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Journal articles on the topic 'The River Dolphin'

Author: Grafiati

Published: 4 June 2021

Last updated: 17 February 2022

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1

Page, Charlotte E., and Natalie Cooper. "Morphological convergence in ‘river dolphin’ skulls." PeerJ 5 (November 21, 2017): e4090. http://dx.doi.org/10.7717/peerj.4090.

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Convergent evolution can provide insights into the predictability of, and constraints on, the evolution of biodiversity. One striking example of convergence is seen in the ‘river dolphins’. The four dolphin genera that make up the ‘river dolphins’ (Inia geoffrensis, Pontoporia blainvillei, Platanista gangetica and Lipotes vexillifer) do not represent a single monophyletic group, despite being very similar in morphology. This has led many to using the ‘river dolphins’ as an example of convergent evolution. We investigate whether the skulls of the four ‘river dolphin’ genera are convergent when

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2

Oliveira-da-Costa, Marcelo, Miriam Marmontel, Daiane S. X. da-Rosa, et al. "Effectiveness of unmanned aerial vehicles to detect Amazon dolphins." Oryx 54, no. 5 (2019): 696–98. http://dx.doi.org/10.1017/s0030605319000279.

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AbstractQuantifying the abundance of species is essential for their management and conservation. Much effort has been invested in surveys of freshwater dolphins in the Amazon basin but river dimensions and complex logistics limit replication of such studies across the region. We evaluated the effectiveness of using unmanned aerial vehicles (UAVs) for surveying two Amazon dolphin species, the tucuxi Sotalia fluviatilis and pink river dolphin Inia geoffrensis, in tropical rivers. In 2016 we conducted drone and visual surveys over 80 km of the Juruá River in Brazil. The aerial surveys provided hi

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3

E. Punt, André. "A note regarding conditioning simulation trials for data-poor management strategy evaluations." IWC Journal of Cetacean Research and Management 20, no. 1 (2019): 81–92. http://dx.doi.org/10.47536/jcrm.v20i1.239.

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A boat-based survey was conducted in the Tefé river and lake (Brazil) in December 2013, during the transitional water period. A combination ofstrip-width transects parallel to the river, lake-margins and confluences, and cross-channel line transects in the lake, were used to cover a totaldistance of 670 linear kilometres of the dolphins’ habitat. A total of 383 groups of Amazon river dolphin and 124 groups of tucuxi were observed.Group size, density and abundance estimates were obtained per species and habitat (tributary, lake-margin and confluence). Group sizes rangedfrom one to six individua

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4

Alam, Shayer Mahmood Ibney, Md Muzammel Hossain, Mohammad Abdul Baki, and Naser Ahmed Bhouiyan. "Status of ganges dolphin, Platanista gangetica gangetica (Roxburgh, 1801) in the river Buriganga, Dhaka." Bangladesh Journal of Zoology 43, no. 1 (2015): 109–20. http://dx.doi.org/10.3329/bjz.v43i1.26143.

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Population abundance and density of the Ganges River Dolphin Platanista gangetica gangetica (Roxburgh, 1801) was studied in the Buriganga River from December 2012 to November 2013.The survey was conducted twice a month. The dolphins were counted directly and applied in transect length of 10.5 km within 15 km stretches of the river. A total of 34 sightings of dolphins were recorded both in individuals and groups. We encountered the dolphins at the rate of 0.48 dolphins per km in the Buriganga River. Highest best-high-low estimate of 12-14-10 individuals were recorded in November 2013. The mean

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5

Baird, Ian G., and Isabel L. Beasley. "Irrawaddy dolphin Orcaella brevirostris in the Cambodian Mekong River: an initial survey." Oryx 39, no. 3 (2005): 301–10. http://dx.doi.org/10.1017/s003060530500089x.

