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2. Direct Reaction Measurements Using GODDESS

Author

Pain, S.D., Ratkiewicz, A., Baugher, T., Febbraro, M., Lepailleur, A., Ayangeakaa, A.D., Allen, J., Anderson, J.T., Bardayan, D.W., Blackmon, J.C., Blanchard, R., Burcher, S., Carpenter, M.P., Cha, S.M., Chae, K.Y., Chipps, K.A., Cizewski, J.A., Engelhardt, A., Garland, H., Jones, K.L., Kozub, R.L., Lee, E.J., Hall, M.R., Hall, O., Hu, J., O’Malley, P.D., Marsh, I., Rasco, B.C., Santiago-Gonzales, D., Seweryniak, D., Shadrick, S., Sims, H., Smith, K., Smith, M.S., Tai, P.-L., Thompson, P., Thornsberry, C., Varner, R.L., Walter, D., Wilson, G.L., and Zhu, S.

Published
2017
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6. The upgraded DØ detector

Author

Abazov, V.M., Abbott, B., Abolins, M., Acharya, B.S., Adams, D.L., Adams, M., Adams, T., Agelou, M., Agram, J.-L., Ahmed, S.N., Ahn, S.H., Ahsan, M., Alexeev, G.D., Alkhazov, G., Alton, A., Alverson, G., Alves, G.A., Anastasoaie, M., Andeen, T., Anderson, J.T., Anderson, S., Andrieu, B., Angstadt, R., Anosov, V., Arnoud, Y., Arov, M., Askew, A., Åsman, B., Assis Jesus, A.C.S., Atramentov, O., Autermann, C., Avila, C., Babukhadia, L., Bacon, T.C., Badaud, F., Baden, A., Baffioni, S., Bagby, L., Baldin, B., Balm, P.W., Banerjee, P., Banerjee, S., Barberis, E., Bardon, O., Barg, W., Bargassa, P., Baringer, P., Barnes, C., Barreto, J., Bartlett, J.F., Bassler, U., Bhattacharjee, M., Baturitsky, M.A., Bauer, D., Bean, A., Baumbaugh, B., Beauceron, S., Begalli, M., Beaudette, F., Begel, M., Bellavance, A., Beri, S.B., Bernardi, G., Bernhard, R., Bertram, I., Besançon, M., Besson, A., Beuselinck, R., Beutel, D., Bezzubov, V.A., Bhat, P.C., Bhatnagar, V., Binder, M., Biscarat, C., Bishoff, A., Black, K.M., Blackler, I., Blazey, G., Blekman, F., Blessing, S., Bloch, D., Blumenschein, U., Bockenthien, E., Bodyagin, V., Boehnlein, A., Boeriu, O., Bolton, T.A., Bonamy, P., Bonifas, D., Borcherding, F., Borissov, G., Bos, K., Bose, T., Boswell, C., Bowden, M., Brandt, A., Briskin, G., Brock, R., Brooijmans, G., Bross, A., Buchanan, N.J., Buchholz, D., Buehler, M., Buescher, V., Burdin, S., Burke, S., Burnett, T.H., Busato, E., Buszello, C.P., Butler, D., Butler, J.M., Cammin, J., Caron, S., Bystricky, J., Canal, L., Canelli, F., Carvalho, W., Casey, B.C.K., Casey, D., Cason, N.M., Castilla-Valdez, H., Chakrabarti, S., Chakraborty, D., Chan, K.M., Chandra, A., Chapin, D., Charles, F., Cheu, E., Chevalier, L., Chi, E., Chiche, R., Cho, D.K., Choate, R., Choi, S., Choudhary, B., Chopra, S., Christenson, J.H., Christiansen, T., Christofek, L., Churin, I., Cisko, G., Claes, D., Clark, A.R., Clément, B., Clément, C., Coadou, Y., Colling, D.J., Coney, L., Connolly, B., Cooke, M., Cooper, W.E., Coppage, D., Corcoran, M., Coss, J., Cothenet, A., Cousinou, M.