Citation:

bg-9-1253-2012

Name: Madrepora oculata and Lophelia pertusa mass and 210Pb-226Ra chronology, Røst Reef, Norway, 2011
Published: 2011
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

Here we show the use of the 210Pb-226Ra excess method to determine the growth rate of corals from one of the world's largest known cold-water coral reef, the Røst Reef off Norway. Two large branching framework-forming cold-water coral specimens, one Lophelia pertusa and one Madrepora oculata were collected alive at 350 m water depth from the Røst Reef at ~67° N and ~9° E. Pb and Ra isotopes were measured along the major growth axis of both specimens using low level alpha and gamma spectrometry and the corals trace element compositions were studied using ICP-QMS. Due to the different chemical behaviors of Pb and Ra in the marine environment, 210Pb and 226Ra were not incorporated the same way into the aragonite skeleton of those two cold-water corals. Thus to assess of the growth rates of both specimens we have here taken in consideration the exponential decrease of initially incorporated 210Pb as well as the ingrowth of 210Pb from the decay of 226Ra. Moreover a~post-depositional 210Pb incorporation is found in relation to the Mn-Fe coatings that could not be entirely removed from the oldest parts of the skeletons.

The 226Ra activities in both corals were fairly constant, then assuming constant uptake of 210Pb through time the 210Pb-226Ra chronology can be applied to calculate linear growth rate. The 45.5 cm long branch of M. oculata reveals an age of 31 yr and a~linear growth rate of 14.4 ± 1.1 mm yr-1, i.e. 2.6 polyps per year. However, a correction regarding a remaining post-depositional Mn-Fe oxide coating is needed for the base of the specimen. The corrected age tend to confirm the radiocarbon derived basal age of 40 yr (using 14C bomb peak) with a mean growth rate of 2 polyps yr-1. This rate is similar to the one obtained in Aquaria experiments under optimal growth conditions.

For the 80 cm-long specimen of L. pertusa a remaining contamination of metal-oxides is observed for the middle and basal part of the coral skeleton, inhibiting similar accurate age and growth rate estimates. However, the youngest branch was free of Mn enrichment and this 15 cm section reveals a growth rate of 8 mm yr-1 (~1 polyp every two to three years). However, the 210Pb growth rate estimate is within the lowermost ranges of previous growth rate estimates and may thus reflect that the coral was not developing at optimal growth conditions.

Overall, 210Pb-226Ra dating can be successfully applied to determine the age and growth rate of framework-forming cold-water corals, however, removal of post-depositional Mn-Fe oxide deposits is a prerequisite. If successful, large branching M. oculata and L. pertusa coral skeletons provide unique oceanographic archive for studies of intermediate water environmentals with an up to annual time resolution and spanning over many decades.

Project(s):

European Project on Ocean Acidification (EPOCA)

Funding:

Seventh Framework Programme (FP7), grant/award no. 211384 : European Project on Ocean Acidification

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device
1	Site	Site		Douville, Eric
2	Latitude, southbound	Latitude south		Douville, Eric
3	Latitude, northbound	Latitude north		Douville, Eric
4	Longitude, westbound	Longitude west		Douville, Eric
5	Longitude, eastbound	Longitude east		Douville, Eric
6	Depth, top/min	Depth top	m	Douville, Eric
7	Depth, bottom/max	Depth bot	m	Douville, Eric
8	Species	Species		Douville, Eric
9	Sample ID	Sample ID		Douville, Eric
10	Identification	ID		Douville, Eric
11	Coral polyp	Polyp	#	Douville, Eric
12	Comment	Comment		Douville, Eric
13	Madrepora oculata, mass	M. oculata, mass	g	Douville, Eric
14	Lophelia pertusa, mass	L. pertusa m	kg	Douville, Eric
15	Lead-210 activity per mass	210Pb	Bq/kg	Douville, Eric	Spectrophotometry
16	Lead-210, standard deviation	210Pb std dev	±	Douville, Eric
17	Radium-226 activity per mass	226Ra	Bq/kg	Douville, Eric	Spectrophotometry
18	Radium-226, standard deviation	226Ra std dev	±	Douville, Eric
19	Uranium-238 activity per mass	238U	Bq/kg	Douville, Eric
20	Uranium-238, standard deviation	238U std dev	±	Douville, Eric
21	Thorium-228	228Th	Bq/kg	Douville, Eric	Spectrophotometry
22	Thorium-228, standard deviation	228Th std dev	±	Douville, Eric
23	Radium-226 activity per mass	226Ra	Bq/kg	Douville, Eric	Spectrophotometry
24	Radium-226, standard deviation	226Ra std dev	±	Douville, Eric
25	Potassium-40	40K	Bq/kg	Douville, Eric	Spectrophotometry
26	Potassium-40, standard deviation	40K std dev	±	Douville, Eric
27	Carbon-14, modern	pMC	%	Douville, Eric
28	Carbon-14, modern, error	pMC e	±	Douville, Eric
29	Age, upper confidence level	Age UCL	a AD/CE	Douville, Eric	see reference(s)
30	Age, lower confidence level	Age LCL	a AD/CE	Douville, Eric	see reference(s)

