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The valve morphology of Mastogloia braunii Grunow, Mastogloia pumila Cleve, and Mastogloia vasta Hustedt were investigated using field material. Specimens for study were collected from Homa Lagoon, Izmir Bay, Turkey (4-29 degrees C; salinity 35%0-54%;)) as epipelic and epiphytic (Ulva lactuca L.). The valve morphological characteristics of the 3 sp...
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Context 1
... Lagoon (38°33′10″N, 26°49′50″E) is located 25 km north-west of the Gulf of İzmir within the borders of the town of Menemen (Figure 1). The lagoon has a length of 7.4 km and a width of 3 km. ...
Context 2
... to the results of one-way ANOVA, the morphological characterisation of Mastogloia species revealed some seasonal variability (Figures 4-12). Valve length, large partecta length, and total number of partecta in M. braunii show significant seasonal differences (Figures 4-6). ...
Context 3
... 2 parameters caused seasonal variation in the valve morphology of M. pumila. Seasonal differences in valve length and width and large partecta length of M. vasta were observed during the sampling (Figures 10-12). Valve 1.4 ...
Context 4
... lowest N/P ratio in March 2007 (2.00). The increase in the value of morphological characteristics during this period can be easily observed in Figures 10 and 11. The results of Pearson's correlation analysis showed that size variation increased with increasing silicate concentrations (r = 0.48). ...
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... Similarly, Mastogloia braunii almost doubled its density from the beginning to the end of the experiment. This is a typical brackish and epipsammic genus, previously observed on sandy sediments of the Caleri Lagoon of the Po Delta [24] whose occurrence was found to be positively correlated with phosphate [89]. ...
MOSE is a system of mobile gates engineered to temporarily isolate the Venice Lagoon from the Adriatic Sea and to protect the city from flooding during extreme high tides. Within the framework of the Venezia2021 program, we conducted two enclosure experiments in July 2019 (over 48 h) and October 2020 (over 28 h) by means of 18 mesocosms, in order to simulate the structural alterations that microphytobenthos (MPB) assemblages might encounter when the MOSE system is operational. The reduced hydrodynamics inside the mesocosms favored the deposition of organic matter and the sinking of cells from the water column towards the sediment. Consequently, MPB abundances increased over the course of both experiments and significant changes in the taxonomic composition of the community were recorded. Species richness increased in summer while it slightly decreased in autumn, this latter due to the increase in relative abundances of taxa favored by high organic loads and fine grain size. By coupling classical taxonomy with 18S rRNA gene metabarcoding we were able to obtain a comprehensive view of the whole community potential, highlighting the complementarity of these two approaches in ecological studies. Changes in the structure of MPB could affect sediment biostabilization, water turbidity and lagoon primary production.
... The composition of diatom populations grown on natural substrates has also been described, in both heavily anthropised and undisturbed areas (Facca et al., 2002a, b;Facca & Sfriso, 2007;Çolak Sabanci & Koray, 2010;Çolak Sabanci, , 2012a2012b, 2013Cibic & Facca, 2010 and references therein). Furthermore, studies have been conducted on epiphytic diatom communities on macroalgae and seagrasses (Car et al., 2012;De Stefano et al., 2000) and epizoic diatoms on animals (Romagnoli et al., 2007, 2014 andreferences therein). ...
Epilithic diatom community structures are compared among three locations of the eastern Adriatic Sea coast (Croatia), in the presence of two different invasive Caulerpa species, C. taxifolia and C. cylindracea, which have spread rapidly in the Mediterranean in the last decades. Forty samples were taken seasonally at three sites (island of Hvar, island of Mljet, and Dubrovnik) between November 2008 and October 2010. Light and electron microscopy examinations were used for qualitative analysis. Altogether 310 epilithic taxa belonging to 65 genera were identified. The highest number of these taxa belonged to Mastogloia (48) and Amphora (32), followed by Diploneis (24), Nitzschia (23), Navicula (22), and Cocconeis (19). A similar seasonal shift in growth form structure was observed for epilithic communities at the three sampling sites, where the number of erect group diatoms doubled (Hvar, Mljet) and tripled (Dubrovnik) in spring. Apart from erect forms, Dubrovnik and Mljet were characterised by adnate forms, while Hvar was characterised by tube-dwelling forms. The highest values of the Shannon-Wiener Diversity Index were recorded in autumn and ranged from 5.26 to 5.34. ANOSIM tests performed on species relative abundance data confirmed that the diatom communities differed significantly between the sampling sites, and that the differences were correlated with the presence of the two species of invasive macroalgae (Hvar – area of C. taxifolia; Mljet and Dubrovnik – areas of C. cylindracea). As revealed by SIMPER analyses, the group of taxa contributing the most to variance between diatom assemblages from sites of different invasive alga included Cocconeis scutellum var. scutellum, Rhopalodia pacifica, Navicula ramosissima, and Berkeleya rutilans. Although the spatial variation in communities may also reflect the effects of unmeasured environmental variables, the results suggest the possible influence of invasive seaweeds of the genus Caulerpa which may affect the habitat by competing with autochthonous algae. This study contributes to the knowledge of diatom diversity both at regional and at broader scales in these challenged environments.
