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Ana Car1 ( HYPERLINK "mailto:ana.car@unidu.hr" ana.car@unidu.hr); Andrzej Witkowski2 ( HYPERLINK "mailto:witkowsk@univ.szczecin.pl" witkowsk@univ.szczecin.pl); S Ba w o m i r D o b o s z 2 ( H Y P E R L I N K " m a i l t o : s l a w o m i r . d o b o s z @ u n i v . s z c z e c i n . p l " s l a w o m i r . d o b o s z @ u n i v . s z c z e c i n . p l ) ; N e n a d J a s p r i c a 1 H Y P E R L I N K " m a i l t o : ( n e n a d . j a s p r i c a @ u n i d u . h r " ( n e n a d . j a s p r i c a @ u n i d u . h r ) ; T o m a s z P Bo c i Ds k i 3 ( H Y P E R L I N K " m a i l t o : t p l o c i n s k i @ i n m a t . pw.edu.pl" tplocinski@inmat.pw.edu.pl); Izabela Budniak3 (ibudniak@inmat.pw.edu.pl)
1Laboratory of Plankton Ecology and Population Genetics, Institute for Marine and Coastal Research, University of Dubrovnik, Dubrovnik, Croatia
2Department of Paleoceanology, Institute of Marine Sciences, University of Szczecin, Mickiewicza 18, Szczecin, Poland
3Faculty of Materials Science and Engineering, Warsaw University of Technology, Warsaw, Poland
The present study is being developed in the framework of a research project dealing with exotic seaweed Caulerpa racemosa on the coast of the Croatian Adriatic Sea. Preliminary analysis focus on diatom assemblages existing in surface layer of sediments and from stones sampled on the coast of the Adriatic Sea affected by Caulerpa racemosa. Studied samples were taken monthly during summer season 2009 in areas of Caulerpa racemosa near Dubrovnik (Southern Adriatic, location Orsula, 4237'49.45"N; 18 8'3.81"E) at the depth from 10 m to 14 m. Processed material (hydrogen peroxide treated) was studied by means of light (LM) and scanning electron microscopy (SEM). Identified assemblages of diatoms in sediment and on rocks were not as taxonomically rich and diverse as epiphytic diatoms on Caulerpa racemosa. The biraphid genera (Amphora and Diploneis) were represented by a high number of species, among others: Amphora acutiuscula Ktzing, Amphora bigibba var. interrupta Grunow, Amphora coffeaeformis (C.A. Agardh) Ktzing var. coffeaeformis, Diploneis smithii (Brbisson) Cleve, Diploneis weissflogii (A. Schmidt) Cleve. Monoraphid genus Cocconeis is known to be benthic with the raphe valves firmly attached to rocks, plants, animals or any other substrates. Cocconeis representatives constitute communities with high specimen abundance and species richness in the selected samples. Several forms of unclear taxonomical affinity were also observed. The group consist & 1 I Z z ~
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