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  • 1
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    Methylmercury in marine ecosystems : spatial patterns and processes of production, bioaccumulation, and biomagnification (2009)
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    Publikationsdatum: 2022-05-25
    Beschreibung: Author Posting. © International Association for Ecology and Health, 2008. This is the author's version of the work. It is posted here by permission of Springer for personal use, not for redistribution. The definitive version was published in EcoHealth 5 (2008): 399-408, doi:10.1007/s10393-008-0201-1.
    Beschreibung: The spatial variation of MeHg production, bioaccumulation and biomagnification in marine food webs is poorly characterized but critical to understanding the links between sources and higher trophic levels such as fish that are ultimately vectors of human and wildlife exposure. This paper discusses both large and local scale processes controlling Hg supply, methylation, bioaccumulation and transfer in marine ecosystems. While global estimates of Hg supply suggest important open ocean reservoirs of MeHg, only coastal processes and food webs are known sources of MeHg production, bioaccumulation, and bioadvection. The patterns observed to date suggest that not all sources and biotic receptors are spatially linked and that physical and ecological processes are important in transferring MeHg from source regions to bioaccumulation in marine food webs and from lower to higher trophic levels.
    Beschreibung: Supported by NIH Grant Number P42 ESO7373 from the NIEHS, SERDP funds from the Department of Defense, the ESSRF (Environmental Science Strategic Research Fund) DFO, Canada, Woods Hole Sea Grant, Woods Hole Coastal Ocean Institute, National Science Foundation, and RI-INBRE Grant #P20RR016457 from NCRR, NIH.
    Schlagwort(e): Methylmercury ; Bioaccumulation ; Trophic transfer ; Biomagnification ; Bioadvection
    Repository-Name: Woods Hole Open Access Server
    Materialart: Preprint
    Format: application/pdf
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  • 2
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    Fukushima 137Cs at the base of planktonic food webs off Japan (2016)
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    Publikationsdatum: 2022-05-25
    Beschreibung: © 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.
    Beschreibung: 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.
    Beschreibung: 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.
    Beschreibung: 2016-09-25
    Schlagwort(e): Fukushima ; Cesium ; Trophic transfer ; Phytoplankton ; Zooplankton
    Repository-Name: Woods Hole Open Access Server
    Materialart: Preprint
    Format: application/pdf
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  • 3
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    Copepod feeding strategy determines response to seawater viscosity: videography study of two calanoid copepod species (2020)
    Company of Biologists
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    Publikationsdatum: 2022-05-26
    Beschreibung: Author Posting. © Company of Biologists, 2020. This article is posted here by permission of Company of Biologists for personal use, not for redistribution. The definitive version was published in Journal of Experimental Biology (2020): jeb.220830, doi: 10.1242/jeb.220830.
    Beschreibung: Calanoid copepods, depending on feeding strategy, have different behavioral and biological controls on their movements, thereby responding differently to environmental conditions such as changes in seawater viscosity. To understand how copepod responses to environmental conditions are mediated through physical, physiological, and/or behavioral pathways, we used high-speed microvideography to compare two copepod species, Acartia hudsonica and Parvocalanus crassirostris, under different temperature, viscosity, and dietary conditions. Acartia hudsonica exhibited “sink and wait” feeding behavior and typically responded to changes in seawater viscosity; increased seawater viscosity reduced particle-capture behavior and decreased the size of the feeding current. In contrast, P. crassirostris continuously swam and did not show any behavioral or physical responses to changes in viscosity. Both species showed a physiological response to temperature, with reduced appendage beating frequency at cold temperatures, but this did not generally translate into effects on swimming speed, feeding flux, or active time. Both copepod species swam slower when feeding on diatom rather than dinoflagellate prey, showing that prey type mediates copepod behavior. These results differentiate species-specific behaviors and responses to environmental conditions, which may lead to better understanding of niche separation and latitudinal patterns in copepod feeding and movement strategies.
    Beschreibung: This study was supported by the National Science Foundation [OCE1634024 to N.F.; OCE-1433979 and OCE-1559062 to H.J.]; and by Stony Brook University [Graduate Council Fellowship and Turner Fellowship to A.S.T].
    Beschreibung: 2021-06-11
    Schlagwort(e): Copepods ; Zooplankton ; Seawater viscosity ; Feeding mechanism ; Micro-particle tracking velocimetry (µPTV)
    Repository-Name: Woods Hole Open Access Server
    Materialart: Article
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  • 4
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    Measurements of Cs134, Cs137, Ag110m, and K40 in zooplankton and small fish from the R/V Ka'imikai-o-Kanaloa KOK1108 cruise from June 06, 2011 to June 16, 2011 (Fukushima Radionuclide Levels project) (2012)
    Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu
    Details
    Publikationsdatum: 2022-05-26
    Beschreibung: Dataset: biological samples
    Beschreibung: This Establishing Radionuclide Levels in the Atlantic and Pacific Oceans Originating from the Fukushima Daiichi Nuclear Power Facility (Fukushima Radionuclide Levels) biological samples dataset includes the following data: Cs134, Cs137, Ag110m, and K40 in zooplankton and small fish. For a complete list of measurements, refer to the supplemental document 'Field_names.pdf', and a full dataset description' is included in the supplemental file 'Dataset_description.pdf'.
    Beschreibung: Gordon and Betty Moore Foundation (Moore) 3007, NSF Division of Ocean Sciences (NSF OCE) OCE-1136693
    Beschreibung: 2012-06-25
    Schlagwort(e): Fukushima Radionuclide Levels ; Bongo Net data ; Methot Net data
    Repository-Name: Woods Hole Open Access Server
    Materialart: Dataset
    Format: application/pdf
    Format: text/csv
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