Morphology and ecology of Thalassiosira Cleve (Bacillariophyta) species rarely recorded in Brazilian coastal waters

Garcia, Marinês; Odebrecht, Clarisse

doi:10.1590/s1519-69842009000500009

Cited by 13 publications

(6 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The cruise occurred very shortly after the spring bloom at OSP and water temperatures were 2°C colder at OSP than at the other stations, which may have contributed to the absence of T. oceanica there. The presence of T. oceanica at the shallow coastal stations may seem out of place for this originally described oceanic species, but T. oceanica has previously been found in coastal environments (Harris et al, 1995; Aizawa et al, 2005; Garcia and Odebrecht, 2009). The small size of T. oceanica makes it challenging to identify by light microscopy, especially when larger diatoms are a more prominent component of biomass, thus it might be poorly enumerated in coastal stations.…”

Section: Discussionmentioning

confidence: 81%

“…ARISA analysis indicated that T. oceanica dominated Thalassiosira community composition in the open ocean stations associated with the leading edge of the Haida eddy (stations 13–15). Although T. oceanica often is considered to be a warm water species (Tomas, 1997; Kaczmarska et al, 2005), a number of studies report finding T. oceanica in waters as cold as 12°C (Harris et al, 1995; Aizawa et al, 2005; Garcia and Odebrecht, 2009) and the original description of cultivated T. oceanica maintained growth at 12°C (Hasle, 1983). The cruise occurred very shortly after the spring bloom at OSP and water temperatures were 2°C colder at OSP than at the other stations, which may have contributed to the absence of T. oceanica there.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Thalassiosira spp. community composition shifts in response to chemical and physical forcing in the northeast Pacific Ocean

Chappell¹,

Whitney²,

Haddock³

et al. 2013

Front. Microbiol.

View full text Add to dashboard Cite

Diatoms are genetically diverse unicellular photosynthetic eukaryotes that are key primary producers in the ocean. Many of the over 100 extant diatom species in the cosmopolitan genus Thalassiosira are difficult to distinguish in mixed populations using light microscopy. Here, we examine shifts in Thalassiosira spp. composition along a coastal to open ocean transect that encountered a 3-month-old Haida eddy in the northeast Pacific Ocean. To quantify shifts in Thalassiosira species composition, we developed a targeted automated ribosomal intergenic spacer analysis (ARISA) method to identify Thalassiosira spp. in environmental samples. As many specific fragment lengths are indicative of individual Thalassiosira spp., the ARISA method is a useful screening tool to identify changes in the relative abundance and distribution of specific species. The method also enabled us to assess changes in Thalassiosira community composition in response to chemical and physical forcing. Thalassiosira spp. community composition in the core of a 3-month-old Haida eddy remained largely (>80%) similar over a 2-week period, despite moving 24 km southwestward. Shifts in Thalassiosira species correlated with changes in dissolved iron (Fe) and temperature throughout the sampling period. Simultaneously tracking community composition and relative abundance of Thalassiosira species within the physical and chemical context they occurred allowed us to identify quantitative linkages between environmental conditions and community response.

show abstract

Section: Discussionmentioning

confidence: 81%

Section: Discussionmentioning

confidence: 99%

Thalassiosira spp. community composition shifts in response to chemical and physical forcing in the northeast Pacific Ocean

Chappell¹,

Whitney²,

Haddock³

et al. 2013

Front. Microbiol.

View full text Add to dashboard Cite

show abstract

“…T. oceanica is also an ecologically important diatom. It is found in many oceanic environments ( Aizawa et al , 2005 ; Garcia and Odebrecht, 2009 ; Harris et al , 1995 ; Kaczmarska et al , 2005 ; Tomas, 1997 ) including many samples from the low Fe waters of the northeast Pacific Ocean ( Chappell et al , 2013 ). The T. oceanica genes encoding the Fe-responsive flavodoxin ( FLDA1 ) and Fe-starvation induced protein three ( ISIP3 ) were selected as targets for molecular indicators of Fe status as they show a robust transcriptional response to Fe limitation (Chappell and Jenkins unpublished, Lommer et al , 2012 ).…”