-C., Cox, B., Crépé-Renaudin, S., Cristetiu, M., Cummings, M.A.C., Cutts, D., da Motta, H., Das, M., Davies, B., Davies, G., Davis, G.A., Davis, W., De, K., de Jong, P., de Jong, S.J., De La Cruz-Burelo, E., De La Taille, C., De Oliveira Martins, C., Dean, S., Degenhardt, J.D., Déliot, F., Delsart, P.A., Del Signore, K., DeMaat, R., Demarteau, M., Demina, R., Demine, P., Denisov, D., Denisov, S.P., Desai, S., Diehl, H.T., Diesburg, M., Doets, M., Doidge, M., Dong, H., Doulas, S., Dudko, L.V., Duflot, L., Dugad, S.R., Duperrin, A., Dvornikov, O., Dyer, J., Dyshkant, A., Eads, M., Edmunds, D., Edwards, T., Ellison, J., Elmsheuser, J., Eltzroth, J.T., Elvira, V.D., Eno, S., Ermolov, P., Eroshin, O.V., Estrada, J., Evans, D., Evans, H., Evdokimov, A., Evdokimov, V.N., Fagan, J., Fast, J., Fatakia, S.N., Fein, D., Feligioni, L., Ferapontov, A.V., Ferbel, T., Ferreira, M.J., Fiedler, F., Filthaut, F., Fisher, W., Fisk, H.E., Fleck, I., Fitzpatrick, T., Flattum, E., Fleuret, F., Flores, R., Foglesong, J., Fortner, M., Fox, H., Franklin, C., Freeman, W., Fu, S., Fuess, S., Gadfort, T., Galea, C.F., Gallas, E., Galyaev, E., Gao, M., Garcia, C., Garcia-Bellido, A., Gardner, J., Gavrilov, V., Gay, A., Gay, P., Gelé, D., Gelhaus, R., Genser, K., Gerber, C.E., Gershtein, Y., Gillberg, D., Geurkov, G., Ginther, G., Gobbi, B., Goldmann, K., Golling, T., Gollub, N., Golovtsov, V., Gómez, B., Gomez, G., Gomez, R., Goodwin, R., Gornushkin, Y., Gounder, K., Goussiou, A., Graham, D., Graham, G., Grannis, P.D., Gray, K., Greder, S., Green, D.R., Green, J., Green, J.A., Greenlee, H., Greenwood, Z.D., Gregores, E.M., Grinstein, S., Gris, Ph., Grivaz, J.-F., Groer, L., Grünendahl, S., Grünewald, M.W., Gu, W., Guglielmo, J., Gupta, A., Gurzhiev, S.N., Gutierrez, G., Gutierrez, P., Haas, A., Hadley, N.J., Haggard, E., Haggerty, H., Hagopian, S., Hall, I., Hall, R.E., Han, C., Han, L., Hance, R., Hanagaki, K., Hanlet, P., Hansen, S., Harder, K., Harel, A., Harrington, R., Hauptman, J.M., Hauser, R., Hays, C., Hays, J., Hazen, E., Hebbeker, T., Hebert, C., Hedin, D., Heinmiller, J.M., Heinson, A.P., Heintz, U., Hensel, C., Hesketh, G., Hildreth, M.D., Hirosky, R., Hobbs, J.D., Hoeneisen, B., Hohlfeld, M., Hong, S.J., Hooper, R., Hou, S., Houben, P., Hu, Y., Huang, J., Huang, Y., Hynek, V., Huffman, D., Iashvili, I., Illingworth, R., Ito, A.S., Jabeen, S., Jacquier, Y., Jaffré, M., Jain, S., Jain, V., Jakobs, K., Jayanti, R., Jenkins, A., Jesik, R., Jiang, Y., Johns, K., Johnson, M., Johnson, P., Jonckheere, A., Jonsson, P., Jöstlein, H., Jouravlev, N., Juarez, M., Juste, A., Kaan, A.P., Kado, M.M., Käfer, D., Kahl, W., Kahn, S., Kajfasz, E., Kalinin, A.M., Kalk, J., Kalmani, S.D., Karmanov, D., Kasper, J., Katsanos, I., Kau, D., Kaur, R., Ke, Z., Kehoe, R., Kermiche, S., Kesisoglou, S., Khanov, A., Kharchilava, A., Kharzheev, Y.M., Kim, H., Kim, K.H., Kim, T.J., Kirsch, N., Klima, B., Klute, M., Kohli, J.M., Konrath, J.