https://doi.org/10.82144/7ee03437 https://seamap.env.duke.edu/dataset/848 https://www.gbif.org/dataset/b5234065-c150-4184-aa2a-2fd94b843e59 https://obis.org/dataset/f4419d9d-e052-412b-b3ca-ff77487ee349 Gill Braulik WWF-Pakistan Primary contact gillbraulik@downstream.vg OBIS-SEAMAP Marine Geospatial Ecology Lab, Duke University

A328 LSRC building Durham NC 27708 US

seamap-contact@duke.edu https://seamap.env.duke.edu OBIS-SEAMAP Marine Geospatial Ecology Lab, Duke University

A328 LSRC building Durham NC 27708 US

seamap-contact@duke.edu https://seamap.env.duke.edu distributor Gill Braulik WWF-Pakistan Primary contact gillbraulik@downstream.vg owner 2025-07-31 eng Original provider: Gill Braulik, WWF-Pakistan Dataset credits: Gill Braulik, WWF-Pakistan Abstract: A survey was conducted in March and April 2001, to assess the status of the Indus River dolphin, <i>Platanista gangetica minor</i>, throughout its present range. A total of 1535 km of survey effort was conducted, consisting of 1375 km of the Indus River main channel, 136 km of Indus River secondary channels, and 24 km of the Panjnad River, a tributary of the Indus. The effective range of the Indus dolphin has declined by 80% since 1870. The sum of best group size estimates produced an abundance estimate of 965 dolphins. Extrapolation of encounter rates to unsurveyed channels and application of a correction factor to account for missed dolphins indicates that the metapopulation may number approximately 1,200 individuals. Dolphins occur in five subpopulations separated by irrigation barrages. A pronounced increase in dolphin abundance and encounter rate was observed in each subsequent downstream subpopulation (except the last). The three largest subpopulations were between Chashma and Taunsa. Barrages (84 dolphins; 0.28/km), Taunsa and Guddu Barrages (259 dolphins; 0.74/km) and Guddu and Sukkur Barrages (602 dolphins; 3.60/km). Reasons suggested for the high encounter rate between Guddu and Sukkur Barrages, include high carrying capacity, low levels of anthropogenic threat, effective conservation, and augmentation of the subpopulation by downstream migration of dolphins from upstream. Occurrence GBIF Dataset Type Vocabulary: http://rs.gbif.org/vocabulary/gbif/dataset_type.xml Observation GBIF Dataset Subtype Vocabulary: http://rs.gbif.org/vocabulary/gbif/dataset_subtype.xml Marine Biology Visual sighting Vessels Sightings Freshwater dolphins Platanista Distribution Abundance Vessel N/A Data contains information on both the detection location, which is the location of the boat when a dolphin was sighted, and also an exact location, which was the position of the boat when the dolphins were perpendicular. Exact locations were plotted but detection location was used if an exact location was not available. BHL are best, high, low estimates of group size. Best estimates were used for the observed count. Actual survey tracks followed the winding pattern of the Indus River. Tracks presented here are very approximate straight-line visual representations of the actual track. These visually indicate which river sections were surveyed but should not be used for any analysis. This work is licensed under a Creative Commons Attribution Non Commercial (CC-BY-NC) 4.0 License. https://seamap.env.duke.edu/dataset/848 Oceans,Pakistan,Indus River 68.198267 71.412383 32.781017 25.5102 2001-03-13 2001-04-27 Scientific names are based on the Integrated Taxonomic Information System (ITIS). species Platanista minor Indus river dolphin Status Assessment notPlanned Gill Braulik WWF-Pakistan Primary contact gillbraulik@downstream.vg NA NA NA Gill Braulik owner NA zd_848 2025-07-31T15:49:56-04:00 dataset Braulik, G. 2012. WWF survey of the entire range of the Indus River dolphin - 2001. Version 1.0.0. Dataset published in OBIS-SEAMAP. https://doi.org/10.82144/7ee03437. OBIS-SEAMAP Dataset Page UTF-8 Interactive map https://seamap.env.duke.edu/dataset/848 FGDC Metadata UTF-8 XML https://seamap.env.duke.edu/dataset/848/fgdc EML Metadata UTF-8 XML https://seamap.env.duke.edu/dataset/848/eml OBIS-SEAMAP zd_848 zd_848 Braulik, G.T. 2006. Status assessment of the Indus River dolphin, Platanista gangetica minor, March-April 2001. Biological Conservation: 129:579-590.