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Journal articles on the topic 'Morondava'

Author: Grafiati
Published: 4 June 2021
Last updated: 5 February 2022

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1

Delatte, H., B. Reynaud, J. M. Lett, M. Peterschmitt, M. Granier, J. Ravololonandrianina, and W. R. Goldbach. "First Molecular Identification of a Begomovirus Isolated from Tomato in Madagascar." Plant Disease 86, no. 12 (December 2002): 1404. http://dx.doi.org/10.1094/pdis.2002.86.12.1404c.

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In April 2001, reduced leaf size, leaf curling, yellowing symptoms, and reduced yield were observed in tomato plants in the southwestern (Toliary, Morondava, Miandrivazo) and northern (Antsiranana) regions of Madagascar. Symptoms were similar to those caused by Tomato yellow leaf curl virus (TYLCV, genus Begomovirus, family Geminiviridae). Large populations of Bemisia tabaci (Gennadius) were observed colonizing tomato, other crops, and weeds. Leaf samples were collected from tomato plants from 14 sites located in northern, central, and southern Madagascar. Two plant samples collected near Antsiranana, one sample near Morondava, and one sample near Toliary were positive in triple-antibody sandwich enzyme-linked immunosorbent assay using a begomovirus-specific antibody purchased from ADGEN (Nellies Gates, Auchincruive, Scotland, UK). A 500-bp product was amplified and cloned (2) from two leaf samples collected near Toliary and one near Morondava using a pair of degenerate primers that are expected to amplify a region of the A component of begomoviruses between the intergenic conserved nonanucleotide sequence and the first 200 nucleotides of the coat protein ORF. The sequences corresponding to the two Toliary samples (GenBank Accession Nos. AJ422123 and AJ422124) and the Morondava sample (GenBank No. AJ422125) showed the most significant alignments (NCBI, BLAST) with begomoviruses, Tobacco leaf curl virus from Zimbabwe (GenBank Accession No. AF 350330) and Tomato leaf curl virus from Tanzania (GenBank Accession No. U73498) with 76 to 77% nucleotide identity (Clustal method, MegAlign, DNASTAR, London) and South African cassava mosaic viruses (SACMV GenBank Accession Nos. AJ422132 and AF155806) and East African cassava mosaic viruses from Malawi (GenBank Accession Nos. AJ006459 and AJ006460) with 74 to 75.5% nucleotide identity. The low nucleotide identity suggests that the begomovirus isolated from tomato in Madagascar is a new species. Since the core region of the coat protein gene is a molecular marker for provisional classification of begomoviruses (1), this region was amplified for the Morondava isolate with degenerate primers. The 519nt core fragment obtained showed the most significant alignments with SACMV (GenBank Accession No. AF329227), Cassava geminivirus from Mozambique (GenBank Accession No. AF329240), and with TYLCV (GenBank Accession Nos. AB014346 and AF105975) with 81 to 82% nucleotide identity. According to the current taxonomic criteria (4), the begomovirus from Madagascar is a new one that is related to begomoviruses from the southern part of Africa and to TYLCV and is provisionally named Tomato yellow leaf curl Morondava virus (TYLCMV). Tomato yellow leaf curl disease was previously described in Madagascar by Reckhaus (3) who presumed that it was caused by TYLCV. Although symptoms in the tomato plant from which TYLCMV was isolated were similar to those induced by TYLCV, TYLCV was not detected in our samples. References: (1) J. K. Brown et al. Arch. Virol. 146:1581, 2001 (2) M. Peterschmitt et al. Plant Dis. 83:303, 1999. (3) P. Reckhaus, Maladies et ravageurs des cultures maraîchères: A l'exemple de Madagascar. GTZ, Weikersem, 1997. (4) M. H. V. van Regenmortel et al. Virus Taxonomy. Seventh Rep. Int. Comm. Taxon. Viruses. Academic Press, San Diego, 2000.
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2

Kennedy, William James, Ireneusz Walaszczyk, Andrew S. Gale, Krzysztof Dembicz, and Tomasz Praszkier. "Lower and Middle Cenomanian ammonites from the Morondava Basin, Madagascar." Acta Geologica Polonica 63, no. 4 (December 1, 2013): 625–55. http://dx.doi.org/10.2478/agp-2013-0027.

