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SEARSÉ (volet 1) Signature des eaux des rivières et des estuaires dans le sud-ouest de la Nouvelle-Calédonie 5
Lemonnier, Hugues; Royer, Florence; Lopez, Etienne; Berne, Stéphanie; Boher, Laura; Coignot, Elise; Desnues, Anne; Dupouy, Cécile; Helly, Maëlle; Gérard, Philippe; Gunkel-grillon, Peggy; Jamet, Léocadie; Lemestre, Monica; Liufau, Félise; Siano, Raffaele; Soulard, Benoit.
De par des mutations économiques, démographiques et sociétales, que connaît à ce jour la Nouvelle-Calédonie, des pressions anthropiques ne cessent de croître sur les milieux littoraux et côtiers. Les rivières sont d’importants vecteurs de transport de sédiments et d’éléments dissous. Ces apports, s’ils sont essentiels pour le fonctionnement des écosystèmes côtiers, peuvent être néfastes en cas d’excès (sels nutritifs, métaux et autres contaminants). Le projet SEARSE a pour objectifs de qualifier et de quantifier les apports des rivières et suivre leur devenir dans les panaches dans le lagon autour du grand Nouméa.
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Ano: 2020 URL: https://archimer.ifremer.fr/doc/00630/74207/73835.pdf
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Seasonal Shifts in Diazotrophs Players: Patterns Observed Over a Two-Year Time Series in the New Caledonian Lagoon (Western Tropical South Pacific Ocean) 5
Saulia, Emmrick; Benavides, Mar; Henke, Britt; Turk-kubo, Kendra; Cooperguard, Haley; Grosso, Olivier; Desnues, Anne; Rodier, Martine; Dupouy, Cécile; Riemann, Lasse; Bonnet, Sophie.
Coastal and open ocean regions of the Western Tropical South Pacific ocean have been identified as a hotspot of N2 fixation. However, the environmental factors driving the temporal variability of abundance, composition, and activity of diazotrophs are still poorly understood, especially during the winter season. To address this, we quantified N2 fixation rates and the abundance of seven diazotroph phylotypes (UCYN-A1 symbiosis, UCYN-B, UCYN-C, Trichodesmium, Het-1, Het-2, and Het-3) on a monthly basis during two full years (2012 to 2014) at four stations along a coast to open ocean transect in the New Caledonian lagoon. The total nifH gene concentration (sum of all nifH gene copies) clearly decreased from the barrier reef to the shore. Apart from UCYN-B,...
Tipo: Text Palavras-chave: N-2 fixation; Diazotrophs; NifH; Abundance; New Caledonia.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00658/77027/78307.pdf
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