Effects of cyanide on corals in relation to cyanide fishing on reefs

1997 ◽  
Vol 48 (6) ◽  
pp. 517 ◽  
Author(s):  
Ross J. Jones ◽  
Andrew L. Steven
Keyword(s):  
Sea Water ◽  
Pocillopora Damicornis ◽  
Symbiotic Algae ◽  
Exposure Levels ◽  
Fishing Practices ◽  
Zooxanthellate Corals

Small fragments of the zooxanthellate corals Pocillopora damicornis and Porites lichen were subjected to a range of cyanide concentrations for various times (i.e. to various cyanide doses). Doses encompassed those likely to be experienced by corals as a result of various cyanide fishing practices. Following the highest doses, corals died; after medium doses, they lost their zooxanthellae (symbiotic algae) resulting in a discolouration or ‘bleaching’; and after the lowest doses they lost zooxanthellae but not in sufficient numbers to cause noticeable discolouration. Respiratory rates of P. damicornis were inhibited by 10–90% following exposure to cyanide but recovered to pre-exposure levels within 1–2 h after transfer to clean sea water.

scholarly journals Long-term changes in the susceptibility of corals to thermal stress around Phuket, Thailand

2017 ◽  
Author(s):  
Lalita Putchim ◽  
Niphon Phongsuwan ◽  
Chaimongkol Yaemarunpattana ◽  
Nalinee Thongtham ◽  
Claudio Richter
Keyword(s):  
Thermal Stress ◽  
Life History Traits ◽  
Sea Water ◽  
Species Level ◽  
Pocillopora Damicornis ◽  
Rapid Adaptation ◽  
Long Term Changes ◽  
Belt Transect ◽  
Line Intercept

The bleaching susceptibility of 28 coral taxa around southern Phuket was examined in four natural major bleaching events, in 1991, 1995, 2010, and 2016. Surveys were conducted by line intercept and belt transect methods. All coral colonies were identified to genus or species-level and their pigmentation status was assessed as: (1) fully pigmented (i.e. no bleaching), (2) pale (loss of colour), (3) fully bleached, and (4) recently dead as a result of bleaching-induced mortality. Bleaching and mortality indices were calculated to compare bleaching susceptibility among coral taxa. In 2016 some of the formerly bleaching susceptible coral taxa (e.g. Acropora, Montipora, Echinopora, and Pocillopora damicornis) showed far greater tolerance to elevated sea water temperature than in previous years. In P. damicornis the higher bleaching resistance encompassed all sizes from juveniles (<5cm) to adults (>30cm). In contrast, some of the formerly bleaching-resistant corals (e.g. the massive Porites, Goniastrea, Dipsastraea, and Favites) became more susceptible to bleaching over repeated thermal stress events. Our results support the hypothesis that some of the fast-growing branching corals (Acropora, Montipora, and Pocillopora) may have life-history traits that lead to more rapid adaptation to a changed environment than certain growing massive species.

In Vivo Assimilation by Cod Muscle and Liver Tissue of Elemental Phosphorus from Polluted Sea Water

1970 ◽  
Vol 27 (6) ◽  
pp. 1131-1139 ◽  
Author(s):  
W. J. Dyer ◽  
D. F. Hiltz ◽  
R. G. Ackman ◽  
J. Hingley ◽  
G. L. Fletcher
Keyword(s):  
Lipid Content ◽  
Liver Tissue ◽  
White Muscle ◽  
Content Distribution ◽  
Sea Water ◽  
Elemental Phosphorus ◽  
Red Muscle ◽  
Seawater Environment ◽  
Exposure Levels

Cod rapidly assimilated elemental phosphorus from a seawater environment into their tissues. In a 16-hr exposure to a concentration of 20–80 ppb (parts per billion), phosphorus was concentrated a thousandfold in the liver (even more at lower exposure levels), from 10 to 25 times in white muscle, and about 50–100 times in red muscle. This distribution is roughly in proportion to lipid content. Distribution of the absorbed phosphorus is uniform throughout the white muscle of the fillet, thus facilitating sampling.

scholarly journals Rapid Recruitment of Symbiotic Algae into Developing Scleractinian Coral Tissues

2019 ◽  
Vol 7 (9) ◽  
pp. 306
Author(s):  
Bockel ◽  
Rinkevich
Keyword(s):  
Tissue Expansion ◽  
Outer Edge ◽  
Tissue Growth ◽  
Coral Tissue ◽  
Coral Host ◽  
Pocillopora Damicornis ◽  
Stylophora Pistillata ◽  
Symbiotic Algae ◽  
Glass Slides ◽  
Host Tissues

