Zvy Dubinsky

Zvy Dubinsky
Bar Ilan University | BIU · Faculty of Life Sciences

About

350
Publications
48,147
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12,925
Citations
Additional affiliations
January 2014 - present
University of Bologna
Position
  • coral ecophysiology, global climate change

Publications

Publications (350)
Article
Full-text available
Organisms that accumulate calcium carbonate structures are particularly vulnerable to ocean warming (OW) and ocean acidification (OA), potentially reducing the socioeconomic benefits of ecosystems reliant on these taxa. Since rising atmospheric CO2 is responsible for global warming and increasing ocean acidity, to correctly predict how OW and OA wi...
Article
Correlations between environmental parameters (depth temperature and solar radiation) and growth parameters (bulk skeletal density, linear extension rate and net calcification rate) of the solitary azooxanthellate coral, Caryophyllia inornata, were investigated along an 8° latitudinal gradient on the western Italian coasts. Net calcification rate c...
Article
Full-text available
In a littoral cave system, abiotic environmental properties, such as the intensity and spectral distribution of light, often change going from the exterior to the interior part of the cave, filtering the light and thus creating a deep-sea irradiance setting for marine flora. In this mini-review, we suggest that the supralittoral zone in littoral ca...
Book
This volume presents a broad panorama of the current status of research of invertebrate animals considered belonging to the phylum Cnidaria, such as hydra, jellyfish, sea anemone, and coral. In this book the Cnidarians are traced from the Earth�s primordial oceans, to their response to the warming and acidifying oceans. Due to the role of corals in...
Article
Full-text available
Light enhanced calcification (LEC) is a well-documented phenomenon in reef-building corals. The main mechanism proposed for LEC is that photosynthetic CO2 uptake by the algal symbionts elevates the pH and thus enhances calcification. We evaluated the role of light and of photosynthesis on calcification by assessing the response of the corals Porite...
Article
The ecology of scleractinian corals may be understood through comparisons between population demographic data and environmental parameters. Growth (growth constant and maximum size) and demographic parameters (population structure stability, instantaneous mortality rate, average age of individuals, percentage of immature individuals, age at maximum...
Article
Full-text available
Balanophyllia europaea is a shallow water solitary zooxanthellate coral, endemicto the Mediterranean Sea. Extensive field studies across a latitudinal temperaturegradient highlight detrimental effects of rising temperatures on its growth, demography,and skeletal characteristics, suggesting that depression of photosynthesis at hightemperatures might...
Article
Full-text available
The variety of reproductive processes and modes among coral species reflects their extraordinary regeneration ability. Scleractinians are an established example of clonal animals that can exhibit a mixed strategy of sexual and asexual reproduction to maintain their populations. This study provides the first description of the annual reproductive cy...
Article
Full-text available
Photosynthesis and growth in Dunaliella salina were significantly (P ≤ 0.01) enhanced under flashing light with a light–dark cycle tailored for the minimal activation of the violaxanthin cycle (VC), in comparison with cultures grown under constant illumination of the same time-integrated photon dose. The experiments were performed without using inh...
Article
Full-text available
Ocean acidification is predicted to impact ecosystems reliant on calcifying organisms, potentially reducing the socioeconomic benefits these habitats provide. Here we investigate the acclimation potential of stony corals living along a pH gradient caused by a Mediterranean CO2 vent that serves as a natural long-term experimental setting. We show th...
Article
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Reciprocal transplantation of Stylophora pistillata coral fragments between deep (30 m) and shallow sites (3 m) was conducted gradually and resulted with 100% survival. Photoacclimation of transplants at both depths showed two distinct phases: at the first phase, within 2 weeks, zooxanthellae density decreased below (at 3 m) and increased beyond (a...
Article
Full-text available
Correlations between solar radiation, sea surface temperature (SST), biometry, and population density were assessed along a wide latitudinal gradient in the non-zooxanthellate solitary coral Caryophyllia inornata. Biometric parameters were more strongly correlated with temperature than with solar radiation as in previous studies on Mediterranean so...
