thediets of three nekton species. Cluster analysis of predator diets resulted in nekton trophic groups based on theconsumption of copepods, euphausiids, brachyuran larvae, larval juvenile fishes, and adult nekton. However, many fish within trophic groups consumed prey from multipletrophic levels—euphausiids being the most widely consumed. Comparison of diets between years showed that mostvariation occurred with changes in the contribution of euphausiids and brachyuran larvae to nekton diets. The importance of euphausiids and other crustacean prey to nekton indicates that omnivory is an important characteristic of the NCC food web; however it may change during periods of lower or higher upwelling and ecosystem production.
    Keywords: Biology ; Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 548-559
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  • 3
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    Diel variation in vertical distribution of an offshore ichthyoplankton community off the Oregon coast (2021)
    In:  http://aquaticcommons.org/id/eprint/8874 | 403 | 2012-06-18 09:36:17 | 8874 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-06-28
    Description: We examined the diel ver-tical distribution, concentration, and community structure of ichthyoplank-ton from a single station 69 km off the central Oregon coast in the northeast Pacific Ocean. The 74 depth-stratified samples yielded 1571 fish larvae from 20 taxa, representing 11 families, and 128 fish eggs from 11 taxa within nine families. Dominant larval taxa were Sebastes spp. (rockfishes), Stenobra-chius leucopsarus (northern lampfish), Tarletonbeania crenularis (blue lan-ternfish), and Lyopsetta exilis (slender sole), and the dominant egg taxa were Sardinops sagax (Pacific sardine), Icichthys lockingtoni (medusafish), and Chauliodus macouni (Pacific viperfish). Larval concentrations generally increased from the surface to 50 m, then decreased with depth. Larval concentrations were higher at night than during the day, and there was evidence of larval diel vertical migration. Depth stratum was the most important factor explaining variability in larval and egg concentrations.
    Keywords: Biology ; Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 313-326
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  • 4
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    Ecology of Juvenile Walleye Pollock, Theragra chalcogramma: Papers from the workshop "The Importance of Prerecruit Walleye Pollock to the Bering Sea and North Pacific Ecosystems" Seattle, Washington, 28-30 October 1993 (2021)
    NOAA/National Marine Fisheries Service
    In:  http://aquaticcommons.org/id/eprint/2689 | 403 | 2011-09-29 18:35:26 | 2689 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-06-27
    Description: The Alaska Fisheries Science Center (AFSC), NationalMarine Fisheries Service (NMFS), hosted an internationalworkshop, 'The Importance of Prerecruit Walleye Pollock to the Bering Sea and North Pacific Ecosystems," from 28 to 30 October 1993. This workshop was held in conjunction with the annual International North Pacific Marine Science Organization (PICES) meeting held in Seattle. Nearly 100 representatives from government agencies, universities, and the fishing industry in Canada, Japan, the People's Republic of China, Russia, and the United States took part in the workshop to review and discuss current knowledge on juvenile pollock from the postlarval period to the time they recruit to the fisheries. In addition to its importance to humans as a major commercial species, pollock also serves as a major forage species for many marine fishes, birds, and mammals in the North Pacific region.(PDF file contains 236 pages.)
    Keywords: Ecology ; Management ; Fisheries
    Repository Name: AquaDocs
    Type: monograph
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  • 5
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    Food habits and dietary variability of pelagic nekton off Oregon and Washington, 1979-1984 (2021)
    NOAA/National Marine Fisheries Service
    In:  http://aquaticcommons.org/id/eprint/2765 | 403 | 2011-09-29 18:26:25 | 2765 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-06-28
    Description: The food habits of 20 species of pelagic nekton were investigated from collections made with small-mesh purse seines from 1979-84 off Washington and Oregon. Four species (spiny dogfish, Squalus acanthias; soupfin shark, Galeorhinus zyopterus; blue shark, Prionace glauca; and cutthroat trout, Salmo clarki) were mainly piscivorous. Six species (coho salmon, Oncorhynchus kisutch; chinooksalmon, O. tshawytscha; black rockfish, Sebastes melanops; yellowtail rockfish, S. f1avidus; sablefish, Anoplopoma fimbria; and jack mackerel, Trachurus symmetricus)consumed both nektonic and planktonic organisms. The remaining species (market squid, Loligo opalescens; American shad, Alosa sapidissima; Pacific herring, Clupea harengus pallasi; northern anchovy, Engraulis mordax; pinksalmon, O. gorbuscha; surf smelt, Hypomesus pretiosus; Pacific hake, Merluccius productus; Pacific saury, Cololabis saira; Pacific mackerel, Scomber japonicus;and medusafish, Icichthys lockingtom) were primarily planktonic feeders. There were substantial interannual, seasonal, and geographic variations in the diets ofseveral species due primarily to changes in prey availability. Juvenile salmonids were not commonly consumed by this assemblage of fishes (PDF file contains 36 pages.)
    Keywords: Ecology ; Management ; Fisheries
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
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  • 6
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    Distribution and relative abundance of pelagic nonsalmonid nekton Off Oregon and Washington, 1979-84 (2021)
    NOAA/National Marine Fisheries Service
    In:  http://aquaticcommons.org/id/eprint/2776 | 403 | 2011-09-29 18:27:43 | 2776 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-06-28
    Description: Fifteen fine-mesh (32-mm mesh) pelagic purse seine surveys were conducted between 1979 and 1984 off the Oregon and Washington coasts. Environmental conditions varied greatly among the years sampled, and even within years, due to variability in upwelling conditions and productivity and the effects of a strong El Nino from late 1982 to the middle of 1984. In the 843 sets made, a total of 115,891 specimens from 69 taxa was collected. Most individuals collected belonged to nine dominant taxa. Seasonal and interannual variations in the abundance and distribution patterns of these dominant taxa are presented in detail. A recurrent group analysis delineated four major groupings of nekton. (PDF file contains 91 pages.)
    Keywords: Ecology ; Fisheries ; Biology
    Repository Name: AquaDocs
    Type: monograph
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  • 7
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    JeDI: Jellyfish Database Initiative (2015)
    Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu
    Details
    Publication Date: 2022-05-26
    Description: Global records on gelatinous zooplankton for the past 200 years.
    Description: The Jellyfish Database Initiative (JeDI) is a scientifically-coordinated global database dedicated to gelatinous zooplankton (members of the Cnidaria, Ctenophora and Thaliacea) and associated environmental data. The database holds 476,000 quantitative, categorical, presence-absence and presence only records of gelatinous zooplankton spanning the past four centuries (1790-2011) assembled from a variety of published and unpublished sources. Gelatinous zooplankton data are reported to species level, where identified, but taxonomic information on phylum, family and order are reported for all records. Other auxiliary metadata, such as physical, environmental and biometric information relating to the gelatinous zooplankton metadata, are included with each respective entry. JeDI has been developed and designed as an open access research tool for the scientific community to quantitatively define the global baseline of gelatinous zooplankton populations and to describe long-term and large-scale trends in gelatinous zooplankton populations and blooms. It has also been constructed as a future repository of datasets, thus allowing retrospective analyses of the baseline and trends in global gelatinous zooplankton populations to be conducted in the future.
    Description: This project was funded by the National Science Foundation Award OCE-1030149
    Keywords: Jellyfish ; Cnidaria ; Ctenophore ; Medusa ; Salp ; Urochordate ; Tunicate ; Siphonophore ; Gelatinous zooplankton
    Repository Name: Woods Hole Open Access Server
    Type: Dataset
    Format: application/pdf
    Format: text/plain
    Format: text/csv
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