First records of two Padina species (Dictyotales, Phaeophyceae) from the Syrian coast (eastern Mediterranean) (pdf)

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First records of two Padina species (Dictyotales, Phaeophyceae) from the Syrian coast (eastern Mediterranean)

Arraj et al. Marine Biodiversity Records First records of two Padina species (Dictyotales, Phaeophyceae) from the Syrian coast (eastern Mediterranean) H. Arraj 0 H. Mayhoob 1 A. Abbas 1 0 Department of Marine Biology, High Institute of Marine Researches (HIMR), Tishreen University , Latakia , Syria 1 Department of Botany, Faculty of Science, Tishreen University , Latakia , Syria Padina ditristromatica and Padina boryana (Dictyotales, Phaeophyceae) are recorded for the first time from the Syrian coast (eastern Mediterranean). Padina ditristromatica has been previously reported in the west and the north east of the Mediterranean (Ni-Ni-Win et al. 2011) and Padina boryana from the southern Mediterranean (Geraldino et al. 2005). The morphological and anatomical characteristics have been used to confirm the new Padina spp. Dictyotales; Mediterranean Sea; Padina; Padina boryana; Padina ditristromatica; Phaeophyceae - Introduction Marine macrophytes have been thoroughly studied in the western Mediterranean, but there are fewer studies for the eastern Mediterranean (Giaccone 1968; Mayhoob 1976; UNEP/IUCN/GIS 1990) especially of the Phaeophycean algae (Mayhoob 1989, 2004; Mayhoob and Billard 1991; Mayhoob and Hatoum 2005). Specimens of the genus Padina Adanson were collected from Syria during a survey of Phaeophyceae. This genus includes about 27 species (Papenfuss 1977) in tropical and sub-tropical waters. In the Mediterranean Sea only 5 species have been reported: Padina pavonica (L) Thivy, P. boryana Thivy (Ribera et al. 1992), P. antillarum (Kützing) Piccone (P. tetrastromatica Hauck (Mayhoob 2004)), P. ditristromatica Ni-Ni-Win & H. and P. pavonicoides Ni-Ni-Win & H. Kawai (Ni-Ni-Win et al. 2011; Cormaci et al. 2012). Two of these are found on the Syrian coast: P. pavonica and P. tetrastromatica (Mayhoob 2004). This paper describes the recording of 2 species of the brown alga genus Padina (Dictyotales, Phaeophyceae) for the first time on the Syrian coast. Materials and methods Samples were collected from 2 sites: Al-madinah Alriadiah (35° 17ʹ 38.07″ N, 35° 55ʹ 23.71″ E) and the coast of Tal Socass (35° 17ʹ 54.86″ N, 35° 55ʹ 17.67″ E) in spring-summer 2014 from the lower intertidal zone at a depth of 2 m. The samples were washed thoroughly and preserved in a 4 % formalin-seawater solution for further investigation. Some of these samples were preserved in the form of herbarium sheets and given series numbers with the date of collection. They were kept in the herbarium of the High Institute of Marine Researches (Latakia, Syria). Transverse sections were made by freehand cutting with the help of shaving blades. Results Specimens examined Twenty preserved specimens of Padina boryana and 50 specimens of Padina ditristromatica were studied morphologically and anatomically. Padina boryana Thivy Morphology The thalli are yellowish brown in colour, and are moderately calcified on the lower surface (opposite the inrolled margin), especially at the stipe and lightly calcified on the upper surface (facing the inrolled margin). They are composed of © 2016 The Author(s). Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated. Fig. 1 Padina boryana Thivy: (a) Morphology of Padina boryana Thivy Sporophyte, (b) Transverse section of middle portion, showing 2 layers of cells, (c) Transverse section of basal portion, showing 2 layers of cells, (d) Surface view of the upper surface of the thallus, showing relationship of the hair lines (arrow) and the sporangial sori on the upper surface (triangle) Fig. 2 Padina ditristromatica Ni-Ni-Win & H. Kawai. (a) Morphology of Padina ditristromatica Ni-Ni-Win & H. Kawai female gametophyte, (b) Surface view of the lower surface of the thallus, showing relationship of the alternating hair lines and the reproductive sori on lower surface (arrow), (c) Transverse section of middle portion, showing mixture of 2 to 3 layers (arrows), (d) Mature obovate oogonium (triangle) with empty oogonia (arrow), (e) Mature oogonium, showing spherical shape, (f) Transverse section of marginal portion showing two cell layers Table 1 Comparing of the characteristics of five species of the Mediterranean Padina P. tetrastromatica 8-16 Greenish brown Yellowish brown Moderately calcified on the lower surface and lightly calcified on the upper surface Height (cm) Color Cell layers Indusium Arrangemant Position Arrangemant Length (mm) Breadth (mm) Alternate Alternate Alternate 7-20 (...truncated)