Stranding and mortality of pelagic crustaceans in the western Indian Ocean

2015 ◽  
Vol 95 (8) ◽  
pp. 1677-1684 ◽  
Author(s):  
Evgeny V. Romanov ◽  
Michel Potier ◽  
R. Charles Anderson ◽  
Jean Pascal Quod ◽  
Frédéric Ménard ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Equatorial Indian Ocean ◽  
Western Indian Ocean ◽  
Sudden Increase ◽  
Catastrophic Event ◽  
Crustacean Species ◽  
Mantis Shrimp ◽  
Central Indian Ocean ◽  
First Time ◽  
Mass Stranding

Recent observations of unusual mass stranding and mortality of two Indian Ocean crustacean species, the swimming crabCharybdis smithiiand the mantis shrimpNatosquilla investigatoris, are documented and analysed. Strandings ofC. smithiiwere observed for the first time in the equatorial Indian Ocean, the main area of its pelagic distribution. Strandings of mantis shrimps are reported from throughout the western Indian Ocean; occurrences of mass stranding in the Maldives Archipelago mark an extension of the known range ofN. investigatorisinto the central Indian Ocean. Mortality of crabs probably represents a ‘catastrophic event’. In contrast, mantis shrimp strandings, which were always associated with a sudden increase of its biomass (‘blooms’), are apparently post-reproduction mortalities indicating potential semelparity for this species.

scholarly journals A Central Indian Ocean Mode and Heavy Precipitation during the Indian Summer Monsoon

2017 ◽  
Vol 30 (6) ◽  
pp. 2055-2067 ◽  
Author(s):  
Lei Zhou ◽  
Raghu Murtugudde ◽  
Dake Chen ◽  
Youmin Tang
Keyword(s):  
Indian Ocean ◽  
Summer Monsoon ◽  
Indian Summer Monsoon ◽  
Critical Role ◽  
Western Indian Ocean ◽  
Heavy Precipitation ◽  
Central Indian Ocean ◽  
Monsoonal Precipitation ◽  
Monsoon System ◽  
The Indian Ocean

A central Indian Ocean (CIO) mode is found to play a critical role in driving the heavy precipitation during the Indian summer monsoon (ISM). It is typically denoted with a combination of intraseasonal sea surface temperature (SST) anomalies and intraseasonal wind anomalies over the central Indian Ocean, and it preserves the mechanistic links among various dynamic and thermodynamic fields. Like a T junction, it controls the propagation direction of the intraseasonal variabilities (ISVs) originating in the western Indian Ocean. During the ISM, the CIO mode creates an environment favorable for the northward-propagating mesoscale variabilities. These results unveil the relation between the subseasonal monsoonal precipitation and the CIO mode in the ocean–atmosphere system in the Indian Ocean. The identification of the CIO mode deepens our understanding of the coupled monsoon system and brightens the prospects for better simulation and prediction of monsoonal precipitation in the affected countries.

First occurrence of the moray eel Gymnothorax prolatus Sasaki & Amaoka, 1991 (Teleostei: Anguilliformes: Muraenidae) from the northern Indian Ocean

2015 ◽  
Vol 8 ◽  
Author(s):  
Anil Mohapatra ◽  
Dipanjan Ray ◽  
David G. Smith
Keyword(s):  
Indian Ocean ◽  
Arabian Sea ◽  
Western Indian Ocean ◽  
Northern Indian Ocean ◽  
The North ◽  
First Occurrence ◽  
The Indian Ocean ◽  
First Time ◽  
North Western ◽  
Moray Eel

Gymnothorax prolatusis recorded for the first time from the Indian Ocean on the basis of four specimens collected in the Bay of Bengal off India and one from the Arabian Sea off Pakistan. These records extend the range of the species from Taiwan to the north-western Indian Ocean.

scholarly journals Observation of Quasi-2-Day Convective Disturbances in the Equatorial Indian Ocean during DYNAMO

2018 ◽  
Vol 75 (9) ◽  
pp. 2867-2888 ◽  
Author(s):  
Hungjui Yu ◽  
Richard H. Johnson ◽  
Paul E. Ciesielski ◽  
Hung-Chi Kuo
Keyword(s):  
Indian Ocean ◽  
System Development ◽  
Equatorial Indian Ocean ◽  
Mesoscale Convective System ◽  
Radar Data ◽  
Distinct Pattern ◽  
Convective System ◽  
Zonal Scale ◽  
Central Indian Ocean ◽  
Mesoscale Convective