-P., Komissarov, E.V., Kopal, M., Korablev, V.M., Kostritski, A., Kotcher, J., Kothari, B., Kotwal, A.V., Koubarovsky, A., Kozelov, A.V., Kozminski, J., Kryemadhi, A., Kouznetsov, O., Krane, J., Kravchuk, N., Krempetz, K., Krider, J., Krishnaswamy, M.R., Krzywdzinski, S., Kubantsev, M., Kubinski, R., Kuchinsky, N., Kuleshov, S., Kulik, Y., Kumar, A., Kunori, S., Kupco, A., Kurča, T., Kvita, J., Kuznetsov, V.E., Kwarciany, R., Lager, S., Lahrichi, N., Landsberg, G., Larwill, M., Laurens, P., Lavigne, B., Lazoflores, J., Le Bihan, A.-C., Le Meur, G., Lebrun, P., Lee, S.W., Lee, W.M., Leflat, A., Leggett, C., Lehner, F., Leitner, R., Leonidopoulos, C., Leveque, J., Lewis, P., Li, J., Li, Q.Z., Li, X., Lima, J.G.R., Lincoln, D., Lindenmeyer, C., Linn, S.L., Linnemann, J., Lipaev, V.V., Lipton, R., Litmaath, M., Lizarazo, J., Lobo, L., Lobodenko, A., Lokajicek, M., Lounis, A., Love, P., Lu, J., Lubatti, H.J., Lucotte, A., Lueking, L., Luo, C., Lynker, M., Lyon, A.L., Machado, E., Maciel, A.K.A., Madaras, R.J., Mättig, P., Magass, C., Magerkurth, A., Magnan, A.-M., Maity, M., Makovec, N., Mal, P.K., Malbouisson, H.B., Malik, S., Malyshev, V.L., Manakov, V., Mao, H.S., Maravin, Y., Markley, D., Markus, M., Marshall, T., Martens, M., Martin, M., Martin-Chassard, G., Mattingly, S.E.K., Matulik, M., Mayorov, A.A., McCarthy, R., McCroskey, R., McKenna, M., McMahon, T., Meder, D., Melanson, H.L., Melnitchouk, A., Mendes, A., Mendoza, D., Mendoza, L., Meng, X., Merekov, Y.P., Merkin, M., Merritt, K.W., Meyer, A., Meyer, J., Michaut, M., Miao, C., Miettinen, H., Mihalcea, D., Mikhailov, V., Miller, D., Mitrevski, J., Mokhov, N., Molina, J., Mondal, N.K., Montgomery, H.E., Moore, R.W., Moulik, T., Muanza, G.S., Mostafa, M., Moua, S., Mulders, M., Mundim, L., Mutaf, Y.D., Nagaraj, P., Nagy, E., Naimuddin, M., Nang, F., Narain, M., Narasimhan, V.S., Narayanan, A., Naumann, N.A., Neal, H.A., Negret, J.P., Nelson, S., Neuenschwander, R.T., Neustroev, P., Noeding, C., Nomerotski, A., Novaes, S.F., Nozdrin, A., Nunnemann, T., Nurczyk, A., Nurse, E., O’Dell, V., O’Neil, D.C., Oguri, V., Olis, D., Oliveira, N., Olivier, B., Olsen, J., Oshima, N., Oshinowo, B.O., Otero y Garzón, G.J., Padley, P., Papageorgiou, K., Parashar, N., Park, J., Park, S.K., Parsons, J., Partridge, R., Parua, N., Patwa, A., Pawloski, G., Perea, P.M., Perez, E., Peters, O., Pétroff, P., Petteni, M., Phaf, L., Piegaia, R., Pleier, M.-A., Podesta-Lerma, P.L.M., Podstavkov, V.M., Pogorelov, Y., Pol, M.-E., Pompoš, A., Polosov, P., Pope, B.G., Popkov, E., Porokhovoy, S., Prado da Silva, W.L., Pritchard, W., Prokhorov, I., Prosper, H.B., Protopopescu, S., Przybycien, M.B., Qian, J., Quadt, A., Quinn, B., Ramberg, E., Ramirez-Gomez, R., Rani, K.J., Ranjan, K., Rao, M.V.S., Rapidis, P.A., Rapisarda, S., Raskowski, J., Ratoff, P.N., Ray, R.E., Reay, N.W., Rechenmacher, R., Reddy, L.V., Regan, T., Renardy, J.