Section: Introductionmentioning

confidence: 99%

Genetic indicators of iron limitation in wild populations of Thalassiosira oceanica from the northeast Pacific Ocean

et al. 2014

View full text Add to dashboard Cite

Assessing the iron (Fe) nutritional status of natural diatom populations has proven challenging as physiological and molecular responses can differ in diatoms of the same genus. We evaluated expression of genes encoding flavodoxin (FLDA1) and an Fe-starvation induced protein (ISIP3) as indicators of Fe limitation in the marine diatom Thalassiosira oceanica. The specificity of the response to Fe limitation was tested in cultures grown under Fe- and macronutrient-deficient conditions, as well as throughout the diurnal light cycle. Both genes showed a robust and specific response to Fe limitation in laboratory cultures and were detected in small volume samples collected from the northeast Pacific, demonstrating the sensitivity of this method. Overall, FLDA1 and ISIP3 expression was inversely related to Fe concentrations and offered insight into the Fe nutritional health of T. oceanica in the field. As T. oceanica is a species tolerant to low Fe, indications of Fe limitation in T. oceanica populations may serve as a proxy for severe Fe stress in the overall diatom community. At two shallow coastal locations, FLD1A and ISIP3 expression revealed Fe stress in areas where dissolved Fe concentrations were high, demonstrating that this approach may be powerful for identifying regions where Fe supply may not be biologically available.

show abstract

“…This species was originally described based on samples from San Francisco Bay (Mahood et al 1986). It has subsequently been recorded from the coastal and estuarine waters of Brazil (Garcia & Odebrecht 2009) and Korea (Park et al 2016) at salinities ranging from 20 to 32 psu. In the present study, it was a common, if not abundant, member of the SJR phytoplankton, occurring in 93 of the 109 samples processed.…”

Section: Discussionmentioning

confidence: 99%

Temporal and Spatial Changes in Water Quality and Phytoplankton Populations in the lower St. Johns River, Florida

Bielmyer-Fraser,

Bowers,

Courville

et al. 2023

Preprint

View full text Add to dashboard Cite

The St. Johns River (SJR) is a dynamic system, spanning 310 miles of Florida’s eastern coast and provides ecological, recreational, and commercial benefit for the state. The lower SJR basin, located near Jacksonville, forms an estuarine environment where tidal flow from the Atlantic Ocean mixes with freshwater moving through the river toward the ocean. Anthropogenic influences, such as increased development, dredging, and wastewater discharge from a variety of sources has changed the water quality in the river over past years. In this study, a variety of water quality parameters and a suite of metals were measured in water samples collected from eight sites in the lower SJR from 2019 to 2022, continued from previous work which documented these parameters in the river from 2017 to 2019. Aquatic communities such as phytoplankton can be indicative of river health, therefore, phytoplankton were collected from each site and the diatom component identified. The total number of taxa in each sample ranged from 60 to 190, with 25 taxa accounting for the majority (64%). The species Thalassiosira wongii was first discovered in the lower SJR during this study, previously documented from southern Brazil and the North Pacific. Like water chemistry, seasonal fluctuations in phytoplankton abundance and diversity were observed, with a relative abundance of Skeletonema costatum and Skeletonema subsalsum in times of lowered diversity. Further, decreased phytoplankton diversity correlated with increased metal contamination in the lower SJR. This study provides new information about the impact of human disturbance on biotic communities.

show abstract

Morphology and ecology of Thalassiosira Cleve (Bacillariophyta) species rarely recorded in Brazilian coastal waters

Cited by 13 publications

References 14 publications

Thalassiosira spp. community composition shifts in response to chemical and physical forcing in the northeast Pacific Ocean

Thalassiosira spp. community composition shifts in response to chemical and physical forcing in the northeast Pacific Ocean

Genetic indicators of iron limitation in wild populations of Thalassiosira oceanica from the northeast Pacific Ocean

Temporal and Spatial Changes in Water Quality and Phytoplankton Populations in the lower St. Johns River, Florida

Contact Info

Product

Resources

About