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ABSTRACT Kennedy, W.J., Walaszczyk, I., Gale, A.S., Dembicz, K. and Praszkier, T. 2013. Lower and Midle Cenomanian ammonites from the Morondava Basin, Madagascar. Acta Geologica Polonica, 63(4), 625-655. Warszawa. Lower and Middle Cenomanian ammonite assemblages have been collected on a bed-by-bed basis from localities at Vohipaly and Mahaboboka, Madagascar, as well as from outcrops around Berekata, all in the Morondava Basin, southwest Madagascar. These collections demonstrate the presence of the upper Lower Cenomanian Mantelliceras dixoni Zone and the lower Middle Cenomanian Cunningtoniceras inerme Zone of the north-western European standard sequence. These records indicate that the striking anomalies in the zonal assemblages of the classic divisions of the Madagascan Cenomanian are based on mixed assemblages, rather than a succession that differs radically from that elsewhere in the world. The dixoni Zone fauna is: Desmoceras cf. latidorsatum (Michelin, 1838), Pachydesmoceras kossmati Matsumoto, 1987, Forbesiceras sp., F. baylissiWright & Kennedy, 1984, F. largilliertianum (d’Orbigny, 1841), Mantelliceras cantianum Spath, 1926a, M. dixoni Spath, 1926b, M. mantelli (J. Sowerby, 1814), M. picteti Hyatt, 1903, M. saxbii (Sharpe, 1857), Sharpeiceras sp., S. falloti (Collignon, 1931), S. mocambiquense (Choffat, 1903), S. cf. florencae Spath, 1925, Acompsoceras renevieri (Sharpe, 1857), A. tenue Collignon, 1964, Calycoceras sp., Mrhiliceras lapparenti (Pervinquière, 1907), Mariella (Mariella) stolizcai (Collignon, 1964), Hypoturrilites taxyfabreae (Collignon, 1964), Turrilites scheuchzerianus Bosc, 1801, Sciponoceras cucullatum Collignon, 1964, and Sciponoceras antanimangaensis (Collignon, 1964). The presence of Calycoceras in a Lower Cenomanian association represents a precocious appearance of a genus typically Middle and Upper Cenomanian in occurrence, and matches records from Tunisia. The inerme Zone yields a more restricted assemblage: Pachydesmoceras kossmati, Forbesiceras baylissi, Acanthoceras sp. juv., Cunningtoniceras cunningtoni (Sharpe, 1855) and Hypoturrilites taxyfabreae.
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3

Bardintzeff, J. M., B. Bonin, and G. Rasamimanana. "The Cretaceous morondava volcanic province (West Madagascar): mineralogical, petrological and geochemical aspects." Journal of African Earth Sciences 32, no. 2 (February 2001): 299–316. http://dx.doi.org/10.1016/s0899-5362(01)90008-9.

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4

Sorg, Jean-Pierre. "Organisation de la recherche dans les zones sèches un cas concret dans l'ouest de Madagascar | Design of Forest Research in Dry Zones -a Case Study in the West of Madagascar." Schweizerische Zeitschrift fur Forstwesen 151, no. 3 (March 1, 2000): 84–86. http://dx.doi.org/10.3188/szf.2000.0084.

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An interesting research programme focusing on trees and forest,which has been continuing in the region of Morondava for more than 20 years, presently finds itself in an environment somewhat unfavourable for research and, therefore, is in an evaluative phase. While at the beginning the emphasis was strongly put on forestry, the programme developed more and more towards the interface mankind – forest, and through social-forestry activities progressively towards the population of the villages. Today, it is clear that research on participative management of forests and the scientific interest in natural eco-systems and their dynamics are complementary and have to be co-ordinated with regard to sustainability.
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5

Rindraharisaona, E. J., F. Tilmann, X. Yuan, J. Dreiling, J. Giese, K. Priestley, and G. Rümpker. "Velocity structure and radial anisotropy of the lithosphere in southern Madagascar from surface wave dispersion." Geophysical Journal International 224, no. 3 (November 17, 2020): 1930–44. http://dx.doi.org/10.1093/gji/ggaa550.

