The genus Cyelotella (Bacillariophyta) in Choctawhatchee Bay, Florida, with special reference to C. striata and C. choctawhatcheeana sp. nov.

Prasad, A. K. S. K.; Nienow, James A.; Livingston, Robert

doi:10.2216/i0031-8884-29-4-418.1

Cited by 61 publications

(34 citation statements)

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“…A high number of sequences from the marine diatom Thalassiosira was detected in all bottom water 18S rRNA gene clone libraries (21 to 45% of total diatom clones, Table 2), while sequences of the small centric diatom Cyclotella dominated (52%, Table 2) the diatom assemblage of the surface water collected during the peak of the ETM. Diatoms of the genus Cyclotella are found in both marine and freshwater environments but comprise distinct species in each system (Prasad et al 1990). Sequences of the freshwater representative C. atomus were detected in all samples, but an additional sequence of the marine species C. meneghiniana was uncovered in the pre-ETM bottom water clone library (accession numbers JF275104 and JF275105 for EUKA and EUKB reads).…”

Section: Resultsmentioning

confidence: 99%

Protist 18S rRNA gene sequence analysis reveals multiple sources of organic matter contributing to turbidity maxima of the Columbia River estuary

Herfort

Peterson²,

McCue

et al. 2011

Mar. Ecol. Prog. Ser.

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The Columbia River estuary is traditionally considered a detritus-based ecosystem fueled in summer by organic matter (OM) from expired freshwater diatoms. Since estuarine turbidity maxima (ETM) are sites of accumulation and transformation of this phytoplankton-derived OM, a project was undertaken to further characterize the ETM protist assemblage by collecting and analyzing bottom and surface water samples throughout an ETM event in August 2007. Biogeochemical, microscopic and molecular (18S rRNA gene clone libraries) analyses were performed. The data confirmed that the majority of the particulate OM in ETMs is derived from chl apoor particulate organic carbon tagged by DNA that is too damaged to be detected by molecular analysis. The phylogeny of the diatoms uncovered in our clone libraries demonstrated that the fresh, labile particulate OM fraction of the ETM has a marine origin. In addition, the detection of DNA from dead Myrionecta rubra cells from red tide bloom decay in the pre-ETM bottom waters suggests a transient autochthonous input into the OM pool of estuarine bottom waters. Furthermore, the discovery of Katablepharis sequences associated with the ETM event during a period when this flagellate is not abundant in the estuary water column indicates that ETMs enable the retention of this microeukaryote within the estuarine system. These findings challenge the traditional view of freshwater-derived detritus-based turbidity maxima, and imply multiple sources of OM to the Columbia River ETMs. These ETMs are thus sites of effective transformation of freshwater, marine and estuarine OM inputs, as well as refugia for ecologically relevant protists. KEY WORDS: Estuarine turbidity maxima · Columbia River estuary · Organic matterResale or republication not permitted without written consent of the publisher

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Section: Resultsmentioning

confidence: 99%

Protist 18S rRNA gene sequence analysis reveals multiple sources of organic matter contributing to turbidity maxima of the Columbia River estuary

Herfort

Peterson²,

McCue

et al. 2011

Mar. Ecol. Prog. Ser.

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“…Repetitive (three) 1-L whole-water phytoplankton samples were taken 15 cm below the surface and were immediately fixed in Lugol's solution in its acid version (Lovegrove 1960). Samples were analyzed by methods described by Prasad et al (1990), Prasad and Fryxell (1991), and Prasad and Livingston (1987). Zooplankton were taken with multiple tows using 202-lm nets run over various time periods.…”

Section: Biological Methodsmentioning

confidence: 99%

Phytoplankton Bloom Effects on a Gulf Estuary: Water Quality Changes and Biological Response

