The present paper aims to describe the marine flora occurring on the continental shelf of Gökçeada Island (North Aegean) based on the review of the long-term researches which provided qualitative information on many taxa including Cyanobacteria, Chlorophyta, Ochrophyta, Rhodophyta and Tracheophyta.Eight species (Polysiphonia brevearticulata, Ceramium codii, Gymnothamnion elegans, Spermothamnion repens, Lophosiphonia cristata, Hydrolithon cruciatum, Leathesia marina, Caulerpa racemosa) and one variety (Caulerpa racemosa var.cylindracea) recorded during the present study are the new records for Gökçeada Island.The new recorded species belonging to Rhodophyta were found as opportunistic-filamentous and crustose epiphytic forms on Posidonia oceanica leaf blades during the years 2009-2016.The presence of Caulerpa racemosa, the Mediterranean invasive algae and its dispersal around the island proves the ecological threat on the coastal ecosystem of the island due to the touristic boat achorings and bottom trawling.Rhodophyta had the highest number of species dominated the macroalgal composition with 178 species followed by the contributions of Ochrophyta and Chlorophyta and Cyanobacteria with 78, 64 and 25 species, respectively.As for the marine phanerogams (Tracheophyta) that contribute as key ecosystems to the biological diversity were recorded as 1% of the systematic groups in the region presenting three genus (Cymodocea, Posidonia, Zostera) but covering vast areas.After all the future goals of this research are to develop a checklist of marine flora along the littoral zones of Gökçeada Island (North Aegean) presenting the last biodiversity situation and a detailed herbarium collection for the museum of Istanbul University Gökçeada Marine Research Department.
Isolated compounds 1 and 2 from Caulerpa cyclindracea inhibit the SARS-CoV-2 spike protein. Modelling studies suggest that the compounds may interfere with the spike-ACE2 interaction directly and also via an interaction with a spike allosteric site.
The nutritional properties of five different green macroalgae including Ulva rigida, Chaetomorpha linum, Codium fragile, Caulerpa prolifera and Caulerpa racemosa f. requienii from Turkey were investigated. The chemical composition of green macroalgae was varied, with ash, crude fiber, protein, lipid and carbohydrate ranging from 40.71 to 52.82%, 12.02-17.56%, 4.40-26.19%, 0.57-3.85% and 4.58-42.28% in dry weight, respectively. The fatty acid contents of the algae were quite variable and palmitic acid (C16) was found to be the primary fatty acid for all the samples with a value of more than 49.61%. Palmitic acid was followed by oleic acid, which is a monounsaturated fatty acid. This study revealed that green algae are rich in important soluble carbohydrates such as myo-inositol and glucose, health promoting unsaturated fatty acids (mainly oleic acid) and essential macroelements such as potassium, magnesium and microelements such as iron, zinc and selenium. The results of the current study contribute to a better understanding of macroalgae and encourage their use in food-related applications.
OKUDAN, E.S., DEMIR, V., KALKAN, E and KARHAN, S.U., 2011. Anchoring Damage on Seagrass-Meadows (Posidonia oceanica (L.) Delile) in Fethiye-Göcek Specially Protected Area (Eastern Mediterranean Sea, Turkey). In: Micallef, A. (ed.), MCRR3-2010 Conference Proceedings, Journal of Coastal Research, Special Issue, No. 61, pp. 417-420. Grosseto, Tuscany, Italy, ISSN 0749-0208.This paper aims to describe the impacts of anchoring on the structure of the seagrass Posidonia oceanica (L.) Delile meadows in Fethiye-Göcek Specially Protected Area (Eastern Mediterranean Sea, Turkey). This area, hosting five marinas with yacht capacity of 1210 and over 2500 yacht visitors per day in the summer season, is one of the important marine tourism centers in the Eastern Mediterranean zone. Besides, during summer months in particular, yachts and daily excursion/blue voyage tour boats have used most of the bays in the area as the pleasure travel and accommodation sites.In this work, we provide evidence that the anchoring had a negative effect on the meadow cover. Field surveys, including 581 scuba and 335 free dives revealed significant differences in the cover and conservation status of the meadow between areas characterized by the presence of the scars caused anchors and their chains and areas without them.
