- Field survey on regeneration process of Avicennia marina growing along the Red Sea coast
（2012/2/24-2012/3/21）
Okayama University/Student, Ichido Yoshimori
Our study seeks to make clear the sustaining mechanism of a stand by the alternation of generations and the development process for Avicennia marina growing on the Red Sea coast. In our observation of A. marina growing on the Red Sea coast, we found A. marina in this area has two types of propagation systems, namely seedling propagation from seed and vegetative propagation from a reclining stem. In the low density or young stand, seedling propagation appeared to be commonly occurred but vegetative propagation was rare. On the other hand, in older stand consists of multi-stems trees, the sign of vegetative propagation was often found. Therefore the propagation systems may vary by the development status of stand, which could effect on the regeneration process of a stand. To achieve our objective, we performed some measurement(position and size of trees) and collection of leaf samples for DNA analysis in A. marina stand of Klanieb in Port Sudan , Sudan (N19°30'19.1", E37°16'50.1"). The survey was performed in partnership with technicians and researchers of faculty of marine science and fisheries, Red Sea University. We will analyze genetic relations among tree individuals within a stand in relation with tree size and location.
(Fig 1) Experimental plot in Klanieb (image from Google Earth).
A part of stand under natural condition, without artifitial disturbance like cammel grazing and cutting was selected as a target. We established a 20×50m experimental plot (red square). The measurement of trees posision and DNA sampling were carried out in the plot. Also the tree size (diameter, height and crown project area) was measured in a 10×30m quadrate in the plot.
(photo1)
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