While the early acquisition of Symbiodiniaceae algae into coral host tissues has been extensively studied, the dynamics of the migration of algal cells into rapidly expanding coral tissues still lacks a systematic study. This work examined two Red Sea branching coral species, Pocillopora damicornis and Stylophora pistillata, as they were growing and expanding their tissue laterally on glass slides (January–June, 2014; 450 assays; five colonies/species). We measured lateral tissue expansion rates and intratissue dinoflagellate migration rates. Tissue growth rates significantly differed between the two species (with Stylophora faster than Pocillopora), but not between genotypes within a species. Using a “flow-through coral chamber” under the microscope, the migration of dinoflagellates towards the peripheral edges of the expanding coral tissue was quantified. On a five-day timescale, the density of the endosymbiotic dinoflagellate cells, presenting within a 90 µm region of expanding coral tissue (outer edge), increased by a factor of 23.6 for Pocillopora (from 1.2 × 104 cells cm‒² to 2.4 × 105 cells cm‒²) and by a factor of 6.8 for Stylophora (from 3.6 × 104 cells cm‒² to 2.4 × 105 cells cm‒²). The infection rates were fast (5.2 × 104 and 4.1 × 104 algal cells day-1 cm‒², respectively), further providing evidence of an as yet unknown pathway of algal movement within coral host tissues.

Carbonate Dehydratase in Marine Organisms of the Great Barrier Reef

1976 ◽  
Vol 3 (1) ◽  
pp. 113 ◽  
Author(s):  
D Graham ◽  
RM Smillie
Keyword(s):  
Calcium Carbonate ◽  
Great Barrier Reef ◽  
Sea Water ◽  
Carbonic Anhydrase Activity ◽  
Enzymic Activity ◽  
Barrier Reef ◽  
Pocillopora Damicornis ◽  
Blue Green Algae ◽  
Calcium Carbonate Deposition ◽  
Dehydratase Activity

Carbonate dehydratase (EC 4.2.1.1, other name 'carbonic anhydrase') activity was found in 28 of 29 species of marine algae and angiosperms and in a mixed culture of phytoplankton collected in the vicinity of Lizard Island on the Great Barrier Reef of Australia. The species included 13 member- of the Chlorophyta, 4 of the Phaeophyta, 7 of the Rhodophyta, 2 of the Cyanophyta and 3 subs merged marine angiosperms. One of the two blue-green algae showed no detectable enzymic activity. The levels of activity ranged from 100 to 4800 units per milligram chlorophyll and were generally comparable with those of terrestrial angiosperms based on chlorophyll content, but were only a small fraction when compared on the basis of fresh weight. Culture of the green alga Chlorodesmis fastigiata in 'CO2-free' sea water (1.4 mg CO2 per litre) for 4 h did not lead to an induction of carbonate dehydratase activity. Some of the species of algae producing calcium carbonate contained the highest activities recorded but others had low activities. A correlation between high carbonate dehydratase activity and calcium carbonate deposition could not be adduced. Symbiotic zooxanthellae (Gymnodinium microadriaticum) of the hard coral Pocillopora damicornis and the clam Tridacna maxima also contained carbonate dehydratase (940 and 340 units per milligram chlorophyll, respectively). The host tissues contained about five times the activity of their respective zooxanthellae.

scholarly journals Coral micro- and macro-morphological skeletal properties in response to life-long acclimatization at CO2 vents in Papua New Guinea

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Fiorella Prada ◽  
Leonardo Brizi ◽  
Silvia Franzellitti ◽  
Stefano Mengoli ◽  
Simona Fermani ◽  
...  
Keyword(s):  
Papua New Guinea ◽  
Volume Fraction ◽  
Organic Matrix ◽  
New Guinea ◽  
Pocillopora Damicornis ◽  
Environmental Pressures ◽  
Seawater Ph ◽  
Skeletal Phenotype ◽  
And Control ◽  
Zooxanthellate Corals

AbstractThis study investigates the effects of long-term exposure to OA on skeletal parameters of four tropical zooxanthellate corals naturally living at CO2 seeps and adjacent control sites from two locations (Dobu and Upa Upasina) in the Papua New Guinea underwater volcanic vent system. The seeps are characterized by seawater pH values ranging from 8.0 to about 7.7. The skeletal porosity of Galaxea fascicularis, Acropora millepora, massive Porites, and Pocillopora damicornis was higher (up to ~ 40%, depending on the species) at the seep sites compared to the control sites. Pocillopora damicornis also showed a decrease of micro-density (up to ~ 7%). Thus, further investigations conducted on this species showed an increase of the volume fraction of the larger pores (up to ~ 7%), a decrease of the intraskeletal organic matrix content (up to ~ 15%), and an increase of the intraskeletal water content (up to ~ 59%) at the seep sites. The organic matrix related strain and crystallite size did not vary between seep and control sites. This multi-species study showed a common phenotypic response among different zooxanthellate corals subjected to the same environmental pressures, leading to the development of a more porous skeletal phenotype under OA.

