Combined effects of coral reef foraminifera Marginopora vertebralis and Heterostegina depressa in a multi-fractorial experiment

Warming and changes in ocean carbonate chemistry alter marine coastal ecosystems at an accelerating pace. The interaction between these stressors has been the subject of recent studies on reef organisms such as corals, bryozoa, molluscs, and crustose coralline algae. Here we investigated the combined effects of elevated sea surface temperatures and pCO2 on two species of photosymbiont-bearing coral reef Foraminifera: Heterostegina depressa (hosting diatoms) and Marginopora vertebralis (hosting dinoflagellates). The effects of single and combined stressors were studied by monitoring survivorship, growth, and physiological parameters, such as respiration, photochemistry (pulse amplitude modulation fluorometry and oxygen production), and chl a content. Specimens were exposed in flow-through aquaria for up to seven weeks to combinations of two pCO2 (~790 and ~490 µatm) and two temperature (28 and 31 °C) regimes. Elevated temperature had negative effects on the physiology of both species. Elevated pCO2 had negative effects on growth and apparent photosynthetic rate in H.depressa but a positive effect on effective quantum yield. With increasing pCO2, chl a content decreased in H. depressa and increased in M. vertebralis. The strongest stress responses were observed when the two stressors acted in combination. An interaction term was statistically significant in half of the measured parameters. Further exploration revealed that 75 % of these cases showed a synergistic (= larger than additive) interaction between the two stressors. These results indicate that negative physiological effects on photosymbiont-bearing coral reef Foraminifera are likely to be stronger under simultaneous acidification and temperature rise than what would be expected from the effect of each of the stressors individually.

Cargo tanks - bottom loading of flammable liquids, Volume II: review and analysis of liquid level control systems used in bottom loaking of flammable liquids into cargo tanks. Final report.

Federal Highway Administration, Bureau of Motor Carrier Safety, Washington, D.C.

Reduction of loss and damage in rail transportation of fresh fruits and vegetables by improved loading methods ...

Cover-title.

Steam warfare in the Parana: a narrative of operations, by the combined squadrons of England and France, in forcing a passage up that river,

Sketches of South America, illustrative of allusions in the foregoing narrative, to the geography, natural history, inhabitants, etc., of that part of the world. Extracts translated from Felix de Azara's Voyages dans l'Amérique Méridionale... v.2, p. [121]-287.

Back scattering of a plane electromagnetic wave from an infinite cylinder of plasma with small axial gradients and arbitrary radial gradients of electron density : normal incidence /

"Prepared under contract no. NOrd 18053."

Combined system of drainage and irrigation : "a new system of agriculture" /

Mode of access: Internet.

An essay on the history and management of literary, scientific, and mechanics' institutions and especially how far they may be developed and combined, so as to promote the moral well-being and industry of the country /

Half-title (p. [i-ii]) : Society of Arts. Prize essay on literary, scientific, and mechanics' institutions.

Recent developments connected with the hypersonic facility of the Polytechnic Institute of Brooklyn. Pt. I: Tests of the compression heater. Pt. II: Aspects of the design, construction and installation of a multiple-outlet collector for the convection heater.

Mode of access: Internet.

A brief sketch of the plan and advantages of a sectional floating dry dock, combined with a permanent stone basin and platform, and connected with level bedways, sliding ways, and housed slips, for repairing, launching, and laying up in ordinary the ships of the United States navy.

Microfilm. Ann Arbor, Mich., Xerox University Microfilms, 1973. 35 mm. (American Culture Series, reel 565.9)

Review of Johnson's English dictionary, as improved by Todd and abridged by Chalmers; with Walker's Pronouncing dictionary combined; to which is added Walker's key to the classical pronunciation of Greek, Latin, and scripture proper names. Edited by J. E. Worcester.

Attributed to John Pickering in a list of his published writings in the Collections of the Massachusetts Historical Society, v.10, 3d series, Boston, 1849, p.224.

Trafalgar, or The victory over the combined fleets of France and Spain; a poem. With other poems.

Mode of access: Internet.

Crowning day, 1-6 combined : contains 297 numbers of the most popular songs of this famous series of gospel song books. This is a superior collection of gospel songs and hymns suitable for every department of church work. A great book for evangelists /

Contains 297 numbered hymns.

A simulator study of the combined effects of alcohol and marihuana on driving behavior. Phase II. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

A simulator study of the combined effects of alcohol and marihuana on driving behavior. Phase I. Final report.

Mode of access: Internet.