Article
An energy-input analysis of the life-cycle of microalgal cultivation systems was performed to study the oil-rich biomass production from fast-growing microalgae, for biodiesel production purposes. We estimated and compared the energy demands for the algal biomass cultivation in open-ponds (OP) with that required in closed-system photobioreactors (P...
Article
Scleractinian corals are a major source of biogenic calcium carbonate, yet the relationship between their skeletal microstructure and mechanical properties has been scarcely studied. In this work, the skeletons of two coral species: solitary Balanophyllia europaea and colonial Stylophora pistillata, were investigated by nanoindentation. The hardnes...
Article
Full-text available
An energy-input analysis of the life-cycle of microalgal cultivation systems was performed to study the oil-rich biomass production from fast-growing microalgae, for biodiesel production purposes. We estimated and compared the energy demands for the algal biomass cultivation in open-ponds (OP) with that required in closed-system photobioreactors (P...
Article
The violaxanthin cycle (VC) is an important mechanism for coping with the excessive photon flux operating in the photosynthetic apparatus in higher plants and algae under continuous illumination. However, the role of VC in the acclimation of photosynthesis to flashing illumination remains unclear. We report on the growth, VC dynamics, non-photochem...
Article
The relationship between reef-building corals and light-harvesting pigments of zooxanthellae (Symbiodinium sp.) has been acknowledged for decades. The photosynthetic activity of the algal endocellular symbionts may provide up to 90% of the energy needed for the coral holobiont. This relationship limits the bathymetric distribution of coral reefs to...
Article
The precipitation of calcium carbonate was carried out in the presence of the intraskeletal organic matrix (OM) extracted from Mediterranean corals. They were diverse in growth form and trophic strategy, Balanophyllia europaea and Leptopsammia pruvoti-solitary corals, only the first zooxanthellate coral-and Cladocora caespitosa and Astroides calycu...
Article
Full-text available
Off-line analytical pyrolysis combined with gas chromatography-mass spectroscopy (GC-MS), directly or after trimethylsilylation, along with infrared spectroscopy and amino acid analysis was applied for the first time to the characterization of the intra-skeletal organic matrix (OM) extracted from four Mediterranean hard corals. They were diverse in...
Article
Full-text available
We report here the successful combination of a two-step algal growth protocol, maximizing lipid yields with a single-step, and efficient extraction/transesterification procedure for the production of biodiesel. As a part of a global effort to find green renewable energy sources, our research focused on defining the optimal conditions for growing oi...
Article
Anthropogenic CO2 is a major driver of present environmental change in most ecosystems1, and the related ocean acidification is threatening marine biota2. With increasing pCO2, calcification rates of several species decrease3, although cases of upregulation are observed4. Here, we show that biological control over mineralization relates to species...
Article
During the past several decades, corals worldwide have been affected by severe bleaching events leading to wide-spread coral mortality triggered by global warming. The symbiotic Red Sea coral Stylophora pistillata from the Gulf of Eilat is considered an opportunistic ‘r’ strategist. It can thrive in relatively unstable environments and is considere...
Article
Full-text available
Investments at the organismal level towards reproduction and growth are often used as indicators of health. Understanding how such energy allocation varies with environmental conditions may, therefore, aid in predicting possible responses to global climatic change in the near future. For example, variations in seawater temperature may alter the phy...
Article
Full-text available
This is the first study exploring skeletal mechanical properties in temperate corals. The variation of skeletal mechanical properties with distance from the aboral pole, coral age, and population was investigated in the corals Balanophyllia europaea (zooxanthellate) and Leptopsammia pruvoti (non-zooxanthellate), collected at three sites along a wid...
Article
Phylogenetic analyses based on ITS1, ITS2 and tufA gene sequences confirmed the earlier described presence of three Caulerpa species, namely C. prolifera, C. mexicana and C. scalpelliformis, along the Israeli Mediterranean shores. These analyses also demonstrated that C. mexicana is indeed widespread in this area, and ruled out the presence of the...