In this research, marine algae and seagrasses were investigated in the upper infralittoral zone of Hatay (Turkish Mediterranean coasts). A total of 377 algae and 5 seagrasses were determined. 30 of them belong to blue-green algae (Cyanophyceae), 201 to red algae [Rhodellophyceae (2),
Abstract In this study, marine algae and sea grasses in the upper infralittoral zone of the Black Sea coast of Giresun (Black Sea, Turkey) have been examined. Totally 193 taxa have been determined. 18 of them belong to blue-green bacteria (Cyanobacteria), 109 to red algae (Rhodophyta), 33 to brown algae (Ochrophyta), 30 to green algae (Chlorophyta) and 3 to sea grasses (Magnoliophyta). Erythrotrichia investiens, E. vexillaris, Lophosiphonia scopulorum and Spermothamnion repens var. flagelliferum are new records for Turkish shores of the Black Sea.
Sucul alanlarda yaşayan birincil üreticiler olan deniz algleri, önemleri nedeniyle birçok araştırmaya konu olmakla birlikte ilaç, kozmetik, gıda, yakıt ve tekstil endüstrilerinde önemli rol oynayan ökaryotik ve ötrofik organizmalardır. Makroalgler, potansiyel farmakolojik kullanımları olan birkaç makro besin, mikro besin ve diğer önemli biyolojik olarak aktif bileşikler (örneğin polifenoller, enzimler ve antibiyotikler) üretmesiyle bilinmektedir. Bu araştırmada, Codium fragile (Suringar) Hariot 1889’un metanol, etanol, aseton ve su ekstrelerinin kimyasal bileşimi, antimikrobiyal ve antioksidan aktiviteleri (3 yöntem ile), toplam fenolik (TPC) ve flavonoid (TFC) içeriklerini araştırmayı amaçlandı. LC-ESI-MS/MS analizleri gallik asit, 4-hidroksibenzaldehit, 4-hidroksibenzoik asit, p-kumarik asit, salisilik asit, biokanin A ve diosgenin içeren yedi bileşiğin tanımlanmasına izin verdi. Ekstrelerin TPC ve TFC değerleri sırasıyla 10,34±0,13-64,67±0,02 µg GAEs/mg ekstre ve 12,73±2,68-36,78±1,08 µg QEs/mg ekstre olarak hesaplandı. Metanol, etanol ve aseton ekstreleri gram negatif ve gram pozitif bakterilere karşı farklı seviyelerde aktivite göstermiştir (MİK: 3.125-1.562 mg/mL). Su ekstresi ABTS•+ (%70,43±14,85) ve DPPH• (%72,61±11,44) testlerine en yüksek aktiviteyi gösterirken, aseton ekstresi CUPRAC (absorbans: 0,60±0,15) testinde en yüksek aktiviteyi gösterdi. Elde ettiğimiz sonuçlar, C. fragile'in gıda koruyucuları ve diğer endüstriyel ve farmasötik alanlarda doğal bir biyoaktif madde kaynağı olarak değerlendirilebileceğini onaylamaktadır.
Analysis of plant growth regulators (PGRs) should be approached by considering their extremely low concentrations and serious interfering effects that result from the matrix of various plant tissues. In the current research, the separation and simultaneous determination of different classes of phytohormones in 14 seaweeds collected from Turkey seashores were achieved by using solid-phase extraction (SPE) followed by a rapid and sensitive liquid chromatography tandem mass detection method. OASIS HLB (Hydrophilic-Lipophilic Balance) cartridges were successfully used for SPE process to eliminate the matrix effect and enhance the PGRs including zeatin, benzyl amino purine, indole-3-acetic acid, abscisic acid and gibberellic acid within partially different polarities. Based on the optimized experimental conditions, the method presented excellent performance related to linearity (r, 0.9996-0.9999) within the ranges of 0.5-500 ng/mL, relative standard deviation values ((1.43-2.01) for intraday and (2.36-3.50) for interday)), the limit of detection (0.01-0.84 μg/L) and the limit of quantification (0.02-2.76 μg/L). The obtained results confirm that the SPE-liquid chromatography/tandem mass spectrometry method performed is highly effective and convenient for routine analyses of trace amounts of the tested phytohormones in seaweeds and any other plant samples as well.
Abstract In this research, have been studied marine algae in the upper infralittoral zone of the Bosphorus coasts of Istanbul (including Bosphorus) . A total of 244 taxon have been determined. 11 of them belong to blue-green bacteria (Cyanophyta), 127 to red algae (Rhodophyta), 46 to brown algae (Heterokontophyta), 60 to green algae (Chlorophyta) and 2 to flowering plants (Tracheophyta).
