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| Registros recuperados: 49 | |
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| Merenlender, Adina; University of California, Berkeley; adina@nature.berkeley.edu; Kremen, Claire; Center for Conservation Biology and Wildlife Conservation Society; ckremen@leland.Stanford.EDU; Rakotondratsima, Marius; Wildlife Conservation Society, Madagascar; mphrl@ukc.ac.uk; Weiss, Andrew; Center for Conservation Biology; aweiss@bing.stanford.edu. |
| Monitoring the influence of human actions on flagship species is an important part of conserving biodiversity, because the information gained is crucial for the development and adaptation of conservation management plans. On the Masoala Peninsula in Madagascar, we are monitoring the two largest prosimian species, Eulemur fulvus albifrons and Varecia variegata rubra, at disturbed and undisturbed forest sites to determine if extraction of forest resources has a significant impact on the population viability of these species. To test the sensitivity of lemur species to routine extraction of natural resources by local villagers, we compared population demography and density for both species across six study sites, using a new census technique. Three of the... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Biodiversity; Buffer zone; Census techniques; Conservation; Eulemur fulvus albifrons; GIS; Lemurs; Madagascar; National park; Natural resource extraction; Primate; Protected area management; Varecia variegata rubra. |
| Ano: 1998 |
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| Raik, Daniela B; Cornell University; dbr23@cornell.edu; Decker, Daniel J; Cornell University; djd6@cornell.edu. |
| Community-based forest management has proliferated throughout Africa as national governments have decentralized the administration of public forestry. Community-based forestry has taken multiple forms, depending on the assortment of land-tenure systems, forest-use norms, wood demand, and social organization, among others factors. Nature, Wealth, and Power is an analytical framework that has been developed from experiences in natural resource management in Africa. In this paper, we amend the framework to People, Nature, Wealth, and Power (PNWP), and propose it as an analytical lens for community-based forest management initiatives. We use the PNWP framework to assess the responsiveness of contractual forest management in the Menabe region of Madagascar to... |
| Tipo: Peer-Reviewed Insight |
Palavras-chave: Community-based forest management; Decentralization; Forestry; Madagascar. |
| Ano: 2007 |
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| Pratt, Martin J.; Wysession, Michael E.; Aleqabi, Ghassan; Wiens, Douglas A.; Nyblade, Andrew A.; Shore, Patrick; Rambolamanana, Gerard; Andriampenomanana, Fenitra; Rakotondraibe, Tsiriandrimanana; Tucker, Robert D.; Barruol, Guilhem; Rindraharisaona, Elisa. |
| The crust and upper mantle of the Madagascar continental fragment remained largely unexplored until a series of recent broadband seismic experiments. An island-wide deployment of broadband seismic instruments has allowed the first study of phase velocity variations, derived from surface waves, across the entire island. Late Cenozoic alkaline intraplate volcanism has occurred in three separate regions of Madagascar (north, central and southwest), with the north and central volcanism active until <1 Ma, but the sources of which remains uncertain. Combined analysis of three complementary surface wave methods (ambient noise, Rayleigh wave cross-correlations, and two-plane-wave) illuminate the upper mantle down to depths of 150 km. The phase-velocity... |
| Tipo: Text |
Palavras-chave: Surface wave; Ambient noise; Tomography; Madagascar; Intraplate volcanism. |
| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00600/71182/69528.pdf |
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| Descombes, Patrice; Leprieur, Fabien; Albouy, Camille; Heine, Christian; Pellissier, Loic. |
| Aim In interaction with past climate changes, it is likely that plate tectonics contributed to the shaping of current global species diversity, but so far this has not been statistically quantified at the global level. Here, we tested whether plate tectonics since the breakup of Gondwana left an imprint on current patterns of species richness of amphibians, birds and mammals. Location Global. Methods We reconstructed the absolute positions of continental plates since the Early Cretaceous and used this information to derive variables of latitudinal shifts and potential exchanges among landmasses that could have modulated species richness. Using a multi-model inference approach combining both contemporary and historical variables, we quantified the... |
| Tipo: Text |
Palavras-chave: Amphibian; Bird; Continental drift; Diversity; Indo-Pacific; Madagascar; Mammal; Plate tectonics; Southeast Asia; Wallace line. |
| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00373/48413/48711.pdf |
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| Bousquet, Olivier; Lees, Edouard; Durand, Jonathan; Peltier, Aline; Duret, Anne; Mekies, Dominique; Boissier, Patrice; Donal, Thomas; Fleischer-dogley, Frauke; Zakariasy, Lova. |
| In the frame of the research project IOGA4MET, a new ground-based GNSS network is being deployed in the Southwest Indian Ocean (SWIO) since November 2017. This new network opens up for new research opportunities in geodesics and atmospheric sciences in this area regularly exposed to natural hazards, and significantly expands the International GNSS System (IGS) network, which only includes eight stations so far in the SWIO. After a description of the current status of IOGA4MET, several examples of regional applications in meteorology (climatology and numerical modeling) and geodesy (monitoring of ground deformations) are presented using data collected in northern Madagascar and small neighboring islands in 2018–2020. The observed water vapor cycle is shown... |
