Calcite production by Coccolithophores in the South East Pacific Ocean: from desert to jungle

Abstract. BIOSOPE cruise achieved an oceanographic transect from the Marquise Islands to the Peru-Chili upwelling (PCU) via the centre of the South Pacific Gyre (SPG). Water samples from 6 depths in the euphotic zone were collected at 20 stations. The concentrations of suspended calcite particles, coccolithophores cells and detached coccoliths were estimated together with size and weight using an automatic polarizing microscope, a digital camera, and a collection of softwares performing morphometry and pattern recognition. Some of these softwares are new and described here for the first time. The coccolithophores standing stocks are usually low and reach maxima west of the PCU. The coccoliths of Emiliania huxleyi, Gephyrocapsa spp. and Crenalithus spp. (Order Isochrysidales) represent 50% of all the suspended calcite particles detected in the size range 0.1–46 μm (21% of PIC in term of the calcite weight). The latter species are found to grow preferentially in the Chlorophyll maximum zone. In the SPG their maximum concentrations was found to occur between 150 and 200 m, which is very deep for these taxa. The weight and size of coccoliths and coccospheres are correlated. Large and heavy coccoliths and coccospheres are found in the regions with relative higher fertility in the Marquises Island and in the PCU. Small and light coccoliths and coccospheres are found west of the PCU. This distribution may correspond to that of the concentration of calcium and carbonate ions.

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Calcite production by coccolithophores in the south east Pacific Ocean

Biogeosciences ◽

10.5194/bg-5-1101-2008 ◽

2008 ◽

Vol 5 (4) ◽

pp. 1101-1117 ◽

Cited By ~ 58

Author(s):

L. Beaufort ◽

M. Couapel ◽

N. Buchet ◽

H. Claustre ◽

C. Goyet

Keyword(s):

Size Range ◽

Digital Camera ◽

Euphotic Zone ◽

High Fertility ◽

The South ◽

East Pacific ◽

Maximum Cell ◽

South Pacific Gyre ◽

East Pacific Ocean ◽

First Time

Abstract. BIOSOPE cruise covered an oceanographic transect through the centre of the South Pacific Gyre (SPG) from the Marquesas archipelago to the Peru-Chile upwelling (PCU). Water samples from 6 depths in the euphotic zone were collected at 20 stations. The concentrations of suspended calcite particles, coccolithophores cells and detached coccoliths were estimated together with size and weight using an automatic polarizing microscope, a digital camera, and a collection of softwares performing morphometry and pattern recognition. Some of these softwares are new and described here for the first time. The coccolithophores standing stocks were usually low and reached maxima west of the PCU. The coccoliths of Emiliania huxleyi, Gephyrocapsa spp. and Crenalithus spp. (Order Isochrysidales) represented more than 30% of all the suspended calcite particles detected in the size range 0.1–46 μm (22% of PIC in term of calcite weight). These species grew preferentially in the Chlorophyll maximum zone. In the SPG their maximum cell concentrations were recorded between depth of 150 and 200 m, which is unusually deep for these taxa. The weight of coccoliths and coccospheres were correlated to their size. Large and heavy coccoliths and coccospheres were found in regions with relatively high fertility in the Marquises Island and in the PCU. Small and light coccoliths and coccospheres were found west of the PCU. This distribution is strongly related to ocean chemistry in particular to alkalinity and to carbonate ions concentration. The biotic (coccolithophores production) influence on calcification is mainly driven at the local scale (depth) whereas the abiotic (carbonate chemistry) plays its most important role at the regional (horizontal) level. Here 94% of the variability of coccolith and coccosphere weight can be explained by a change in 7 environmental variables.

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Towards sustainable fishery management for skates in South America: The genetic population structure of Zearaja chilensis and Dipturus trachyderma (Chondrichthyes, Rajiformes) in the south-east Pacific Ocean

PLoS ONE ◽

10.1371/journal.pone.0172255 ◽

2017 ◽

Vol 12 (2) ◽

pp. e0172255 ◽

Cited By ~ 8

Author(s):

Carolina Vargas-Caro ◽

Carlos Bustamante ◽

Michael B. Bennett ◽

Jennifer R. Ovenden

Keyword(s):

Population Structure ◽

Pacific Ocean ◽

South America ◽

Fishery Management ◽

Genetic Population Structure ◽

The South ◽

Genetic Population ◽

East Pacific ◽

Sustainable Fishery ◽

East Pacific Ocean

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Insights into the reproductive biology and fisheries of two commercially exploited species, shortfin mako (Isurus oxyrinchus) and blue shark (Prionace glauca), in the south-east Pacific Ocean