Book
This volume is an indispensable addition to the multidisciplinary coverage of the science of the Mediterranean Sea. The editors have gathered leading authorities from the fields of Marine Biology, Ecology, paleoclimatology, Chemical and Physical Oceanography, Zoology, Botany, Aquatic Photosynthesis, Socioeconomics, Mariculture, Mediterranean Histor...
Article
Full-text available
The crystallization of skeletal aragonite by corals takes place in sites whose physical characteristics resemble those of a highly viscous sol or a gel. In these sites, biomolecules are secreted by calicoblast cells of the coral and some of them become entrapped in the skeleton. To explore the biomineralization process, a series of calcium carbonat...
Article
Mediterranean corals are a natural model for studying global warming, as the Mediterranean basin is expected to be one of the most affected regions and the increase of temperature is one of the greatest threats for coral survival. We have analyzed for the first time with Time Domain Nuclear Magnetic Resonance (TD-NMR) porosity and pore-space struct...
Article
We present here a novel application of photoacoustics to the monitoring and study of the physiological status of zooxanthellate corals. Until now, the method has only been applied in homogeneous phytoplankton cultures and field samples. Corals are among the world's most productive ecosystems because they host symbiotic dinoflagellates (zooxanthella...
Article
Scleractinian coral skeletons are composed mainly of aragonite in which a small percentage of organic matrix (OM) molecules is entrapped. It is well known that in corals the mineral deposition occurs in a biological confined nucleation site, but it is still unclear to what extent the calcification is controlled by OM molecules. Hence, the shape, si...
Article
We evaluated the effects of temperature and irradiance on growth and photosynthetic activity of Caulerpa prolifera, C. mexicana and C. scalpelliformis, all common species in the eastern Israeli Mediterranean. The growth of these species was negative at 15 °C but optimal at 23–26 °C, averaging 16% at 23 °C and 48% at 26 °C. For all species, the effe...
Article
Full-text available
Photoacclimation processes are crucial for the survival of all photosynthetic organisms in the photic zone. Changes in photosynthetic active radiation (PAR) are however simultaneous to changes in UV-B radiation. The influence of UV-B levels on bio-optical and physiological parameters of deep (30 m) corals from the species Stylophora pistillata and...
Article
Full-text available
The definition of antioxidants, given in 1995 by Halliwell and Gutteridge, stated that an antioxidant is “any substance that, when present at low concentrations compared with that of an oxidizable substrate, significantly delays or inhibits oxidation of that substrate” [1]. In 2007, Halliwell gave a more specific definition, stating that an antioxi...
Article
Full-text available
Morphological and physiological phenotypic plasticity of Stylophora pistil-lata in response to environmental changes was studied, with the objective of evaluating the impact of light and water flow as environmental factors. An in-situ artificial manipulation of combined light intensity and water flow was conducted, and the responses of several colo...
Article
Full-text available
In this study, we describe the seasonal patterns and the depth dependence of the underwater distribution of ultraviolet radiation (UVR) and photosynthetically active radiation (PAR) in the Gulf of Eilat (Aqaba). Our data show a remarkable seasonal variation in the daily irradiance dose that reaches the benthos, including seaweeds, turf algae, seagr...
Article
Full-text available
Introduction Correlations between sea surface temperature (SST) and growth parameters of the solitary azooxanthellate Dendrophylliid Leptopsammia pruvoti were assessed along an 8° latitudinal gradient on western Italian coasts (Mediterranean Sea), to check for possible negative effects of increasing temperature as the ones reported for a closely re...
Article
Full-text available
The efficiency of photorophs in storing light energy in products of photosynthesis, or the quantum yield of the process, determines the flux of energy into any ecosystem, and is readily affected by any stress factor, physiological or environmental. Hence it can serve as a sensitive reporter of imminent ecosystem perturbation. Current methods of est...
