New Zealand Journal of Marine and Freshwater Research abstracts

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Three recently recorded Ostreopsis spp. (Dinophyceae) in New Zealand: temporal and regional distribution in the upper North Island from 1995 to 1997

F. H. CHANG

National Institute of Water & Atmospheric
 Research Ltd
P. O. Box 14 901, Kilbirnie
Wellington, New Zealand
email: h.chang@niwa.cri.nz

Y. SHIMIZU

Department of Pharmacognosy
 and Environmental Health Sciences
The University of Rhode Island
Kingston, RI 02881
United States

B. HAY

AquaBio Consultants Ltd
P. O. Box 560
Auckland 1, New Zealand

R. STEWART

National Institute of Water & Atmospheric
 Research Ltd
P. O. Box 14 901, Kilbirnie
Wellington, New Zealand

G. MACKAY
R. TASKER

National Institute of Water & Atmospheric
 Research Ltd
P. O. Box 1043
Whangarei, New Zealand

Abstract  Three species of epiphytic dinoflagellates--Ostreopsis siamensis, O. lenticularis, and O. ovata have recently been found on both the east and west coasts of the upper North Island, New Zealand. The morphological differences of all three Ostreopsis spp. have been studied with both light and scanning electron microscopes. Detailed studies of the inner face of the thecal wall of Ostreopsis siamensis revealed two types of trichocyst pores: small, simple pores and large multipore structures. The multipore structures apparently have not been previously reported. Surveys conducted during the period from November 1995 to April 1997 showed that all three Ostreopsis spp. were fairly widespread in northern New Zealand, and all three species were found to occur south of 35deg.S latitude. Cell concentrations of Ostreopsis spp. in summer were substantially higher than in early spring. There was also a clear regional difference in distribution; cell concentrations of the dominant species, O. siamensis, were greatest in Rarawa and Tokerau on the north-east coast. Other less abundant epiphytic species recorded during the same period included Prorocentrum lima, P. compressum, and Coolia monotis. These species were generally more sporadic in distribution than Ostreopsis spp.

Keywords  epiphytic dinoflagellates; Ostreopsis siamensis; O. lenticularis; O. ovata; Coolia monotis; Prorocentrum lima; cell abundance; temporal and regional distribution

M98061
Received 29 August 1998; accepted 27 September 1999

PDF file of entire paper: medium quality (1983K); (scanned from paper original: notes about this process)

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