Abstract This study examines the westward-propagating convective disturbances with quasi-2-day intervals of occurrence identified over Gan Island in the central Indian Ocean from mid- to late October 2011 during the Dynamics of the Madden–Julian Oscillation (DYNAMO) field campaign. Atmospheric sounding, satellite, and radar data are used to develop a composite of seven such disturbances. Composites and spectral analyses reveal that 1) the quasi-2-day convective events comprise westward-propagating diurnal convective disturbances with phase speeds of 10–12 m s−1 whose amplitudes are modulated on a quasi-2-day time scale on a zonal scale of ~1000 km near the longitudes of Gan; 2) the cloud life cycle of quasi-2-day convective disturbances shows a distinct pattern of tropical cloud population evolution—from shallow to deep to stratiform convection; 3) the time scales of mesoscale convective system development and boundary layer modulation play essential roles in determining the periodicity of the quasi-2-day convective events; and 4) in some of the quasi-2-day events there is evidence of counterpropagating (westward and eastward) cloud systems along the lines proposed by Yamada et al. Based on these findings, an interpretation is proposed for the mechanisms for the quasi-2-day disturbances observed during DYNAMO that combines concepts from prior studies of this phenomenon over the western Pacific and Indian Oceans.

The Mosquitos (Diptera: Culicidae) of the Seychelles

1955 ◽  
Vol 46 (1) ◽  
pp. 69-110 ◽  
Author(s):  
P. F. Mattingly ◽  
E. S. Brown
Keyword(s):  
Indian Ocean ◽  
New Records ◽  
Western Indian Ocean ◽  
Local Distribution ◽  
First Time

A list is given of all the species of mosquitos so far recorded from the Seychelles, with their distribution in so far as this is known. A number of new records are included based on collections made recently by one of us (E.S.B.).One species and one subspecies new to science are here described for the first time. The first full descriptions of the male terminalia and pupae of certain other species are included.Some notes are given regarding the taxonomy, bionomics and local distribution of the species concerned and the zoogeography of the groups to which they belong.Appendices are devoted to corrections to the second edition of “The Mosquitoes of the Ethiopian Eegion”, Vol. I by G. H. E. Hopkins, and to the mosquitos of other islands in the western Indian Ocean.

A review of the gobiid fish genus Trimma from the Chagos Archipelago, central Indian Ocean, with the description of seven new species

1984 ◽  
Vol 62 (4) ◽  
pp. 695-715 ◽  
Author(s):  
Richard Winterbottom
Keyword(s):  
New Species ◽  
Indian Ocean ◽  
Western Indian Ocean ◽  
Western Pacific ◽  
Valid Species ◽  
Gobiid Fish ◽  
Central Indian Ocean ◽  
The Pacific ◽  
Chagos Archipelago ◽  
The Western Pacific

The genus Trimma contains 17 nominal and 13 valid species. Five of these are here reported from the Chagos Archipelago: T. eviotops, T. macrophthalma, T. mendelssohni. T. nauclei, and T. taylori. An additional 7 species arc described as new and another is described but not named, for a total of 13 species known from these islands. The biogeographic affinities of Chagos species of Trimma appear to lie with the western Indian Ocean rather than the western Pacific, but the evidence is weak because of the lack of knowledge of the Pacific Trimma fauna.

Redescription of Ichthyoxenus puhi (Bowman, 1962) (Isopoda, Cymothoidae), parasite of the moray eel Gymnothorax griseus (Lacépède, 1803) from Mauritius

Crustaceana ◽  
2014 ◽  
Vol 87 (6) ◽  
pp. 654-665 ◽  
Author(s):  
M. B. Martin ◽  
M. B. Martin ◽  
N. L. Bruce ◽  
M. B. Martin ◽  
N. L. Bruce ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Western Indian Ocean ◽  
Shaped Body ◽  
First Time ◽  
Moray Eel

Ichthyoxenus puhi (Bowman, 1962) is reported for the first time from Mauritius on the host Gymnothorax griseus (Lacépède, 1803), expanding its distribution from Hawaii to the western Indian Ocean. I. puhi is characterized by its oval-shaped body, well-developed posterior lobes on the pereonites, lateral ends of pleonites longer than pereonite 7, pleotelson wider than long, pereopod 4 to 7 with a protruding merus, and a distinct lobe on the proximolateral surface of the basis.

scholarly journals Deglacial intermediate water reorganization: new evidence from the Indian Ocean

2014 ◽  
Vol 10 (1) ◽  
pp. 293-303 ◽  
Author(s):  
S. Romahn ◽  
A. Mackensen ◽  
J. Groeneveld ◽  
J. Pätzold
Keyword(s):  
Indian Ocean ◽  
Southern Ocean ◽  
Ocean Circulation ◽  
Equatorial Indian Ocean ◽  
Western Indian Ocean ◽  
Intermediate Water ◽  
Mode Water ◽  
Climate Anomalies ◽  
Tunnel Mechanism ◽  
Intermediate Waters