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Irrawaddy dolphins Orcaella brevirostiris are found in coastal waters from the Bay of Bengal east to Palawan, Philippines and south to northern Australia. They also occur in three large tropical river systems in South-east Asia: the Mekong, Mahakam and Ayeyarwady. In March and May 1997 approximately 350 km of riverine habitat in parts of north-east Cambodia were surveyed, discussions took place with local people, and reported dry season dolphin habitat was mapped. Our objectives were to investigate the status, habitat and distribution of dolphins in north-east Cambodia and identify threats to

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6

Aryal, M., T. K. Shrestha, and R. P. Sapkota. "Status, distribution and local initiatives taken to conserve river dolphin, Platanista gangetica at Prakashpur-Koshi Barrage section of Koshi River." Nepal Journal of Environmental Science 1 (December 9, 2013): 8–16. http://dx.doi.org/10.3126/njes.v1i1.36542.

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The Gangetic River Dolphin Platanista gangetica is an endangered species and this species has also been included under Appendix I of CITES. This study was based on direct count method by raft survey and multiplatform survey. In addition, questionnaire survey was also conducted with locals and fishermen of the study area to know their perceptions on dolphin. The water quality of the sites, where dolphin were seen, was analyzed using standard methods. Two dolphins were observed in the upper section of the Koshi Barrage and this is a very low number that could extinct in very future if no conserv

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7

Aliaga- Rossel, Enzo, and Mariana Escobar-ww. "Translocation of trapped Bolivian river dolphins (Inia boliviensis)." IWC Journal of Cetacean Research and Management 21, no. 1 (2020): 17–23. http://dx.doi.org/10.47536/jcrm.v21i1.96.

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The Bolivian river dolphin (Inia boliviensis), locally known as bufeo is an endemic species and categorized as Vulnerable in the Red Book of Vertebrates of Bolivia. Despite the fact that the Bolivian river dolphin is the only cetacean in land-locked Bolivia, knowledge about its conservation status and vulnerability to anthropogenic actions is extremely deficient. We report on the rescue and translocation of Bolivian river dolphins trapped in a shrinking segment of the Pailas River, Santa Cruz, Bolivia. Anthropogenic activities to alter the landscape and create agricultural land in the area inc

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8

Fury, Christine A., and Peter L. Harrison. "Abundance, site fidelity and range patterns of Indo-Pacific bottlenose dolphins (Tursiops aduncus) in two Australian subtropical estuaries." Marine and Freshwater Research 59, no. 11 (2008): 1015. http://dx.doi.org/10.1071/mf08109.

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Bottlenose dolphins are widely studied in marine habitats, but information on estuarine populations is very limited. The present study provides the first published data on bottlenose dolphins in Australian estuaries. Abundance estimates, site fidelity and individual ranging patterns were examined over a 3-year period for Indo-Pacific bottlenose dolphins (Tursiops aduncus) inhabiting the Clarence River (CR) and Richmond River (RR) estuaries in northern New South Wales, Australia. Mark–recapture analyses estimated 71 (62–81 95% CI) dolphins utilised the CR whereas 34 (19–49 95% CI) used the RR.

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9

Bordoloi, Bobita, and Samujjal Saharia. "Current Status of the Endangered Ganges River Dolphin (Platanista Gangetica), the Aquatic Megafauna in the Brahmaputra River System." Current World Environment 16, no. 2 (2021): 600–606. http://dx.doi.org/10.12944/cwe.16.2.24.

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The Ganges River Dolphin (Platanista gangetica) is the most charismatic aquatic species inhabiting rivers of India, Bangladesh, and Nepal. It is an endangered species that occurs both in the Brahmaputra and Barak river systems in Assam (India). In the Brahmaputra river system, the occurence of ‘hihu’ is primarily confirmed in the mainstream Brahmaputra, the Kulsi river of Kamrup district, and the Subansiri river of Lakhimpur district. The dolphins inhabit river confluences or tributary junctions followed by river meanderings with the prevalence of eddy counter-currents and prey-fish abundance.

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10

Shah, Deep Narayan, Amit Poudyal, Gopal Sharma, Sarah Levine, Naresh Subedi, and Maheshwor Dhakal. "Status, distribution, threats, and conservation of the Ganges River Dolphin Platanista gangetica (Mammalia: Artiodactyla: Cetacea) in Nepal." Journal of Threatened Taxa 12, no. 1 (2020): 15106–13. http://dx.doi.org/10.11609/jott.4397.12.1.15106-15113.

