SABIIA - Sistema Aberto e Integrado de Informação em Agricultura (Sabiia)

Sicre, Marie-alexandrine; Labeyrie, Laurent; Ezat, Ullah; Mazaud, Alain; Turon, Jean-louis.

Terrestrial inputs were reconstructed using high molecular weight n-alkane concentrations recorded in the sub-Antarctic Indian Ocean core MD94-103 (45 degrees 35'S, 86 degrees 31'E, 3560 m) to examine regional changes in the atmospheric circulation over the last 27 kyr. This record was compared to the dust content of EPICA-Dome C ice and continental data from South Africa ( e. g., pollen sequences and isotope records in speleothems) to get a comprehensive understanding of atmospheric links between low and midlatitudes of the Indian Ocean. Terrestrial n-alkanes indicate higher glacial than Holocene inputs and marked glacial oscillations. Minimum values during the Last Glacial Maximum (LGM) are consistent with colder and drier climate and presumably caused...

Tipo: Text

Palavras-chave: Biomarker; Glacial; Indian Ocean; Marine sediments; Paleoclimate; Terrestrial.

Ano: 2006

URL: https://archimer.ifremer.fr/doc/00234/34547/33355.pdf

A complete structural model and kinematic history for distributed deformation in the Wharton Basin

Stevens, Duncan E.; Mcneill, Lisa C.; Henstock, Timothy J.; Delescluse, Matthias; Chamot-rooke, Nicolas; Bull, Jonathan M..

The equatorial eastern Indian Ocean hosts a diffuse plate boundary, where widespread deformation accommodates the relative motion between the Indian, Australian and Capricorn sub-plates. We integrate IODP Expedition 362 borehole data, which for the first time provides an accurate, ground-truthed chronostratigraphy of the sedimentary sequence east of the Ninety East Ridge (NER), with 2D seismic reflection profiles and multibeam bathymetry to assess the styles of faulting between the NER and the Sunda subduction zone, timing of activity and comparison with physical and rheological properties. We identify four distinct fault sets east of the NER in the northern Wharton Basin. N-S (350-010°) orientated faults, associated with the N-S fracture zones formed at...

Tipo: Text

Palavras-chave: Intraplate deformation; Indian Ocean; Diffuse plate boundary; IODP.

Ano: 2020

URL: https://archimer.ifremer.fr/doc/00617/72936/71957.pdf

A habitat-based simulation framework to design tag-recapture experiments for tunas in the Indian Ocean. Application to the skipjack (Katsuwonus pelamis) population.

A methodological framework to predict the individual and population‐level distributions from tracking data

Olivier, M.A.Y..

The IOTC initiated a discussion to organize a large scale tagging program concerning the major tropical tuna species and fisheries. According to the terms of reference for the working party on tagging (Anon., 1999), prospective simulations are needed to help designing tag -recapture experiments. The purpose of this paper is to present the methodology developed to help designing the future tagging program. It is based on three stages: tag recovery simulations with an habitat -based advection-diffusion-reaction model; bootstrapping of the recovery data sets; population parameter estimation and comparison of scenarii. Different scenarii are studied to check the reliability of the method and its ability to compare various t agging experimental designs....

Tipo: Proceedings Paper

Palavras-chave: Tagging Stock assessment Tuna fisheries Marking ISW; Indian Ocean.

Ano: 1998

URL: http://hdl.handle.net/1834/67

A new interstitial flatworm (Turbellaria: Promesostomidae) from the Indian Ocean

Chambault, Philippine; Hattab, Tarek; Mouquet, Pascal; Bajjouk, Touria; Jean, Claire; Ballorain, Katia; Ciccione, Stéphane; Dalleau, Mayeul; Bourjea, Jerome.

Despite the large number of species distribution modelling (SDM) applications driven by tracking data, individual information is most of the time neglected and traditional SDM approaches commonly focus on predicting the potential distribution at the species or population‐level. By running classical SDMs (population approach) with mixed models including a random factor to account for the variability attributable to individual (individual approach), we propose an innovative five‐steps framework to predict the potential and individual‐level distributions of mobile species using GPS data collected from green turtles. Pseudo‐absences were randomly generated following an environmentally‐stratified procedure. A negative exponential dispersal kernel was...

Tipo: Text

Palavras-chave: GPS tracking; Green turtles; Indian Ocean; Pseudo-absences; Shannon index; Spatial modelling.

Ano: 2021

URL: https://archimer.ifremer.fr/doc/00682/79412/81963.pdf

Clerck, G.G. De.

Paraproboscifer alacerregis, representing a new genus and a new species of the interstitial typloplanoid flatworms is described from the Seychelles and Kenya. It is placed in the turbellarian family Promesostomidae, The type locality is on Mahé Island, Seychelles.