-F., Reucroft, S., Rha, J., Ridel, M., Rijssenbeek, M., Ripp-Baudot, I., Rizatdinova, F., Robinson, S., Rodrigues, R.F., Roco, M., Rotolo, C., Royon, C., Rubinov, P., Ruchti, R., Rucinski, R., Rud, V.I., Russakovich, N., Russo, P., Sabirov, B., Sajot, G., Sánchez-Hernández, A., Sanders, M.P., Santoro, A., Satyanarayana, B., Savage, G., Sawyer, L., Scanlon, T., Schaile, D., Schamberger, R.D., Scheglov, Y., Schellman, H., Schieferdecker, P., Schmitt, C., Schwanenberger, C., Schukin, A.A., Schwartzman, A., Schwienhorst, R., Sengupta, S., Severini, H., Shabalina, E., Shamim, M., Shankar, H.C., Shary, V., Shchukin, A.A., Sheahan, P., Shephard, W.D., Shivpuri, R.K., Shishkin, A.A., Shpakov, D., Shupe, M., Sidwell, R.A., Simak, V., Sirotenko, V., Skow, D., Skubic, P., Slattery, P., Smith, D.E., Smith, R.P., Smolek, K., Snow, G.R., Snow, J., Snyder, S., Söldner-Rembold, S., Song, X., Song, Y., Sonnenschein, L., Sopczak, A., Sorín, V., Sosebee, M., Soustruznik, K., Souza, M., Spartana, N., Spurlock, B., Stanton, N.R., Stark, J., Steele, J., Stefanik, A., Steinberg, J., Steinbrück, G., Stevenson, K., Stolin, V., Stone, A., Stoyanova, D.A., Strandberg, J., Strang, M.A., Strauss, M., Ströhmer, R., Strom, D., Strovink, M., Stutte, L., Sumowidagdo, S., Sznajder, A., Talby, M., Tentindo-Repond, S., Tamburello, P., Taylor, W., Telford, P., Temple, J., Terentyev, N., Teterin, V., Thomas, E., Thompson, J., Thooris, B., Titov, M., Toback, D., Tokmenin, V.V., Tolian, C., Tomoto, M., Tompkins, D., Toole, T., Torborg, J., Touze, F., Towers, S., Trefzger, T., Trincaz-Duvoid, S., Trippe, T.G., Tsybychev, D., Tuchming, B., Tully, C., Turcot, A.S., Tuts, P.M., Utes, M., Uvarov, L., Uvarov, S., Uzunyan, S., Vachon, B., van den Berg, P.J., van Gemmeren, P., Van Kooten, R., van Leeuwen, W.M., Varelas, N., Varnes, E.W., Vartapetian, A., Vasilyev, I.A., Vaupel, M., Vaz, M., Verdier, P., Vertogradov, L.S., Verzocchi, M., Vigneault, M., Villeneuve-Seguier, F., Vishwanath, P.R., Vlimant, J.-R., Von Toerne, E., Vorobyov, A., Vreeswijk, M., Vu Anh, T., Vysotsky, V., Wahl, H.D., Walker, R., Wallace, N., Wang, L., Wang, Z.-M., Warchol, J., Warsinsky, M., Watts, G., Wayne, M., Weber, M., Weerts, H., Wegner, M., Wermes, N., Wetstein, M., White, A., White, V., Whiteson, D., Wicke, D., Wijnen, T., Wijngaarden, D.A., Wilcer, N., Willutzki, H., Wilson, G.W., Wimpenny, S.J., Wittlin, J., Wlodek, T., Wobisch, M., Womersley, J., Wood, D.R., Wyatt, T.R., Wu, Z., Xie, Y., Xu, Q., Xuan, N., Yacoob, S., Yamada, R., Yan, M., Yarema, R., Yasuda, T., Yatsunenko, Y.A., Yen, Y., Yip, K., Yoo, H.D., Yoffe, F., Youn, S.W., Yu, J., Yurkewicz, A., Zabi, A., Zanabria, M., Zatserklyaniy, A., Zdrazil, M., Zeitnitz, C., Zhang, B., Zhang, D., Zhang, X., Zhao, T., Zhao, Z., Zheng, H., Zhou, B., Zhu, J., Zielinski, M., Zieminska, D., Zieminski, A., Zitoun, R., Zmuda, T., Zutshi, V., Zviagintsev, S., Zverev, E.G., and Zylberstejn, A.

