Valve of a spore of Thalassiosira
, a common circumpolar
coastal diatom, locally seen in greater
abundance near aquaculture sites.

backResearcher Profile

Irena Kaczmarska

Job Title: Professor of Biology
Employer: Mount Allison University
Place of Birth: Dluzniow, Przemyskie, Poland
High School attended: Liceum # VII, Krakow
Further Education: Jagellonian University, Krakow, Poland (M.Sc. - Hydrobiology;
Ph.D. - Paleolimnology).
Geographic focus of research: Atlantic, Pacific and Indian Oceans

Brief synopsis of current research:
In general, I am interested in how physical factors of the marine environment shape the composition, abundance and intra-annual dynamics of planktonic communities. I am searching for answers to these questions by examining interactions of environmental parameters and such phenomena as spore production, frequency of sexual reproduction and rate of reproductive success in diatoms. Although all coastal diatoms are of interest, I am focusing my research on such important coastal genera as Chaetoceros, Thalassiosira, and Pseudo-nitzschia. Geographically, most of my recent work is conducted in Passamaquoddy Bay, New Brunswick, but I occasionally work in more exotic locations (e.g., Equatorial Pacific). I am using both empirical (field and experimental) and theoretical (modeling) approaches for my research.
Thalassiosira taelata, a nanoplanktonic diatom from Passamaquoddy Bay, not yet reported from our region, probably due to very small size. Ornithocercus magnificus, an oceanic dinoflagellate from the Equatorial Pacific.
Two of the novel type of spores of Chaetoceros furcillatus that seem to be particularly common in warmer and less saline parts of Passamaquoddy Bay. Young auxospore of Pseudo-nitzschia multiseries. The auxospore in this species produces two new large cells, the products of sexual reproduction.

Mailing address:
Department of Biology, Mount Allison University, 63B York St., Sackville, N.B. E4L 1G7

Recent Publications:

Kaczmarska, I., T. A. Clair, J. M. Ehrman, S. L. MacDonald, D. Lean and K. E. Day. (in press). The effect of UV-B on phytoplankton populations in clear and brown temperate Canadian lakes. Limnology and Oceanography 45(5).

Hiltz, M., S. S. Bates and I. Kaczmarska. (in press). Effect of light:dark cycle regime and cell apical length on the sexual reproduction of the pennate diatom Pseudo-nitzschia multiseries (Bacillariophyceae) in culture. Phycologia.

Peterson, T. D., H. L. Schaefer, J. Martin and I. Kaczmarska. 1999. Chaetoceros furcillatus Bailey in the Canadian Maritimes. Botanica Marina 42: 253-263.

Kaczmarska, I. and L. L. Dowe. 1997. Reproductive biology of the red alga Polysiphonia lanosa (Ceramiales) in the Bay of Fundy, Canada. Marine Biology 128: 695-703.

Kaczmarska, I. and G. A. Fryxell. 1996. Alveus, gen. nov. (Bacillariaceae, Bacillariophyta), a heavily silicified diatom found in warm water oceans. Microscopy Research and Technique 33: 2-11.

I feel that it is about time that we learn as much about our oceans as we do about outer space.