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The Ganges River Dolphin Platanista gangetica has been classified as Endangered in the IUCN Red List of Threatened Species. The IUCN changed its status from ‘Vulnerable’ to ‘Endangered’ in 1996 as the species population was declining in its entire distribution range. It is, however, classified as ‘Critically Endangered’ in Nepal. Historically, the freshwater cetacean has been documented in the Karnali, Koshi, Narayani, and Mahakali basins. With their population and distribution range in decline, the Ganges River Dolphin (GRD) is no longer found in the Mahakali River system, which demarcates an

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11

Baki, Mohammad Abdul, Naser Ahmed Bhouiyan, Md Saiful Islam, Shayer Mahmood Ibney Alam, Shibananda Shil, and Md Muzammel Hossain. "Present Status of Ganges River DolphinsPlatanista gangetica gangetica(Roxburgh, 1801) in the Turag River, Dhaka, Bangladesh." International Journal of Zoology 2017 (2017): 1–7. http://dx.doi.org/10.1155/2017/8964821.

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Freshwater ecosystem degradation in the Turag River basin is increasing due to rising human settlement, reduced water flow during the dry season, new large land development projects, and toxic emissions caused by brick kilns. The population of river dolphins was estimated through surveys carried out from December 2012 to November 2013. Surveys were conducted on a fortnightly basis. The dolphins were counted within an 18.4 km stretch (known to be the most polluted stretch) of the 75 km long river. A total of 62 dolphin sightings were recorded, both as individual sightings and as groups. The hig

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12

Smith, Brian D., Benazir Ahmed, Muhammad Edrise Ali, and Gill Braulik. "Status of the Ganges river dolphin or shushuk Platanista gangetica in Kaptai Lake and the southern rivers of Bangladesh." Oryx 35, no. 1 (2001): 61–72. http://dx.doi.org/10.1046/j.1365-3008.2001.00153.x.

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AbstractSurveys for shushuks Platanista gangetica were conducted during January to April 1999 in Kaptai Lake and the southern rivers of Bangladesh. A population of at least 125 dolphins was recorded in the Karnaphuli and Sangu rivers and connecting canal. The overall encounter rate was 0.76 dolphins per km. Density was highest in the lower reaches of the Sangu, where we recorded 1.36 dolphins per km. These rates are fairly high when compared with other areas of shushuk distribution. Dolphin movements in the Sikalbaha–Chandkhali Canal were consistent with it being used as a corridor for migrati

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13

Hossain, Md Muzammel, Shayer Mahmood Ibney Alam, Mohammad Abdul Baki, and Naser Ahmed Bhouiyan. "Ganges River Dolphin." Bulletin of the Ecological Society of America 97, no. 2 (2016): 183–87. http://dx.doi.org/10.1002/bes2.1227.

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14

Khan, Mohd Shahnawaz. "Factors affecting the survival of Indus River dolphin and species tolerance towards anthropogenic pressures." Marine and Freshwater Research 68, no. 7 (2017): 1245. http://dx.doi.org/10.1071/mf16001.

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There is broad consensus among ecosystem experts that river dolphins, as top predators, can structure riverine ecosystems and benefit biodiversity. The effects of dolphins on rivers and vice versa do not operate in isolation, but are context dependent, being conditioned by other factors such as human interference. Based on the aforesaid presumption, the focus of the present study was on quantifying the factors responsible for the decline of the Indus River dolphin and species tolerance towards these factors in the upper sub-basin of the Indus River system (River Beas, India). Dolphins avoided

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15

Reeves, Randall R., and Abdul Aleem Chaudhry. "Status of the Indus River dolphin Platanista minor." Oryx 32, no. 1 (1998): 35–44. http://dx.doi.org/10.1046/j.1365-3008.1998.00016.x.

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The endemic freshwater dolphins in the Indus River system of Pakistan, Platanista minor, have been considered endangered since the early 1970s. Measures taken to protect them from deliberate capture seem to have stopped a rapid decline, and combined counts in Sindh and Punjab provinces since the early 1980s suggest a total population of at least a few hundred animals. Severe problems remain, however. In addition to the risks inherent to any species with an effective population size in the low hundreds (at most), these dolphins are subject to long-term threats associated with living in an artif

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16

Alam, Shayer Mahmood Ibney, and Noor Jahan Sarker. "Status and Distribution of the Gangetic Dolphin, Platanista Gangetica Gangetica (Roxburgh, 1801) In River Buriganga During 2003-2004 and Its Conservation." Bangladesh Journal of Zoology 40, no. 1 (2012): 21–31. http://dx.doi.org/10.3329/bjz.v40i1.12890.

