Trophic Study of Oilfish, Escolar, Snake Mackerel, and Lancetfish in the Western North Atlantic Ocean and the Gulf of Mexico Using Combined Stomach Content and Stable Carbon and Nitrogen Isotope Analyses

Large, mesopelagic teleosts have a potentially keystone position in the ecology of the pelagic water column, yet remain relatively unstudied when compared to large, commercially important fishes of the epipelagic zone. In this study, the ecological roles of four large, vertically migrating teleosts,...

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Main Author: Keller, Heidi R.
Format: Others
Published: NSUWorks 2011
Subjects:
Online Access:http://nsuworks.nova.edu/occ_stuetd/114
http://nsuworks.nova.edu/cgi/viewcontent.cgi?article=1288&context=occ_stuetd
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spelling ndltd-nova.edu-oai-nsuworks.nova.edu-occ_stuetd-12882017-11-07T04:11:08Z Trophic Study of Oilfish, Escolar, Snake Mackerel, and Lancetfish in the Western North Atlantic Ocean and the Gulf of Mexico Using Combined Stomach Content and Stable Carbon and Nitrogen Isotope Analyses Keller, Heidi R. Large, mesopelagic teleosts have a potentially keystone position in the ecology of the pelagic water column, yet remain relatively unstudied when compared to large, commercially important fishes of the epipelagic zone. In this study, the ecological roles of four large, vertically migrating teleosts, oilfish, Ruvettus pretiosus, escolar, Lepidocybium flavobrunneum, snake mackerel, Gempylus serpens, longnose lancetfish, Alepisaurus ferox, and shortnose lancetfish, Alepisaurus brevirostris, were examined. The stomachs of 61 oilfish, 35 escolar, 33 snake mackerel, and 34 lancetfish were collected from nighttime, pelagic, longline fishing operations in the epipelagic zone of the western North Atlantic Ocean and Gulf of Mexico from 2007 to 2010. Stomach content analysis was used to determine predator-prey interactions. Stable carbon and nitrogen isotope analyses were performed on white dorsal muscle tissue of 38 oilfish, 23 escolar, 28 snake mackerel, and 19 lancetfish also sampled for stomach content analysis. Crustaceans were abundant prey of small oilfish, lancetfish, and to a lesser degree, snake mackerel, and they were absent from large escolar diets. Lancetfish and snake mackerel showed diverse diets that included crustaceans, polychaetes, gymnosomes, salps, cephalopods, and fishes. Large escolar stomachs contained only squid and fish. Stable isotope analyses placed small oilfish in the lowest trophic position of the group, followed by lancetfish and snake mackerel, and large escolar occupied the highest trophic position of the four species. 2011-07-01T07:00:00Z text application/pdf http://nsuworks.nova.edu/occ_stuetd/114 http://nsuworks.nova.edu/cgi/viewcontent.cgi?article=1288&context=occ_stuetd Theses and Dissertations NSUWorks oilfish escolar snake mackerel lancetfish trophic ecology stomach content analysis carbon nitrogen stable isotope analysis Marine Biology Oceanography and Atmospheric Sciences and Meteorology
collection NDLTD
format Others
sources NDLTD
topic oilfish
escolar
snake mackerel
lancetfish
trophic
ecology
stomach content analysis
carbon
nitrogen
stable isotope analysis
Marine Biology
Oceanography and Atmospheric Sciences and Meteorology
spellingShingle oilfish
escolar
snake mackerel
lancetfish
trophic
ecology
stomach content analysis
carbon
nitrogen
stable isotope analysis
Marine Biology
Oceanography and Atmospheric Sciences and Meteorology
Keller, Heidi R.
Trophic Study of Oilfish, Escolar, Snake Mackerel, and Lancetfish in the Western North Atlantic Ocean and the Gulf of Mexico Using Combined Stomach Content and Stable Carbon and Nitrogen Isotope Analyses
description Large, mesopelagic teleosts have a potentially keystone position in the ecology of the pelagic water column, yet remain relatively unstudied when compared to large, commercially important fishes of the epipelagic zone. In this study, the ecological roles of four large, vertically migrating teleosts, oilfish, Ruvettus pretiosus, escolar, Lepidocybium flavobrunneum, snake mackerel, Gempylus serpens, longnose lancetfish, Alepisaurus ferox, and shortnose lancetfish, Alepisaurus brevirostris, were examined. The stomachs of 61 oilfish, 35 escolar, 33 snake mackerel, and 34 lancetfish were collected from nighttime, pelagic, longline fishing operations in the epipelagic zone of the western North Atlantic Ocean and Gulf of Mexico from 2007 to 2010. Stomach content analysis was used to determine predator-prey interactions. Stable carbon and nitrogen isotope analyses were performed on white dorsal muscle tissue of 38 oilfish, 23 escolar, 28 snake mackerel, and 19 lancetfish also sampled for stomach content analysis. Crustaceans were abundant prey of small oilfish, lancetfish, and to a lesser degree, snake mackerel, and they were absent from large escolar diets. Lancetfish and snake mackerel showed diverse diets that included crustaceans, polychaetes, gymnosomes, salps, cephalopods, and fishes. Large escolar stomachs contained only squid and fish. Stable isotope analyses placed small oilfish in the lowest trophic position of the group, followed by lancetfish and snake mackerel, and large escolar occupied the highest trophic position of the four species.
author Keller, Heidi R.
author_facet Keller, Heidi R.
author_sort Keller, Heidi R.
title Trophic Study of Oilfish, Escolar, Snake Mackerel, and Lancetfish in the Western North Atlantic Ocean and the Gulf of Mexico Using Combined Stomach Content and Stable Carbon and Nitrogen Isotope Analyses
title_short Trophic Study of Oilfish, Escolar, Snake Mackerel, and Lancetfish in the Western North Atlantic Ocean and the Gulf of Mexico Using Combined Stomach Content and Stable Carbon and Nitrogen Isotope Analyses
title_full Trophic Study of Oilfish, Escolar, Snake Mackerel, and Lancetfish in the Western North Atlantic Ocean and the Gulf of Mexico Using Combined Stomach Content and Stable Carbon and Nitrogen Isotope Analyses
title_fullStr Trophic Study of Oilfish, Escolar, Snake Mackerel, and Lancetfish in the Western North Atlantic Ocean and the Gulf of Mexico Using Combined Stomach Content and Stable Carbon and Nitrogen Isotope Analyses
title_full_unstemmed Trophic Study of Oilfish, Escolar, Snake Mackerel, and Lancetfish in the Western North Atlantic Ocean and the Gulf of Mexico Using Combined Stomach Content and Stable Carbon and Nitrogen Isotope Analyses
title_sort trophic study of oilfish, escolar, snake mackerel, and lancetfish in the western north atlantic ocean and the gulf of mexico using combined stomach content and stable carbon and nitrogen isotope analyses
publisher NSUWorks
publishDate 2011
url http://nsuworks.nova.edu/occ_stuetd/114
http://nsuworks.nova.edu/cgi/viewcontent.cgi?article=1288&context=occ_stuetd
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