Growth rates and ecology of coralline rhodoliths from the Ras Ghamila back reef lagoon, Red Sea

2016 ◽  
Vol 37 (4) ◽  
pp. 713-726 ◽  
Author(s):  
Annalisa Caragnano ◽  
Daniela Basso ◽  
Graziella Rodondi
Keyword(s):  
Red Sea ◽  
Growth Rates ◽  
Back Reef ◽  
Reef Lagoon

scholarly journals Survivorship and growth rates for some transplanted coral reef building species and their potential for coral reef rehabilitation in the Red Sea

2019 ◽  
Vol 23 (2) ◽  
pp. 183-193 ◽  
Author(s):  
Mostafa A. M. Mahmoud ◽  
Mahmoud A. Dar ◽  
Hussein N. M. Hussein ◽  
Mohamed E. A. El-Metwally ◽  
Mahmoud M. Maaty ◽  
...  
Keyword(s):  
Coral Reef ◽  
Red Sea ◽  
Growth Rates

Selective Elimination of Rooted Plants from a Tropical Seagrass Bed in a Back-Reef Lagoon: A Hypothesis Tested by Hurricane Wilma (2005)

2008 ◽  
Vol 241 ◽  
pp. 278-281 ◽  
Author(s):  
Brigitta I. van Tussenbroek ◽  
M. Guadalupe Barba Santos ◽  
Jent Kornelis van Dijk ◽  
S. N. Marisela Sanabria Alcaraz ◽  
M. Lourdes Téllez Calderón
Keyword(s):  
Back Reef ◽  
Seagrass Bed ◽  
Hurricane Wilma ◽  
Reef Lagoon ◽  
Selective Elimination

scholarly journals Picoplankton Diel Variability and Estimated Growth Rates in Epipelagic and Mesopelagic Waters of the Central Red Sea

2021 ◽  
Vol 8 ◽  
Author(s):  
Najwa Al-Otaibi ◽  
Francisca C. García ◽  
Xosé Anxelu G. Morán
Keyword(s):  
Cell Size ◽  
Red Sea ◽  
Growth Rates ◽  
Specific Growth ◽  
Nucleic Acid Content ◽  
Autotrophic Picoplankton ◽  
Heterotrophic Prokaryotes ◽  
Diel Variability ◽  
Specific Growth Rates

The diel variability of the abundance and cell size of picoplanktonic groups in the central Red Sea was monitored every 2 h in situ on 4 occasions (once per season) from 2015 to 2016. We distinguished Prochlorococcus, low (LF-Syn) and high (HF-Syn) fluorescence Synechococcus, small (Speuk) and large (Lpeuk) picoeukaryotes and two groups of heterotrophic prokaryotes of low (LNA) and high (HNA) nucleic acid content. The diel variability in abundance was less marked than in cell size and more apparent in autotrophs than heterotrophs. Specific growth rates were estimated by an empirical relationship from measurements obtained in bottle incubations of surface and deep samples collected in the winter compared with in situ variations in cell size over 24 h. Autotrophic picoplankton groups generally grew faster (0.23–0.77 d–1) than heterotrophic prokaryotes (0.12–0.50 d–1). Surface to 100 m depth-weighted specific growth rates displayed a clear seasonal pattern for Prochlorococcus, with maxima in winter (0.77 ± 0.07 d–1) and minima in fall (0.52 ± 0.07 d–1). The two groups of Synechococcus peaked in spring, with slightly higher growth rates of LF-Syn (0.57 ± 0.04 d–1) than HF-Syn (0.43 ± 0.04 d–1). Speuk and Lpeuk showed different seasonal patterns, with lower values of the former (0.27 ± 0.02 and 0.37 ± 0.04 d–1, respectively). HNA consistently outgrew LNA heterotrophic prokaryotes, with a higher growth in the epipelagic (0–200 m, 0.36 ± 0.03 d–1) than in the mesopelagic (200–700 m, 0.26 ± 0.03 d–1), while no differences were found for LNA cells (0.19 ± 0.03 d–1 and 0.17 ± 0.02 d–1, respectively). With all data pooled, the mean diel abundances of autotrophic picoplankton in the upper epipelagic and of HNA cells in the epipelagic and mesopelagic layers were significantly correlated with the specific growth rates estimated from cell size variations. Our high-resolution sampling dataset suggests that changes in growth rates underlie the noticeable seasonality of picoplankton recently described in these tropical waters.

scholarly journals Heterotrophic Bacterioplankton Growth and Physiological Properties in Red Sea Tropical Shallow Ecosystems With Different Dissolved Organic Matter Sources

2022 ◽  
Vol 12 ◽  
Author(s):  
Luis Silva ◽  
Maria Ll. Calleja ◽  
Tamara M. Huete-Stauffer ◽  
Snjezana Ivetic ◽  
Mohd I. Ansari ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Red Sea ◽  
Growth Rates ◽  
Bacterial Abundance ◽  
Specific Growth ◽  
Physiological Status ◽  
Top Down ◽  
Heterotrophic Bacterioplankton ◽  
Specific Growth Rates