... Yüzey alanı olarak oldukça büyük bir alanı kaplamakla birlikte, ortalama derinliği 0.5-1 m arasında değişen, en derin yerleri ise 1.5 m civarında olan sığ bir sucul alandır. Tuzluluğu mevsimlere ve yıllara göre oldukça değişkenlik göstermekle birlikte (‰ 38-100), tatlısu girişinin neredeyse yok denecek seviyede olması sebebiyle tuzluluk açısından tipik bir denizel ortam durumundadır (Sunlu ve Egemen, 1998;Sabancı, 2012 Yakalanan balıklar % 4'lük formaldehit ile tespit edilerek laboratuvara getirilmiş ve cinsiyet farkı gözetilmeksizin incelenmiştir. Balıkların boy ölçümleri 1 mm hassasiyetteki balık ölçüm cetveli, ağırlık ölçümü ise 0.01 g hassasiyetteki dijital terazi ile yapılmıştır. ...
Bu çalışmada, tatlısu ve tuzlusu karakterindeki iki
farklı ortamdan yakalanan Gümüş balığının boy-ağırlık ilişkisi ve kondisyonunun belirlenmesi ve
karşılaştırılması amaçlanmıştır. Balık örnekleri, Nisan 2015 döneminde, Marmara
Gölü ve Homa Lagünü’nden tül ığrıp ile yakalanmıştır. Marmara Gölü’nden 185 adet ve Homa Lagünü’nden
172 adet olmak üzere toplam 357 Gümüş balığı, cinsiyet farkı gözetilmeksizin
incelenmiştir. Total
boy ve ağırlık dağılımı Marmara Gölü’nde 5.6-8.2 cm ve 1.30-3.99 g, Homa Lagünü’nde ise 3.7-9.9 cm ve 0.32-6.30 g olarak belirlenmiştir.
Boy-ağırlık ilişkisi eşitlikleri Marmara Gölü için; W=0.0059L3.118 (sh(b)=0.068),
r=0.920, Homa Lagünü için; W=0.0077L2.925 (sh(b)=0.062), r=0.929
olarak hesaplanmıştır. Marmara Gölü örneklerinde pozitif allometrik, Homa
Lagünü örneklerinde ise izometrik büyüme modeli gözlenmiştir. Kondisyon faktörü
değerleri, Marmara Gölü örnekleri için 0.62-0.90, Homa Lagünü örnekleri içinse
0.38-0.94 aralığında değişim göstermiştir.
... Benthic diatoms of shallow coastal marine areas give a reliable contribution to the dynamics of aquatic ecosystems in terms of primary production, nutrient fluxes, and roles in the trophic web (MacIntyre et al., 1996;Totti, 2003). Communities of benthic diatoms can develop associated to different substrata, from the soft bottom (epipelon, epipsammon, and endopelon) (Totti, 2003) to rocks (epilithon) Çolak Sabancı and Koray, 2010), macroalgae and seagrasses (epiphyton) (Totti et al., 2009;Pennesi et al., 2011Pennesi et al., , 2012Pennesi et al., , 2013Çolak Sabancı, 2012;Majewska et al., 2013;Lobban and Pennesi, 2014), and animals (epizoon) (Round, 1971;Romagnoli et al., 2007). The peculiar microenvironments provided by marine animals, i.e. metabolite-rich and potentially grazer-free, are successfully exploited by several pennate diatom genera belonging to araphids, biraphids, and monoraphids (Round, 1981). ...
In this work, the valve fine structure, morphology, and dimensions of the epibenthic diatoms living on the marine hydroid Eudendrium racemosum Cavolini were investigated through SEM analysis. Hydroid samples were collected from the Ligurian Sea (Mediterranean Sea), from October 2002 to October 2003, with monthly frequency, allowing definition of the annual cycle of diatom communities. Following several taxonomic/systematic papers, this floristics paper documents 32 new records of diatoms (13 araphid, 17 biraphid, 2 monoraphid), which have been classified into different growth forms (adnate, erect, motile, tube-dwelling). Moreover, new information on morphologic data and biodiversity in the Mediterranean Sea are offered, indicating their ecological preferences.
... The diatom communities in similar climatic conditions were studied with respect to the seasonal influences of environmental factors of the systems in different countries (Barinova et al., 2011;Latif et al., 2013;Sabancı, 2012;Shams et al., 2012). ...
Diatoms are used for monitoring the environmental conditions of water. We have little information about centric diatoms in Turkish freshwaters. A total of 50 samples were collected from some springs and small streams of Türkmen Mountain. As a result, 7 species [Cyclotella meneghiniana Kützing, C. ocellata Pantocsek, Cyclostephanos dubius (Fricke) Round, Handmannia balatonis (Pantocsek) Kulikovskiy & Solak comb. nov., Melosira varians Agardh, Stephanodiscus hantzschii Grunow, and S. minutulus (Kützing)
Cleve & Möller] were identified, and we also suggest in this study that a new combination for Cyclotella balatonis Pantocsek should be Handmannia balatonis comb. nov. and for C. praetermissa Lund should be Handmannia praetermissa comb. nov.
Bu calismada Homa lagunu’nden (Ege Denizi, Turkiye) toplanan materyalden bentik diyatom turu Fogedia giffeniana’nin varligi rapor edilmistir. Turler isik mikroskopu altinda incelenerek, turun morfolojik karakteristlikleri ayrintili olarak aciklanmistir. Orijinal fotograflarin yaninda, ayrica turun cografik dagilimi ve bulundugu substratum hakkinda bilgi verilmistir