Abstract. The importance of intermediate water masses in climate change and ocean circulation has been emphasized recently. In particular, Southern Ocean Intermediate Waters (SOIW), such as Antarctic Intermediate Water and Subantarctic Mode Water, are thought to have acted as active interhemispheric transmitter of climate anomalies. Here we reconstruct changes in SOIW signature and spatial and temporal evolution based on a 40 kyr time series of oxygen and carbon isotopes as well as planktic Mg/Ca based thermometry from Site GeoB12615-4 in the western Indian Ocean. Our data suggest that SOIW transmitted Antarctic temperature trends to the equatorial Indian Ocean via the "oceanic tunnel" mechanism. Moreover, our results reveal that deglacial SOIW carried a signature of aged Southern Ocean deep water. We find no evidence of increased formation of intermediate waters during the deglaciation.

scholarly journals Eleven new species of Amblypsilopus Bigot (Diptera: Dolichopodidae: Sciapodinae) and a key to the species of Madagascar and adjacent islands

2021 ◽  
Vol 755 ◽  
Author(s):  
Igor Ya. Grichanov
Keyword(s):  
New Species ◽  
Indian Ocean ◽  
Western Indian Ocean ◽  
Identification Key ◽  
Secondary Sexual Characters ◽  
Afrotropical Region ◽  
First Time ◽  
Secondary Sexual

Eleven new species of Amblypsilopus Bigot, 1888 from Madagascar are described and illustrated: A. analamazaotra sp. nov., A. andasibensis sp. nov., A. ankarana sp. nov., A. bairae sp. nov., A. fianarantsoa sp. nov., A. freidbergi sp. nov., A. friedmani sp. nov., A. leonidi sp. nov., A. marinae sp. nov., A. olgae sp. nov., and A. romani sp. nov. New species differ from other representatives of the genus in morphology of male surstylus and cercus mainly and male secondary sexual characters on legs. A. flavus (Vanschuytbroeck, 1962) is redescribed. Presently, ca 60 species of Amblypsilopus are known from the Afrotropical region, and 25 species are found on Madagascar. Western Indian Ocean species are associated with the Indo-Pacific A. pallidicornis group, the Pantropical A. abruptus group and the Madagascan A. stuckenbergi group of species. An identification key to males of 28 species of Madagascar and adjacent islands is compiled for the first time.

scholarly journals The species of Moloha Barnard, 1946, from the western Indian Ocean, with the description of a new species from India (Crustacea: Brachyura: Homolidae)

2015 ◽  
Author(s):  
Peter K.L. Ng ◽  
Appukuttannair Biju Kumar
Keyword(s):  
South Africa ◽  
New Species ◽  
Indian Ocean ◽  
Deep Water ◽  
Western Indian Ocean ◽  
Southern India ◽  
First Time ◽  
A New Species

The taxonomy of the deep-water homolid crabs Moloha grandperrini Guinot & Richer de Forges, 1995 and M. alisae Guinot & Richer de Forges, 1995 is re-examined, and the types redescribed and figured. Moloha alisae is reported from South Africa for the first time. A new species with an inflated carapace, M. tumida sp. nov., is also described from southern India and compared with its closest congeners.

scholarly journals Four new species of Acalypha L. (Euphorbiaceae, Acalyphoideae) from the West Indian Ocean Region

PhytoKeys ◽  
2020 ◽  
Vol 140 ◽  
pp. 57-73
Author(s):  
Iris Montero-Muñoz ◽  
Geoffrey A. Levin ◽  
José M. Cardiel
Keyword(s):  
New Species ◽  
Indian Ocean ◽  
Western Indian Ocean ◽  
Molecular Evidence ◽  
Indian Ocean Region ◽  
The West ◽  
Ocean Region ◽  
West Indian Ocean ◽  
Conservation Assessments ◽  
First Time

Four new species of Acalypha (Euphorbiaceae, Acalyphoideae) from the Western Indian Ocean Region, based on morphological and molecular evidence, are described, illustrated, and mapped. Acalypha gillespieae sp. nov., A. leandrii sp. nov. and A. nusbaumeri sp. nov. are endemic to Madagascar, and A. mayottensis sp. nov. is known only from Mbouzi islet (Mayotte), in the Comoros Archipelago. We also describe for the first time in Acalypha the presence of membranous or chartaceous perules covering the axillary buds. Preliminary conservation assessments of the new species are also provided.

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