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2,991 results for “indian ocean”
FIGURE 1 in Hemitrygon yemenensis sp. nov., a new species of stingray (Myliobatoidea Dasyatidae) from the northwestern Indian Ocean
FIGURE 1. Hemitrygon yemenensis sp. nov., adult male holotype (NMW 60783, 223 mm DW, preserved): A. dorsal surface; B. ventral surface.
FIGURE 2 in Hemitrygon yemenensis sp. nov., a new species of stingray (Myliobatoidea Dasyatidae) from the northwestern Indian Ocean
FIGURE 2. Hemitrygon yemenensis sp. nov., female paratype (NMW 99841, 206 mm DW, preserved): A. dorsal surface; B. ventral surface.
FIGURE 5 in Hemitrygon yemenensis sp. nov., a new species of stingray (Myliobatoidea Dasyatidae) from the northwestern Indian Ocean
FIGURE 5. Lateral view of tail near base of Hemitrygon yemenensis sp. nov., (NMW 99841, female paratype, 206 mm DW) with its emergent tail thorns.
FIGURE 3 in Hemitrygon yemenensis sp. nov., a new species of stingray (Myliobatoidea Dasyatidae) from the northwestern Indian Ocean
FIGURE 3. Oronasal region of Hemitrygon yemenensis sp. nov., A. Adult male holotype (NMW 60783, 223 mm DW). B. female paratype (NMW 99841, 206 mm DW).
FIGURE 5 in A new species of Aphantolana Moore & Brusca, 2003 (Crustacea: Isopoda Cirolanidae) from the Andaman Islands, northern Indian Ocean
FIGURE 5. Aphantolana wandoor sp. nov., holotype ♂ (2.4 mm, PUMB 3531). A, pleopod 1; B, pleopod 2; C, pleopod 3; D, pleopod 4; E, pleopod 5.
FIGURE 4 in A new species of Aphantolana Moore & Brusca, 2003 (Crustacea: Isopoda Cirolanidae) from the Andaman Islands, northern Indian Ocean
FIGURE 4. Aphantolana wandoor sp. nov., holotype ♂ (2.4 mm, PUMB 3531). A, pereopod 1; B, pereopod 2; C, pereopod 4; D, pereopod 7.
FIGURE 3 in A new species of Aphantolana Moore & Brusca, 2003 (Crustacea: Isopoda Cirolanidae) from the Andaman Islands, northern Indian Ocean
FIGURE 3. Aphantolana wandoor sp. nov., holotype ♂ (2.4 mm, PUMB 3531). A, pleonites 1–5; B, maxilla; C, maxillule; D, mandible; E, maxilliped.
FIGURE 2 in A new species of Aphantolana Moore & Brusca, 2003 (Crustacea: Isopoda Cirolanidae) from the Andaman Islands, northern Indian Ocean
FIGURE 2. Aphantolana wandoor sp. nov., holotype ♂ (2.4 mm, PUMB 3531). A, dorsal view; B, coxal plates 1–7; C, anten- nula; D, antenna; E, frontal lamina; F, penes; G, pleotelson; H, uropods.
Data from: Kin relationships in cultural species of the marine realm: case study of a matrilineal social group of sperm whales off Mauritius Island, Indian Ocean
<p>Understanding the organization and dynamics of social groups of marine mammals through the study of kin relationships is particularly challenging. Here we studied a stable social group of sperm whales off Mauritius, using underwater observations, individual-specific identification, non-invasive sampling, and genetic analyses based on mitochondrial sequencing and microsatellite profiling. Twenty-four sperm whales were sampled between 2017 and 2019. All individuals except one adult female shared the same mtDNA haplotype—one that is rare in the Western Indian Ocean—thus confirming with near certainty the matrilineality of the group. All probable first- and second-degree kin relationships were depicted in a sperm whale social group: 13 first-degree and 34 second-degree relationships were identified. Notably, we highlight the likely case of an unrelated female having been integrated into a social unit, in that she presented a distinct mtDNA haplotype and no close relationships with any members of the group. Investigating the possible matrilineality of sperm whale cultural units (i.e., vocal clans) is the next step in our research program to elucidate and better apprehend the complex organization of sperm whale social groups.</p>
FIGURE 3 in A new deep-water species of snake eel, Xyrias anjaalai sp. nov. (Anguilliformes Ophichthidae), from the Western Indian Ocean
FIGURE 3. Diagrammatic illustration of head pores of holotype of Xyrias anjaalai sp. nov., CMFRI.DNRNo. GB.4.13.27.1 (SO-supraorbital pores, IO-infraorbital pores, MP- mandibular pores, ST-supratemporal pores, LLlateral- line pores).
