ResearchWorks Archive
    • Login
    View Item 
    •   ResearchWorks Home
    • Student Research Papers
    • Friday Harbor Laboratories
    • Friday Harbor Laboratories Student Research Papers
    • View Item
    •   ResearchWorks Home
    • Student Research Papers
    • Friday Harbor Laboratories
    • Friday Harbor Laboratories Student Research Papers
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Running Head. — Feeding Ecology of Ammodytes hexapterus

    Thumbnail
    View/Open
    Student Paper (540.8Kb)
    Date
    2012-12
    Author
    Sission, Nick
    Metadata
    Show full item record
    Abstract
    Forage fish such as herring, surf perch and Pacific sand lance are a crucial link between lower and upper elements in the food chain, transferring dense energy and vitamin content from primary producers (phytoplankton) to higher trophic levels (piscivorous fishes, birds, and marine mammals). In this study we examined the feeding ecology and trophic role of A. hexapterus in the San Juan Archipelago. We collected data on mass, fork length, population structure, substrate, and stomach contents and used a chi-square test to examine whether or not there were differences in fullness and digestion as a function diel, tidal and seasonal cycles. Our results suggest that time of day has a significant influence on stomach fullness (X2 =16.01, P=0.042), but not digestion. Date also significantly drives patterns in stomach fullness (X2 =60.57, P=0.019), but not in digestion. We used a generalized linear model to account for the corresponding effects of tidal, diel, and seasonal trends as well as difference in habitat affinity for different substrates in driving patterns of catch per unit effort (CPUE). CPUE was significantly different across the course of the fall (F1= 3.00, p=0.093) and in different substrate types (F1= 12.49, p=0.001). This study can be used to inform fisheries managers and add higher resolution to food web models.
    URI
    http://hdl.handle.net/1773/27012
    Collections
    • Friday Harbor Laboratories Student Research Papers [551]

    DSpace software copyright © 2002-2015  DuraSpace
    Contact Us | Send Feedback
    Theme by 
    @mire NV
     

     

    Browse

    All of ResearchWorksCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

    My Account

    LoginRegister

    DSpace software copyright © 2002-2015  DuraSpace
    Contact Us | Send Feedback
    Theme by 
    @mire NV