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SUMMARY We investigate the upper mantle seismic structure beneath southern Madagascar and infer the imprint of geodynamic events since Madagascar’s break-up from Africa and India and earlier rifting episodes. Rayleigh and Love wave phase velocities along a profile across southern Madagascar were determined by application of the two-station method to teleseismic earthquake data. For shorter periods (<20 s), these data were supplemented by previously published dispersion curves determined from ambient noise correlation. First, tomographic models of the phase velocities were determined. In a second step, 1-D models of SV and SH wave velocities were inverted based on the dispersion curves extracted from the tomographic models. As the lithospheric mantle is represented by high velocities we identify the lithosphere–asthenosphere boundary by the strongest negative velocity gradient. Finally, the radial anisotropy (RA) is derived from the difference between the SV and SH velocity models. An additional constraint on the lithospheric thickness is provided by the presence of a negative conversion seen in S receiver functions, which results in comparable estimates under most of Madagascar. We infer a lithospheric thickness of 110−150 km beneath southern Madagascar, significantly thinner than beneath the mobile belts in East Africa (150−200 km), where the crust is of comparable age and which were located close to Madagascar in Gondwanaland. The lithospheric thickness is correlated with the geological domains. The thinnest lithosphere (∼110 km) is found beneath the Morondava basin. The pre-breakup Karoo failed rifting, the rifting and breakup of Gondwanaland have likely thinned the lithosphere there. The thickness of the lithosphere in the Proterozoic terranes (Androyen and Anosyen domains) ranges from 125 to 140 km, which is still ∼30 km thinner than in the Mozambique belt in Tanzania. The lithosphere is the thickest beneath Ikalamavony domain (Proterozoic) and the west part of the Antananarivo domain (Archean) with a thickness of ∼150 km. Below the eastern part of Archean domain the lithosphere thickness reduces to ∼130 km. The lithosphere below the entire profile is characterized by positive RA. The strongest RA is observed in the uppermost mantle beneath the Morondava basin (maximum value of ∼9 per cent), which is understandable from the strong stretching that the basin was exposed to during the Karoo and subsequent rifting episode. Anisotropy is still significantly positive below the Proterozoic (maximum value of ∼5 per cent) and Archean (maximum value of ∼6 per cent) domains, which may result from lithospheric extension during the Mesozoic and/or thereafter. In the asthenosphere, a positive RA is observed beneath the eastern part Morondava sedimentary basin and the Proterozoic domain, indicating a horizontal asthenospheric flow pattern. Negative RA is found beneath the Archean in the east, suggesting a small-scale asthenospheric upwelling, consistent with previous studies. Alternatively, the relatively high shear wave velocity in the asthenosphere in this region indicate that the negative RA could be associated to the Réunion mantle plume, at least beneath the volcanic formation, along the eastern coast.
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6

Nichols, G. J., and M. C. Daly. "Sedimentation in an intracratonic extensional basin: the Karoo of the Central Morondava Basin, Madagascar." Geological Magazine 126, no. 4 (July 1989): 339–54. http://dx.doi.org/10.1017/s0016756800006543.