FIGURE 2 in A new deep-water species of snake eel, Xyrias anjaalai sp. nov. (Anguilliformes Ophichthidae), from the Western Indian Ocean
FIGURE 2. Radiograph of the holotype of Xyrias anjaalai sp. nov., CMFRI.DNRNo.GB.4.13.27.1, Arrows indicate vertebrae counted: predorsal (19), preanal (74) and total vertebrae (148).
FIGURE 1 in A new deep-water species of snake eel, Xyrias anjaalai sp. nov. (Anguilliformes Ophichthidae), from the Western Indian Ocean
FIGURE 1. Holotype of Xyrias anjaalai sp. nov., CMFRI.DNRNo.GB.4.13.27.1, 640 mm TL, fresh specimen, right side (photo credit: Aju K. Raju)
FIGURE 5 in A new deep-water species of snake eel, Xyrias anjaalai sp. nov. (Anguilliformes Ophichthidae), from the Western Indian Ocean
FIGURE 5. Bayesian inference (BI) tree inferred from the nucleotide sequences of COI sequences of different species belonging to Ophichthinae subfamily.
FIGURE 4 in A new deep-water species of snake eel, Xyrias anjaalai sp. nov. (Anguilliformes Ophichthidae), from the Western Indian Ocean
FIGURE 4. The dentition of upper jaw and lower jaw of the holotype of Xyrias anjaalai sp. nov., CMFRI.DNRNo. GB.4.13.27.1.
FIGURE 2 in A new species of Trimma (Pisces: Gobiidae) from western Thailand, north-eastern Indian Ocean
FIGURE 2. Trimma ukkriti, paratype, 28.9 mm SL, ROM 68095, Ko Hi, Phuket. Left lateral (A) and dorsal (B) views of head to show head papillae, specimen stained with cyanine blue. Papillae rows connected by thin green lines. Photo and image collation by R. Winterbottom.
FIGURE 1 in A new species of Trimma (Pisces: Gobiidae) from western Thailand, north-eastern Indian Ocean
FIGURE 1. Trimma ukkriti, paratypes, Phuket, Thailand. A: 23.1 mm SL female, ROM 68095; B: 24.6 mm SL male, ROM 68094; C: 25.6 mm SL female, ROM 68093. Photos: R. Winterbottom.
FIGURE 4 in A new species of Trimma (Pisces: Gobiidae) from western Thailand, north-eastern Indian Ocean
FIGURE 4. Examples of the fresh/live colouration of members of the Trimma okinawae/readerae complex. A: T. okinawae, Amami Is., KPM-NR 108727, H. Senou; B: T. okinawae, Ie-jima I., Okinawa Is., KPM-NR 48401,T. Nomura; C: T. okinawae, Kerama I., Okinawa Is., KPM-NR 142270, K. Uchino; D: T. readerae, Yonge Reef, Queensland, AMS I.20784-020, D. Hoese; E: T. readerae, Lizard I., Queensland, ROM 38329, R. Winterbottom; F: T. okinawae, Rabaul, New Britain, ROM 92116, R. Winterbottom.
FIGURE 3 in A new species of Trimma (Pisces: Gobiidae) from western Thailand, north-eastern Indian Ocean
FIGURE 3. Trimma ukkriti, paratype, 23.5 mm SL male, ROM 68764, Ko Racha Yai, Phuket. Left lateral view of head and anterior body to show colour pattern of preserved specimens. Photo: R. Winterbottom.
