We work in taxonomy of natural communities of phytoplankton. Our area of study is the Alboran Sea (Mediterranean Sea) where phytoplankton communities are often dominated by Pseudo-nitzschia. We have several papers published about time-series of phytoplankton. Specifically, we focused recently the distribution patterns of communities dominated by Pseudo-nitzschia. You can see these papers on my profile. On general, we found that this genera trends to be dominant close to lower limit of the mixed layer (20-40 m in depth) and at moderate concentrations of nutrients.
Hi Dr Mercado,
We work mainly on the taxonomy, molecular characterization, occurence and distribution of Pseudo-nitzschia in Malaysian waters (South China Sea, Straits of Malacca, Sulu Sea and Celebes Sea). Some of our colleague also work on the communities of phytoplankton, we have data since the year 2007 and from the data set we found that diatoms tend to dominate during dry season and replaced by dinoflagellates when it's rainy season. As you know we're at equator so we only have this two seasons.
From our preliminary data, we found higher cells density of Pseudo-nitzschia at surface water (around 1m), lower at 5m and 10m [Coastal water]. The adaptation of Pseudo-nitzschia in warm and cold water showed some differences. Not only that, we have also found more than 20 species of Pseudo-nitzschia from field samples (Bot. Mar., Submitted). The species richness of Pseudo-nitzschia in tropical waters is high. Recently, we described a new species, P. circumpora in P. pseudodelicatissima complex based on morphological and molecular data (Paper in J. Phycol.).
Pseudo-nitzschia pungens and P. brasiliana are widely distributed in our waters, however none of the strains that we obtained show positive result in domoic acid production. Although two of this species had been reported to be toxic in some countries from sub-temperate to temperate region.
Dear Hong Chang Lim
I used to work on marine diatoms. May I know what is your issue.
Hi Sundar, what group of diatoms are they?
Hi Dola, I'm working on marine diatom specifically Pseudo-nitzschia, a group of neurotoxin producer (domoic acid) responsible for Amnesic Shellfish Poisoning (ASP), what about yours work?
I worked on diversity, assemblage pattern and community dynamics of phytoplankton. I also cultured them in the lab.
Im a student of the ecology department from university of the basque country. I am in a phytoplankton laboratory, if you want to talk with somebody from my department tell my and i can make a contact.
I also know that we work on deep freshwater algae, and we have a collection made of more than 200 species. We do molecular analysis and taxonomy.
I have some research experiences on fresh water phytoplankton including Nitzschia..
Hi Dola, Ignacio, Hoque, do you happen to have culture of Pseudo-nitzschia in your lab, especially Pseudo-nitzschia pseudodelicatissima?
Hi Dola,
Penny Ajani is an expert on Australian Pseudo-nitzschia species- look her up on ResearchGate or contact through Macquarie University Dept of Biological Sciences. There is also Gustaff Hallegraeff at the University of Tasamania you can contact as well.
Kind regards,
Leanne Armand
Hi Dr Armand,
I know Penny personally and I did contact with her regarding P. pseudodelicatissima. She don't keep the cultures at the moment so I had asked for it from Nina.
Many thanks,
HongChang
Hi Hong Chang,
Great to know that you know each other. Maybe she will find some in the future that she can send your way. Cheerio.
Hi Dr Armand.
That would be great for collaboration. Hope that she will find some in near future.
We keep in touch.
HongChang
Hi Hong Chang Lim..
What aspect you want to know about the toxic diatom Pseudo-nitzschia??
We are currently working on community assemblages of micro algae as well as bloom dynamics along the Eastern Arabian Sea.
Hi Dr Padmakumar,
I actually quite interested on Pseudo-nitzschia pseudodelicatissima group now. By looking into their COX1 sequence and compare with LSU (D1-D3 domains) as well as ITS1-5.8S-ITS2 genes. Do you happens to have P. pseudodelicatissima/P. cuspidata cultures from your waters?
Hi, Hong Chang, I am doing taxonomy and species diversity of Pseudo-nitzschia along China coast. And near 100 strains are being cultured in my lab, including some P. pseudodelicatissima cpmplex strains. So far, we analyse the ITS sequence of these strains, as well as their ultrastructure features and ASP production. I have read your recent papers about Pseudo-nitzschia fron Malaysia waters, very nice and fruitful.
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