| Tipo: Text |
Palavras-chave: Southwest Indian Ocean; GNSS - Global Navigation Satellite System; Water vapor cycle; Madagascar; Mayotte; Geodesy; NWP (numerical weather prediction); AROME Indian Ocean. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00651/76324/77302.pdf |
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| Vacelet, Jean; Cardenas, Paco. |
| Discorhabdella pseudaster n. sp. is an incrusting sponge from the upper bathyal zone of the 'Banc du Geyser', north of Madagascar, Mozambique Channel This new species is described only from a single specimen but it is remarkable by the presence of spicules similar to euasters, a type of microsclere unknown in Poecilosclerida. These spicules are in fact a new example of homoplasy, being derivatives of the typical Discorhabdella pseudoastrose acanthostyles, which are here reduced to the aster-like tyles. The isochelae with a large lamella on the shaft are also quite unique in Poeciloclerida. |
| Tipo: Text |
Palavras-chave: Porifera; New species; Madagascar; Bathyal; Homoplasy. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00688/79995/82965.pdf |
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| Le Groumellec, Marc; Rigolet, Vincent; Panchayuthapani, Duraisamy; Vandeputte, Marc; Rao, Vemulapalli Manavendra. |
| The shrimp farming industry in the western Indian Ocean started with Aqualma’s project in 1989, and now several companies farm shrimp in the Mozambique Channel. Despite the remoteness of these projects and their high investment and operating costs, they compete in the global marketplace by efficiently producing high value quality products. To address sustainability and biosecurity issues, Aqualma developed domesticated specific pathogenfree (SPF) broodstock of Penaeus monodon from western Indian Ocean stocks, which have been its exclusive source of post-larvae since 2003. Specific molecular diagnostic tools have been developed for each endemic pathogen detected since 1996, and these are used for routine surveillance of Aqualma’s shrimp stocks along with... |
| Tipo: Text |
Palavras-chave: Shrimp; Madagascar; Domestication; Biosecurity; Certification. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00099/20980/18604.pdf |
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| Tsang-hin-sun, Eve; Evain, Mikael; Julia, J; Lamarque, G; Schnurle, Philippe. |
| This study investigates the seismic structure and anisotropy in the crust beneath Madagascar and south-eastern Africa, using receiver functions. The understanding of seismic anisotropy is essential for imaging past and present deformation in the lithosphere-asthenosphere system. In the upper mantle, seismic anisotropy mainly results from the orientation of olivine, which deforms under tectonic (fossil anisotropy) or flow processes (in the asthenosphere). In the crust, the crystallographic alignment of amphiboles, feldspars(plagioclase) or micas or the alignment of heterogeneities such as fractures, add to a complex geometry, which results in challenges to understanding the Earth's shallow structure. The decomposition of receiver functions into back-azimuth... |
| Tipo: Text |
Palavras-chave: Crustal seismic anisotropy; Inherited structural heterogeneities; Crustal stress; Receiver function harmonics; Madagascar; Africa; EARS. |
| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00686/79843/82668.pdf |
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| Randrianarivelo, Roger; Sarter, Sarnira; Odoux, Eric; Brat, Pierre; Lebrun, Marc; Romestand, Bernard; Menut, Chantal; Andrianoelisoa, Hanitriniaina Sahondra; Raherimandimby, Marson; Danthu, Pascal. |
| Essential oil samples of Cinnamosma fragrans from two regions in Madagascar, Tsaramandroso (38 samples) and Mariarano (30 samples), were analysed by GC/MS. Fifty-seven components were identified, accounting from 88.3% to 99.4% of the oils' composition. The major components were linalool (72.5 +/- 23.3%) in Tsaramandroso and 1,8-cineole (47.3 +/- 10.2%) in Mariarano. Samples B8 (95.8% linalool) from Tsaramandroso and B143 (71.6% 1,8-cineole) from Mariarano containing the highest proportions of the two main components identified, were selected to determine antimicrobial activities against 10 microbial strains. Bacillus subtilis and Staphylococcus aureus were the most sensitive strains to both oils. Minimum inhibitory concentration (MIC) values were lower for... |
| Tipo: Text |
Palavras-chave: Madagascar; 1.8 Cineole; Linalool; Antimicrobial activity; Essential oil; Cinnamosma fragrans. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-6242.pdf |
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| Gravier-Bonnet, N.. |
| The present collection was made on the south and west coasts of Madagascar between 90 en 465 meters depth and includes 17 species of calyptoblastic hydroids, belonging to six families: Campanulinidae, Lafoeidae, Campanulariidae, Syntheciidae, Sertulariidae and Plumulariidae. Twelve are recorded for the first time from Madagascar, while three of these are new for the Indian Ocean and one is described as new (Tulpa costata). Endemic species represent half of the collection and are numerically more important than cosmopolitan, tropical-indopacific, and southern species. A comparative study of bathymetrical characteristics of species from Madagascar and around the world allows to distinguish three groups of species: deepsea species, which have a very wide... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Coelenterata; Hydrozoa; Madagascar; New species; Revision; Halicornaria ferlusi Billard; Temporary epizoism; 42.72. |
| Ano: 1979 |
URL: http://www.repository.naturalis.nl/record/323945 |
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| Registros recuperados: 49 | |
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