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AbstractThe late Carboniferous to Triassic Karoo Supergroup of Madagascar is a sequence of predominantly continental clastic sediments deposited during a long period of regional crustal extension. In the Morondava Basin of western Madagascar the lower two divisions of the Karoo sediments – the Sakoa and the Sakamena – are deposits of fluvial and lacustrine sedimentation systems supplied from the Precambrian metamorphic basement terrain to the east. East–west crustal extension produced a series of graben and half-graben structures after the Sakoa period which were reactivated after the Sakamena. The position and orientation of these half graben, which were marginal to a larger rift system to the west, were partly controlled by the steep NNE–SSW mylonitic fabric in the metamorphic basement. Palaeocurrents in the braided river deposits of the Sakoa and Lower Sakamena indicate flow to the southwest and west in both sequences. The rivers followed a regional palaeoslope to the southwest/west and were apparently not significantly influenced by the local structural trends which were oriented perpendicular to this slope. The absence of local structural control is attributed to extensive erosional events which followed each tectonic episode and preceded the onset of further sedimentation which took place on an essentially peneplained surface. The tectonic episodes brought about changes in base level which caused this part of the basin to fluctuate between erosion and deposition.
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7

Schandelmeier, H., F. Bremer, and H. G. Holl. "Kinematic evolution of the Morondava rift basin of SW Madagascar––from wrench tectonics to normal extension." Journal of African Earth Sciences 38, no. 4 (March 2004): 321–30. http://dx.doi.org/10.1016/j.jafrearsci.2003.11.002.

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8

Giese, Jörg, Diane Seward, and Guido Schreurs. "Low-temperature evolution of the Morondava rift basin shoulder in western Madagascar: An apatite fission track study." Tectonics 31, no. 2 (March 23, 2012): n/a. http://dx.doi.org/10.1029/2011tc002921.

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9

Geiger, Markus, and Günter Schweigert. "Toarcian–Kimmeridgian depositional cycles of the south-western Morondava Basin along the rifted continental margin of Madagascar." Facies 52, no. 1 (February 14, 2006): 85–112. http://dx.doi.org/10.1007/s10347-005-0039-8.

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10

Wescott, William A., and John N. Diggens. "Depositional history and stratigraphical evolution of the Sakoa Group (Lower Karoo Supergroup) in the southern Morondava Basin, Madagascar." Journal of African Earth Sciences 24, no. 4 (May 1997): 585–601. http://dx.doi.org/10.1016/s0899-5362(97)00082-1.

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11

Wescott, William A., and John N. Diggens. "Depositional history and stratigraphical evolution of the Sakamena group (Middle Karoo Supergroup) in the southern Morondava Basin, Madagascar." Journal of African Earth Sciences 27, no. 3-4 (October 1998): 461–79. http://dx.doi.org/10.1016/s0899-5362(98)00073-6.

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12

Rakotonirainy, Nivo Heritiana, Valérie Razafindratovo, Chitale Rabaoarisoa Remonja, Randza Rasoloarijaona, Patrice Piola, Charlotte Raharintsoa, and Rindra Vatosoa Randremanana. "Dietary diversity of 6- to 59-month-old children in rural areas of Moramanga and Morondava districts, Madagascar." PLOS ONE 13, no. 7 (July 13, 2018): e0200235. http://dx.doi.org/10.1371/journal.pone.0200235.

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13

Gioan, Pierre, Josephine Rasendrasoa, Jacques-Marie Bardintzeff, and Georges Rasamimanana. "Nouvelles données pétrographiques et structurales sur le magmatisme du Sud du bassin de Morondava (Sud-Ouest de Madagascar)." Journal of African Earth Sciences 22, no. 4 (May 1996): 597–608. http://dx.doi.org/10.1016/0899-5362(96)00031-0.

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14

Rasamimanana, Georges, Jacques-Marie Bardintzeff, Joséphine Rasendrasoa, Hervé Bellon, Catherine Thouin, Pierre Gioan, and Alain Piqué. "Les épisodes magmatiques du Sud-Ouest de Madagascar (bassin de Morondava), marqueurs des phénomènes de rifting crétacé et néogène." Comptes Rendus de l'Académie des Sciences - Series IIA - Earth and Planetary Science 326, no. 10 (May 1998): 685–91. http://dx.doi.org/10.1016/s1251-8050(98)80179-1.

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15

Geiger, Markus, David Norman Clark, and Wolfgang Mette. "Reappraisal of the timing of the breakup of Gondwana based on sedimentological and seismic evidence from the Morondava Basin, Madagascar." Journal of African Earth Sciences 38, no. 4 (March 2004): 363–81. http://dx.doi.org/10.1016/j.jafrearsci.2004.02.003.

