The Great Astrolabe Reef Lagoon (Fiji)
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l1........' ",,;0,.,_._ ----• 'Ii il .,.." n .... p ....... lh .... ....a- .• .. ....... _. • 7 ...... ".... 11 .ul ; U • • l'e')'ntl;~ r""lçaiu ft• \I\JC\~i(/ \ 1 L'Institut français de recherche scientifique pour le développement en coopération ~'IUlrp~' I ..oï.·_ ~ 'hnrl)~'·nollbnud ~'Inlld(·_ :'\.·"'.·11 l'.·,,·,· Tlu· G......t .\st..ohabe R.·.·f I~..gooll .t"iji. : R.·su1ts of th.· F.-.·n(·h.•'ijian ~\STRO .·xp.·.lition OCEANOGRAPH 1E Notes et documents ne 46 1996 Centre ORSrOM de Tahiti Polynésie Française OCÉANOGRAPHIE Notcs et docunlcnts nO 46 1996 ISSN-0755-3412 General introduction L. Charpy. Phytoplankton biomass andproductivity in The Great Astrolabe Lagoon ,.. ,. , p.l L. Charpy, N. Harrison and M. Maata. Nutrients and Particulate organic matter in The Great Astrolabe ReefLagoon p.5 C. Chevillon, G. Yeo and A. Di Matteo. Sedirnent constituents in the Great Astrolabe Reeflagoon (Fiji) , p.ll J. Clavier, P. Newell, C. Garrigue, B. Richer de Forges and A. Di Matteo. Soft substrate macrobenthos ofFiji's Great Astrolabe Reeflagoon. List of taxons, densifies and their biomass p.17 G. Boucher and J. Kotta. Composition et diversité de la méiofaune du lagon de « Great Astrolabe Reef» (Fiji). , p. 47 C. Charpy-Roubaud. Microphytobenthic biomass andproduction ofthe Great Astrolabe Reeflagoon sediments , , p.53 G. Sarazin and C. Charpy-Roubaud. Some main processes oforganic matter mineralization and marientflu.xes at the sediment-water interface in the Great Astrolabe lagoon (Fiji) p.60 J. Blanchot. Report ofpicophytoplankton study during the astro cruise ln the Great Astrolabe Reef(18°45 '8-178°30 'E) Fiji p.69 J.-P. Torréton. Biomass, production and heterotrophic activity of bacterioplankton in the Great Astrolabe ReefLagoon p.78 C. Charpy-Roubaud, G. Sarazin and R. Buscail. Organic carbon, nitrogen andphosphorus in the Great Astrolabe Reeflagoon sediments. Preliminary results p. 91 Centre OR8TOM de Ta hiti BP 529 - Papeete (Polynésie Française) Genera/Introduction Notes et Doc Océanogr. J996, 46 General introduction Tbis work was carried out in Fiji as part of the (Figure 1). The Astrolabe Islands are a group of international cooperation in marine biology between volcanie islands 3.3 to 3.5 million years old France and Fiji. This cooperation was initiated in (Howorth & Carman, 1992). The climate is humid 1991 between the Tahiti ORSTOM Center and the tropical with an average temperature of 25"C and Institute of Marine Resources (The University of rainfall of 2596 mm. Prevailing winds are from the South Pacifie, Suva). south cast. There are 13 islands, 4 of which 4 are In 1988, a Marine Pollution Research Group was inhabited (l000 inhabitants). Fish is the major forrned at USP to coordinate the work in this field at source of protein for the villagers in the group the University. The group decided to carry out a (Naqasima et al., 1992). 