scholarly journals Eastward from Africa: palaeocurrent-mediated chameleon dispersal to the Seychelles islands

2010 ◽  
Vol 7 (2) ◽  
pp. 225-228 ◽  
Author(s):  
Ted M. Townsend ◽  
Krystal A. Tolley ◽  
Frank Glaw ◽  
Wolfgang Böhme ◽  
Miguel Vences
Keyword(s):  
Indian Ocean ◽  
Late Cretaceous ◽  
Sister Taxon ◽  
Phylogenetic Study ◽  
Endemic Genus ◽  
Divergence Dating ◽  
Seychelles Islands ◽  
The Indian Ocean ◽  
Transoceanic Dispersal ◽  
African Clade

Madagascar and the Seychelles are Gondwanan remnants currently isolated in the Indian Ocean. In the Late Cretaceous, these islands were joined with India to form the Indigascar landmass, which itself then split into its three component parts around the start of the Tertiary. This history is reflected in the biota of the Seychelles, which appears to contain examples of both vicariance- and dispersal-mediated divergence from Malagasy or Indian sister taxa. One lineage for which this has been assumed but never thoroughly tested is the Seychellean tiger chameleon, a species assigned to the otherwise Madagascar-endemic genus Calumma . We present a multi-locus phylogenetic study of chameleons, and find that the Seychellean species is actually the sister taxon of a southern African clade and requires accomodation in its own genus as Archaius tigris . Divergence dating and biogeographic analyses indicate an origin by transoceanic dispersal from Africa to the Seychelles in the Eocene–Oligocene, providing, to our knowledge, the first such well-documented example and supporting novel palaeocurrent reconstructions.

The crucial boundaries in the development of the late cretaceous biota of plankton foraminifers in the southern part of the Indian ocean

2019 ◽  
Vol 59 (6) ◽  
pp. 1074-1085
Author(s):  
E. A. Sokolova
Keyword(s):  
Indian Ocean ◽  
Species Composition ◽  
Late Cretaceous ◽  
Upper Cretaceous ◽  
Planktonic Foraminifera ◽  
The Indian Ocean ◽  
Systematic Composition ◽  
Climatic Series

The article analyzes own data on the species composition of shells of planktonic foraminifera from the Upper Cretaceous sediments of the Indian Oceans, as well as from the sections of the offshore seas of Australia. The species of planktonic foraminifera are grouped and arranged in a climatic series. An analysis of the change in the systematic composition of foraminifers made it possible to distinguish periods of extreme and intermediate climatic states in the Late Cretaceous.

scholarly journals A review of the Eviota zebrina complex, with descriptions of four new species (Teleostei, Gobiidae)

ZooKeys ◽  
2021 ◽  
Vol 1057 ◽  
pp. 149-184
Author(s):  
Luke Tornabene ◽  
David W. Greenfield ◽  
Mark V. Erdmann
Keyword(s):  
Indian Ocean ◽  
Red Sea ◽  
Solomon Islands ◽  
New Guinea ◽  
Gulf Of Aqaba ◽  
Caudal Fin ◽  
The Past ◽  
West Papua ◽  
Seychelles Islands ◽  
The Indian Ocean

The Eviota zebrina complex includes eight species of closely-related dwarfgobies, four of which are herein described as new. The complex is named for Eviota zebrina Lachner & Karnella, 1978, an Indian Ocean species with the holotype from the Seychelles Islands and also known from the Maldives, which was once thought to range into the Gulf of Aqaba and the Red Sea eastward to the Great Barrier Reef of Australia. Our analysis supports the recognition of four genetically distinct, geographically non-overlapping, species within what was previously called E. zebrina, with E. zebrina being restricted to the Indian Ocean, E. marerubrumsp. nov. described from the Red Sea, E. longirostrissp. nov. described from western New Guinea, and E. pseudozebrinasp. nov. described from Fiji. The caudal fin of all four of these species is crossed by oblique black bars in preservative, but these black bars are absent from the four other species included in the complex. Two of the other species within the complex, E. tetha and E. gunawanae are morphologically similar to each other in having the AITO cephalic-sensory pore positioned far forward and opening anteriorly. Eviota tetha is known from lagoonal environments in Cenderawasih Bay and Raja Ampat, West Papua, and E. gunawanae is known only from deeper reefs (35–60 m) from Fakfak Regency, West Papua. The final two species are E. cometa which is known from Fiji and Tonga and possesses red bars crossing the caudal fin (but lost in preservative) and a 9/8 dorsal/anal-fin formula, and E. oculineatasp. nov., which is described as new from New Guinea and the Solomon Islands, and possesses an 8/7 dorsal/anal-fin formula and lacks red caudal bars. Eviota oculineata has been confused with E. cometa in the past.