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Piqué, Alain, Edgard Laville, Gérard Bignot, Mamy Rabarimanana, and Catherine Thouin. "L'ouverture et le développement du bassin de Morondava (Madagascar) du Carbonifère supérieur au Jurassique moyen. Données stratigraphiques, sédimentaires, paléontologiques et structurales." Journal of African Earth Sciences 28, no. 4 (May 1999): 931–48. http://dx.doi.org/10.1016/s0899-5362(99)00070-6.

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17

Fortuny, Josep, Thomas Arbez, Eudald Mujal, and J. Sébastien Steyer. "Reappraisal of ‘Metoposaurus hoffmani’ Dutuit, 1978, and description of new temnospondyl specimens from the Middle–Late Triassic of Madagascar (Morondava Basin)." Journal of Vertebrate Paleontology 39, no. 1 (January 2, 2019): e1576701. http://dx.doi.org/10.1080/02724634.2019.1576701.

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18

Walaszczyk, Ireneusz, William James Kennedy, Krzysztof Dembicz, Andrew S. Gale, Tomasz Praszkier, Armand H. Rasoamiaramanana, and Hasina Randrianaly. "Ammonite and inoceramid biostratigraphy and biogeography of the Cenomanian through basal Middle Campanian (Upper Cretaceous) of the Morondava Basin, western Madagascar." Journal of African Earth Sciences 89 (January 2014): 79–132. http://dx.doi.org/10.1016/j.jafrearsci.2013.10.007.

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19

Lett, J. M., H. Delatte, F. Naze, B. Reynaud, A. L. Abdoul-Karime, and M. Peterschmitt. "A New Tomato leaf curl virus from Mayotte." Plant Disease 88, no. 6 (June 2004): 681. http://dx.doi.org/10.1094/pdis.2004.88.6.681b.

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In June 2003, symptoms of stunting and leaf curling resembling symptoms of tomato leaf curl disease, as well as reductions in yields, were observed on tomato plants in the western (Combani and Kahani) and eastern (Dembeni, Kaoueni, and Tsararano) regions of Mayotte, a French island in the Comoros Archipelago located in the northern part of the Mozambique Channel. The whitefly, Bemisia tabaci (Gennadius), was observed colonizing tomato plants and other vegetable crops at low levels. Overall, 13 leaf samples with symptoms were collected from tomato plants among the five regions and tested for the presence of begomoviruses using a polymerase chain reaction (PCR) assay with two sets of degenerate primers designed to amplify two regions of the A component of begomoviruses. Primers MP16 and MP82 amplify an approximately 500-bp fragment located between the intergenic conserved nonanucleotide sequence and the first 200 bp of the coat protein (CP) gene (2). Primers AV494 and AC1048 amplify the approximately 550-bp core region of the CP gene (3). Six leaf samples, one from Combani, three from Dembeni, and two from Kahani, gave a PCR product of the expected size with both sets of primers. No PCR products were obtained with degenerate primers designed for begomovirus DNA B or β. The approximately 500- and 550-bp PCR products from one sample each of Combani (EMBL Accession Nos. AJ620912 and AJ620915, respectively), Dembeni (EMBL Accession Nos. AJ620911 and AJ620914, respectively), and Kahani (EMBL Accession Nos. AJ620913 and AJ620916, respectively) were sequenced. For the 489-bp sequences obtained with the MP16/MP82 primer set, the three isolates had 90 to 95% nucleotide identity (DNAMAN; Lynnon BioSoft, Quebec). The most significant sequence alignments (NCBI and BLAST) were with begomoviruses; 80 to 83% nucleotide identity was obtained with the Tomato yellow leaf curl Morondava virus (TYLCMV) isolates from Madagascar (EMBL Accession Nos. AJ422123 and AJ422124), 80 to 82% nucleotide identity was obtained with the South African cassava mosaic virus (SACMV) isolates (GenBank and EMBL Accession Nos. AF155806 and AJ422132), and 79 to 81% nucleotide identity was obtained with the East African cassava mosaic Malawi virus (EMBL Accession No. AJ006460). For the 522-bp sequences obtained with the AV494/AC1048 primer set, 95 to 97% nucleotide identity was shown between the three isolates. The most significant sequence alignments were also with begomoviruses; TYLCMV isolate Morondava (EMBL Accession No. AJ422125) with 86 to 88% nucleotide identity, Tomato yellow leaf curl virus isolates (GenBank and EMBL Accession Nos. AF105975, AJ489258, AB014346, AF024715, AF071228, and X76319) with 86 to 87% nucleotide identity, and SACMV isolate M12 (EMBL Accession No. AJ422132) with 85 to 86% nucleotide identity. According to the current taxonomic criteria for the provisional classification of a new begomovirus species, nucleotide sequence identity in the core region of the CP <90% (1), the tomato begomovirus from Mayotte is a new species and is provisionally named Tomato leaf curl Mayotte virus. References: (1) J. K. Brown et al. Arch. Virol. 146:1581, 2001. (2) P. Umaharan et al. Phytopathology 88:1262, 1998. (3) S. D. Wyatt and J. K. Brown. Phytopathology 86:1288, 1996.
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Woolaver, Lance, Rina Nichols, William F. Rakotombololona, Anselme T. Volahy, and Joanna Durbin. "Population status, distribution and conservation needs of the narrow-striped mongoose Mungotictis decemlineata of Madagascar." Oryx 40, no. 1 (January 2006): 67–75. http://dx.doi.org/10.1017/s0030605306000159.

