Diel vertical distributions of the red tide dinoflagellate Alexandrium fundyense in the Gulf of Maine

Townsend, David W.; Bennett, Stephanie L.; Thomas, Maura A.

doi:10.1016/j.dsr2.2005.06.027

Cited by 34 publications

(16 citation statements)

References 23 publications

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“…This might explain the existence of the 2 VM patterns for Alexandrium sp. in the Gulf of Maine at different times and locations of the surveys (Townsend et al 2005). In addition, the deepening of the MLD can also prevent cells from conducting DVM due to limits on cell swimming capabilities.…”

Section: Discussionmentioning

confidence: 99%

“…For example, Townsend et al (2001Townsend et al ( , 2005 reported both subsurface aggregations and bimodal distributions (indicative of AVM) of Alexandrium sp. in the Gulf of Maine when the MLD was between 20 and 30 m. A DVM signal was detected by Fauchot et al (2005) for the same species in the St. Lawrence estuary when the MLD was about 12 m. Laboratory experiments (MacIntyre et al 1997) have suggested that A. tamarense can change its VM strategies over a time scale of 1 to 2 d. These observations have been reproduced by our models and can be explained by several factors.…”

Section: Discussionmentioning

confidence: 99%

“…However, numerous studies have also suggested that the vertical profiles of many dinoflagellate species cannot be explained by a simple DVM pattern. For example, Townsend et al (2001Townsend et al ( , 2005 reported a bi-modal vertical distribution of Alexandrium sp. in the Gulf of Maine, with high concentrations near both the surface and the pycnocline regions, but low in between.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Vertical migration of dinoflagellates: model analysis of strategies, growth, and vertical distribution patterns

Ji¹,

Franks²

2007

Mar. Ecol. Prog. Ser.

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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. KEY WORDS: Dinoflagellates · Vertical migration · Model · Nitrogen quotaResale or republication not permitted without written consent of the publisher

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Vertical migration of dinoflagellates: model analysis of strategies, growth, and vertical distribution patterns

Ji¹,

Franks²

2007

Mar. Ecol. Prog. Ser.

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“…As an important functional component of the phytoplankton community, most of the dinoflagellates are capable of using their weak swimming abilities to perform diel vertical migration (DVM), which is a widespread phenomenon in both marine and freshwater habitats, and it has been the focus of most migration studies (Salonen and Rosenberg 2000;Beckmann and Hense 2004;Townsend et al 2005;Doblin et al 2006;Yamamoto and Nakahara 2006). In general, DVM behavior is known to facilitate the cells acquiring both high light and high nutrient levels, by maintaining near surface distributions by day and near pycnocline and nutricline depths by night (Ralston et al 2007;Ross and Sharples 2008).…”

Section: Introductionmentioning

confidence: 99%

Diel vertical migration of Peridiniopsis niei, Liu et al., a new species of dinoflagellates in an eutrophic bay of Three-Gorge Reservoir, China

Cai

Wang

et al. 2009

Aquat Ecol

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In spring, a typical dinoflagellate (Peridiniopsis niei Liu et al.) constitutes most of the phytoplankton biomass in most of eutrophic bay of Three-Gorge Reservoir (TGR, China). There are few field observations on vertical migration of the members of the genus Peridiniopsis. We studied diel vertical migration of the new species (Peridiniopsis niei) at sampling stations A and B in an eutrophic bay (Xiangxi Bay) of TGR during both day and night in March 2007. The present study suggests that vertical migration by Peridiniopsis niei is similar in nature to the migration patterns observed for other dinoflagellates. Solar irradiance incident was an important factor regulating the ascent and descent of Peridiniopsis niei. The vertical descent of Peridiniopsis niei during nighttime was restricted when the thermocline (Temperature gradient [1°C m -1 ) was present in the station B.

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“…In most ocean areas, the distribution of chlorophyllous pigments is uneven in the vertical directions although different specific species as well as different seasons and different sea areas, have different depth distribution pattern [6] . And there is a maximum value of chlorophyll concentration in the vertical direction [7][8][9] . The relationship between the total amounts and surface concentration of chlorophyll is pursued [10] , and some models have been built.…”

Section: Introductionmentioning

confidence: 99%

Chlorophyll-a Vertical Distribution of Yantai Coastal

Ma¹,

Wang²,

Wu³

et al. 2013

Proceedings of the 2013 International Conference on Remote Sensing,Environment and Transportation Engineering

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Abstract-Many researchers have studied the properties of chlorophyll-a vertical distribution in open ocean waters by now, and little is found for coastal waters. In the study, the chlorophyll-a vertical distribution of Yantai coastal waters is analyzed and a polynomial model is used to appraise the trend. Furthermore, the Gaussian model according to open waters is used to testify the practicability for coastal waters. The ratio between chlorophyll-a and turbidity is also discussed in order to predict the distribution trend. Finally, some conclusions could be achieved: A chlorophyll-a maximum in vertical direction could be seen and the maximum appears at about 6～8 meter depth in our research areas. The chlorophyll-a vertical distribution is similar to open ocean waters. Secondly, the euphotic layer is about 6~8 meter depth. Thirdly, under the depth of maximum chlorophyll-a concentration, chlorophyll-a concentration has negative correlation to the turbidity concentration in vertical direction. Based on above conclusion, the total chlorophyll-a could be achieved by calculating definite integrate of the simulation functions. This verifies the relationships of the surface and total chlorophyll-a concentration, which is the basis of primary production by the method of remote sensing.

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Diel vertical distributions of the red tide dinoflagellate Alexandrium fundyense in the Gulf of Maine

Cited by 34 publications

References 23 publications

Vertical migration of dinoflagellates: model analysis of strategies, growth, and vertical distribution patterns

Vertical migration of dinoflagellates: model analysis of strategies, growth, and vertical distribution patterns

Diel vertical migration of Peridiniopsis niei, Liu et al., a new species of dinoflagellates in an eutrophic bay of Three-Gorge Reservoir, China

Chlorophyll-a Vertical Distribution of Yantai Coastal

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