Description and classification of echolocation clicks of Indian Ocean humpback (Sousa plumbea) and Indo-Pacific bottlenose (Tursiops aduncus) dolphins from Menai Bay, Zanzibar, East Africa
<p>Passive acoustic monitoring (PAM) is a powerful method to study the occurrence, movement and behavior of echolocating odontocetes (toothed whales) in the wild. However, in areas occupied by more than one species, echolocation clicks need to be classified into species. The present study investigated whether the echolocation clicks produced by small, at-risk, resident sympatric populations of Indian Ocean humpback dolphin (Sousa plumbea) and Indo-Pacific bottlenose dolphin (Tursiops aduncus) in Menai Bay, Zanzibar, East Africa, could be classified to allow species specific monitoring. Underwater sounds of S. plumbea and T. aduncus groups were recorded using a SoundTrap 202HF in January and June-August 2015. Eight acoustic parameters, i.e. -10 dB duration, peak, centroid, lower -3 and lower -10 dB frequencies, and -3 dB, -10 dB and root-mean-squared bandwidth, were used to describe and compare the two species' echolocation clicks. Statistical analyses showed that S. plumbea clicks had significantly higher peak, centroid, lower -3 and lower -10 dB frequencies compared to T. aduncus, whereas duration and bandwidth parameters were similar for the two species. Random Forest (RF) classifiers were applied to determine parameters that could be used to classify the two species from echolocation clicks and achieved 28.6% and 90.2% correct species classification rates for S. plumbea and T. aduncus, respectively. <a name="_Hlk32088545">Both species were classified at a higher rate than expected at random, however the identified classifiers would only be useful for T. aduncus monitoring.</a> <a name="_Hlk32088580">The frequency and bandwidth parameters provided most power for species classification.</a> <a name="_Hlk32088592">Further study is necessary to identify useful classifiers for S. plumbea.</a> This study represents a first step in acoustic <a name="_Hlk32088605">description </a>and classification of S. plumbea and T. aduncus in the western Indian Ocean region, with potential application for future acoustic monitoring of species-specific temporal and spatial occurrence in these sympatric species.</p>
Data from: Population genetic structure and connectivity of the seagrass Thalassia hemprichii in the Western Indian Ocean is influenced by predominant ocean currents
This study is the first large-scale genetic population study of a widespread climax species of seagrass, Thalassia hemprichii, in the Western Indian Ocean (WIO). The aim was to understand genetic population structure and connectivity of T. hemprichii in relation to hydrodynamic features. We genotyped 205 individual seagrass shoots from 11 sites across the WIO, spanning over a distance of ~2,700 km, with twelve microsatellite markers. We assessed clonality and visualized genetic diversity and genetic population differentiation. We used Bayesian clustering approaches (TESS) to trace spatial ancestry of populations and used directional migration rates (DivMigrate) to identify sources of gene flow. We identified four genetically differentiated groups; (1) samples from the Zanzibar channel, (2) Mozambique, (3) Madagascar, and (4) the east coast of Zanzibar and Kenya. Significant pairwise population genetic differentiation was found among many sites. Isolation by distance was detected for the estimated magnitude of divergence (DEST), but the three predominant ocean current systems (i.e. East African Coastal Current, North East Madagascar Current and the South Equatorial Current) also determine genetic connectivity and genetic structure. Directional migration rates indicate that Madagascar acts as an important source population. Overall clonality was moderate to high with large differences among sampling sites, indicating relatively low, but spatially variable sexual reproduction rates. The strongest genetic break was identified for three sites in the Zanzibar channel. Although isolation by distance is present, this study suggests that the three regionally predominant ocean current systems (i.e. East African Coastal Current, North East Madagascar Current and the South Equatorial Current) rather than distance determine genetic connectivity and structure of T. hemprichii in the WIO. If the goal is to maintain genetic connectivity of T. hemprichii within the WIO, conservation planning and implementation of marine protection should be considered at the regional scale – across national boarders.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.