Do human activities affect the picoplankton structure of the Ahe atoll lagoon Tuamotu Archipelago, French PolynesiaReport as inadecuate




Do human activities affect the picoplankton structure of the Ahe atoll lagoon Tuamotu Archipelago, French Polynesia - Download this document for free, or read online. Document in PDF available to download.

1 UMR-CNRS 5119 2 LIENSs - LIttoral ENvironnement et Sociétés - UMR 7266 3 MIO - Institut méditerranéen d-océanologie

Abstract : The spatial variations of the picoplankton photoautotrophic and heterotrophic microorganisms in the Ahe atoll lagoon were studied in May and October 2008 to assess whether they were affected by human activities along the atoll. Spatial patterns were studied using 10 sampling stations chosen according to the location of the anthropogenic activities pearl farming, harbor. Experiments were also carried out to determine whether bacterial growth, with or without predators, was limited by inorganic N and P substrates. The results showed that heterotrophic bacterioplankton abundance was superior to the photoautotrophic organisms, especially in May. Significant increases in bacterial abundance were observed in May after 24 hours incubation with +P and +N but not in October. All samples complied with the quality levels for fecal indicator bacteria FIB defined by the European Union and there was no evidence that human sewage had any impact on picoplankton over the whole atoll.

Keywords : Human sewage Atoll Picoplankton Enrichment experience





Author: Marc Bouvy - Christine Dupuy - Marc Pagano - Aude Barani - Loic Charpy -

Source: https://hal.archives-ouvertes.fr/



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