A worldwide review of purse seine fisheries on FADs

Palavras-chave: Turbellaria; Typhloplanoida; Promesostomidae; Indian Ocean; Seychelles; Kenya.; 42.76.

Ano: 1994

URL: http://www.repository.naturalis.nl/record/317638

Analyse fonctionnelle des causes de rupture des DCP de la Réunion (océan Indien)

Fonteneau, Alain; Pallares, P; Pianet, Renaud.

This paper develops a comparative overview of the development of Fish Aggregating Devices (or fads) by the tropical purse seine fisheries in various ocean areas (Atlantic, Indian, Western and Eastern Pacific Oceans). First, a comparative review of fishery statistics is developed. Recent catches on fads by purse seiners can be estimated at a level of one million tons yearly. This comparison allows to describe the fishing zones and catch trends over time, the species composition and size taken in the various fad fisheries. Skipjack tuna is the dominant species in most fad fisheries, but significant amounts of yellowfin and bigeye are also frequently taken under fads. The paper also presents an overview of various observer data concerning the by-catches of...

Tipo: Text

Palavras-chave: Attracting techniques Fisheries Purse seines Size Tuna fisheries Article Geographic Terms: A; Atlantic I; Pacific ISW; Indian Ocean.

Ano: 2000

URL: http://archimer.ifremer.fr/doc/00042/15278/12664.pdf

Analysis of small-scale movements of yellowfin tuna around fish-aggregating devices (FADS) using sonic tags

Sacchi, Jacques; Tessier, E.

The development of the FAD gave rise to technical problems owing to their conception, their setting spot and of their utilisation. Failings generated by the unreliability of components or the uncertain repair precariousness, those can prove to be here more and more expensive with the progression of the ageing of devices and reasons of their loss. For as various domains that aerospace or the fishing deck layout, the engineering has functional analysis tools that permit to reduce conception uncertainties of systems by the mean of a hierarchical classification of function values of components. The application of one of these techniques, the FMEA, Failure Mode and Effects Analysis, to the study of reasons of FAD loss in La Reunion describes perfectly...

Tipo: Text

Palavras-chave: Analysis Attracting techniques Risks Tuna fisheries Article Geographic Terms: ISW; Indian Ocean ISW; Indian Ocean; Mascarene Is.; Reunion.

Ano: 2000

URL: http://archimer.ifremer.fr/doc/00042/15289/12675.pdf

Anisotropic Tomography Around La Reunion Island From Rayleigh Waves

Marsac, F.; Cayré, P.; Conand, F..

The ongoing ultrasonic experiments of phase 2 of the Regional Tuna Project (Commission de l'Ocean Indien) are reported and analysed in relation to the local environmental parameters. Although 7 yellowfin tuna (Thunnus albacares) were tagged during the first 3 cruises of the project, only 5 of them are considered in this paper, as they were tracked around FADs. Seasonal trends affect the horizontal movements associated with FADs: strong association and homing behaviour during the fishing season vs. weaker association when the fishing season comes to an end and the fish start migrating from the area. The vertical movements are analysed in order to provide a typology of the distribution of tuna in relation to different features (FAD association by day and at...

Tipo: Proceedings Paper

Palavras-chave: Tuna fisheries Fishery surveys Tagging Sonic tags Local movements Migrations Environmental conditions Thunnus albacares ISW; Indian Ocean.

Ano: 1996

URL: http://hdl.handle.net/1834/16

Mazzullo, Alessandro; Stutzmann, Eleonore; Montagner, Jean-paul; Kiselev, Sergey; Maurya, Satish; Barruol, Guilhem; Sigloch, Karin.

In the western Indian Ocean, the Reunion hot spot is one of the most active volcanoes on Earth. Temporal interactions between ridges and plumes have shaped the structure of the zone. This study investigates the mantle structure using data from the Reunion Hotspot and Upper Mantle-Reunions Unterer Mantel (RHUM-RUM) project, which significantly increased the seismic coverage of the western part of the Indian Ocean. For more than 1year, 57 ocean bottom seismometer stations and 23 temporary land stations were deployed over this area. For each earthquake station path, the Rayleigh wave fundamental mode phase velocities were measured for the periods from 30s to 300s and group velocities for the period from 16s to 250s. A three-dimensional model of the shear...

Tipo: Text

Palavras-chave: Tomography; Indian Ocean; Seismic anisotropy; Hot spot ridge; Upper mantle.

Ano: 2017

URL: https://archimer.ifremer.fr/doc/00600/71180/69533.pdf

Avian biogeography on western Indian Ocean islands: eustatic sea levels, geological events and anthropogenic changes

Hume, J.P..