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

598 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 Site	2 Latitude south	3 Latitude north	4 Longitude west	5 Longitude east	6 Depth top [m]	7 Depth bot [m]	8 Species	9 Sample ID	10 ID	11 Polyp [#]	12 Comment	13 M. oculata, mass [g]	14 L. pertusa m [kg]	15 210Pb [Bq/kg] (Spectrophotometry)	16 210Pb std dev [±]	17 226Ra [Bq/kg] (Spectrophotometry)	18 226Ra std dev [±]	19 238U [Bq/kg]	20 238U std dev [±]	21 228Th [Bq/kg] (Spectrophotometry)	22 228Th std dev [±]	23 226Ra [Bq/kg] (Spectrophotometry)	24 226Ra std dev [±]	25 40K [Bq/kg] (Spectrophotometry)	26 40K std dev [±]	27 pMC [%]	28 pMC e [±]	29 Age UCL [a AD/CE] (see reference(s))	30 Age LCL [a AD/CE] (see reference(s))
R¯st Reef	67.0500	67.5333	9.4083	9.5083	300	350	Madrepora oculata			2.0		1.453		3.80	1.10	1.57	0.13	48	3	0.37	0.05	0.09	0.03	0.48	0.07
R¯st Reef	67.0500	67.5333	9.4083	9.5083	300	350	Madrepora oculata			1.0		0.971		4.80	0.28
R¯st Reef	67.0500	67.5333	9.4083	9.5083	300	350	Madrepora oculata			14.0		1.970		4.40	1.00	1.34	0.11	41	2	0.28	0.05	0.25	0.03
R¯st Reef	67.0500	67.5333	9.4083	9.5083	300	350	Madrepora oculata			12.0		0.936		4.58	0.31
R¯st Reef	67.0500	67.5333	9.4083	9.5083	300	350	Madrepora oculata			27.0		0.995		3.81	0.24
R¯st Reef	67.0500	67.5333	9.4083	9.5083	300	350	Madrepora oculata			35.0		2.150		4.10	0.80	1.29	0.10	37	2	0.25	0.04	0.22	0.03
R¯st Reef	67.0500	67.5333	9.4083	9.5083	300	350	Madrepora oculata			35.0		1.135		3.59	0.19
R¯st Reef	67.0500	67.5333	9.4083	9.5083	300	350	Madrepora oculata			51.0		2.041		4.50	0.90	1.41	0.11	42	2	0.22	0.03
R¯st Reef	67.0500	67.5333	9.4083	9.5083	300	350	Madrepora oculata			51.0		0.987		3.45	0.18
R¯st Reef	67.0500	67.5333	9.4083	9.5083	300	350	Madrepora oculata			66.0		2.130		3.90	0.90	1.28	0.10	41	2	0.26	0.04	0.20	0.08	0.23	0.03
R¯st Reef	67.0500	67.5333	9.4083	9.5083	300	350	Madrepora oculata			68.0		0.994		2.83	0.15
R¯st Reef	67.0500	67.5333	9.4083	9.5083	300	350	Madrepora oculata			76.0		2.210		2.90	0.80	1.39	0.10	38	2	0.31	0.05	0.19	0.08	0.13	0.03
R¯st Reef	67.0500	67.5333	9.4083	9.5083	300	350	Madrepora oculata			77.0		0.987		2.80	0.30
R¯st Reef	67.0500	67.5333	9.4083	9.5083	300	350	Madrepora oculata				Mt	1.720		7.80	1.00	1.93	0.10	47	2	0.22	0.02	0.26	0.06	0.35	0.04
R¯st Reef	67.0500	67.5333	9.4083	9.5083	300	350	Madrepora oculata				Mb	2.070		72.20	4.40	1.96	0.21	49	4	2.09	0.20	0.19	0.12	0.47	0.09
R¯st Reef	67.0500	67.5333	9.4083	9.5083	300	350	Lophelia pertusa			0.5			0.000710	4.04	0.28