The Australian Paratrichapus Scott (Coleoptera: Ciidae)

2019 ◽  
Vol 50 (5) ◽  
pp. 679-701
Author(s):  
Igor Souza-Gonçalves ◽  
Cristiano Lopes-Andrade ◽  
Vivian Eliana Sandoval-Gómez ◽  
John Francis Lawrence
Keyword(s):  
New Zealand ◽  
Indian Ocean ◽  
Geographic Distribution ◽  
Identification Key ◽  
Australian Species ◽  
Seychelles Islands ◽  
The Indian Ocean

The genus Paratrichapus Scott, 1926 currently comprises four species, one described from the Seychelles Islands in the Indian Ocean, one from Indonesia and two from New Zealand. Here, the first Australian species of Paratrichapus are described, as follows: P. australis sp. n., P. burwelli sp. n., P. christmasensis sp. n., P. metallonotum sp. n. and P. peckorum sp. n. Data on their geographic distribution and host fungi are provided, as well as an identification key.

scholarly journals Tracking epidemic Chikungunya virus into the Indian Ocean from East Africa

2008 ◽  
Vol 89 (11) ◽  
pp. 2754-2760 ◽  
Author(s):  
M. Kariuki Njenga ◽  
L. Nderitu ◽  
J. P. Ledermann ◽  
A. Ndirangu ◽  
C. H. Logue ◽  
...  
Keyword(s):  
Indian Ocean ◽  
East Africa ◽  
Chikungunya Virus ◽  
Mosquito Vectors ◽  
East African ◽  
Genetic Elements ◽  
Coastal Kenya ◽  
New Variant ◽  
The Indian Ocean ◽  
African Clade

The largest documented outbreak of Chikungunya virus (CHIKV) disease occurred in the Indian Ocean islands and India during 2004–2007. The magnitude of this outbreak led to speculation that a new variant of the virus had emerged that was either more virulent or more easily transmitted by mosquito vectors. To study this assertion, it is important to know the origin of the virus and how the particular strain circulating during the outbreak is related to other known strains. This study genetically characterized isolates of CHIKV obtained from Mombasa and Lamu Island, Kenya, during 2004, as well as strains from the 2005 outbreak recorded in Comoros. The results of these analyses demonstrated that the virus responsible for the epidemic that spread through the Indian Ocean originated in coastal Kenya during 2004 and that the closest known ancestors are members of the Central/East African clade. Genetic elements that may be responsible for the scope of the outbreak were also identified.

Far-Field Effects of Large Tsunamis Produced by the Makran Subduction Zone

2009 ◽  
Author(s):  
Mohammad Heidarzadeh
Keyword(s):  
Numerical Modeling ◽  
Indian Ocean ◽  
Subduction Zone ◽  
Indian Ocean Tsunami ◽  
Far Field ◽  
Historical Records ◽  
Makran Subduction Zone ◽  
Field Effects ◽  
Seychelles Islands ◽  
The Indian Ocean

The 2004 Indian Ocean tsunami which exported death and destruction to far distant shores, once more emphasized the tsunami hazards associated with transoceanic tsunamis. Historical records of tsunamis in the Makran subduction zone (MSZ) reveal that Makran tsunamis are capable of producing large waves in the far-field. The Makran tsunami of 1945 produced by an Mw8.1 earthquake was reported to cause far-field effects in the Indian Ocean and reached a height of about 30 cm in the Seychelles, at the distance of about 3500 km from the MSZ. Here, we assess historical observations of this event and perform numerical modeling of this tsunami with emphasis on its far-field effects. Our numerical modeling successfully reproduces most feathers of the historical observations including its far-field effects. Southward propagation of Makran large tsunamis is investigated and their possible effects on Maldives and Seychelles islands are discussed. This study will help to better understand tsunami hazard associated with the MSZ, especially its far-field hazard.

Sign in / Sign up

Export Citation Format

Share Document