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The narrow-striped mongoose Mungotictis decemlineata is a small, endemic carnivore currently known to occur only in the dry deciduous forests of the central and southern Menabe regions of western Madagascar. It is categorized as Endangered on the IUCN Red List and is threatened by rapid habitat loss from deforestation. From live-trapping and village surveys we found M. decemlineata to be distributed throughout the largest area of connected forest in central Menabe and most of the larger forest fragments in southern Menabe. We estimated there are a minimum of 2,000–3,400 adults in central Menabe and 6,400–8,650 adults in southern Menabe. Although this represents the total known population, the southern limits of the species' range are still unclear. Fifty-four individuals were live-trapped in central Menabe. M. decemlineata abundance was not correlated with forest structure or invertebrate abundance and diversity at the sampled sites. The building of access roads for logging may have a long-lasting effect by increasing the level of human disturbance, predation by domestic dogs, and illegal cutting within the surrounding area. Conservation management efforts to save M. decemlineata need immediate implementation, with emphasis on cooperative efforts with local villages to reduce the rate of slash-and-burn agriculture and logging of the remaining dry deciduous forest of the region. Research to determine population trends and status of M. decemlineata south of the Morondava and Mangoky rivers is required.
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Rabaoarisoa, Chitale Remonja, Rado Rakotoarison, Nivo Heritiana Rakotonirainy, Reziky Tiandraza Mangahasimbola, Alain Berthin Randrianarisoa, Ronan Jambou, Inès Vigan-Womas, Patrice Piola, and Rindra Vatosoa Randremanana. "The importance of public health, poverty reduction programs and women’s empowerment in the reduction of child stunting in rural areas of Moramanga and Morondava, Madagascar." PLOS ONE 12, no. 10 (October 18, 2017): e0186493. http://dx.doi.org/10.1371/journal.pone.0186493.

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22

Bialuschewski, Arne. "Thomas Bowrey's Madagascar Manuscript of 1708." History in Africa 34 (2007): 31–42. http://dx.doi.org/10.1353/hia.2007.0002.

