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This paper describes the comprehensive morphological characteristics of ten Mastogloia Thwaites ex W. Smith (Bacillariophyceae) species, including, M. aquilegiae, M. baldjikiana, M. binotata, M. grunowii, M. ignorata, M. paradoxa, M. pumila, M. cf. regula, M. similis and M. vasta. Specimens were examined under the light microscope; eight of them are reported for the first time from Turkish coastal waters. Apart from the photo documentation, some information on the species geographical distribution patterns and the type of the substratum are also provided.

Spatio-temporal changes in taxonomic composition and structure of a diatom community were assessed between June 2006 and June 2007 at the intertidal zone of Homa lagoon, Izmir, Turkey. The communities were composed of a mixture of epilithic, epiphytic, epipsammic, and occasionally some pelagic diatoms. In total, 87 taxa belonging to 39 genera were identified, of which 39 were used as active taxa in the numerical analysis. The Shannon-Wiener diversity index (H ') values were quite variable, varying between 1.00 and 3.39 and correlated with both species richness (r = 0.93) and evenness (J '; r = 0.38). Cylindrotheca closterium, Halamphora veneta, Licmophora gracilis, L. lyngbyei, Navicula cryptocephala, N. cincta, and N. ramosissima var. mollis were the overall most abundant taxa throughout the sampling. The relationship between epilithic algal communities and 10 environmental variables was explored using canonical correspondence analysis. According to a Monte Carlo unrestricted permutation test, the silicate and ammonium concentrations were the most important variables in accounting for species distribution. KEY WORDS: Benthic diatom · Epilithic · Species diversity · Canonical correspondence analysis · Wetland area · Homa lagoon · TurkeyResale or republication not permitted without written consent of the publisher Aquat Biol 13: 233-241, 2011 2000), bivalve culture (Serdar & Lok 2007), and the physical and chemical properties of the lagoon (Unsal et al. 2000), but there is a gap in knowledge concerning epilithic diatoms. Few algological surveys have been conducted in the study area (Çolak Sabanci & Koray 2010, Çolak Sabanci et al. 2011. Epilithic diatom samples obtained in the present study have a wide spectrum of ecologically different types, including marine, brackish, and even freshwater affinities. In addition to this, samples also contained a mixture of forms growing on the stones themselves, on silt accumulated on the stones, and epiphytic forms on other algae, but here I will refer to this collective community as the epilithon. The aims of the present study were to describe the species composition of diatom assemblages, to determine which en vironmental factors ex plain the composition of epi lithic diatoms and to assess the response of com mon diatom taxa to these environmental variables. MATERIALS AND METHODS Study areaHoma Lagoon (38°33' 10" N, 26°49'50"E) is located 25 km to the northwest of the Gulf of Izmir and within the borders of the town of Menemen (Fig. 1). The lagoon is 7.4 km long and 3 km wide. The Gediz Delta region (20 400 ha), which includes the study area, consists of freshwater and salt water marshes (5000 ha), bays and saltpans (3300 ha), and lagoonal areas (Homa, 1800 ha; Cilazmak, 725 ha; Tas, 500 ha; Kir deniz, 450 ha) which makes it a typical Mediterranean delta ecosystem. The average rainfall and temperature of the area are 544.2 mm and 16.8°C (Ministry of Environment & Forestry 2007). Homa lagoon is one of the most important lagoons on the Aegean coast of Turkey, be...

The taxonomical composition of epilithic diatoms was investigated at intertidal zone of Homa lagoon, Aegean sea, Turkey. The stations are located in different littoral zones of the study area and they are different from each other in terms of hydrological respect. The samples contained a mixture of forms growing on the stones themselves, on silt accumulated on the stones and forms epiphytic on other algae, I will refer to this collective community as epilithon. Epilithic diatom species, which constitute the majority of the community were examined from obtained material. A total of 67 diatom taxa belonging to 34 genera were identified to the genus or species level. The species more frequently found in the samples were Cocconeis placentula, Cocconeis scutellum, Mastogloia pumila, Navicula cincta and Navicula crypyocephala var. veneta. Nine of the species identified during the research period seem to be previously unreported for Turkish coastal waters. Morphological characteristics of these species were given in detail information and original photographs.Keywords: Epilithic diatom, species identification, Homa lagoon, Aegean Sea, Eastern Mediterranean Sea. Kıyısal Lagündeki (Ege Denizi, Türkiye) Doğal Substratumda Bulunan Bentik Diyatomelerin Taksonomik Olarak İncelenmesi ÖzetEpilitik diyatomelerin tür kompozisyonu, Homa lagününün (Ege Denizi, Türkiye) kıyısal zonunda incelenmiştir. İstasyonlar, çalışma bölgesinin farklı kıyısal zonlarında yer almaktadır ve hidrolojik açıdan birbirlerinden farklıdır. Alınan örnekler, taş üzerinde bulunan diyatomeleri, taş üzerine biriken kum taneciklerine yapışarak yaşayan diyatomeleri ve diğer algler üzerinde bulunan epifitik diyatomeleri kapsamaktadır ve bu kommunite epiliton olarak ifade edilmektedir. Kommunitenin büyük çoğunluğunu oluşturan epilitik diyatome türleri toplanan materyalde incelenmiş, 34 genusa ait toplam 67 taxa, tür ve genus seviyesinde tanımlanmıştır. Cocconeis placentula, Cocconeis scutellum, Mastogloia pumila, Navicula cincta and Navicula crypyocephala var. veneta türleri örnekleme boyunca sık bulunan türlerdir. Araştırma döneminde saptanan türlerin 9 tanesi Türkiye kıyısal suları için daha önceden rapor edilmemiştir. Bu türlere ait detaylı morfolojik özellikler ve orijinal fotoğraflar çalışmaya eklenmiştir.

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