The south-western Indian Ocean islands, excluding the microcontinent of Madagascar, are geologically complex and diverse. They have been subject to drastic sea level changes, volcanic events and anthropogenic changes, all of which have contributed to confuse understanding of their avian biogeography. An array of factors have affected these avifaunas, based on palaeontological, historical and molecular evidence,which together have shown that avian biogeography is not congruent with the relative age and size of the islands.

Behavior of dolphinfish (Coryphaena hippurus) around drifting FADs as observed from automated acoustic receivers

Palavras-chave: Aves; Biogeography; Indian Ocean; Palaeoecology; Geology; 42.83; 42.65.

Ano: 2011

URL: http://www.repository.naturalis.nl/record/428484

Bimeria vestita (Hydrozoa: Anthomedusae: Bougainvilliidae) senior synonym of Eudendrium vestitum (Hydrozoa: Anthomedusae: Eudendriidae)

Taquet, Marc; Dagorn, L; Gaertner, J; Girard, C; Aumerruddy, R; Sancho, G; Itano, D.

To study the behavior of dolphinfish (Coryphaena hippurus) around drifting Fish Aggregating Devices (FADs), we tagged individuals with long-lived, coded sonic transmitters and attached automated sonic receivers to drifting FADs in two regions of the Western Indian Ocean. Among the three tagging methods used in this study (surgery, external hooks, underwater bait without capture), the latest resulted in residence times significantly shorter than the other ones, likely due to regurgitation. Dolphinfish tagged with the two other methods usually stayed several days associated to FADs (Kaplan-Meier survival analysis 5.09 days, mean 6.25 days, SD 4.39 days, maximum 15.26 days), drifting with them. There was no significant difference in the residence times of...

Tipo: Text

Palavras-chave: Indian Ocean; Meeting point; Ecological trap; Behavior of fish; Ultrasonic telemetry; Acoustic tagging; FAD; Dolphinfish.

Ano: 2007

URL: http://archimer.ifremer.fr/doc/2007/publication-3733.pdf

Marques, A.C.; Mergner, H.; Höinghaus, R.; Vervoort, W..

After studying the type specimens we conclude that the species Eudendrium vestitum Allman, 1888, is a junior synonym of the cosmopolitan bougainvilliid Bimeria vestita Wright, 1859. A redescription accompanied by optical micro- and SEM photographs of the species is presented.

Bycatch in the purse seine tuna fisheries in the western Indian Ocean.

Palavras-chave: Hydrozoa; Bimeria; Eudendrium; Taxonomy; Indian Ocean; Heard Island; Synonymy; 42.79.

Ano: 2000

URL: http://www.repository.naturalis.nl/record/216178

Calculation of the Nominal Catches of vessels Not Elsewhere Included (NEI) within the IOTC Area.

Romanov, E.V..

The yield of associated and dependent species taken as bycatch by the purse seine tuna fishery from the Indian Ocean pelagic ecosystem is estimated from data collected by scientific observers aboard Soviet purse seiners in the Western Indian Ocean (WIO), 1986-1992. A total of 494 sets on free swimming schools, whale shark associated schools, whale associated schools, and log associated schools were analyzed. More than 40 fish species and other marine animals were registered. Among them only two species, yellowfin and skipjack tunas, are target species. Average levels of non-tuna bycatch equal 0.518 t per set, 27.2 t for 1,000 t of target species. By the author’s estimates, the annual catch of yellowfin and skipjack tunas in 1990-1995 of the total...

Tipo: Proceedings Paper

Palavras-chave: Tuna fisheries By-catch Purse seining ISW; Indian Ocean.

Ano: 1998

URL: http://hdl.handle.net/1834/45

Catch status of tropical tunas and swordfish by Taiwan deep sea tuna fishery in the Indian ocean in 1999.

IOTC.

The acronym NEI (Not Elsewhere Included) has usually been used to record the catches by vessels or fleets which are not officially reported to the IOTC.

Tipo: Proceedings Paper

Palavras-chave: Catch statistics Fishing vessels ISW; Indian Ocean.

Ano: 2000

URL: http://hdl.handle.net/1834/41

Cephalopods from the Netherlands Indian Ocean Programme (NIOP) (Expeditions 1992-1993)

Chang, S.K.; Liu, H.C..

There were about 341 deep-sea longliners operating in the Indian Ocean (small longliners operating in the northeast Indian Ocean were not included) in 1999, about the same level to 1998. The total catch made by these longliners was roughly estimated as 99,000 MT, a decrease of about 11,000 MT from 1998. The drop of yellowfin tuna by 5,700 MT was the main cause, followed by decreases of bigeye tuna by 2,600 MT and swordfish by 2,100 MT. This decrease in catch might be due to the unfavorable fishing condition around the traditional fishing grounds in the Indian Ocean. In general, the total catch of tunas and billfishes was around 93,000-110,000 MT from 1992 to the present except the relatively high catch in 1993. 'Research Group' Overseas Fisheries...