2 baseline study of the Astrolabe lagoon and reef. The 'Ibe lagoon surface area is approximately 210 km . development of Dravuni as an important center for The maximum depth is about 37.5m and the average reef and lagoon research, attracting scientists from depth is 20m (Naqasima et al., 1992). The residence around the world was also envisaged (Morrison & time for the Astrolabe lagoon was estimated 15-25 Naqasima, 1992). days in tirst approximation by MacLeod (1992). In 1991, the ORSTOM CYEL program in French Preliminary results on marine biology, water quality, Polynesian atolls began, with the object of creating a shellfish quality and sediments were published by models for the operating system of atoll lagoons. Naqasima & Sandy (1992), Morrison & Maata Contacts were made between US? and ORSTOM (1992), Morrison et al. (1992), Morrison & Naidu scientists and the site of the Great Astrolabe Reef (1992). lagoon was choosen for a join study. A preliminary expedition was donc in 1993 and a proposaI Thirteen scientists have studied the GAR lagoon in (ASTRO) was drawn up to complete the baseline May 1994 (Table 1). study of the Great Astrolabe Reef lagoon and to A part of them was based in the field research compare the GAR lagoon with French Polynesian station of Dravuni Island with the support of the lagoons. USP APHAREUS research vessel ship and the The description of the Great Astrolabe Reef and others in the üRSTOM ALiS research vessel ship. lagoon appears in Morrison & Naqasima (1992) : This volume presents 10 papers redacted by 16 The Great Astrolabe Reef (I8°45'S, 178°30'E) is scientists from 9 institutes (Table 1) situated north-cast of Kadavu and south of Viti Levu IS(r. ! 15'5- FIJI /YASAWA ,1' 17Cl5- , ,1:1 Q pKORO OVALAU ~ LEVIJKA • <;JNAIRAI IBOS SUVA D8EQA iJ.VATIJ~LELEltl <;]MOALA GREA T ASTROLABE . REEF AND LAGOON ONQ ~ KABARAO.- '.' KAOAVU 1 D 1 ~ 4 1 1 178'E 179'E 180' 179'W «'igure 1 : Location of Great Astrolabe Reef General Introduction. Notes et Doc. Océanogr. 1996. 46 Table 1: List of the participants in the ASTRO expedition and authors ofthis ,'olume Name Institute ~peciàlt)t Blanchot 1. ORSTOM Nouméa ASTRO Picoplankton Boucher G. MNHNParis Meiofauna Buscail R. Univ. de Perpignan Geochimist Charpy L.* üRSTOM Tahiti ASTRO Primary production Charpy-Roubaud C** ORSTOM Tahiti ASTRO Microphytobenthos Clavier J. ORSTOM Brest ASTRO Zoobenthos Di Matteo A. üRSTOM Nouméa Zoobenthos Garrigue C. o ORSTOM Nouméa Phytobenthos Harrison N. USP (Fiji) ASTRO Chemistry Kotta J. t-.1NHN Paris Meiofauna Lo L. EVAAM Tahiti ASTRO Chemistry Maata M. USP (Fiji) AS'fRO Chemistry Maihota N. üRSTOM Tahiti ASTRO Diver Manuelli F. USP (Fiji) ASTRO Diver Newel P. USP (Fiji) ASTRO Zoobenthos Richer de Forges B. üRSTOM Nouméa Zoobenthos Sarazin G. Univ. Paris VII ASTRO Geochemistry Torreton J.-P. üRSTOM Tahiti ASTRO Bacteria YeoG. o USP (Fiji) ASTRO Sediments '" Expedition leader for the water column study u Expedition leader for the benthos study Funding support was provided by the French MacLeod B. (1992). Hydrodynamics, in' Morrison RJ, Embassy in Suva, the üRSTüM program CYEL Naqa<;ima M.R. (eds) Fiji 's Great Astrolabe Reel and Lagoon. A baseline sudy. Environment31 Sudies Report 56: (Tahiti), the ORSTOM program FLUPAC (New 17-22 Caledonia), the IMR (Suva), the Schoal of Pure and Morrison R.J, Gangaiya P., Naqasima M.R. (1992). Shellfish Applied Science (USP, Suva) and the University of quality. in: Morrison RJ., Naqasima M.R. (cds). Fiji 's Great Paris VII. Astrolabe Reel and Lagoon: A baseline sudy. Environmenlal Sudies Report 56: 135-138. Morrison RJ., l.avelawa F., Naqasima M.R. (1992). General ACKNOWLEDGMENTS features of the Astrolabe Lagoon. in: Morrison RJ., Naqasima M.R. (eds). Fiji's Great Astrolabe Reel and We thank Pr. R. South, who initiated of the French Lagoon: A. baseline sudy. Environmental Sudies Report 56: Fijian cooperation, M. Bourelon who \vas in charge 5-16. Morrison RJ., Maata M., Aalbersberg W., Koshy K., Harrison of Regional Cooperation at the French Embassy and N.L, Peter W., Vuki M., Fuavao V.A., Naidu S., Dixon W. M. 1.