Geochemistry of diverse lava types from the Lau Basin (South West Pacific): Implications for complex back‐arc mantle dynamics

2018 ◽  
Vol 54 (6) ◽  
pp. 3643-3659 ◽  
Author(s):  
Haitao Zhang ◽  
Quanshu Yan ◽  
Chuanshun Li ◽  
Zhiwei Zhu ◽  
Renjie Zhao ◽  
...  
Keyword(s):  
Mantle Dynamics ◽  
West Pacific ◽  
Lau Basin ◽  
South West ◽  
Back Arc

Larval trypanorhynch cestodes in teleost fish from Moreton Bay, Queensland

2017 ◽  
Vol 68 (11) ◽  
pp. 2123 ◽  
Author(s):  
I. Beveridge ◽  
T. H. Cribb ◽  
S. C. Cutmore
Keyword(s):  
Host Species ◽  
Teleost Fish ◽  
New Caledonia ◽  
The South ◽  
West Pacific ◽  
Moreton Bay ◽  
South West ◽  
Lizard Island ◽  
The World

During a helminthological examination of teleost fish of Moreton Bay (Qld, Australia), 976 fish from 13 orders, 57 families and 133 species were examined and nine species of trypanorhynch metacestodes were identified. Callitetrarhynchus gracilis (Rudolphi, 1819) was the most frequently encountered species, found in 16 species of fish, with Callitetrarhynchus speciosus (Linton, 1897), Pterobothrium pearsoni (Southwell, 1929), Otobothrium alexanderi Palm, 2004, Otobothrium mugilis Hiscock, 1954, Otobothrium parvum Beveridge & Justine, 2007, Proemotobothrium southwelli Beveridge & Campbell, 2001, Pseudotobothrium dipsacum (Linton, 1897) and Heteronybelinia cf. heteromorphi Palm, 1999 occurring in fewer host species and at lower prevalences. Comparisons are made with studies elsewhere in the world and specifically within the South-west Pacific. Of the best studied regions in the South-west Pacific (Heron Island, Lizard Island, New Caledonia and now Moreton Bay), the fauna from Moreton Bay was found to be the most distinctive, with fauna from the three reef locations sharing 35–48% of species between sites and just 12–24% with Moreton Bay. The fauna of trypanorhynch cestodes from Lizard Island and New Caledonia was found to be the most similar.

scholarly journals Biogeochemical and biological impacts of diazotroph blooms in a Low Nutrient Low Chlorophyll ecosystem: synthesis from the VAHINE mesocosm experiment (New Caledonia)

2016 ◽  
Author(s):  
Sophie Bonnet ◽  
Melika Baklouti ◽  
Audrey Gimenez ◽  
Hugo Berthelot ◽  
Ilana Berman-Frank
Keyword(s):  
Food Web ◽  
N2 Fixation ◽  
New Caledonia ◽  
External Source ◽  
Marine Ecosystems ◽  
Inorganic Phosphorus ◽  
Food Web Structure ◽  
West Pacific ◽  
Planktonic Food ◽  
South West

Abstract. In marine ecosystems, N2 fixation provides the predominant external source of nitrogen (N) (140 ± 50 Tg N yr−1), contributing more than atmospheric and riverine inputs to the N supply. Yet the fate and magnitude of the newly-fixed N, or diazotroph-derived N (hereafter named DDN) in marine ecosystems is poorly understood. Moreover, it remains unclear whether the DDN is preferentially directly exported out of the photic zone, recycled by the microbial loop, and/or transferred into larger organisms, subsequently enhancing indirect particle export. These questions were investigated in the framework of the VAHINE (VAriability of vertical and tropHIc transfer of diazotroph derived N in the south wEst Pacific) project. Triplicate large volume (~50 m3) mesocosms were deployed in the tropical South West Pacific coastal ocean (New Caledonia) to maintain a stable water-mass without disturbing ambient light and temperature conditions. The mesocosms were intentionally fertilized with ~0.8 μM dissolved inorganic phosphorus (DIP) at the start of the experiment to stimulate diazotrophy. A total of 47 stocks, fluxes, enzymatic activities and diversity parameters were measured daily inside and outside the mesocosms by the 40 scientists involved in the project. The experiment lasted for 23 days and was characterized by two distinct and successive diazotroph blooms: a dominance of diatom-diazotroph associations (DDAs) during the first half of the experiment (days 2–14) followed by a bloom of UCYN-C during the second half of the experiment (days 15–23). These conditions provided a unique opportunity to compare the DDN transfer and export efficiency associated with different diazotrophs. Here we summarize the major experimental and modelling results obtained during the project and described in the VAHINE Special issue, in particular those regarding the evolution of the main standing stocks, fluxes and biological characteristics over the 23-days experiment, the contribution of N2 fixation to export fluxes, the DDN released to dissolved pool and its transfer to the planktonic food web (bacteria, phytoplankton, zooplankton). We then apply our Eco3M modelling platform further to infer the fate of DDN in the ecosystem and role of N2 fixation on productivity, food web structure and carbon export. Recommendations for future work are finally provided in the conclusion section.

scholarly journals Cainozoic and Recent deep sea cytherurid Ostracoda from south-west Pacific and eastern Indian Oceans: Part 1: Cytherurinae

1995 ◽  
Vol 47 (2) ◽  
pp. 203-223 ◽  
Author(s):  
M. A. Ayress ◽  
R. Whatley ◽  
S. E. Downing ◽  
K. J. Millson
Keyword(s):  
Deep Sea ◽  
West Pacific ◽  
South West
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