Published
2006
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8. Direct Reaction Measurements Using GODDESS

Author

Hall, M.R., Cizewski, J.A., Burcher, S., Rasco, B.C., Ratkiewicz, A., Engelhardt, A., Kozub, R.L., Lee, E.J., Chae, K.Y., Pain, S.D., Wilson, G.L., Smith, M.S., Smith, K., Marsh, I., Cha, S.M., Blackmon, J.C., Carpenter, M.P., Bardayan, D.W., Lepailleur, A., Walter, D., Sims, H., Varner, R.L., Jones, K.L., Anderson, J.T., Zhu, S., Hall, O., Hu, J., Garland, H., Allen, J., Thompson, P., Chipps, K.A., Shadrick, S., O'Malley, P.D., Tai, P.-L., Seweryniak, D., Ayangeakaa, A.D., Febbraro, M., Baugher, T., Blanchard, R., Thornsberry, C., and Santiago-Gonzales, D.

Abstract

GODDESS is a coupling of the charged-particle detection system ORRUBA to the gamma-ray detector array Gammasphere. This coupling has been developed in order to facilitate the high-resolution measurement of direct reactions in normal and inverse kinematics with stable and radioactive beams. GODDESS has been commissioned using a beam of 134Xe at 10 MeV/A, in a campaign of stable beam measurements. The measurement demonstrates the capabilities of GODDESS under radioactive beam conditions, and provides the first data on the single-neutron states in 135Xe, including previously unobserved states based on the orbitals above the N=82 shell closure.

Published
2017
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9. Solid phase extractive preconcentration coupled to gas chromatography- atomic emission detection for the determination of chlorophenols in water samples

Author

Elçi, Latif, Kolbe, Nina, Elçi, Şükrü G., and Anderson, J.T.

Subjects
Gas chromatography, Solid-phase extraction, Phase separation, Esters, Extraction, Derivatizations, Water analysis, Derivatization, Lakes, Phenols, Ferrocenecarboxylic acid esters, Acid ester, GC-AED, Solid phase extraction, Chlorophenols
Abstract

Solid-phase extraction (SPE) followed by derivatization and gas chromatography-atomic emission detection (GC-AED) was evaluated for the determination of five chlorophenols (CPs) in water samples. The derivatization was based on the esterification of phenolic compounds with ferrocenecarboxylic acid. The determination of the derivatized phenols was performed by GC-AED in the iron selective detection mode at 302 nm. The described method was tested on spiked water samples.The overall method gave detection limits of 1.6-3.7 ng L-1 and recoveries of 90.9-104.5% for the examined mono- to trichlorophenols in 10 mL water samples. The CPs extracted from a 10 mL water sample with SPE were concentrated into 100 μL of organic solvent, a preconcentration factor of 100. The method was applied to lake and tap water samples, and CP contents between 6 and 51 ng L-1 in lake water and between below the detection limit and 8 ng L-1 in tap water were found for different CPs. The method is quick, simple and gives excellent recoveries, limits of detection and standard deviations. © 2011 Elsevier B.V. All rights reserved.

