In situ release of mucus and DOC-lipid from the corals Acropora variabilis and Stylophora pistillata in different light regimes

Coral Reefs ◽  
1987 ◽  
Vol 6 (1) ◽  
pp. 35-42 ◽  
Author(s):  
C. J. Crossland
Keyword(s):  
Stylophora Pistillata ◽  
Light Regimes

scholarly journals Changes in Heterotrophic Picoplankton Community Structure after Induction of a Phytoplankton Bloom under Different Light Regimes

Diversity ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 195 ◽  
Author(s):  
Karayanni ◽  
Kormas ◽  
Moustaka-Gouni ◽  
Sommer
Keyword(s):  
Community Structure ◽  
Bacterial Community ◽  
Relative Abundance ◽  
Environmental Changes ◽  
Phytoplankton Bloom ◽  
Phytoplankton Growth ◽  
Light Regimes ◽  
Operational Taxonomic Units ◽  
Abundant Otus

Bacterial and archaeal diversity and succession were studied during a mesocosm experiment that investigated whether changing light regimes could affect the onset of phytoplankton blooms. For this, 454-pyrosequencing of the bacterial V1-V3 and archaeal V3-V9 16S rRNA regions was performed in samples collected from four mesocosms receiving different light irradiances at the beginning and the end of the experiment and during phytoplankton growth. In total, 46 bacterial operational taxonomic units (OTUs) with ≥1% relative abundance occurred (22–34 OTUs per mesocosm). OTUs were affiliated mainly with Rhodobacteraceae, Flavobacteriaceae and Alteromonadaceae. The four mesocosms shared 11 abundant OTUs. Dominance increased at the beginning of phytoplankton growth in all treatments and decreased thereafter. Maximum dominance was found in the mesocosms with high irradiances. Overall, specific bacterial OTUs had different responses in terms of relative abundance under in situ and high light intensities, and an early phytoplankton bloom resulted in different bacterial community structures both at high (family) and low (OTU) taxonomic levels. Thus, bacterial community structure and succession are affected by light regime, both directly and indirectly, which may have implications for an ecosystem’s response to environmental changes.

scholarly journals In vivo and in situ rhizosphere respiration in Acer saccharum and Betula alleghaniensis seedlings grown in contrasting light regimes

2006 ◽  
Vol 26 (7) ◽  
pp. 925-934 ◽  
Author(s):  
S. Delagrange ◽  
F. Huc ◽  
C. Messier ◽  
P. Dizengremel ◽  
E. Dreyer
Keyword(s):  
Acer Saccharum ◽  
Betula Alleghaniensis ◽  
Rhizosphere Respiration ◽  
Light Regimes

scholarly journals A method to disentangle and quantify host anabolic turnover in photosymbiotic holobionts with subcellular resolution

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Emma Gibbin ◽  
Guilhem Banc-Prandi ◽  
Maoz Fine ◽  
Arnaud Comment ◽  
Anders Meibom
Keyword(s):  
De Novo ◽  
Model Organism ◽  
Lipid Synthesis ◽  
Confounding Effect ◽  
Experimental Conditions ◽  
Stylophora Pistillata ◽  
Wide Range ◽  
Subcellular Resolution ◽  
Metabolic Exchange

AbstractA wide range of organisms host photosynthesizing symbionts. In these animals the metabolic exchange between host and symbionts has prevented in situ host anabolic turnover to be studied without the confounding effect of translocated photosynthates. Using the symbiotic coral Stylophora pistillata as a model organism and [1-13C]-pyruvate and [2,3-13C]-pyruvate in different incubation conditions (light, light + DCMU, and darkness), we employed NanoSIMS isotopic imaging to quantify host anabolism, with and without translocated metabolites from their photosynthesizing dinoflagellate symbionts. Under our experimental conditions, host de novo lipid synthesis accounted for ~40% of the total holobiont lipid reserve, and dinoflagellate recycling of metabolic 13CO2 enhanced host tissue 13C-enrichment by 13–22% in the epidermis, 40–58% in the gastrodermis, and 135–169% in host lipid bodies. Furthermore, we show that host anabolic turnover in different tissue structures differs, in a manner consistent with the localisation, function and cellular composition of these structures.

scholarly journals Spatial distribution of conspecific genotypes within chimeras of the branching coral Stylophora pistillata

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Gabriele Guerrini ◽  
Dor Shefy ◽  
Jacob Douek ◽  
Nadav Shashar ◽  
Tamar L. Goulet ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Common Species ◽  
Mixed Chimerism ◽  
Discrimination Power ◽  
Stylophora Pistillata ◽  
Unit Of Selection ◽  
Clonal Organisms ◽  
Physiological Outcomes

AbstractChimerism is a coalescence of conspecific genotypes. Although common in nature, fundamental knowledge, such as the spatial distribution of the genotypes within chimeras, is lacking. Hence, we investigated the spatial distribution of conspecific genotypes within the brooding coral Stylophora pistillata, a common species throughout the Indo-Pacific and Red Sea. From eight gravid colonies, we collected planula larvae that settled in aggregates, forming 2–3 partner chimeras. Coral chimeras grew in situ for up to 25 months. Nine chimeras (8 kin, 1 non-related genotypes) were sectioned into 7–17 fragments (6–26 polyps/fragment), and genotyped using eight microsatellite loci. The discrimination power of each microsatellite-locus was evaluated with 330 ‘artificial chimeras,’ made by mixing DNA from three different S. pistillata genotypes in pairwise combinations. In 68% of ‘artificial chimeras,’ the second genotype was detected if it constituted 5–30% of the chimera. Analyses of S. pistillata chimeras revealed that: (a) chimerism is a long-term state; (b) conspecifics were intermixed (not separate from one another); (c) disproportionate distribution of the conspecifics occurred; (d) cryptic chimerism (chimerism not detected via a given microsatellite) existed, alluding to the underestimation of chimerism in nature. Mixed chimerism may affect ecological/physiological outcomes for a chimera, especially in clonal organisms, and challenges the concept of individuality, affecting our understanding of the unit of selection.

scholarly journals Photoinhibition in shallow-water colonies of the coral Stylophora pistillata as measured in situ

2003 ◽  
Vol 48 (4) ◽  
pp. 1388-1393 ◽  
Author(s):  
Gidon Winters ◽  
Yossi Loya ◽  
Rüdiger Röttgers ◽  
Sven Beer
Keyword(s):  
Shallow Water ◽  
Stylophora Pistillata

Rendez vous with Saturn's rings

1984 ◽  
Vol 75 ◽  
pp. 743-759 ◽  
Author(s):  
Kerry T. Nock
Keyword(s):  
Solar Energy ◽  
Electric Propulsion ◽  
Power Source ◽  
Propulsion System ◽  
Low Thrust ◽  
Ring Plane ◽  
The Earth ◽  
Total Impulse ◽  
Saturn's Rings

ABSTRACTA mission to rendezvous with the rings of Saturn is studied with regard to science rationale and instrumentation and engineering feasibility and design. Future detailedin situexploration of the rings of Saturn will require spacecraft systems with enormous propulsive capability. NASA is currently studying the critical technologies for just such a system, called Nuclear Electric Propulsion (NEP). Electric propulsion is the only technology which can effectively provide the required total impulse for this demanding mission. Furthermore, the power source must be nuclear because the solar energy reaching Saturn is only 1% of that at the Earth. An important aspect of this mission is the ability of the low thrust propulsion system to continuously boost the spacecraft above the ring plane as it spirals in toward Saturn, thus enabling scientific measurements of ring particles from only a few kilometers.

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