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  • 1
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    Otolith microstructure and trace elemental concentrations in juvenile Pacific bluefin tuna (Thunnus orientalis) caught off of Southern California in 2012 (2015)
    PANGAEA
    In:  Supplement to: Baumann, Hannes; Wells, R J D; Rooker, Jay R; Zhang, Saijin; Baumann, Zofia A; Madigan, Daniel J; Dewar, Heidi; Snodgrass, Owyn E; Fisher, Nicholas S (2015): Combining otolith microstructure and trace elemental analyses to infer the arrival of juvenile Pacific bluefin tuna in the California current ecosystem. ICES Journal of Marine Science, 72(7), 2128-2138, https://doi.org/10.1093/icesjms/fsv062
    Details
    Publication Date: 2023-02-12
    Description: We combined longitudinal analyses of otolith microstructure and trace elemental composition in ~ age 1-2 Pacific bluefin tuna (PBT, n = 24) for inferring the arrival of individuals in the California Current Large Marine Ecosystem (CCLME). Element:Ca ratios in transverse otolith sections (9-12 rows, triplicate ablations from coreprimordium to edge, ø50 µm) were quantified for eight elements: Li, Mg, Mn, Co, Cu, Zn, Sr, and Ba, which was followed by microstructure analysis to provide age estimates corresponding to each ablation spot. Age estimates from otoliths ranged from 328 to 498 days post hatch. The combined elemental signatures of four elements (Ba, Mg, Co, Cu) showed a significant increase at the otolith edge in approximately half of the individuals (30-60 days prior to catch). Given the different oceanographic properties of oligotrophic open Pacific vs. high nutrient, upwelling CCLME waters, this signal is consistent with the entry of the fish into the CCLME, which was estimated to occur primarily in July after a transoceanic migration of ~1.5-2.0 months.
    Keywords: Age; Barium; Calcium; California_current; California Current; Cobalt; Copper; Date; DATE/TIME; Distance; Fish, curved fork length; Identification; Inductively coupled plasma - mass spectrometry (ICP-MS); Lithium; Location; Magnesium; Manganese; Net; NET; Number; Observation; Otolith, Barium/Calcium ratio; Otolith, Cobalt/Calcium ratio; Otolith, Copper/Calcium ratio; Otolith, Lithium/Calcium ratio; Otolith, Magnesium/Calcium ratio; Otolith, Manganese/Calcium ratio; Otolith, Strontium/Calcium ratio; Otolith, Zinc/Calcium ratio; Ratio; Replicate; Species; Strontium; Time in days; Zinc
    Type: Dataset
    Format: text/tab-separated-values, 33920 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    Fukushima 137Cs at the base of planktonic food webs off Japan (2016)
    Details
    Publication Date: 2022-05-25
    Description: © The Author(s), 2015. This is the author's version of the work and is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Deep Sea Research Part I: Oceanographic Research Papers 106 (2015): 9-16, doi:10.1016/j.dsr.2015.09.006.
    Description: The potential bioaccumulation of 137Cs in marine food webs off Japan became a concern following the release of radioactive contaminants from the damaged Fukushima nuclear power plant into the coastal ocean. Previous studies suggest that 137Cs activities increase with trophic level in pelagic food webs, however, the bioaccumulation of 137Cs from seawater to primary producers, to zooplankton has not been evaluated in the field. Since phytoplankton are frequently the largest component of SPM (suspended particulate matter) we used SPM concentrations and particle-associated 137Cs to understand bioaccumulation of 137Cs in through trophic pathways in the field. We determined particle-associated 137Cs for samples collected at 20 m depth from six stations off Japan three months after the initial release from the Fukushima nuclear power plant. At 20 m SPM ranged from 0.65 to 1.60 mg L-1 and rapidly declined with depth. The ratios of particulate organic carbon to chlorophyll a suggested that phytoplankton comprised much of the SPM in these samples. 137Cs activities on particles accounted for on average 0.04% of the total 137Cs in seawater samples, and measured concentration factors of 137Cs on small suspended particles were comparatively low (~102). However, when 137Cs in crustacean zooplankton was derived based only on modeling dietary 137Cs uptake, we found predicted and measured 137Cs concentrations in good agreement. We therefore postulate the possibility that the dietary route of 137Cs bioaccumulation (i.e., phytoplankton ingestion) could be largely responsible for the measured levels in the copepod-dominated (%) zooplankton assemblages in Japanese coastal waters. Finally, our data did not support the notion that zooplankton grazing on phytoplankton results in a biomagnification of 137Cs.
    Description: This project was funded by the Gordon and Betty Moore Foundation through Grants GBMF3007 and GBMF 3423, and JSPS KAKENHI Grant-in-Aid for Scientific Research on Innovative Areas Grant Number 24110005.
    Description: 2016-09-25
    Keywords: Fukushima ; Cesium ; Trophic transfer ; Phytoplankton ; Zooplankton
    Repository Name: Woods Hole Open Access Server
    Type: Preprint
    Format: application/pdf
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    PAPER (OA)
  • 3
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    Fukushima-derived radionuclides in the ocean and biota off Japan (2012)
    National Academy of Sciences
    Details
    Publication Date: 2016-04-22
    Description: Citation only. Published in Proceedings of the National Academy of Sciences of the United States of America 109 (2012): 5984-5988, doi: 10.1073/pnas.1120794109
    Description: Funding was provided primarily from the Gordon and Betty Moore Foundation, and also the Chemical Oceanography Program of the US National Science Foundation, and WHOI.
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Location Call Number Limitation Availability
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    PAPER (OA)
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