Recalculated diet and daily ration of the shortfin mako (Isurus oxyrinchus), with a focus on quantifying predation on bluefish (Pomatomus saltatrix) in the northwest Atlantic Ocean
The diet and daily ration of the shortfin mako (Isurus oxyrinchus) in the northwest Atlantic were re-examined to determine whether fluctuations in prey abundance and availability are ref lected in these two biological variables. During the summers of 2001 and 2002, stomach content data were collecte...
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ftunivmassamh:oai:scholarworks.umass.edu:nrc_faculty_pubs-1182 2023-05-15T17:45:32+02:00 Recalculated diet and daily ration of the shortfin mako (Isurus oxyrinchus), with a focus on quantifying predation on bluefish (Pomatomus saltatrix) in the northwest Atlantic Ocean Wood, AD Wetherbeez, BM Juanes, F Kohler, NE Wilga, C 2009-01-01T08:00:00Z https://scholarworks.umass.edu/nrc_faculty_pubs/183 unknown ScholarWorks@UMass Amherst https://scholarworks.umass.edu/nrc_faculty_pubs/183 Environmental Conservation Faculty Publication Series text 2009 ftunivmassamh 2022-09-08T17:45:30Z The diet and daily ration of the shortfin mako (Isurus oxyrinchus) in the northwest Atlantic were re-examined to determine whether fluctuations in prey abundance and availability are ref lected in these two biological variables. During the summers of 2001 and 2002, stomach content data were collected from fishing tournaments along the northeast coast of the United States. These data were quantified by using four diet indices and were compared to index calculations from historical diet data collected from 1972 through 1983. Bluefish (Pomatomus saltatrix) were the predominant prey in the 1972–83 and 2001–02 diets, accounting for 92.6% of the current diet by weight and 86.9% of the historical diet by volume. From the 2001– 02 diet data, daily ration was estimated and it indicated that shortfin makos must consume roughly 4.6% of their body weight per day to fulfill energetic demands. The daily energetic requirement was broken down by using a calculated energy content for the current diet of 4909 KJ/kg. Based on the proportional energy of bluefish in the diet by weight, an average shortfin mako consumes roughly 500 kg of bluefish per year off the northeast coast of the United States. The results are discussed in relation to the potential effect of intense shortfin mako predation on bluefish abundance in the region. Text Northwest Atlantic University of Massachusetts: ScholarWorks@UMass Amherst |
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University of Massachusetts: ScholarWorks@UMass Amherst |
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ftunivmassamh |
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description |
The diet and daily ration of the shortfin mako (Isurus oxyrinchus) in the northwest Atlantic were re-examined to determine whether fluctuations in prey abundance and availability are ref lected in these two biological variables. During the summers of 2001 and 2002, stomach content data were collected from fishing tournaments along the northeast coast of the United States. These data were quantified by using four diet indices and were compared to index calculations from historical diet data collected from 1972 through 1983. Bluefish (Pomatomus saltatrix) were the predominant prey in the 1972–83 and 2001–02 diets, accounting for 92.6% of the current diet by weight and 86.9% of the historical diet by volume. From the 2001– 02 diet data, daily ration was estimated and it indicated that shortfin makos must consume roughly 4.6% of their body weight per day to fulfill energetic demands. The daily energetic requirement was broken down by using a calculated energy content for the current diet of 4909 KJ/kg. Based on the proportional energy of bluefish in the diet by weight, an average shortfin mako consumes roughly 500 kg of bluefish per year off the northeast coast of the United States. The results are discussed in relation to the potential effect of intense shortfin mako predation on bluefish abundance in the region. |
format |
Text |
author |
Wood, AD Wetherbeez, BM Juanes, F Kohler, NE Wilga, C |
spellingShingle |
Wood, AD Wetherbeez, BM Juanes, F Kohler, NE Wilga, C Recalculated diet and daily ration of the shortfin mako (Isurus oxyrinchus), with a focus on quantifying predation on bluefish (Pomatomus saltatrix) in the northwest Atlantic Ocean |
author_facet |
Wood, AD Wetherbeez, BM Juanes, F Kohler, NE Wilga, C |
author_sort |
Wood, AD |
title |
Recalculated diet and daily ration of the shortfin mako (Isurus oxyrinchus), with a focus on quantifying predation on bluefish (Pomatomus saltatrix) in the northwest Atlantic Ocean |
title_short |
Recalculated diet and daily ration of the shortfin mako (Isurus oxyrinchus), with a focus on quantifying predation on bluefish (Pomatomus saltatrix) in the northwest Atlantic Ocean |
title_full |
Recalculated diet and daily ration of the shortfin mako (Isurus oxyrinchus), with a focus on quantifying predation on bluefish (Pomatomus saltatrix) in the northwest Atlantic Ocean |
title_fullStr |
Recalculated diet and daily ration of the shortfin mako (Isurus oxyrinchus), with a focus on quantifying predation on bluefish (Pomatomus saltatrix) in the northwest Atlantic Ocean |
title_full_unstemmed |
Recalculated diet and daily ration of the shortfin mako (Isurus oxyrinchus), with a focus on quantifying predation on bluefish (Pomatomus saltatrix) in the northwest Atlantic Ocean |
title_sort |
recalculated diet and daily ration of the shortfin mako (isurus oxyrinchus), with a focus on quantifying predation on bluefish (pomatomus saltatrix) in the northwest atlantic ocean |
publisher |
ScholarWorks@UMass Amherst |
publishDate |
2009 |
url |
https://scholarworks.umass.edu/nrc_faculty_pubs/183 |
genre |
Northwest Atlantic |
genre_facet |
Northwest Atlantic |
op_source |
Environmental Conservation Faculty Publication Series |
op_relation |
https://scholarworks.umass.edu/nrc_faculty_pubs/183 |
_version_ |
1766148625427070976 |