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  • 1
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    Vertical migration of dinoflagellates : model analysis of strategies, growth, and vertical distribution patterns (2011)
    Inter-Research
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © Inter-Research, 2007. This article is posted here by permission of Inter-Research for personal use, not for redistribution. The definitive version was published in Marine Ecology Progress Series 344 (2007): 49-61, doi:10.3354/meps06952.
    Description: Dinoflagellates demonstrate a variety of vertical migration patterns that presumably give them a competitive advantage when nutrients are depleted in the surface layer of stratified waters. In this study, a simple quota-based model was used to examine the relationships between the vertical migration pattern and internal nutritional status, and to assess how external environmental conditions, such as mixing layer depth (MLD) and internal waves, can influence these relationships. Dinoflagellates may form subsurface aggregations or conduct vertical migration (diel or non-diel) in response to their internal nutrient quota, but within a limited physiological parameter space. The model was implemented in a 1D (vertical) domain using an individual-based modeling approach, tracking the change in nutrient quota and the trajectory of many individual cells in a water column. The model shows that dinoflagellate cells might change from one vertical migration pattern to another when the external environmental conditions change. Using the average net growth rate as an index of fitness, 2 migration strategies, photo-/geotaxis vs. quota-based migration, were assessed with regard to MLD and internal wave regime. It was found that dinoflagellates might choose different migration strategies under different mixing/stratification regimes. In addition, under the same environmental conditions, different species might display unique vertical migration patterns due to inherent physiological differences. This study reveals the sensitivity of dinoflagellate vertical migration to biological and physical factors and offers possible explanations for the various vertical distributions and migration patterns observed in the field.
    Description: R.J. received support from the WHOI Penzance Assistant Scientist Fund and NOAA grant NA- 17RJ1223. The support for P.J.S.F. was from NSF grant OCE0220379 and ONR grant N00014-06-0304.
    Keywords: Dinoflagellates ; Vertical migration ; Model ; Nitrogen quota
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/pdf
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  • 2
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    Rapid climate-driven circulation changes threaten conservation of endangered North Atlantic right whales. (2019)
    Oceanography Society
    Details
    Publication Date: 2022-05-26
    Description: © The Author(s), 2019. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in [citation], doi:[doi]. Record, N. R., Runge, J. A., Pendleton, D. E., Balch, W. M., Davies, K. T. A., Pershing, A. J., Johnson, C. L., Stamieszkin, K., Ji, R., Feng, Z., Kraus, S. D., Kenney, R. D., Hudak, C. A., Mayo, C. A., Chen, C., Salisbury, J. E., & Thompson, C. R. S. Rapid climate-driven circulation changes threaten conservation of endangered North Atlantic right whales. Oceanography, 32(2), (2019): 162-169, doi: 10.5670/oceanog.2019.201.
    Description: As climate trends accelerate, ecosystems will be pushed rapidly into new states, reducing the potential efficacy of conservation strategies based on historical patterns. In the Gulf of Maine, climate-driven changes have restructured the ecosystem rapidly over the past decade. Changes in the Atlantic meridional overturning circulation have altered deepwater dynamics, driving warming rates twice as high as the fastest surface rates. This has had implications for the copepod Calanus finmarchicus, a critical food supply for the endangered North Atlantic right whale (Eubalaena glacialis). The oceanographic changes have driven a deviation in the seasonal foraging patterns of E. glacialis upon which conservation strategies depend, making the whales more vulnerable to ship strikes and gear entanglements. The effects of rapid climate-driven changes on a species at risk undermine current management approaches.
    Description: NASA NNX14AM77G and NNX17AI77G (NRR, WMB), NASA NNX16AG59G (NRR, KS), NSF OCE 1459096, 1459087 (NRR, JAR, CRST, CC), NSF OCE 1459133 (RJ, ZF), OCE-1655686 (RJ, ZF), USGS G16AC00237 (DEP), Maine Department of Marine Resources (JR, CRST), Marine Environmental Observation Prediction and Response Network of Centres of Excellence (KTAD). NOAA National Marine Fisheries Service; Massachusetts Environmental Trust; Division of Marine Fisheries, Commonwealth of Massachusetts (CH, CAM), Northeastern Regional Association of Coastal Ocean Observing Systems (CC).
    Repository Name: Woods Hole Open Access Server
    Type: Article
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