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First record of vertical rhizome growth in Zostera marina Mokos
1 Melita ,
Department of Maritime science, University of Zadar, Zadar, Croatia
INTRODUCTION Increased sediment loads in marine environments are caused by many different anthropogenic activities and more frequent storms due to climate change. Increases in sedimentation leads to increases in turbidity, which reduces penetration of light in the water. Deposited sediment buries the lower parts of the plant including photosynthetic tissues. Various seagrass species tolerate sediment burial differently (Cabaço et al., 2008). A plant can respond to burial with vertical or horizontal rhizome elongation. Vertical rhizome growth is interpreted as a mechanism selected to counteract the effects of burial. Vertical rhizome growth has been described in many seagrass species, but no published records exist of vertical rhizome growth in Zostera marina. Here we present the first record of vertical rhizome in Zostera marina. VERTICAL RHIZOME
Vertical rhizome is appearing in a vertical plane
Shoot with green tissue growing from the tip, along the same axis as the rhizome
Figure 1 a) and b). Vertical rhizome of Zostera marina
Rhizome with roots and shoot coming out of it
MATERIALS AND METHODS As a part of the research on effect of sediment relocation processes on the seagrass community in the Novigrad Sea, central Croatian Adriatic, seagrass samples were taken in summer, 2011. Novigrad sea is known to be an area with high sediment movement with 3 seagrass species occurring in that area: Zostera noltii, Zostera marina and Cymodocea nodosa. Three replicates of seagrass samples were collected by SCUBA divers at each of 8 different locations on 3 and 4,5 meter depth. Seagrass analysis included measurement Figure 2. Research area: central Croatian Adriatic, Novigrad Sea
of morphological characteristics (internode length and width).
RESULTS and DISCUSSION First record of vertical rhizome in Zostera marina Vertical rhizome bearing shoots as well as horizontal rhizome Mean vertical internode length=3.27±1.35 mm, maximum internode length=9 mm,