Despite the key role of heterotrophic bacterioplankton in the biogeochemistry of tropical coastal waters, their dynamics have been poorly investigated in relation to the different dissolved organic matter (DOM) pools usually available. In this study we conducted four seasonal incubations of unfiltered and predator-free seawater (Community and Filtered treatment, respectively) at three Red Sea coastal sites characterized by different dominant DOM sources: Seagrass, Mangrove, and Phytoplankton. Bacterial abundance, growth and physiological status were assessed by flow cytometry and community composition by 16S rRNA gene amplicons. The Seagrass site showed the highest initial abundances (6.93 ± 0.30 × 105 cells mL–1), coincident with maximum DOC concentrations (>100 μmol C L–1), while growth rates peaked at the Mangrove site (1.11 ± 0.09 d–1) and were consistently higher in the Filtered treatment. The ratio between the Filtered and Community maximum bacterial abundance (a proxy for top-down control by protistan grazers) showed minimum values at the Seagrass site (1.05 ± 0.05) and maximum at the Phytoplankton site (1.24 ± 0.30), suggesting protistan grazing was higher in open waters, especially in the first half of the year. Since the Mangrove and Seagrass sites shared a similar bacterial diversity, the unexpected lack of bacterial response to predators removal at the latter site should be explained by differences in DOM characteristics. Nitrogen-rich DOM and fluorescent protein-like components were significantly associated with enhanced specific growth rates along the inshore-offshore gradient. Our study confirms the hypotheses that top–down factors control bacterial standing stocks while specific growth rates are bottom-up controlled in representative Red Sea shallow, oligotrophic ecosystems.

Siliciclastic—carbonate transitions in surface sediments of a back-reef lagoon north of Dar es Salaam (Tanzania)

1992 ◽  
Vol 78 (1-2) ◽  
pp. 49-57 ◽  
Author(s):  
Mario Fay ◽  
Desiderius C.P. Masalu ◽  
Alfred N.N. Muzuka
Keyword(s):  
Surface Sediments ◽  
Dar Es Salaam ◽  
Back Reef ◽  
Reef Lagoon

scholarly journals Growth rates of three symbiotic corals in the Red Sea

1997 ◽  
Vol 42 (8) ◽  
pp. 1814-1819 ◽  
Author(s):  
R. Vago ◽  
Z. Dubinsky ◽  
A. Genin ◽  
M. Ben-Zion ◽  
Z. Kizner
Keyword(s):  
Red Sea ◽  
Growth Rates

scholarly journals Growth rates of the giant clam Tridacna maxima (Röding, 1798) reared in cages in the Egyptian Red Sea

2019 ◽  
Vol 45 (1) ◽  
pp. 67-73
Author(s):  
T.A.A. Mohammed ◽  
M.H. Mohamed ◽  
R.M. Zamzamy ◽  
M.A.M. Mahmoud
Keyword(s):  
Red Sea ◽  
Growth Rates ◽  
Giant Clam ◽  
Tridacna Maxima

scholarly journals Hubungan Antara Fasies Batugamping Terhadap Kualitasnya Sebagai Bahan Baku Semen Portland Menurut Kadar CaO dan Senyawa Terkait di Kuari B dan C, PT Indocement Tunggal Prakarsa Tbk Unit Palimanan, Cirebon

2020 ◽  
Vol 3 (1) ◽  
pp. 1
Author(s):  
Ahmad Syauqi Hidayatillah ◽  
Tri Winarno ◽  
Rofiatun Khasanah
Keyword(s):  
Back Reef ◽  
X Ray ◽  
Reef Lagoon

Batugamping merupakan sumberdaya alam kategori bahan galian industri nonlogam. Penelitian mengenai fasies dan kualitas batugamping di PT Indocement Tunggal Prakarsa Tbk Unit Palimanan dilakukan untuk mengetahui hubungan antara jenis fasies terhadap kualitas batugamping sebagai bahan baku semen portland. Penelitian dilakukan dengan pengamatan sampel batugamping secara makroskopis dan mikroskopis terhadap 20 singkapan batugamping Kuari B dan C. Setiap singkapan batugamping dilakukan pengambilan sampel hand speciment untuk analisis kualitas kimia menggunakan X-Ray Fluorescence dan analisis fasies lebih spesifik. Hasil analisis menyatakan bahwa batugamping Kuari B diklasifikasikan menjadi 3 fasies, yaitu packstone, bafflestone, dan rudstone yang terbentuk pada zonasi fasies reef core dan back-reef lagoon. Batugamping Kuari C diklasifikasikan menjadi 4 fasies, yaitu mudstone, wackestone, packstone, dan grainstone yang terbentuk pada zonasi fasies back-reef lagoon. Analisis kualitas kimia menunjukkan bahwa 8 sampel batugamping Kuari B berkualitas baik (kadar CaO>49%), sedangkan pada Kuari C didapati sebanyak 8 sampel berkualitas baik (kadar CaO >49%), 2 sampel berkualitas sedang (kadar CaO 40-49%) dan 2 sampel berkualitas rendah (kadar CaO<40%). Hasil penelitian menunjukkan bahwa jenis fasies batugamping yang bersifat grain supported seperti grainstone, packstone, bafflestone, dan rudstone cenderung menghasilkan batugamping dengan kualitas baik, sedangkan fasies batugamping yang bersifat matrix supported seperti mudstone dan wackestone akan menghasilkan batugamping dengan kualitas yang lebih buruk.

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