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Macrobenthos and meiobenthos from the Closed Lagoon of a Polynesian Atoll. Maturei Vavao (Tuamotu)
Renaud-Mornant, J.; Salvat, B.; Bossy, C. (1971). Macrobenthos and meiobenthos from the Closed Lagoon of a Polynesian Atoll. Maturei Vavao (Tuamotu). Biotropica 3(1): 36-55
In: Biotropica. Association for Tropical Biology and Conservation: Lawrence, KS, etc.. ISSN 0006-3606; e-ISSN 1744-7429
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| Auteurs | | Top |
- Renaud-Mornant, J.
- Salvat, B.
- Bossy, C.
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| Abstract |
A bottom faunal survey was undertaken in the lagoon of a closed Tuamotuan atoll. Sediments from 5 stations located along a transect from inner lagoon to lagoon center were collected by skin or SCUBA diving. Macro and meiobenthic faunal assembleges were studied in relation to hydrodynamic conditions, depth and sediment composition and grain size. The macrofauna community is homogenous throughout the lagoon floor including the molluscs, Pinctada maculata, Chama imbricata, Arca plicata and A. ventricosa and the echinoderm Halodeima (Holothuria) atra, all of which occur in great numbers. Meiofauna abundance increases with depth, fineness of sediment and higher organic matter content. Diversity is higher in shallow water stations and is greatly reduced at maximum depth (40 m). Food interrelationships between macro- and meiofauna are demonstrated by Halodeima atra which ingests a large amount of meiofauna, other macrofauna components being filter feeders. Predaceous spp of the meiofauna occur in larger numbers in coarser shallow sediments, but as a whole most of the meiofauna components are deposit-feeders with the exception of molluscan larvae. Faunal assemblages, abundance, and diversity are compared to those of an open atoll lagoon (Mururoa, Tuamotu); different spp distributions are discussed in relation to differing hydrodynamic conditions occurring in both types of lagoon. |
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