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JOURNAL OF PLANKTON RESEARCH | VOLUME 3 | NUMBER 3 | PAGES 445-459 | 1981
© Oxford University Press

research-article

Distribution and ecology of the tintinnids in the Gulf of Elat (Aqaba), Red Sea

B. Kimor+ and B. Golandsky-Baras*

+Israel Oceanographic & Limnological Research Haifa, Israel *Open University Ramat Aviv, Tel-Aviv, Israel

Received on March 1, 1980; accepted on March 1, 1981 The tintinnids were studied as part of a microplankton investigation in the Gulf of Elat (Aqaba) (Red Sea) based on stratified samples collected at a reference station over a period of one year (1974–75). The results of this study were compared to the data obtained from the same area in the course of a previous survey (1970–71).

The ranges of abundance of the tintinnids as a whole and of the leading species of this group were determined from 0–50 m, 50–100 m and thereafter at intervals of 100 m down to a depth of 600 m for the samples collected during 1974–75. For those collected during 1970–71, the ranges of abundance were determined at two depths in vertical profiles over the water column from 50 and 200 m to the surface.

Two distinct peaks were noted, one in November-December and a second in February-March. A third minor peak occurred during June-July. The main winter peak of February-March occurred during the turnover period characterized by two uniform temperatures of 21°C or less throughout the water column. The seasonal and spatial distribution of the tintinnids closely followed that of the main phytoplankton groups, with greatest abundance recorded in the upper 100 m.

The species composition of the tintinnids during the annual peaks changed from season to season and from year to year. However, 8 species of a total of 42 recorded during the investigation were responsible for the annual peaks during both years. Among the environmental parameters monitored during the 1974–75 survey only the temperature factor could be related to the distribution pattern of one of the 8 leading species of tintinnids.

A summer submergence to deeper levels has been noted in regard to some of the prevailing species.


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