Oceanographic influences on the diet of 3 surface-migrating myctophids in the eastern tropical Pacific Ocean

Van Noord, Joel E.; Olson, Robert J.; Redfern, Jessica V.; Duffy, Leanne M.; Kaufmann, Ronald S.

doi:10.7755/fb.114.3.2

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The NOAA IR serves as an archival repository of NOAA-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by NOAA or funded partners. As a repository, the NOAA IR retains documents in their original published format to ensure public access to scientific information.

i

Oceanographic influences on the diet of 3 surface-migrating myctophids in the eastern tropical Pacific Ocean

2016
By Van Noord, Joel E. ; Olson, Robert J. ; Redfern, Jessica V. ; ...
Source: Fishery Bulletin, 114(3), 274-287

[PDF-1.86 MB]

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Journal Title:

Fishery Bulletin
Personal Author:

Van Noord, Joel E. ; Olson, Robert J. ; Redfern, Jessica V. ; Duffy, Leanne M. ; Kaufmann, Ronald S.

Van Noord, Joel E. ; Olson, Robert J. ; Redfern, Jessica V. ; Duffy, Leanne M. ; Kaufmann, Ronald S. Less -
NOAA Program & Office:

NMFS (National Marine Fisheries Service) ; SWFSC (Southwest Fisheries Science Center)

NMFS (National Marine Fisheries Service) ; SWFSC (Southwest Fisheries Science Center) Less -
Description:

We examined the stomach contents of 3 vertically migrating myctophid fish species from the eastern tropical Pacific (ETP) Ocean and used a classification tree to examine the influence of spatial, biological, and oceanographic predictor variables on diet. Myctophum nitidulum (n=299), Symbolophorus reversus (n=199), and Gonichthys tenuiculus, (n=82) were collected with dip nets from surface waters, and prey taxa were quantified from bongo net tows from August through November 2006. A classification tree produced splits with longitude and sea surface salinity (SSS), thereby separating 3 geographically and oceanographically distinct regions of the ETP (offshore, nearshore, and intermediate), where diet was similar among the 3 species. Myctophids consumed, primarily, ostracods offshore (76.4% mean percentage by number [MNi]), euphausiids nearshore (45.0%), and copepods (66.6%) in the intermediate region. The offshore region was characterized by a greater abundance of ostracods in the zooplankton community (17.5% by number) and within a deep mixed-layer depth (MLD) (mean 52.6 m, max 93.0 m). SSS was low in the nearshore region (<32.9 psu) and the MLD was shallow. The intermediate region represented a transition zone between the oceanographic condition of the offshore and nearshore regions. Our results indicate that these 3 myctophid species share a similar regional diet that is strongly influenced by longitude, ostracod availability, SSS, and MLD.
Keywords:

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Aquatic Science
Source:

Fishery Bulletin, 114(3), 274-287
DOI:

https://doi.org/10.7755/fb.114.3.2
ISSN:

0090-0656
Format:

PDF
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NMFS Publications Office
Document Type:

Journal Article
License:

https://creativecommons.org/publicdomain/zero/1.0/
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CC0 Public Domain
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urn:sha-512:d7b762096ce697bfee596e753444536e3904a5ce572e19c3878063acbea527d6a54ef78cd1093fe44dadd6f4621034d0877a0c51cd53f24769257fd2e58d6e69
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https://repository.library.noaa.gov/view/noaa/63455/noaa_63455_DS1.pdf
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Oceanographic influences on the diet of 3 surface-migrating myctophids in the eastern tropical Pacific Ocean

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