Changes in the distribution of atlantic bluefin tuna (Thunnus thynnus) in the Gulf of Maine 1979-2005
The Gulf of Maine, NW Atlantic Ocean, is a productive, seasonal foraging ground for Atlantic bluefin tuna (Thunnus thynnus), but commercial landings of adult size classes were up to 40% below the allocated total allowable catch between 2004 to 2008 for the rod and reel, harpoon, and purse seine cate...
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| description | The Gulf of Maine, NW Atlantic Ocean, is a productive, seasonal foraging ground for Atlantic bluefin tuna (Thunnus thynnus), but commercial landings of adult size classes were up to 40% below the allocated total allowable catch between 2004 to 2008 for the rod and reel, harpoon, and purse seine categories in the Gulf of Maine. Reduction in Atlantic bluefin tuna catches in the Gulf of Maine could represent a decline in spawning stock biomass, but given wide-ranging, complex migration patterns, and high energetic requirements, an alternative hypothesis is that their dispersal patterns shifted to regions with higher prey abundance or profitability, reducing availability to U.S. fishing fleets. This study fit generalized linear models to Atlantic bluefin tuna landings data collected from fishermen's logbooks (1979-2005) as well as the distances between bluefin tuna schools and Atlantic herring (Clupeaharengus), a primary prey species, to test alternative hypotheses for observed shifts in Atlantic bluefin tuna availability in the Gulf of Maine. For the bluefin model, landings varied by day of year, latitude and longitude. The effect of latitude differed by day of year and the effect of longitude differed by year. The distances between Atlantic bluefin tuna schools and Atlantic herring schools were significantly smaller (p |
| doi_str_mv | 10.1371/journal.pone.0075480 |
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Reduction in Atlantic bluefin tuna catches in the Gulf of Maine could represent a decline in spawning stock biomass, but given wide-ranging, complex migration patterns, and high energetic requirements, an alternative hypothesis is that their dispersal patterns shifted to regions with higher prey abundance or profitability, reducing availability to U.S. fishing fleets. This study fit generalized linear models to Atlantic bluefin tuna landings data collected from fishermen's logbooks (1979-2005) as well as the distances between bluefin tuna schools and Atlantic herring (Clupeaharengus), a primary prey species, to test alternative hypotheses for observed shifts in Atlantic bluefin tuna availability in the Gulf of Maine. For the bluefin model, landings varied by day of year, latitude and longitude. The effect of latitude differed by day of year and the effect of longitude differed by year. The distances between Atlantic bluefin tuna schools and Atlantic herring schools were significantly smaller (p<0.05) than would be expected from a randomly distributed population. A time series of average bluefin tuna school positions was positively correlated with the average number of herring captured per tow on Georges Bank in spring and autumn surveys respectively (p<0.01, r(2)=0.24, p<0.01, r(2)=0.42). Fishermen's logbooks contributed novel spatial and temporal information towards testing these hypotheses for the bluefin tuna fishery.</description><identifier>ISSN: 1932-6203</identifier><identifier>EISSN: 1932-6203</identifier><identifier>DOI: 10.1371/journal.pone.0075480</identifier><identifier>PMID: 24069420</identifier><language>eng</language><publisher>United States: Public Library of Science</publisher><subject>Analysis ; Animals ; Atlantic bluefin tuna ; Atlantic Ocean ; Brevoortia tyrannus ; Clupea harengus ; Commercial fishing ; Dispersal ; Economics ; Ecosystem ; Ecosystems ; Endangered & extinct species ; Fish ; Fisheries ; Fishes ; Fishing ; Forage ; Forages ; Hypotheses ; Latitude ; Logbooks ; Longitude ; Maine ; Migration ; Models, Theoretical ; Population Density ; Population Dynamics ; Prey ; Profitability ; Schools ; Spatial Analysis ; Spatial distribution ; Spawning ; Statistical models ; Thunnus thynnus ; Tuna</subject><ispartof>PloS one, 2013-09, Vol.8 (9), p.e75480-e75480</ispartof><rights>COPYRIGHT 2013 Public Library of Science</rights><rights>2013 Golet et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License: https://creativecommons.org/licenses/by/4.0/ (the “License”), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. 