Chapter
Microalgae appear to have the potential to become a major source of oils and contribute significantly as a source of lipids for biofuel, with economically valuable by-products, such as fine chemicals for industry, glycerol, beta-carotene, vitamins, amino acids, carbohydrates, volatile substances, and a high protein residue suitable as poultry feed....
Article
While knowledge of the reproductive biology of tropical scleractinian corals is extensive, information from temperate zones is limited. The aim of this study is to describe the reproductive biology of Caryophyllia inornata, a temperate species, and to increase the understanding of the reproductive strategies of Mediterranean corals. Samples of C. i...
Article
Full-text available
The demographic traits of the solitary azooxanthellate scleractinian Leptopsammia pruvoti were determined in six populations on a sea surface temperature (SST) gradient along the western Italian coasts. This is the first investigation of the growth and demography characteristics of an azooxanthellate scleractinian along a natural SST gradient. Grow...
Data
Comparison between SST and temperature at 16 m depth during the indicated time interval. The left column shows correlation analyses between average daily SST and temperature at 16 m (left column) in the sampling sites for the indicated time interval. The right column shows SST (red line) and temperature at 16 m depth (black line) trends. n number o...
Article
Full-text available
Solar light penetrates deep into the clear water of oligotrophic oceans and may have both beneficial and destructive effects on marine phytoplankton. In oligotrophic waters worldwide, phytoplankton communities consist mostly of ultraphytoplankton of the groups Synechococcus and Prochlorococcus, which differ in their optical properties and, therefor...
Article
The skeleton of scleractinian corals is commonly believed to be composed entirely of aragonite due to the current Mg/Ca molar ratio of seawater, which thermodynamically favours the deposition of this polymorph of calcium carbonate (CaCO3). However, some studies have shown that other forms of CaCO3 such as calcite can be present in significant amoun...
Article
Full-text available
Caulerpa (Chlorophyta) species inhabiting intertidal and shallow subtidal areas along the Israeli Mediterranean shores (i.e., presence/absence) were surveyed on a seasonal basis from 2007 to 2009. We recorded the presence of three species: C. prolifera, C. mexicana, and C. scalpelliformis. These species were noticeable in autumn and inconspicuous d...
Chapter
Reef-building corals live in a mutualistic symbiosis with endocellular microalgae, the zooxanthellae that provide much of their animal host’s metabolic energy needs through translocation of photosynthate. That dependence sets a limit on the depth distribution of zooxanthellate corals, commonly restricting it to depths where light exceeds 0.5% of it...
Article
The correlations between skeletal parameters (bulk density, micro-density and porosity), coral age and sea surface temperature were assessed along a latitudinal gradient in the zooxanthellate coral Balanophyllia europaea and in the azooxanthellate coral Leptopsammia pruvoti. In both coral species, the variation of bulk density was more influenced b...
Article
Full-text available
Since the beginning of the 21st century, the Mediterranean shores of Israel have experienced invasions of several alien Indo-Pacific seaweed species. This phenomenon has been observed mainly on the northern Israeli Mediterranean shore, particularly near the port of Haifa. Here we report and dis-cuss the first record of the common Indo-Pacific seawe...
Article
Full-text available
Using a novel, pulsed micro-second time-resolved photoacoustic (PA) instrument, we measured thermal dissipation and energy storage (ES) in the intact cells of wild type (WT) Chlamydomonas reinhardtii, and mutants lacking either PSI or PSII reaction centers (RCs). On this time scale, the kinetic contributions of the thermal expansion component due t...
Article
Full-text available
Scleractinian coral skeletons are made mainly of calcium carbonate in the form of aragonite. The mineral deposition occurs in a biological confined environment, but it is still a theme of discussion to what extent the calcification occurs under biological or environmental control. Hence, the shape, size and organization of skeletal crystals from th...
Article
Full-text available
Photosynthesis rates in phytoplankton depend on light intensity and its spectral composition, however their relation changes with photoacclimation. During the photoacclimation process algal cells optimize their harvesting and utilization of available light through series of related physical, biophysical, biochemical and physiological changes. These...