Photosystem II in Symbiotic Algae

1976 ◽  
Vol 3 (1) ◽  
pp. 133 ◽  
Author(s):  
RM Smillie
Keyword(s):  
Red Light ◽  
Pocillopora Damicornis ◽  
C3 Plant ◽  
Symbiotic Algae ◽  
Symbiodinium Microadriaticum ◽  
Unknown Species ◽  
Lizard Island ◽  
Tridacna Maxima ◽  
Photosynthetic Potential ◽  
Gymnodinium Microadriaticum

Symbiotic brown algae (zooxanthellae), Gymnodinium microadriaticum (= Symbiodinium microadriaticum), were isolated from the coral polyp Pocillopora damicornis and from the mantle of the clam Hippopus hippopus collected from coral reefs near Lizard Island on the Great Barrier Reef. Passage of the coral and clam zooxanthellae through a Yeda Press at 2000 and 21 000 p.s.i., respectively, yielded preparations of chloroplast lamellae with the ratio of chlorophyll α to chlorophyll c ranging from 0.95 to 1.2. The chloroplast preparations photoreduced 2,6-dichlorophenolindophenol (DCPIP) at rates of 1.66 (coral zooxanthellae chloroplasts) and 1.96 (clam zooxanthellae chloroplasts) micromoles DCPIP reduced per minute per milligram total chlorophyll in white light. Rates were 30-50% lower in red light. The photoreduction was inhibited more than 99% by 2.5 μM 3-(3,4-dichlorophenyl)-1,1-dimethylurea. Comparisons made with maize chloroplasts indicated that the clam zooxanthellae chloroplasts required only slightly higher light intensities for maximum rates of photoreduction of DCPIP than the grana-containing maize mesophyll chloroplasts. The coral zooxanthellae chloroplasts required a still higher light intensity for near saturation of the photoreduction of DCPIP, but not as high as that required by maize bundle sheath chloroplasts. Chloroplasts prepared from green algae isolated from the tissues of a tunicate of unknown species also photoreduced DCPIP but at low rates. Light saturation for the reaction was attained at around the same intensity as for the clam zooxanthellae chloroplasts. Based on the photosynthetic rate of zooxanthellae isolated from the clam Tridacna maxima and the number of cells contained in the mantle, it was concluded that the photosynthetic potential of the mantle of T. maxima, on either a chlorophyll or area basis, was about the same as that of a leaf of a C3 plant.

Zinc and cadmium absorption in the symbiotic anemone Anemonia viridis and the non-symbiotic anemone Actinia equina

1990 ◽  
Vol 70 (4) ◽  
pp. 789-802 ◽  
Author(s):  
A. D. Harland ◽  
G. W. Bryan ◽  
B. E. Brown
Keyword(s):  
Sea Water ◽  
Water Concentration ◽  
The Body ◽  
Sea Anemones ◽  
Symbiotic Algae ◽  
Cadmium Absorption ◽  
Zinc Concentrations ◽  
The Difference ◽  
Zinc Levels ◽  
Anemonia Viridis

Field and experimental observations on sea anemones (Actinaria) Ammonia viridis (Forskål) and Actinia equina (L.) indicated that in both species body zinc concentrations usually ranged between 100 and 200 ug (g dry wt)1 in waters containing up to 200 μg I1 of the metal. At higher dissolved concentrations, as observed in Restronguet Creek, A. equina exhibited only slightly enhanced tissue levels. However, in the laboratory, zinc levels in Anemonia viridis increased markedly at sea-water concentrations exceeding 200 μg I”1. Studies on the uptake of 65Zn-labelled zinc showed that, when the sea-water concentration was increased from 2 to 52 μg 11, both species absorbed the metal and new equilibria appeared to be reached in about a week. At equilibrium, the concentration of zinc in Actinia equina had risen by up to 11%, and in Anemon ia viridis, by up to 28%. About one third of the difference between the amounts absorbed by the two species may be accounted for by zinc accumulated in the symbiotic algae (zooxanthellae) of A. viridis. Short-term (12 h) experiments showed that, although A. viridis absorbed a significant amount of labelled zinc when the concentration increased from 2 to 52 μg I1, uptake was not much greater when the concentration increased from 2 to 202 μg I1. It is postulated that, up to a sea-water concentration of 202 μg I1, the absorption of zinc is dependent on the amount adsorbed at the body surface: saturation of the surface at higher concentrations leads to more direct dependence on the level of dissolved zinc.

scholarly journals Long-term changes in the susceptibility of corals to thermal stress around Phuket, Thailand

