Seasonal niche strategy of the bloom-forming dinoflagellate Heterocapsa triquetra

Litaker, R. Wayne; Tester, Patricia A.; Duke, CS; Kenney, B. E.; Pinckney, James L.; Ramus, J.

doi:10.3354/meps232045

Cited by 70 publications

(72 citation statements)

References 73 publications

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“…Growth-related metabolic pathways during the dinoflagellate bloom An algal bloom is often characterized by rapid growth of cells within a relatively short period of time (Pinckney et al, 1997), although it is recognized that there are numerous alternative conditions conducive to algal blooms, including a release of grazing pressure (Litaker et al, 2002). The relatively high concentrations of peridinin and abundance of dinoflagellates in the bloom sample is synonymous with high growth rates anticipated during the bloom event (Figure 2).…”

Section: Bloom Environmental Conditionsmentioning

confidence: 99%

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Molecular insights into a dinoflagellate bloom

et al. 2016

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In coastal waters worldwide, an increase in frequency and intensity of algal blooms has been attributed to eutrophication, with further increases predicted because of climate change. Yet, the cellular-level changes that occur in blooming algae remain largely unknown. Comparative metatranscriptomics was used to investigate the underlying molecular mechanisms associated with a dinoflagellate bloom in a eutrophied estuary. Here we show that under bloom conditions, there is increased expression of metabolic pathways indicative of rapidly growing cells, including energy production, carbon metabolism, transporters and synthesis of cellular membrane components. In addition, there is a prominence of highly expressed genes involved in the synthesis of membraneassociated molecules, including those for the production of glycosaminoglycans (GAGs), which may serve roles in nutrient acquisition and/or cell surface adhesion. Biotin and thiamine synthesis genes also increased expression along with several cobalamin biosynthesis-associated genes, suggesting processing of B 12 intermediates by dinoflagellates. The patterns in gene expression observed are consistent with bloom-forming dinoflagellates eliciting a cellular response to elevated nutrient demands and to promote interactions with their surrounding bacterial consortia, possibly in an effort to cultivate for enhancement of vitamin and nutrient exchanges and/or direct consumption. Our findings provide potential molecular targets for bloom characterization and management efforts.

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Section: Bloom Environmental Conditionsmentioning

confidence: 99%

“…Optimal temperature, salinity and light conditions may vary among bloom-forming algal species (Smayda, 1997;Litaker et al, 2002). Similarly, nutrient supply rates, concentrations and ratios can play significant roles in algal bloom dynamics in coastal waters Paerl, 2006).…”

Section: Introductionmentioning

confidence: 99%

Molecular insights into a dinoflagellate bloom

et al. 2016

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“…J.D.Dodge, which formed blooms at salinities of 14-28, 6-15, and 6-15, respectively. Other studies have confirmed that Skeletonema, H. triquetra, and Prorocentrum occur at salinities of 15->30, 10-30, and 6->30 (Brand 1984, Rijstenbil 1988, Marshall & Alden 1990, Mallin 1994, Litaker et al 2002, Shikata et al 2008. In the present study, Skeletonema spp., H. triquetra, and Prorocentrum sp.…”

Section: −1mentioning

confidence: 59%

“…dominated at the same salinity levels as those described above. Because of their species-specific salinity tolerances (Kirst 1989), PPL taxa appeared at different salinity levels in Lake Furen, as has been observed in many other estuaries (Brand 1984, Rijstenbil 1988, Marshall & Alden 1990, Mallin 1994, Litaker et al 2002, Shikata et al 2008, Carstensen et al 2015.…”

Section: −1mentioning

confidence: 99%

Spatial variability in an estuarine phytoplankton and suspended microphytobenthos community

Tsuji

Montani

2017

Plankton Benthos Res

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Estuarine material circulation depends on the presence of both phytoplankton and suspended microphytobenthos in the water column. However, the spatial distribution of suspended microphytobenthos and phytoplankton in estuaries is poorly understood. In this study, the abundance of suspended microphytobenthos and phytoplankton in the water column was determined along the salinity gradient in Lake Furen, Japan, from April to October 2015. Throughout the study period, surface and bottom salinity changed horizontally from <10 to >30. Phytoplankton was the main contributor to spatial increases in total cell abundance in mesohaline water as a result of the lake s hydrographic characteristics and water quality. The suspended microphytobenthos cell abundance in the surface and bottom water decreased with increasing salinity and was affected by the depth gradient. Suspended microphytobenthos cell abundances increased with depth (∼10 and 20% of total cell abundance in the surface and bottom water, respectively), which indicated that they were derived from microphytobenthos on the seafloor. The dominant suspended microphytobenthos taxa (Cocconeis spp. and Melosira varians) were mainly distributed in oligo-and mesohaline water, with peaks in mesohaline bottom water. In contrast, the dominant phytoplankton taxa (Skeletonema spp., Heterocapsa triquetra, and Prorocentrum spp.) were abundant at different salinity levels. The spatial distribution of dominant benthic and planktonic species in the water column was influenced by their tolerance to salinity. Our results suggest that suspended microphytobenthos contribute to microalgal communities in estuaries, especially those in bottom waters. Quantification of phytoplankton and suspended microphytobenthos will allow a better understanding of the effects of their spatial distribution on estuarine material circulation.

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“…Large blooms of the dinoflagellate, Heterocapsa triquetra, are a common feature of the NRE and other adjacent estuaries in winter Pinckney et al 1998;Litaker et al 2002), and these blooms may contribute . 50% of total annual phytoplankton production to the system Pinckney et al 1998).…”

Section: Discussionmentioning

confidence: 99%

Severe droughts reduce estuarine primary productivity with cascading effects on higher trophic levels

Wetz

Hutchinson

Lunetta

et al. 2011

Limnology & Oceanography

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Using a 10-yr time-series data set, we analyzed the effects of two severe droughts on water-quality and ecosystem processes in a temperate, eutrophic estuary (Neuse River Estuary, North Carolina). During the droughts, dissolved inorganic nitrogen concentrations were on average 46-68% lower than the long-term mean due to reduced riverine input. Phytoplankton productivity and biomass were slightly below average for most of the estuary during a spring-autumn drought in 2002, but were dramatically lower than average throughout the estuary during an autumn-winter drought in [2007][2008]. Droughts affected upper trophic levels through alteration of both habitat condition (i.e., bottom-water dissolved oxygen levels) and food availability. Bottomwater dissolved oxygen levels were near or slightly above average during the 2002 drought and during summer 2007. Concomitant with these modest improvements in bottom-water oxygen condition, fish kills were greatly reduced relative to the long-term average. Low-oxygen bottom-water conditions were more pronounced during summer 2008 in the latter stages of the 2007-2008 drought, and mesozooplankton abundances were eight-fold lower in summer 2008 than during nondrought years. Below-average mesozooplankton abundances persisted for well over 1 yr beyond cessation of the drought. Significant fish kills were observed in summer 2008 and 2009, perhaps due to the synergistic effects of hypoxia and reduced food availability. These results indicate that droughts can exert both ephemeral and prolonged multiyear influence on estuarine ecosystem processes and provide a glimpse into the future, when many regions of the world are predicted to face increased drought frequency and severity due to climate change.

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Seasonal niche strategy of the bloom-forming dinoflagellate Heterocapsa triquetra

Cited by 70 publications

References 73 publications

Molecular insights into a dinoflagellate bloom

Molecular insights into a dinoflagellate bloom

Spatial variability in an estuarine phytoplankton and suspended microphytobenthos community

Severe droughts reduce estuarine primary productivity with cascading effects on higher trophic levels

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