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In 1913 an old chest was discovered in a manor house in Worcestershire in the west of England. Packed with bundles of manuscripts, it contained several hundred letters and business papers written in a crabbed italic hand. These documents belonged to Thomas Bowrey, an English overseas merchant, who was born in 1662 and died in 1713. The collection of papers was later purchased by Colonel Henry Howard, and in 1931 part of it was presented to the Guildhall Library in London. These documents include an incomplete manuscript titled “Discription of the Coast of Affrica from the Cape of Good Hope, to the Red Sea” dated 1708. The notes indicate that Bowrey intended to write a book that encompassed descriptions of all the major ports of the region.Only fragments of the draft survive. Most of the manuscript contains amendments, crossed-out sections, and blank spaces. The text consists of different versions of a preface, brief accounts of the Dutch Cape Colony and Delagoa Bay in Mosambique, as well as a draft portion which has the title “Islands of ye Coast of Africa on ye East Side of ye Cape of Good Hope: Places of Trade on Madagascar.” The densely written and in part hardly legible text is on sixteen folio pages. It gives information about Assada, Old Masselege, Manangara, New Masselege, Terra Delgada, Morondava, Crab Island, St. Vincent, St. Iago, Tulear, St. Augustin Bay, St. John's, Port Dauphin, Matatana, Bonavola, St. Mary's Island, and Antongil Bay. This document also includes descriptions of Mauritius and Bourbon, nowadays called Réunion. Most of these places were visited by English, Dutch, and French seafarers in the last decades of the seventeenth century.
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Remonja, Chitale Rabaoarisoa, Rado Rakotoarison, Nivo Heritiana Rakotonirainy, Reziky Tiandraza Mangahasimbola, Alain Berthin Randrianarisoa, Ronan Jambou, Inès Vigan-Womas, Patrice Piola, and Rindra Vatosoa Randremanana. "Correction: The importance of public health, poverty reduction programs and women's empowerment in the reduction of child stunting in rural areas of Moramanga and Morondava, Madagascar." PLOS ONE 12, no. 12 (December 11, 2017): e0189747. http://dx.doi.org/10.1371/journal.pone.0189747.

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24

Emmel, B., J. Jacobs, and T. Razakamanana. "Titanite and apatite fission track analyses on basement rocks of central-southern Madagascar: constraints on exhumation and denudation rates along the eastern rift shoulder of the Morondava basin." Journal of African Earth Sciences 38, no. 4 (March 2004): 343–61. http://dx.doi.org/10.1016/j.jafrearsci.2003.10.009.

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Adimah, N. I., and S. Padhy. "Ambient noise Rayleigh wave tomography across the Madagascar island." Geophysical Journal International 220, no. 3 (November 29, 2019): 1657–76. http://dx.doi.org/10.1093/gji/ggz542.

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SUMMARY The unusual complex lithospheric structure of Madagascar is a product of a number of important geological events, including: the Pan-African Orogeny, episodes of Late Cenozoic intraplate volcanism and several phases of deformation and metamorphism. Despite this rich history, its detailed crustal structure remains largely underexplored. Here, we take advantage of the recently obtained data set of the RHUM-RUM (Réunion Hotspot and Upper Mantle–Réunions Unterer Mantel) seismological experiment, in addition to previously available data sets to generate the first Rayleigh wave group velocity maps across the entire island at periods between 5 and 30 s using the ambient noise tomography technique. Prior to preliminary data preparation, data from Ocean Bottom Seismometers are cleaned of compliance and tilt noise. Cross-correlating noise records yielded over 1900 Rayleigh wave cross-correlation functions from which group velocities were measured to perform surface wave tomography. Dispersion curves extracted from group velocity tomographic maps are inverted to compute a 3-D shear velocity model of the region. Our velocity maps have shown relative improvement in imaging the three sedimentary basins in the western third of the island compared to those of previous studies. The Morondava basin southwest of the island is the broadest and contains the thickest sedimentary rocks while the Antsirinana basin at the northern tip is narrowest and thinnest. The lithosphere beneath the island is characterized by a heterogeneous crust which appears thickest at the centre but thins away towards the margins. A combined effect of uneven erosion of the crust and rifting accommodates our observations along the east coast. Average 1-D shear velocity models in six different tectonic units, support the causes of low velocity zones observed in the west coast of the island and reveal an intermediate-to-felsic Precambrian upper and middle crust consistent with findings of previous seismic studies. Our findings, especially at short periods provide new constraints on shallow crustal structure of the main island region.
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26

Kennedy, William James. "Sharpeiceras australe sp. nov., replacement name for Sharpeiceras Falloti Kennedy, 2013, non collignon, 1931." Acta Geologica Polonica 64, no. 1 (March 1, 2014): 120–22. http://dx.doi.org/10.2478/agp-2014-0005.

