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  • 1
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    Elemental signatures in otoliths of larval walleye pollock (Theragra chalcogramma) from the northeast Pacific Ocean (2021)
    In:  http://aquaticcommons.org/id/eprint/15087 | 403 | 2014-05-28 03:22:35 | 15087 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-07-02
    Description: The population structure of walleye pollock (Theragrachalcogramma) in the northeastern Pacific Ocean remains unknown. We examined elemental signatures in the otoliths of larval and juvenile pollock from locations in the BeringSea and Gulf of Alaska to determine if there were significant geographic variations in otolith compositionthat may be used as natural tags of population affinities. Otoliths were assayed by using both electron probemicroanalysis (EPMA) and laser ablation inductively coupled plasma mass spectrometry (ICP-MS). Elements measured at the nucleus of otoliths by EPMA and laser ablation ICP-MS differed significantly among locations. However, geographicgroupings identified by a multivariate statistical approach from EPMA and ICP-MS were dissimilar, indicating that the elements assayed by each technique were controlled by separate depositional processes within the endolymph. Elemental profiles across the pollock otoliths were generally consistent at distances up to 100 μm from the nucleus. At distances beyond 100 μm, profiles varied significantly but were remarkably consistent among individuals collected at each location. These data may indicate that larvae from various spawning locations are encountering water masses with differing physicochemicalproperties through their larval lives, and at approximately the same time. Although our results are promising, we require a better understanding of the mechanisms controlling otolith chemistry before it will be possibleto reconstruct dispersal pathways of larval pollock based on probe-based analyses of otolith geochemistry. Elemental signatures in otoliths of pollock may allow for the delineation of fine-scale population structure in pollock that has yet to be consistently revealed by using population genetic approaches.
    Keywords: Chemistry ; Fisheries
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 604-616
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  • 2
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    Spatial and temporal variation in elemental signatures of statoliths from the Patagonian longfin squid (Loligo gahi) (2005)
    National Research Council Canada
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © National Research Council Canada, 2004. This article is posted here by permission of National Research Council Canada for personal use, not for redistribution. The definitive version was published in Canadian Journal of Fisheries and Aquatic Sciences 61 (2004): 1212-1224, doi:10.1139/F04-075.
    Description: We quantified elemental signatures in statoliths of 718 Patagonian longfin squid (Loligo gahi) collected in the vicinity of the Falkland Islands (southwest Atlantic) and at sites on the Patagonian Shelf and coastal Peru. All squid were assigned to a spawning cohort by size, spawning condition, and back-calculated spawning date based on daily increments in statoliths. The remaining statolith was then analyzed for six elemental ratios (Mg/Ca, Mn/Ca, Sr/Ca, Cd/Ca, Ba/Ca, and Pb/Ca) using high-resolution inductively coupled plasma mass spectrometry (ICP-MS). Elemental concentrations in the statoliths were broadly similar to other biogenic aragonites. Differences in Sr/Ca ratios in statoliths among geographic locations were generally consistent with a negative correlation between Sr/Ca and temperature. Variations in statolith Cd/Ca and Ba/Ca values confirmed that during winter months, the squid were foraging deeper in the water column. Both Mg/Ca and Mn/Ca ratios in statoliths decreased with squid size, probably corresponding to a decrease in the contribution of the organic component of the statolith. Elemental signatures in the statoliths of L. gahi varied significantly geographically and between spring- and autumn-spawned cohorts, which must therefore have spent significant portions of their life histories in different environments.
    Description: The research was funded by the Falkland Islands Government and was also supported in part by National Science Foundation grants OCE-9871047 and OCE-0134998 to S.R.T.
    Keywords: Patagonian longfin squid ; Loligo gahi ; Sr/Ca ratios ; Mg/Ca ratios ; Mn/Ca ratios
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: 696571 bytes
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  • 3
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    Elemental signatures in otoliths of larval walleye pollock (Theragra chalcogramma) from the northeast Pacific Ocean (2005)
    U.S. Department of Commerce
    Details
    Publication Date: 2022-05-25
    Description: The contents of the Fishery Bulletin are not been copyrighted. The definitive version was published in Fishery Bulletin 102 (2004): 604-616.
    Description: The objectives of this study are to determine if larval walleye pollock from different geographic localities can be distinguished based on elemental signatures in their otoliths. By analyzing sagittal otoliths with both EPMA and laser ablation ICP-MS, we hoped to identify greater differences among locations than would have been possible by using either technique in isolation. If successful, the study may provide a powerful tool for determining stock structure and tracing migration pathways of walleye pollock in the north Pacific. These data could then be used by managers of one of the world's largest single species fisheries to direct the sustainable harvest of this considerable natural resource.
    Description: This work was funded by North Pacific Marine Research Program to KMB, SRT and KPS, and was supported in part by NSF grants OCE-9871047 and OCE-0134998 to SRT.
    Keywords: Stock identification ; Theragra chalcogramma ; Otolith geochemistry
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: 371705 bytes
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