The preliminary data presented in the following PDF is not to be used without the author s consent.
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1 The preliminary data presented in the following PDF is not to be used without the author s consent. James Sulikowski, Ph.D. Marine Science Center University of New England 11 Hills Beach Rd. Biddeford, ME jsulikowski@une.edu
2 Dismissing Dogma: Using satellite tag technology to gain new insights into the horizontal and vertical movement patterns of spiny dogfish.
3 Segregation voracious and opportunistic Dogfish Along the U.S. Highly piscivorous, but maintains broad diet Potentially makes extended North -South migrations Atlantic Coast
4 Contentious topic
5 NMFS Spring Survey Three year moving averages SSB (2005) SSB (2007) ~ 53,600 mt 155,800 mt Biologically does not make sense
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16 Calculated Averaged Argos Start Point End Point 25
17 QuickTime and a Video decompressor are needed to see this picture.
18 QuickTime and a Cinepak decompressor are needed to see this picture.
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20 /12/07 11/14/07 11/16/07 11/18/07 11/20/07 11/22/07 11/24/07 11/26/07 11/28/07 11/30/07 12/2/07 12/4/07 12/6/07 12/8/07 12/10/07 12/12/07 12/14/07 12/16/07 12/18/07 12/20/07 12/22/07 12/24/07 12/26/07 12/28/07 12/30/07 1/1/08 1/3/08 1/5/08 1/7/08 1/9/08 1/11/08 1/13/08 1/15/08 1/17/
21 /12/07 11/14/07 11/16/07 11/18/07 11/20/07 11/22/07 11/24/07 11/26/07 11/28/07 11/30/07 12/2/07 12/4/07 12/6/07 12/8/07 12/10/07 12/12/07 12/14/07 12/16/07 12/18/07 12/20/07 12/22/07 12/24/07 12/26/07 12/28/07 12/30/07 1/1/08 1/3/08 1/5/08 1/7/08 1/9/08 1/11/08 1/13/08 1/15/
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23 /31/07 11/7/07 11/14/07 11/21/07 11/28/07 12/5/07 12/12/07 12/19/07 12/26/07 1/2/08 1/9/08 1/16/08 1/23/08 1/30/08 2/6/08 2/13/08 2/20/08 2/27/08 3/5/08 3/12/08 3/19/08 3/26/08 4/2/08 4/9/08 4/16/08 4/23/
24 0 10/31/07 11/7/07 11/14/07 11/21/07 11/28/07 12/5/07 12/12/07 12/19/07 12/26/07 1/2/08 1/9/08 1/16/08 1/23/08 TAG 1 1/30/08 2/6/08 2/13/08 2/20/08 2/27/08 3/5/08 3/12/08 3/19/08 3/26/08 4/2/08 4/9/08 4/16/08 4/23/08 TAG Depth (meters) TAG
25 Nmfs trawl
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27 /12/07 11/14/07 11/16/07 11/18/07 11/20/07 11/22/07 11/24/07 11/26/07 11/28/07 11/30/07 12/2/07 12/4/07 12/6/07 12/8/07 12/10/07 12/12/07 12/14/07 12/16/07 12/18/07 12/20/07 12/22/07 12/24/07 12/26/07 12/28/07 12/30/07 1/1/08 1/3/08 1/5/08 1/7/08 1/9/08 1/11/08 1/13/08 1/15/08 1/17/08 90% in survey area 0% at a catch able depth
28 35% of time in survey area /12/07 11/14/07 11/16/07 11/18/07 11/20/07 11/22/07 11/24/07 11/26/07 11/28/07 11/30/07 12/2/07 12/4/07 12/6/07 12/8/07 12/10/07 12/12/07 12/14/07 12/16/07 12/18/07 12/20/07 12/22/07 12/24/07 12/26/07 12/28/07 12/30/07 1/1/08 1/3/08 1/5/08 1/7/08 1/9/08 1/11/08 1/13/08 1/15/08 24% at a catch able depth
29 SSB (2007) SSB tag (2007) 155,800mt 623,200mt Total biomass (2007) 478,600 Total biomass tag (2007) 1,914,400
30 Anomalies????? SSB (2005) SSB (2007) ~ 53,000mt 155,800mt NEFSC male to female ratio is 4-1 East Carolina male to female ratio is 1-11 Gulf of Maine male to female ratio was 1-7 Groundfish to dogfish ratio was 1-30
31 Trophic perspective SSB= 155,800 mt 478,000 metric ton biomass estimates from NEFSC trawl surveys in 2007 (males + females) Dogfish consume about 1.5% of their body weight per day. Dogfish eats 6x it s body weight every year 2.8 million metric tons of prey were needed to support last years biomass estimate of spiny dogfish
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33 Gadoids, herring, sand lance
34 Trophic perspective 1.9 million metric ton biomass estimates from Sat Tag data Dogfish consume about 1.5% of their body weight per day. Dogfish eats 6x it s body weight every year 11.5 million metric tons of prey were needed to support last years biomass estimate of spiny dogfish
35 Where do we go from here 1. Quantify sex-specific horizontal and vertical movements patterns of spiny dogfish in the northwest Atlantic ocean. 2. Compare the vertical and horizontal movement patterns of satellite tagged dogfish to the NEFSC bottom trawl survey over the same temporal time period foranomalies in catchability. 3. Compare movement patterns of males and females within the northwest Atlantic ocean to ascertain the true sex ratio of the population.
36 Ben Galuardi Large Pelagics Research Center UNE Marine Science Center All my undergrads NEC
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38 Genetic Studies 6 Locations 50 fin clips each DNA extracted 50 North Cape Cod 50 South Cape Cod
39 Diet: previous studies segregation and packs voracious and opportunistic highly piscivorous, but maintains broad diet diet tracks prey abundance Seasonal and ontogenic shifts Potential competition
40 Reproductive Biology
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42 Size (mm) Parturition Copulation Ovulation ProportionMatureSperm FollicleSize PupL st Proportion mature spermatocysts 0 Jan Feb March April May June July Aug Sept Oct Nov Month 0.0
43 Asynchronous reproduction
44 Future Studies More Satellite tags Mature males vs. females Different stocks/ migration Competition for resources with local species Ontogenic shifts Investigate anomalies in the reproductive cycle
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48 /12/07 11/14/07 11/16/07 11/18/07 11/20/07 11/22/07 11/24/07 11/26/07 11/28/07 11/30/07 12/2/07 12/4/07 12/6/07 12/8/07 12/10/07 12/12/07 12/14/07 12/16/07 12/18/07 12/20/07 12/22/07 12/24/07 12/26/07 12/28/07 12/30/07 1/1/08 1/3/08 1/5/08 1/7/08 1/9/08 1/11/08 1/13/08 1/15/
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