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Reduction in Atlantic bluefin tuna catches in the Gulf of Maine could represent a decline in spawning stock biomass, but given wide-ranging, complex migration patterns, and high energetic requirements, an alternative hypothesis is that their dispersal patterns shifted to regions with higher prey abundance or profitability, reducing availability to U.S. fishing fleets. This study fit generalized linear models to Atlantic bluefin tuna landings data collected from fishermen's logbooks (1979-2005) as well as the distances between bluefin tuna schools and Atlantic herring (Clupeaharengus), a primary prey species, to test alternative hypotheses for observed shifts in Atlantic bluefin tuna availability in the Gulf of Maine. For the bluefin model, landings varied by day of year, latitude and longitude. The effect of latitude differed by day of year and the effect of longitude differed by year. The distances between Atlantic bluefin tuna schools and Atlantic herring schools were significantly smaller (p<0.05) than would be expected from a randomly distributed population. A time series of average bluefin tuna school positions was positively correlated with the average number of herring captured per tow on Georges Bank in spring and autumn surveys respectively (p<0.01, r(2)=0.24, p<0.01, r(2)=0.42). Fishermen's logbooks contributed novel spatial and temporal information towards testing these hypotheses for the bluefin tuna fishery.</description><subject>Analysis</subject><subject>Animals</subject><subject>Atlantic bluefin tuna</subject><subject>Atlantic Ocean</subject><subject>Brevoortia tyrannus</subject><subject>Clupea harengus</subject><subject>Commercial fishing</subject><subject>Dispersal</subject><subject>Economics</subject><subject>Ecosystem</subject><subject>Ecosystems</subject><subject>Endangered & extinct species</subject><subject>Fish</subject><subject>Fisheries</subject><subject>Fishes</subject><subject>Fishing</subject><subject>Forage</subject><subject>Forages</subject><subject>Hypotheses</subject><subject>Latitude</subject><subject>Logbooks</subject><subject>Longitude</subject><subject>Maine</subject><subject>Migration</subject><subject>Models, Theoretical</subject><subject>Population Density</subject><subject>Population 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One</addtitle><date>2013-09-19</date><risdate>2013</risdate><volume>8</volume><issue>9</issue><spage>e75480</spage><epage>e75480</epage><pages>e75480-e75480</pages><issn>1932-6203</issn><eissn>1932-6203</eissn><abstract>The Gulf of Maine, NW Atlantic Ocean, is a productive, seasonal foraging ground for Atlantic bluefin tuna (Thunnus thynnus), but commercial landings of adult size classes were up to 40% below the allocated total allowable catch between 2004 to 2008 for the rod and reel, harpoon, and purse seine categories in the Gulf of Maine. Reduction in Atlantic bluefin tuna catches in the Gulf of Maine could represent a decline in spawning stock biomass, but given wide-ranging, complex migration patterns, and high energetic requirements, an alternative hypothesis is that their dispersal patterns shifted to regions with higher prey abundance or profitability, reducing availability to U.S. fishing fleets. This study fit generalized linear models to Atlantic bluefin tuna landings data collected from fishermen's logbooks (1979-2005) as well as the distances between bluefin tuna schools and Atlantic herring (Clupeaharengus), a primary prey species, to test alternative hypotheses for observed shifts in Atlantic bluefin tuna availability in the Gulf of Maine. For the bluefin model, landings varied by day of year, latitude and longitude. The effect of latitude differed by day of year and the effect of longitude differed by year. The distances between Atlantic bluefin tuna schools and Atlantic herring schools were significantly smaller (p<0.05) than would be expected from a randomly distributed population. A time series of average bluefin tuna school positions was positively correlated with the average number of herring captured per tow on Georges Bank in spring and autumn surveys respectively (p<0.01, r(2)=0.24, p<0.01, r(2)=0.42). Fishermen's logbooks contributed novel spatial and temporal information towards testing these hypotheses for the bluefin tuna fishery.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>24069420</pmid><doi>10.1371/journal.pone.0075480</doi><oa>free_for_read</oa></addata></record> |
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| subjects | Analysis Animals Atlantic bluefin tuna Atlantic Ocean Brevoortia tyrannus Clupea harengus Commercial fishing Dispersal Economics Ecosystem Ecosystems Endangered & extinct species Fish Fisheries Fishes Fishing Forage Forages Hypotheses Latitude Logbooks Longitude Maine Migration Models, Theoretical Population Density Population Dynamics Prey Profitability Schools Spatial Analysis Spatial distribution Spawning Statistical models Thunnus thynnus Tuna |
| title | Changes in the distribution of atlantic bluefin tuna (Thunnus thynnus) in the Gulf of Maine 1979-2005 |
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