Published
2011

10. The critical first year of life of walleye pollock (Gadus chalcogrammus) in the eastern Bering Sea: Implications for recruitment and future research.

Author

Duffy-Anderson, J.T., Barbeaux, S.J., Farley, E., Heintz, R., Horne, J.K., Parker-Stetter, S.L., Petrik, C., Siddon, E.C., and Smart, T.I.

Subjects
*WALLEYE pollock, *FISHERY management, *FISH spawning, *FISH growth, *FISH populations, *CLASSIFICATION of fish
Abstract

Walleye pollock ( Gadus chalcogrammus ) support a large commercial fishery in the eastern Bering Sea despite large interannual and decadal swings in population abundance. These oscillations challenge the fishery, prompting significant effort directed to understanding the species and its recruitment. Conceptual paradigms of walleye pollock recruitment recognize that understanding the factors affecting survivorship during the first year of life is central to understanding population fluctuation. Since the first year is critical to year-class strength of this key economically and ecologically important species, we review the state of knowledge of pre-recruit walleye pollock ecology in the eastern Bering Sea during this critical first-year period, including spawning, changes in vertical and horizontal distributions, feeding, growth, body condition, transport, and predation. We then critically examine the recruitment paradigms based on the component processes that have been proposed to explain mechanisms of recruitment control. We identify paradigm strengths or weaknesses relative to our current state of knowledge, discussing relevance and validity. Finally, we identify gaps in knowledge and propose areas of future research effort. [ABSTRACT FROM AUTHOR]

Published
2016
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11. Taxonomy of the early life stages of arrowtooth flounder (Atheresthes stomias) and Kamchatka flounder (A. evermanni) in the eastern Bering Sea, with notes on distribution and condition.

Author

De Forest, Lisa, Duffy-Anderson, J.T., Heintz, R.A., Matarese, A.C., Siddon, E.C., Smart, T.I., and Spies, I.B.

Subjects
*ARROWTOOTH flounder, *CLASSIFICATION of fish, *GEOGRAPHICAL distribution of fishes, *FISH ecology, *FISH morphology, FISH life cycles
Abstract

Arrowtooth flounder ( Atheresthes stomias ) and Kamchatka flounder ( A. evermanni ) are closely related flatfish species that co-occur in the eastern Bering Sea. As adults, arrowtooth flounder can be distinguished from Kamchatka flounder; however, larvae and early juveniles can only be indentified to the genus level due to morphological similarities. This has precluded studies of ecology for the early life stages of both species in the eastern Bering Sea. In this study, we developed a genetic technique to identify the larvae and early juveniles of the two species using mtDNA cytochrome oxidase subunit I (COI). Genetically identified specimens were then examined to determine a visual identification method based on pigment patterns and morphology. Specimens 6.0–12.0 mm SL and≥18.0 mm SL can be identified to the species level, but species identification of individuals 12.1–17.9 mm SL by visual means alone remains elusive. The distribution of larvae (<25.0 mm SL) of both arrowtooth flounder and Kamchatka flounder is similar in the eastern Bering Sea; however, juvenile (≥25.0 mm SL) Kamchatka flounder occur closer to the shelf break and in deeper water than juvenile arrowtooth flounder. Condition was determined for larvae and juveniles of each species by analyzing lipid content (%) and energy density (kJ/g dry mass). Kamchatka flounder larvae on average had higher lipid content than arrowtooth flounder larvae, but were also larger on average than arrowtooth flounder larvae in the summer. When corrected for length, both species had similar lipid content in the larval and juvenile stages. [ABSTRACT FROM AUTHOR]

Published
2014
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14. Distribution of early life Pacific halibut and comparison with Greenland halibut in the eastern Bering Sea.