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27

Zavada, Michael S. "The ultrastructure of angiosperm pollen from the Lower Cenomanian of the Morondova Basin, Madagascar." Grana 42, no. 1 (January 2003): 20–32. http://dx.doi.org/10.1080/00173130310008544.

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28

Delatte, Hélène, Darren P. Martin, Florence Naze, Rob Goldbach, Bernard Reynaud, Michel Peterschmitt, and Jean-Michel Lett. "South West Indian Ocean islands tomato begomovirus populations represent a new major monopartite begomovirus group." Journal of General Virology 86, no. 5 (May 1, 2005): 1533–42. http://dx.doi.org/10.1099/vir.0.80805-0.

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Biological and molecular properties of Tomato leaf curl Madagascar virus isolates from Morondova and Toliary (ToLCMGV-[Tol], -[Mor]), Tomato leaf curl Mayotte virus isolates from Dembeni and Kahani (ToLCYTV-[Dem], -[Kah]) and a Tomato yellow leaf curl virus isolate from Réunion (TYLCV-Mld[RE]) were determined. Full-length DNA components of the five isolates from Madagascar, Mayotte and Réunion were cloned and sequenced and, with the exception of ToLCMGV-[Tol], were shown to be both infectious in tomato and transmissible by Bemisia tabaci. Sequence analysis revealed that these viruses had genome organizations of monopartite begomoviruses and that both ToLCMGV and ToLCYTV belong to the African begomoviruses but represent a distinct monophyletic group that we have tentatively named the South West islands of the Indian Ocean (SWIO). All of the SWIO isolates examined were apparently complex recombinants. None of the sequences within the recombinant regions closely resembled that of any known non-SWIO begomovirus, suggesting an isolation of these virus populations.
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29

R, Voajanahary. "Palynostratigraphy of Upper Mesozoic Outcrops near Anjiajia (Mahajanga Basin), and Manamana (Morondava Basin), and It’s Bearing on the Development of Cretaceous Angiosperm Floras in Madagascar." International Journal of Paleobiology & Paleontology 3, no. 1 (2020). http://dx.doi.org/10.23880/ijpbp-16000118.

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The two outcrops were investigated palynologically. One outcrop is approximately a 17meter section near Anjiajia in the Mahajanga Basin and the second outcrop is approximately a 5meter section located in the Manamana massif-South Ankazoabo in the Morondava Basin. The section from Anjiajia was dominated by Cryptogrames (56%), Gymnosperms (29.5%) and a minor component of angiosperms (19%). Based on the sedimentology, composition of the palynoflora, the low percentage of angiosperms, and the occurrence of the dinoflagellate Litosphaeridium arundum at the Anjiajia sample is estimated to be Albian to Cenomanian in age. The section from Manamana is dominated by Cryptogrames (47%), Angiosperm (30.5%) and Gymnosperms (17.5 %). Based on the sedimentology, floral composition, the higher percentage of angiosperms relative to the Anjiajia sample, the occurrence of the Dinoflagellates Leberidocysta chlamydata and Odontochitina operculata and the location of the section beneath the Coniacian basalts in the Morondava basin, these data suggest a Turonian-Coniacian age for this sample. Based on these two Cretaceous palynofloras and a megafossil fossil flora from the Maevarano Formation (Santonian to Maastrichtian), which has only a few species of gymnosperms and is dominated by the Lower Cretaceous angiosperm Sapindopsis, it appears the southern hemisphere floras are lagging behind the northern hemisphere angiosperm floras in diversity and abundance.
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