Please use this identifier to cite or link to this item:

The trophic ecology of two ommastrephid squid species, Ommastrephes bartramii and Sthenoteuthis oualaniensis, in the north Pacific sub-tropical gyre

File Description Size Format  
uhm phd 4309 uh.pdf Version for UH users 11.31 MB Adobe PDF View/Open
uhm phd 4309 r.pdf Version for non-UH users. Copying/Printing is not permitted 11.31 MB Adobe PDF View/Open

Item Summary

dc.contributor.advisor Young, Richard Parry, Matthew P. 2008-10-25T00:03:05Z 2008-10-25T00:03:05Z 2003
dc.description Thesis (Ph. D.)--University of Hawaii at Manoa, 2003.
dc.description Mode of access: World Wide Web.
dc.description Includes bibliographical references (leaves 37-43).
dc.description Electronic reproduction.
dc.description Also available by subscription via World Wide Web
dc.description iii, 285 leaves, bound ill. 29 cm
dc.description.abstract This paper examines the trophic ecology of the squids Ommastrephes bartramii and Sthenoteuthis oualaniensis, using stomach contents and stable isotopic techniques. Simple energetics models were constructed using some of the data collected. Samples for stomach contents were collected from 1996-2001 and 323 O. bartramii and 302 S. oualaniensis were captured. Fish and cephalopod remains dominated the stomach contents. Myctophids were found most abundantly in both squids, Symbolophorus evermanni was recovered at the highest percentage (7.5%) in O. bartramii, while M. lychnobium or spinosum, Lobianchia gemellerii, and Myctophum selenoides were all recovered at similar proportions (≃5%). Of the Myctophidae found in S. oualaniensis stomachs, S. evermanni was the most abundant (37%), followed by C. warmingii and H. proximum/rheinhardti (both ≃15%), and M. Iychnobium (5%). Beaks from Onychoteuthidae occurred most frequently (14%) in O. bartramii, while Histioteuthidae, Enoploteuthidae, and unidentified beaks all occurred at similar frequencies (10-12%). In S. oualaniensis, Enoploteuthidae occurred most frequently (17%) followed by Onychoteuthidae (10%). The diet of O. bartramii was more general while S. oualaniensis diet was more specialized on certain prey groups. From 1998-2001 samples were taken from captured squids for stable isotope analyses, 143 O. bartramii and 160 S. oualaniensis. SIA was conducted on the mantle muscle of O. bartramii that were divided into five categories based on mantle length, (1-7 mm) was 6.4 , (75-100 mm) was 6.9 , (200-300 mm) was 11.1 , (300-400) was 13.3%, (400-570 mm) was 12.8 . The S15N values for all O. bartramii mantle muscle samples showed a logistic increase with mantle length. The mean S15N value for S. oualaniensis sub-adult and adult mantle muscle (128 to 324 mm) was 8.2 The mean S15N value for paralarvae was 6.2 . The S15N values for all S. oualaniensis mantle muscle samples showed an exponential increase with mantle length. Eye lenses, and blood samples were also taken from each squid species and showed similar patterns of S15N increase with mantle length respectively, blood was unavailable in the smaller size ranges of O. bartramii.
dc.format electronic resource
dc.language.iso en-US
dc.publisher University of Hawaii at Manoa
dc.relation Theses for the degree of Doctor of Philosophy (University of Hawaii at Manoa). Oceanography (Marine Biology); no. 4309
dc.rights All UHM dissertations and theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner.
dc.title The trophic ecology of two ommastrephid squid species, Ommastrephes bartramii and Sthenoteuthis oualaniensis, in the north Pacific sub-tropical gyre
dc.type Thesis
dc.type.dcmi Text
dc.contributor.department Oceanography (Marine Biology) 2003-05
local.identifier.callnumber AC1 .H3 no. 4309
local.thesis.degreelevel PhD
Appears in Collections: Ph.D. - Oceanography (Marine Biology)

Please email if you need this content in ADA-compliant format.

Items in ScholarSpace are protected by copyright, with all rights reserved, unless otherwise indicated.