Fisheries Research ◽

10.1016/j.fishres.2013.02.007 ◽

2013 ◽

Vol 143 ◽

pp. 174-183 ◽

Cited By ~ 16

Author(s):

Carlos Bustamante ◽

Michael B. Bennett

Keyword(s):

Pacific Ocean ◽

Reproductive Biology ◽

The South ◽

Blue Shark ◽

Prionace Glauca ◽

Isurus Oxyrinchus ◽

East Pacific ◽

Shortfin Mako ◽

East Pacific Ocean

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Coral boring Aka-species (Porifera: Phloeodictyidae) from Mexico with description of Aka cryptica sp. nov.

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315407055373 ◽

2007 ◽

Vol 87 (6) ◽

pp. 1477-1484 ◽

Cited By ~ 12

Author(s):

José Luis Carballo ◽

Leanne Hepburn ◽

Héctor H. Nava ◽

José Antonio Cruz-Barraza ◽

Eric Bautista-Guerrero

Keyword(s):

New Species ◽

Pacific Ocean ◽

Coral Reefs ◽

Mexican Pacific ◽

East Pacific ◽

Mexican Caribbean ◽

Caribbean Coral Reefs ◽

The Caribbean ◽

East Pacific Ocean ◽

First Time

This paper focuses on Aka species boring coral of the East Pacific Ocean and the Caribbean Sea (Mexico). The new species Aka cryptica sp. nov. is described from Mexican Pacific coral reefs, which constitutes the first time that a species of the genus Aka is reported from the East Pacific Ocean. The new species lives cryptically boring coral species of the genus Pocillopora. It is characterized by the small size of their papillae (from 1 to 4.5 mm high and from 0.8 to 1.8 mm in diameter), and oxeas (from 67 to 120 μm), and their exposed parts blend in well with background colours which tend to be overlooked during benthic marine surveys. In addition, Aka coralliphaga and Aka brevitubulata from Mexican Caribbean coral reefs are redescribed. The latter species is reported for the first time in Mexico.

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Heterotrophic bacterial production in the South East Pacific: longitudinal trends and coupling with primary production

Biogeosciences Discussions ◽

10.5194/bgd-4-2761-2007 ◽

2007 ◽

Vol 4 (4) ◽

pp. 2761-2791 ◽

Cited By ~ 11

Author(s):

F. Van Wambeke ◽

I. Obernosterer ◽

T. Moutin ◽

S. Duhamel ◽

O. Ulloa ◽

...

Keyword(s):

Pacific Ocean ◽

Primary Production ◽

Bacterial Production ◽

South Pacific ◽

Leucine Incorporation ◽

The South ◽

Phytoplankton Primary Production ◽

East Pacific ◽

Wide Range ◽

South Pacific Gyre

Abstract. Spatial variations of heterotrophic bacterial production and phytoplankton primary production were investigated across South East Pacific Ocean (–141° W, –8° S to –72° W, –35° S) in November–December 2004. Bacterial production (³H leucine incorporation) integrated over the euphotic zone encompassed a wide range of values, from 43 mg C m−2 d−1 in the hyper-oligotrophic South Pacific Gyre to 392 mg C m−2 d−1 in the upwelling off Chile. Within the gyre (120° W, 22° S) records of low phytoplankton biomass (7 mg TChla m−2) were obtained and in situ 14C based particulate primary production rates were as low as 153 mg C m−2 d−1, thus equal to the value considered as a limit for primary production under strong oligotrophic conditions. In the South Pacific gyre average rates of ³H leucine incorporation rates, and leucine incorporation rates per cell (5–21 pmol L−1 h−1 and 15–56×10−21 mol cell−1 h−1, respectively), were in the same range as those reported for other oligotrophic sub tropical and temperate waters. Rates of dark community respiration, determined at selected stations across the transect varied in a narrow range (42–97 mmol O2 m−2 d−1), except for one station in the upwelling off Chile (245 mmol O2 m−2 d−1). Bacterial growth efficiencies varied between 5 and 38% and bacterial carbon demand largely exceeded 14C particulate primary production across the South Pacific Ocean. Net community production also revealed negative values in the South Pacific Gyre (–13±20 to –37±40 mmol O2 m−2 d−1). Such imbalances being impossible in this area far from any external input, we discuss the techniques involved for determining the coupling between primary production and bacterial heterotrophic production.

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