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Tanta University (1985)

A study of the air-borne pollen and pollen rain and their relationships with vegetation of Omayed area’ North western Coastal desert Egypt

El-Hag-Omar, Hanan Hafz

Titre : A study of the air-borne pollen and pollen rain and their relationships with vegetation of Omayed area’ North western Coastal desert .Egypt

Auteur : El-Hag-Omar, Hanan Hafz.

Etablissement de soutenance : Tanta University

Grade : Master of Science (MSc) Botany 1985

Résumé
The present study includes analysis of air-borne pollen grains and pollen rain in Omayed area (western Mediterranean coastal region of Egypt). For this purpose a-Fluxage seven-day recording pollen trap was installed in the study area. Air sampling was undertaken weekly for two years (1982, 1983). The aim of the study is to provide information about pollen production, dissemination, and pollen preservation of species involved. Besides, this investigation provide basic information for future studies on the past vegetation and flora of the western Mediterranean coastal region of Egypt. Attention has also been given to the correlation between pollen grain concentration in the atmosphere and concurrent values of meteorological variables. Pollen grains related to 45 pollen types and 41 families beside 5 unknewons were recorded. Pollen grains of Gramineae, Caryophyllaceae, Chenopodiaceae, Compositae, Plantaginaceae, Polygonaceae, and Thymelaeaceae were recorded in high frequency. The total number of pollen grains recorded in 1983 was much higher than that in 1982. There were two pollen peaks for most of the families during the two years of study, the first during spring (March and May), and the second during autumn ( ovember and ecember). This bimodal timing apparently represents two seasons of pollination of different species, and refloatation of pollen by high velocity seasonal wind. The pollen grains encountered in the present study were classified into three main groups. Each group included different common pollen types characteristic of certain habitats : non-saline depressions, saline and marshy depressions, and inland ridges.

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