2017 ◽  
Author(s):  
Lalita Putchim ◽  
Niphon Phongsuwan ◽  
Chaimongkol Yaemarunpattana ◽  
Nalinee Thongtham ◽  
Claudio Richter
Keyword(s):  
Thermal Stress ◽  
Life History Traits ◽  
Sea Water ◽  
Species Level ◽  
Pocillopora Damicornis ◽  
Rapid Adaptation ◽  
Long Term Changes ◽  
Belt Transect ◽  
Line Intercept

The bleaching susceptibility of 28 coral taxa around southern Phuket was examined in four natural major bleaching events, in 1991, 1995, 2010, and 2016. Surveys were conducted by line intercept and belt transect methods. All coral colonies were identified to genus or species-level and their pigmentation status was assessed as: (1) fully pigmented (i.e. no bleaching), (2) pale (loss of colour), (3) fully bleached, and (4) recently dead as a result of bleaching-induced mortality. Bleaching and mortality indices were calculated to compare bleaching susceptibility among coral taxa. In 2016 some of the formerly bleaching susceptible coral taxa (e.g. Acropora, Montipora, Echinopora, and Pocillopora damicornis) showed far greater tolerance to elevated sea water temperature than in previous years. In P. damicornis the higher bleaching resistance encompassed all sizes from juveniles (<5cm) to adults (>30cm). In contrast, some of the formerly bleaching-resistant corals (e.g. the massive Porites, Goniastrea, Dipsastraea, and Favites) became more susceptible to bleaching over repeated thermal stress events. Our results support the hypothesis that some of the fast-growing branching corals (Acropora, Montipora, and Pocillopora) may have life-history traits that lead to more rapid adaptation to a changed environment than certain growing massive species.

scholarly journals Experimental Bleaching of a Reef-Building Coral Using a Simplified Recirculating Laboratory Exposure System

2010 ◽  
Vol 2010 ◽  
pp. 1-8 ◽  
Author(s):  
Mace G. Barron ◽  
Cheryl J. McGill ◽  
Lee A. Courtney ◽  
Dragoslav T. Marcovich
Keyword(s):  
Solar Radiation ◽  
Tissue Loss ◽  
Pocillopora Damicornis ◽  
Critical Research ◽  
Solar Simulator ◽  
Exposure System ◽  
Symbiotic Algae ◽  
Coral Reef Ecosystems ◽  
Radiation Treatments ◽  
Laboratory Exposure

Determining stressor-response relationships in reef building corals continues to be a critical research need due to global declines in coral reef ecosystems and projected declines for the future. A simplified recirculating coral exposure system was coupled to a solar simulator to allow laboratory testing of a diversity of species and morphologies of reef building corals under ecologically relevant conditions of temperature and solar radiation. Combinations of lamps and attenuating filters allowed for assignment of solar radiation treatments in experimental bleaching studies. Three bleaching experiments were performed using the reef building coral,Pocillopora damicornis, to assess the reproducibility of system performance and coral responses under control and stress conditions. Experiments showed consistent temperature- and solar radiation dependent-changes in pigment, numbers of symbiotic algae, photosystem II quantum yield, and tissue loss during exposure and recovery. The laboratory exposure system is recommended for use in experimental bleaching studies with reef building corals.

Oxygen Inhibition of Photosynthetic Oxygen Evolution in Marine Plants

1976 ◽  
Vol 3 (1) ◽  
pp. 73 ◽  
Author(s):  
WJS Downton ◽  
DG Bishop ◽  
AWD Larkum ◽  
CB Osmond
Keyword(s):  
Oxygen Uptake ◽  
Oxygen Concentration ◽  
Sea Water ◽  
Oxygen Electrode ◽  
Photosynthetic Oxygen Evolution ◽  
Pocillopora Damicornis ◽  
Oxygen Inhibition ◽  
Rate Of Photosynthesis ◽  
Tridacna Maxima ◽  
Effect Of Oxygen

The effect of oxygen concentration on oxygen exchange in six species of the Chlorophyta, one of the Cyanophyta, one of the Rhodophyta, three of the Phaeophyta, zooxanthellae from Tridacna maxima (clam) and Pocillopora damicornis (coral), and a marine angiosperm was investigated with a polaro- graphic oxygen electrode. The rate of photosynthesis in air-saturated sea water ranged from 14 to 248 micromoles of oxygen evolved per hour per milligram of chlorophyll. Photosynthesis was inhibited by 15-85% in sea water adjusted to between 65 and 90% of oxygen saturation. A post- illumination burst of oxygen uptake was observed on darkening and the size of this burst was in- fluenced by oxygen concentration. Steady-state rates of oxygen uptake in the dark were enhanced at higher oxygen tensions. The likelihood that the dissolved oxygen content of sea water may regulate the productivity of reef communities is discussed.

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