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27 results for “Orcaella”
Fig. 4 in Population Estimates And Distribution Patterns Of Irrawaddy Dolphins (Orcaella Brevirostris) And Indo-Pacific Finless Porpoises (Neophocaena Phocaenoides) In The Kuching Bay, Sarawak
Fig. 4. Mapping of selected re-sighted Irrawaddy dolphins represented by photographs of the right sides of their dorsal fins in the Kuching Bay area.
Fig. 3 in Population Estimates And Distribution Patterns Of Irrawaddy Dolphins (Orcaella Brevirostris) And Indo-Pacific Finless Porpoises (Neophocaena Phocaenoides) In The Kuching Bay, Sarawak
Fig. 3. Relative densities for Irrawaddy dolphins (a) and finless porpoises (b). Densities are represented as the number of sightings per km searched in 2 × 2 km grid cells. This includes all on-effort sightings and all effort tracks from the start of the project in Jun.2008 through Oct. 2011.
Fig. 2 in Population Estimates And Distribution Patterns Of Irrawaddy Dolphins (Orcaella Brevirostris) And Indo-Pacific Finless Porpoises (Neophocaena Phocaenoides) In The Kuching Bay, Sarawak
Fig. 2. Distribution of on-effort sightings made during 2010–2011 DISTANCE surveys of the Kuching area. Sea conditions and logistical constraints limited survey coverage of the upper Northwestern most corner of the Santubong-Salak block.
Fig. 1 in Population Estimates And Distribution Patterns Of Irrawaddy Dolphins (Orcaella Brevirostris) And Indo-Pacific Finless Porpoises (Neophocaena Phocaenoides) In The Kuching Bay, Sarawak
Fig. 1. Kuching area survey "strata". Shapes for areas were created in Google Earth, creating slight mis-match with the base maps used in ArcGIS.
Fig. 7 in Habitat use and site fidelity of Irrawaddy dolphins (Orcaella brevirostris) in the coastal waters of Bago-Pulupandan, Negros Occidental, Philippines
Fig. 7. Activity Index showing proportion of each behavioural activity (foraging; socialising; traveling; resting) per sector.
Fig. 8 in Habitat use and site fidelity of Irrawaddy dolphins (Orcaella brevirostris) in the coastal waters of Bago-Pulupandan, Negros Occidental, Philippines
Fig. 8. Monthly (N=25) and yearly (N=8) sighting rate (please see Material and Methods) for 19 identified Irrawaddy dolphins from Bago-Pulupandan (includes entire period of the sightings of these identified dolphins).
Fig. 3 in Habitat use and site fidelity of Irrawaddy dolphins (Orcaella brevirostris) in the coastal waters of Bago-Pulupandan, Negros Occidental, Philippines
Fig. 3. Discovery curve of marked individual dolphins in the study area over 25 survey months from 2010 to 2016.
Fig. 1 in Habitat use and site fidelity of Irrawaddy dolphins (Orcaella brevirostris) in the coastal waters of Bago-Pulupandan, Negros Occidental, Philippines
Fig. 1. Coastal waters of Bago City and the Municipality of Pulupandan in Guimaras Strait; Left inset: location of Western Visayas Region in the Philippines; Right inset: Guimaras Strait located between Negros Island and Guimaras Island.
Fig. 4. A in Habitat use and site fidelity of Irrawaddy dolphins (Orcaella brevirostris) in the coastal waters of Bago-Pulupandan, Negros Occidental, Philippines
Fig. 4. A, sightings of Irrawaddy dolphins (in yellow dots) relative to sectors; B, minimum convex polygon (MCP) of all sightings in Bago-Pulupandan coastal waters.
Fig. 4 in Population size, distribution and daylight behaviour of Irrawaddy dolphins (Orcaella brevirostris) in Penang Island, Malaysia
Fig. 4. Distribution of sightings based on behavioural observations recorded in west Penang throughout the period of the study.
Fig. 2 in Population size, distribution and daylight behaviour of Irrawaddy dolphins (Orcaella brevirostris) in Penang Island, Malaysia
Fig. 2. Discovery curve showing the accumulation of new individuals identified during the period of study, related to the effort in hours per month when sighting were recorded. LDF = Left dorsal fin; RDF = Right dorsal fin; OBP = regardless of side.
Fig. 3. A in Population size, distribution and daylight behaviour of Irrawaddy dolphins (Orcaella brevirostris) in Penang Island, Malaysia
Fig. 3. A, individuals with the widest range of distribution during the time of the study; B, distribution of the sightings with the tide level (m) recorded for each sighting.