Tipo: Proceedings Paper

Palavras-chave: Catch statistics Tuna fisheries Longlining Catching method ISW; Indian Ocean.

Ano: 2000

URL: http://hdl.handle.net/1834/72

Salcedo-Vargas, Mario Alejandro.

Cephalopods of the Red Sea, Gulf of Aden and the Western Indian ocean off Somalia are studied. A preliminary annotated list is presented. This study was based on the examination of 381 specimens captured with a Rectangular Midwater Trawl (RMT8) during three cruises of the Netherlands Indian Ocean Programme. The taxa identified represent: 22 families, 35 genera and 56 species. Two species new to science are found. Systematic position and taxonomic re-evaluation in the Chiroteuthidae, Mastigoteuthidae and Octopodidae is briefly discussed. The present collections represent a valuable contribution to the species composition from the Western Indian Ocean and to cephalopod juvenile morphology.

Characterizing fish communities associated with drifting fish aggregating devices (FADs) in the Western Indian Ocean using underwater visual surveys

Palavras-chave: Cephalopoda; Taxonomic list; Indian Ocean; Red Sea.

Ano: 1994

URL: http://www.repository.naturalis.nl/record/505359

Characterizing fish communities associated with drifting fish aggregating devices (FADs) in the Western Indian Ocean using underwater visual surveys

Taquet, Marc; Sancho, G; Dagorn, L; Gaertner, J; Itano, D; Aumeeruddy, R; Wendling, B; Peignon, C.

We adapted a visual census method, mainly used in demersal and reef fish studies, to characterize fish communities associated to drifting fish aggregating devices (FADs) in the Western Indian Ocean. Drifting FAD associated fishes from both equatorial (Seychelles) and tropical waters (Reunion Island) were examined by divers. A total of 32 species (belonging to 16 families) were observed associated with drifting FADs in equatorial waters, and 24 species (14 families) were found around FADs in tropical waters. Twenty species were found in both regions. The highest number of species observed at a single FAD was 18 (12 +/- 2, mean +/- SD) in equatorial and 13 (10 +/- 3) in tropical waters, not counting circumnatant species loosely associated with the FAD. Some...

Tipo: Text

Palavras-chave: Indian Ocean; Reunion Island; Seychelles; Fish aggregations; Visual census; Drifting FAD; Pelagic fishes.

Ano: 2007

URL: https://archimer.ifremer.fr/doc/00602/71370/69818.pdf

Chitons (Mollusca: Polyplacophora) from the Seychelles with description of a new species

Taquet, Marc; Sancho, G; Dagorn, L; Gaertner, J; Itano, D; Aumeeruddy, R; Wendling, B; Peignon, C.

Tipo: Text

Palavras-chave: Indian Ocean; Reunion Island; Seychelles; Fish aggregations; Visual census; Drifting FAD; Pelagic fishes.

Ano: 2007

URL: http://archimer.ifremer.fr/doc/2007/publication-3734.pdf

Kaast, P..

Notes are given on nine chiton species, collected mainly during the 'Oceanic Reefs' Expedition to the Seychelles (1992-1993), with some biogeographical observations. Ischnochiton goudi (family Ischnochitonidae) is described as a new species.

Chitons (Mollusca: Polyplacophora) procured by the French Benthédi-expédition, 1977, and the Md 32-réunion-expédition, 1982, in the Southwestern Indian Ocean

Palavras-chave: Polyplacophora; Indian Ocean; Seychelles; Leptochiton; Ischnochiton; Schizochiton; Chiton; Acanthopleura; Lucilina; Acanthochitona; Cryptoplax; 42.73.

Ano: 1996

URL: http://www.repository.naturalis.nl/record/319379

Kaas, P..

The late Eugène Leloup examined samples from five stations of the Benthédi-Expédition, 1977, in the North of the Mozambique Channel, containing four species of chitons, two of which proved to be new to science. The material here discussed, coming from eighteen Benthédistations, proved to contain fourteen species, among which the four previously reported by Leloup (1981), and two hitherto unknown, here described as Leptochiton (Leptochiton) gloriosus spec, nov. and Ischnochiton (Ischnochiton) crassus spec. nov. The Réunion material came from nine stations and contains five species of chitons, two of which are new, viz. Leptochiton (Leptochiton) kurnilatus spec. nov. and Ischnochiton (Stenosemus) vitreolus spec. nov.