Author

Sohn, D., Ciannelli, L., and Duffy-Anderson, J.T.

Subjects
*PACIFIC halibut, *GREENLAND halibut, *SPAWNING, *DISEASE progression
Abstract

Information about spatial distribution patterns during early life stages of fish is key to understanding dispersal trajectories and connectivity from spawning to nursery areas, as well as adult population dynamics. More than 30 years of historical field data were analyzed in order to describe the horizontal and vertical distributions of Pacific halibut early life stages (larvae to juveniles) in the eastern Bering Sea and to compare the distributions between Pacific halibut and Greenland halibut. Our results indicate that spawning for both species likely occurred in Bering and Pribilof canyons, along the slope between the two canyons, and on the eastern side of the Aleutian Islands during winter, but Pacific halibut spawning was protracted until early spring. Larvae of both species rose to shallower depths in the water column as they developed, but Pacific halibut larvae had an abrupt movement toward shallower depths. Geographically, larvae for both species either advected northwestward along the Bering Sea Slope or crossed onto the shelves from the slope regions, but the timing in Pacific halibut larval progression onto the shelf and along the slope was earlier than for Greenland halibut larvae. Pacific halibut juveniles (≤ 90 mm total length (TL)) were mostly found in the inner shelf between Bristol Bay and Nunivak Island, along the Alaskan Peninsula, and in the vicinity of the Pribilof Islands. The range of Greenland halibut juvenile (≤ 90 mm TL) distribution was expanded to south of the Pribilof Islands in the middle shelf and to the inner shelf. Although the two species share some attributes (i.e., spawning location) during early life stages, there were species-specific differences associated with spatial distribution (vertically and horizontally), timing differences in larval progression onto the shelves, pelagic larval duration, and juvenile nursery areas. [ABSTRACT FROM AUTHOR]

Published
2016
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16. Vertical distributions of the early life stages of walleye pollock (Theragra chalcogramma) in the Southeastern Bering Sea.

Author

Smart, T.I., Siddon, E.C., and Duffy-Anderson, J.T.

Subjects
*WALLEYE pollock, *ONTOGENY, *VERTICAL distribution (Aquatic biology), *THERMOCLINES (Oceanography), *LARVAE, *FOOD
Abstract

Abstract: The present study examines vertical distributions of the early life stages of walleye pollock (Theragra chalcogramma) in the Southeastern Bering Sea to assess ontogenetic and diel vertical migration in relation to development and habitat. Walleye pollock demonstrated a decrease in the depth of occurrence following hatching, indicating an ontogenetic change in vertical distribution. Eggs occurred deepest in the water column and early juveniles occurred shallowest. Vertical distributions were related to the date of collection, water column depth, and thermocline depth. Non-feeding stages (eggs and yolksac larvae, <4.5mm standard length [SL]) did not exhibit diel vertical migration. Feeding larvae exhibited diel vertical migration, although patterns varied between two feeding stages. Preflexion stage larvae (4.5–9.9mm SL) were concentrated between 10 and 20m during the day and deeper at night. Postflexion stage larvae (flexion and postflexion, 10.0–24.5mm SL) underwent regular diel migrations (0–20m, night; 10–40m, day). Low sample sizes limited our ability to assess diel vertical migration in early juveniles, but this stage tends to occur in the upper 20m of the water column, regardless of time of day. These results suggest that vertical distributions and diel migration potentially are driven by prey availability at sufficient light levels for preflexion larvae to feed and a trade-off between prey access and predation risk for postflexion larvae. Vertical distributions of eggs and preflexion larvae varied with habitat examined (on the continental shelf versus over the continental slope). Vertical distributions of walleye pollock eggs, yolksac larvae, and preflexion larvae in the Bering Sea are different from distributions in other ecosystems, which can impact transport and modeling efforts. [Copyright &y& Elsevier]

Published
2013
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