-A. Costilhes, French Ambassador in Fiji and (1992). Water quality. in: Morrison RJ., Naqasima M.R. M. Boccas, Director ofthe Tahiti üRSTüM Center. (eds), Fiji 's Great Astrolabe Ree/ and Lagoon: A baseli/le sudy. Environmental Sudies Report 56: 117-134. We al 50 thank the crews of the research vessels Morrison RJ., Naidu R. (1992). Sediments. Chemistey and mineralogy. in: Morrison RJ" Naqa<;ima M.R. (eds). Fiji 's ALIS and APHAREUS for their kind and efficient Great Astrolabe Reef and Lagoon: A baseline sudy. help on board, the leader of the Dravuni field Environmenlal Sudies Report 56: 139-150. Station. Morrison RJ., Naqa<;ima M.R. (1992). Fiji's Great Astrolabe Reef and Lagoon: A baseline sudy. Environmental Sudies We also thank very waJmly the traditional Report 56: 150pp. landowners of Dravuni Island for allowing us to Morrison RJ., Naqasima M.R. (1992). General introduction. in: Morrison RJ., Naqasima M.R, (eds). Fiji's Great Astrolabe work in the lagoon and aIl the lnhabitants of the Reel and Lagoon: A baseline sudy. Environmentai Sudies Island for their kind welcome. Report 56: 1-3 Naqasima M.R., Bandy M. (1992). Marine Biology. in: Morrison References RJ., Naqasima M.R (eds). Fiji's Great Astrolabe Reeland Lagoon: A baseline sudy. Environmental Sudies Report 56: 65-116. Haworth R., Carman G. (1992). Geology of the Astrolabe Nunn P.D. (1992). Geomorphology. in: Morrison RJ., Naqasima Islands. in: Morrison RJ., Naqasima M.R. (cds). Fiji's Great M.R. (eds). Fiji 's Great Astrolabe Reef and Lagoon: A Astrolabe Reeland Lagoon: A baseline sudy. Environmental baseline sudy. Environmental Sudies Report 56: 47-64. Sudies Report 56: 2J-46 Phytop/ankton production ofthe GA R /agoon Notes et Doc Océanogr /996, 46.' /-4 Phytoplankton biomass and productivity in The Great Astrolabe Lagoon by Loïc Charpy ORSTOM, Centre d'Océanologie de Marseille, traverse de la Batterie des Lions, F-13007 Marseille, France. Abstract LI-COR solarimeter. Following incubation, bottles were filtered through 3 Ilm Nuclepore filters ; Phytoplankton biomass and productivity of the pressure heads during fractionation never exceeded Great Astrolabe Reef lagoon were studied using 0.004 atm. The filtrates were immediately refiltered measurements of chlorophyll concentration and onto 1 Ilm Nuclepore filters and then onto 25 mm carbon uptake. Average chlorophyll concentration Whatman GF/F glass fiber filters. Filters were was 0.8 mg m-3 with 45% of phytoplankton passing aciditied with 250 III of O.5N HCI to remove through 31lm. Primary production was 1.3 gC m'2 inorganic carbon. Radioactivity was measured with dail (30m depth) with 47 % due to phytoplankton a liquid scintillation counter. Areal production was <3Jlm. ca1culated by trapezoidal Integration and daily production estimated by dividing the production 1. Introduction measured during the incubation period by the fraction oftotal daily irradiance during that period.