Livingston

2007

Ecological Applications

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Abstract. A long-term (16-year) study addressed the relationship of the trophic organization of a river-dominated Gulf of Mexico estuary (Perdido River-Bay system) with interannual trends of freshwater input, nutrient loading, and biological controlling features. The purpose of this study was to determine the long-term consequences of anthropogenic nutrient loading on a river estuarine system with an emphasis on the origin and impacts of a series of plankton blooms that were directly linked with nutrient loading to the Perdido drainage system. A multidisciplinary database was used to determine responses of plankton assemblages and associated coastal food webs to natural and anthropogenic nutrient loading. Orthophosphate and ammonia loading from a pulp mill into Elevenmile Creek and the bay generated a series of plankton blooms dominated by diatoms, raphidophytes, dinoflagellates, and cyanobacteria. Blooms followed species-specific seasonal patterns. Interannual phytoplankton trends were associated with nutrient loading and rainfall cycles. Blue-green algae blooms (Merismopedia tenuissima) in the receiving Elevenmile Creek were enhanced by drought conditions. There were statistical associations of reduced biological activity with the Merismopedia blooms. In the bay, initial diatom blooms were replaced by raphidophytes and dinoflagellates in time. Bloom effects on phytoplankton assemblages included initial reductions of species richness/diversity and direct/indirect replacement processes. Long-term changes of plankton blooms indicated complex adaptive processes that led to nonlinear responses to nutrient loading and time-based alterations of interspecific relationships. Blooms and related changes in phytoplankton composition were accompanied by loss of fish and invertebrate populations and altered food web processes. Raphidophyte (Heterosigma akashiwo) and dinoflagellate (Prorocentrum cordatum) blooms in the bay were statistically associated with reduced invertebrate and fish populations and disruptions of bay food webs. Reduced nutrient loading by the pulp mill resulted in diminished bay plankton blooms and partial recovery of infaunal macroinvertebrates. However, nutrient loading from a second source in the upper bay during later years was associated with increased bloom activity. This was added to reduced benthic invertebrate and fish assemblages in deeper bay areas affected by hypoxia caused by salinity stratification. Lower Perdido Bay was adversely affected by nonpoint source runoff from agricultural and urban sources with diminished water quality and loss of sediment organisms. Cumulative impacts due to anthropogenic nutrient loading from multiple sources and associated plankton blooms, along with altered physicochemical conditions due to a dredged opening at the bay terminus, resulted in widespread reductions of secondary productivity in Perdido Bay. Long-term trends of bay productivity are the result of interactions of natural climatological cycles and anthropogenic activities.

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“…The species was described by PRASAD et al (1990) from the Choctawhatchee Estuary from the Gulf of Mexico. Later it was newly described as C. hakanssoniae Wendker (WENDKER 1991) from the Schlei Estuary (Germany); this taxon is a synonym of C. choctawhatcheeana.…”

Section: Cyclotella Choctawhatcheeana a K S Prasad In Prasad Nienmentioning

confidence: 99%

Centric diatoms of large rivers and tributaries in Hungary: morphology and biogeographic distribution

Kiss

Klee²,

Éctor

et al. 2012

Acta Botanica Croatica

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Centric diatoms of 107 different Hungarian running waters were investigated. Among them the largest was the River Danube, from which more than one hundred plankton samples were analysed by scanning electron microscopy (SEM). Only one sample was analysed from creeks, which were the smallest running waters analysed in this study. There were also channels with slow currents flowing out of rivers or connecting different rivers. In total, 41 centric taxa belonging to 11 genera were found during this study. The average number of taxa found in a single watercourse was 7, the maximum 40 and the minimum 1. Cyclotella meneghiniana was the most frequently encountered species (present in 60% of sites). Twelve taxa were found in more than 20% of sites, 7 taxa between 5-10% and 6 taxa only in one site.

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The genus Cyelotella (Bacillariophyta) in Choctawhatchee Bay, Florida, with special reference to C. striata and C. choctawhatcheeana sp. nov.

Cited by 61 publications

References 0 publications

Protist 18S rRNA gene sequence analysis reveals multiple sources of organic matter contributing to turbidity maxima of the Columbia River estuary

Protist 18S rRNA gene sequence analysis reveals multiple sources of organic matter contributing to turbidity maxima of the Columbia River estuary

Phytoplankton Bloom Effects on a Gulf Estuary: Water Quality Changes and Biological Response

Centric diatoms of large rivers and tributaries in Hungary: morphology and biogeographic distribution

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