EurekaMag.com logo
+ Site Statistics
References:
52,725,316
Abstracts:
28,411,598
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

Fish communities of Geyser and Zelee coral banks Western Indian Ocean Peuplement ichtyologique des bancs de Geyser et Zelee Ocean Indien Occidental






Cybium. 31 Mars; 261: 11-26

Fish communities of Geyser and Zelee coral banks Western Indian Ocean Peuplement ichtyologique des bancs de Geyser et Zelee Ocean Indien Occidental

The ichtyofauna of Geyser and Zelee coral banks (north of Mozambique canal) was investigated in 1996, this work being the first quantitative study on this area. Quantitative data were collected on 11 stations (mean depth 18 m) by visual observations along 50 m transect, widened to 2 m for small sedentary species, and to 5 m for commercial species with a large action range. The main descriptors of the fish communities (species richness, abundance per species) and the trophic structure (omnivorous, herbivorous, carnivorous, browsers of sessile invertebrates) were described and analysed. A total of 294 fish species, belonging to 43 families were recorded. The species richness varied from 45 to 83 species / station, and the abundance, from 292 to 1322 individuals / 100 m2, the lower values being recorded on the inner slope and the higher ones on the outer slope. In terms of number of individuals, diurnal planktivores were highly represented at all sites (mean 63.7%). Pomacentridae and Caesionidae were the most abundant families, damselfishes being mainly represented by Chromis ternatensis (mean 73 ind., max. 148 ind. / 100 m2), C. dimidiata (mean 33 ind., max. 151 ind. / 100 m2) and Dascyllus carneus (mean 38 ind., max. 92 ind. / 100 m2), and fusiliers by Pterocaesio chrysozona (mean 19 ind., max. 128 ind. / 100 m2), P. tile (mean 12 ind., max. 38 ind. / 100 m2) and Caesio teres (mean 6 ind., max. 32 ind. / 100 m2). The high values recorded showed that small and isolated coral banks can support relatively rich fish faunas and substantial populations of individuals. This result may be explained by different factors such as the oceanographic circulation favourable to a localised enrichment of nutrients from surface water, the low human impact, a good coral cover and a high degree of self-recruitment associated with regional recruitment. Nevertheless, the main commercial species such as Lutjanus bohar and Variola louti, observed at each station, were represented at a low density (mean 0.8 ind., max. 6 ind. / 100 m2 and mean 0.2 ind., max. 0.8 ind. / 100 m2 respectively). This result may be due to the exploitation of these coral banks between 1990 and 1992, which was interrupted following the fast decreasing output. Such an experience shows us the fragility of these small coral banks and the necessity to establish a rational management of the resource.


Accession: 038251483



Related references

Chabanet, P.; Tessier, E.; Durville, P.; Mulochau, T.; Rene, F., 2002: Peuplement ichtyologique des bancs de Geyser et Zelee (Ocean Indien Occidental). The ichtyofauna of Geyser and Zelee coral banks (north of Mozambique canal) was investigated in 1996, this work being the first quantitative study on this area. Quantitative data were collected on 11 stations (mean depth 18 m) by visual observatio...

Mauge Louis A.; Segoufin Jacques; Vernier Eric; Froget Claude, 1982: Geomorphologie et origine des bancs du nord-est du canal de Mozambique-Ocean Indien occidental--Geomorphology and origin of the reef-banks of the northeastern Mozambique Channel-western Indian Ocean. Marine Geology 47(1-2): 37-55

Anonymous, 2007: Characterizing fish communities associated with drifting fish aggregating devices (FADs) in the Western Indian Ocean using underwater visual surveys FT Caracteristiques des communautes de poissons associees aux DCP (dispositifs de concentration de poissons) observes en plongee dans l'ouest de l'ocean Indien.

Letourneur, Yves., 1996: Study of fish populations in marine reserves the case of Mayotte Island, Western Indian Ocean Reponses des peuplements et populations de poissons aux reserves marines le cas de lile de Mayotte, Ocean Indien occidental. This study investigates the effects of establishment of a marine reserve on the coral reef fish communities at Mayotte Island, Western Indian Ocean, after three years of protection. Both total species richness and global abundance did not differ s...

Lebeau, A., 1978: La ciguatera dans l'ocean Indien: etude des poissons veneneux des bancs de l'archipel des Mascareignes et de la crete centrale de l'ocean Indien. Revue des Travaux de l'Institut des Peches Maritimes, 424: 325-345

Wolf Marie, 1989: Report on Fantail Geyser and Ouzel Geyser, Cascade Group, Upper Geyser Basin, Yellowstone National Park, Wyoming. GOSA Transactions - The Annual Journal of the Geyser Observation and Study Association 1: 155-177

Foley Duncan, 2004: How does your geyser grow? 3-D laser scanning and preliminary (super 14) C dating of Castle Geyser, upper Geyser Basin, Yellowstone National Park, Wyoming. Early explorers of Yellowstone described Castle Geyser as "a castellated turret" with ". . . its summit . . .formed . . . between large nodules of rock of the tint of ashes of roses . . .lined with a frost work of saffron." (Do...

Chabanet, P., 2002: Coral reef fish communities of Mayotte (western Indian Ocean) two years after the impact of the 1998 bleaching event. This study, conducted during the Coral Reef Observatory programme in 2000, was carried out at 9 localities: 4 on fringing reefs (0 and 3 m depth), 2 on inner reefs (0 and -3 m) and 3 on outer barrier reefs (3 and 6 m). Quantitative data were colle...

McClanahan, T.R.; Graham, N.A.J.; Wilson, S.K.; Letourneur, Y.; Fisher, R., 2009: Effects of fisheries closure size, age, and history of compliance on coral reef fish communities in the western Indian Ocean. The hypothesis that the history of management compliance (strong versus variable), closure size (0.3 to 28 km2), closure age (2 to 39 yr), and habitat/geographic variables influenced total fish biomass, the number of species, and the ratio of herb...

Foley Duncan, 2005: Building Castle Geyser; geologic and chronologic interpretation of the development of Castle Geyser, Upper Geyser Basin, Yellowstone National Park, Wyoming, USA. Castle Geyser, due to its large and imposing edifice, has long been interpreted as one of the oldest geysers in Yellowstone. While much attention has been paid to variations in its patterns of eruption, there has been relatively little discussion...