R¯st Reef	67.0500	67.5333	9.4083	9.5083	300	350	Lophelia pertusa			5.0			0.002045	2.90	0.90	1.69	0.11	33	2	0.50	0.05	0.09	0.03	0.53	0.07
R¯st Reef	67.0500	67.5333	9.4083	9.5083	300	350	Lophelia pertusa			4.5			0.000870	3.72	0.34
R¯st Reef	67.0500	67.5333	9.4083	9.5083	300	350	Lophelia pertusa			5.5			0.001177	3.04	0.34
R¯st Reef	67.0500	67.5333	9.4083	9.5083	300	350	Lophelia pertusa			12.5			0.001020	5.90	1.40	2.13	0.16	37	3	2.70	0.17	0.50	0.13	0.53	0.07
R¯st Reef	67.0500	67.5333	9.4083	9.5083	300	350	Lophelia pertusa			9.0			0.000510	5.52	0.26
R¯st Reef	67.0500	67.5333	9.4083	9.5083	300	350	Lophelia pertusa			16.0			0.000500	5.28	0.25
R¯st Reef	67.0500	67.5333	9.4083	9.5083	300	350	Lophelia pertusa			21.0			0.002120	2.30	1.00	1.68	0.12	36	2	0.39	0.05	0.25	0.07	0.35	0.05
R¯st Reef	67.0500	67.5333	9.4083	9.5083	300	350	Lophelia pertusa			20.5			0.001100	5.27	0.18
R¯st Reef	67.0500	67.5333	9.4083	9.5083	300	350	Lophelia pertusa			26.5			0.001300	5.60	1.20	1.39	0.12	39	2	1.31	0.10	0.09	0.04	0.42	0.05
R¯st Reef	67.0500	67.5333	9.4083	9.5083	300	350	Lophelia pertusa			26.0			0.000680	6.40	0.34
R¯st Reef	67.0500	67.5333	9.4083	9.5083	300	350	Lophelia pertusa			27.5			0.000620	6.00	0.34
R¯st Reef	67.0500	67.5333	9.4083	9.5083	300	350	Lophelia pertusa			31.0			0.001740	3.90	0.90	1.65	0.11	36	2	0.05	1.00			0.39	0.05
R¯st Reef	67.0500	67.5333	9.4083	9.5083	300	350	Lophelia pertusa			31.0			0.001740	2.99	0.17
R¯st Reef	67.0500	67.5333	9.4083	9.5083	300	350	Lophelia pertusa				Lt		0.001790	5.10	1.30	1.89	0.16	35	2	0.27	0.06	0.25	0.12	0.60	0.01
R¯st Reef	67.0500	67.5333	9.4083	9.5083	300	350	Lophelia pertusa				Lbc		0.001190	3.00	1.80	1.63	0.18	36	3
R¯st Reef	67.0500	67.5333	9.4083	9.5083	300	350	Lophelia pertusa				Lb		0.004680	161.80	2.10	2.95	0.09	36	1	2.37	0.07	0.71	0.10	1.40	0.10
R¯st Reef	67.0500	67.5333	9.4083	9.5083	300	350	Madrepora oculata	Mad 79	GifA09467-SacA17521																	99.1	0.3	1970	1964
R¯st Reef	67.0500	67.5333	9.4083	9.5083	300	350	Madrepora oculata	Mad 75	GifA09472-SacA17526																	104.1	0.3	1974	1968
R¯st Reef	67.0500	67.5333	9.4083	9.5083	300	350	Madrepora oculata	Mad 52	GifA09481-SacA17535																	105.0	0.4	1982	1978
R¯st Reef	67.0500	67.5333	9.4083	9.5083	300	350	Madrepora oculata	Mad 32	GifA09487-SacA17541																	105.2	0.3	1992	1989
R¯st Reef	67.0500	67.5333	9.4083	9.5083	300	350	Madrepora oculata	Mad 2	GifA09496-SacA17673																	105.6	0.3	2006	2006