Fig. 5 in Population size, distribution and daylight behaviour of Irrawaddy dolphins (Orcaella brevirostris) in Penang Island, Malaysia
Fig. 5. The pattern of movement tracked when the Irrawaddy dolphins were feeding. The actual track is that of the boat following the dolphins. Some loops have been tagged as an example of what they look like (see inset). The movement was recorded 400 m from Pantai Kerachut while following a group of dolphins outside the survey path, west Penang.
Fig. 8 in Habitat use and behaviour of the Irrawaddy dolphin, Orcaella brevirostris and the Indo-Pacific finless porpoise, Neophocaena phocaenoides off the west coast of Penang Island, Malaysia
Fig. 8. Mean activity index (AI) of Irrawaddy dolphins and finless porpoises for each quadrat in the west Penang Island study.
Fig. 6 in Habitat use and behaviour of the Irrawaddy dolphin, Orcaella brevirostris and the Indo-Pacific finless porpoise, Neophocaena phocaenoides off the west coast of Penang Island, Malaysia
Fig. 6. Coefficient of Area Use (AU) for both species in west Penang Island. A, AU for the Irrawaddy dolphin, B, AU for the finless porpoise and C, combination and overlap of area use for both Irrawaddy dolphin and finless porpoise
Fig. 2 in Habitat use and behaviour of the Irrawaddy dolphin, Orcaella brevirostris and the Indo-Pacific finless porpoise, Neophocaena phocaenoides off the west coast of Penang Island, Malaysia
Fig. 2. Two survey routes where the research boat travelled, consisting of a parallel line route and a zig–zag route in west Penang
Fig. 3 in Habitat use and behaviour of the Irrawaddy dolphin, Orcaella brevirostris and the Indo-Pacific finless porpoise, Neophocaena phocaenoides off the west coast of Penang Island, Malaysia
Fig. 3. Cetacean encounters in the western coastal waters of Penang Island (February 2019–April 2021) during on-effort surveys. A, Irrawaddy dolphin group size; and B, finless porpoise group size.
Fig. 4 in Habitat use and behaviour of the Irrawaddy dolphin, Orcaella brevirostris and the Indo-Pacific finless porpoise, Neophocaena phocaenoides off the west coast of Penang Island, Malaysia
Fig. 4. Comparison of Irrawaddy dolphin and finless porpoise sightings across distance from the shore (km) and depth of water (m) in west Penang Island, Malaysia.
Data from: Habitat modeling of Irrawaddy dolphins (Orcaella brevirostris) in the eastern Gulf of Thailand
<p><b>Aim: </b>The Irrawaddy dolphin (<i>Orcaella brevirostris</i>) is an endangered cetacean found throughout Southeast Asia. The main threat to this species is human encroachment, led by entanglement in fishing gear. Information on this data-poor species' ecology and habitat use is needed to effectively inform spatial management.</p> <p><b>Location: </b>We investigated the habitat of a previously unstudied group of Irrawaddy dolphins in the eastern Gulf of Thailand, between the villages of Laem Klat and Khlong Yai, in Trat Province. This location is important as government groups plan to establish a marine protected area.</p> <p><b>Methods: </b>We carried out boat-based visual line transect surveys with concurrent oceanographic measurements and used hurdle models to evaluate this species' patterns of habitat use in this area.</p> <p><b>Results: </b>Depth most strongly predicted dolphin presence, while temperature was a strong predictor of group size. The highest probability of dolphin presence occurred at around 10.0 m with an optimal depth range of 7.50 to 13.05 m. The greatest number of dolphins was predicted at 24.93<sup>o</sup>C with an optimal range between 24.93 and 25.31<sup>o</sup>C. Dolphins are most likely to occur in two primary locations, one large region in the center of the study area (11<sup>o</sup>54'18"N to 11<sup>o</sup>59'23"N) and a smaller region in the south (11<sup>o</sup>47'28"N to 11<sup>o</sup>49'59"N). Protections for this population will likely have the greatest chance of success in these two areas.</p> <p><b>Main Conclusions: </b>The results of this work can inform management strategies within the immediate study area by highlighting areas of high habitat use that should be considered for marine spatial planning measures, such as the creation of marine protected areas. Species distribution models for this species in Thailand can also assist conservation planning in other parts of the species' range by expanding our understanding of habitat preferences.</p>
Fig. 6 in Habitat use and site fidelity of Irrawaddy dolphins (Orcaella brevirostris) in the coastal waters of Bago-Pulupandan, Negros Occidental, Philippines
Fig. 6. Strong positive correlation between time spent in each sector with average depth.
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OpenNeuro
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