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Studies on the population status, distribution and conservation issues of the Gangetic dolphin Platanista gangetica gangetica were undertaken in the river Buriganga from November 2003 to November 2004. A total of 29 sightings with the highest of five sightings and a best-high-low estimate of 9-11-7 individuals were recorded in November 2004, while in the months of August and October no dolphin was observed. The mean density was 0.25 dolphin/km and the highest encounter rate was 0.29 sightings/km. Of the total sightings, 41.38% were in the groups of more than one individuals. Of the observed do

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17

Choudhary, Sunil K., Brian D. Smith, Subhasis Dey, Sushant Dey, and Satya Prakash. "Conservation and biomonitoring in the Vikramshila Gangetic Dolphin Sanctuary, Bihar, India." Oryx 40, no. 2 (2006): 189–97. http://dx.doi.org/10.1017/s0030605306000664.

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From March 2001 to December 2003 eight direct count surveys in an upstream direction were conducted for Ganges river dolphins Platanista gangetica gangetica in the Vikramshila Gangetic Dolphin Sanctuary, a c. 60 km long segment of the middle Ganges River in Bihar, India. The mean number of dolphins recorded during upstream surveys was 119.4±SD 31.8 (range 88–174), with an encounter rate of 1.8 dolphins km−1 (range 1.4–2.8). During these surveys a rich diversity of other threatened aquatic wildlife was also documented, including the Indian smooth-coated otter Lutrogale perspicillata, gharial Ga

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18

Chowdhury, Mahua Roy, Sangita Mitra, and Saswati Sen. "On the Behaviour, abundance, habitat use and potential threats of the Gangetic Dolphin Platanista gangetica in southern West Bengal, India." Journal of Threatened Taxa 8, no. 9 (2016): 9131. http://dx.doi.org/10.11609/jott.1752.8.9.9131-9137.

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The Ganga River Dolphin Platanista gangetica Roxburgh, 1801 is a globally endangered cetacean found in the River system of Ganga, Brahmaputra and Meghna in Bangladesh and India. A survey and research were conducted from 2012–2014 to explore the behaviour, abundance, habitat use and potential threats of the Dolphin in the lower, middle and upper stretches of the river Ganga and its tributaries in southern West Bengal. The study recorded different types of surfacing patterns with respect to their age class as well as on diurnal activity pattern of the individual. The adults and sub-adults were f

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Rossi-Santos, Marcos R., Leonardo L. Wedekin, and Emygdio L. A. Monteiro-Filho. "Residence and site fidelity of Sotalia guianensis in the Caravelas River Estuary, eastern Brazil." Journal of the Marine Biological Association of the United Kingdom 87, no. 1 (2007): 207–12. http://dx.doi.org/10.1017/s0025315407055683.

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Between April 2002 and April 2005, 210 estuarine dolphin groups were sighted, with 58 animals individually identified. Fifteen dolphins were photo-identified just once, while only two animals were sighted in 15 different months. Some individuals showed long-term residence (more than 3 y). Residence rates showed heterogeneity in the dolphin's permanence of the estuary, with 60% of the individuals with low numbers (<10) and only 7% showing high values for residence (maximum=45.9). Continued resightings of some dolphins support the regular use of the study area by the animals, despite some ind

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20

Limbu, Kul Prasad, and Bhara Raj Subba. "Status of key faunal species in Koshi Tappu Wildlife Reserve after Koshi flood disaster 2008." Nepalese Journal of Biosciences 1 (January 23, 2013): 41–54. http://dx.doi.org/10.3126/njbs.v1i0.7469.

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Present survey was carried out from April 16th to December 15th of 2009 with a view to assess the key faunal species of Koshi Tappu Wildlife Reserve such as Birds, Gangetic Dolphin, Wild water buffalo, different species of fish and their habitats after Koshi flood disaster 2008. Several trips were made within the KTWR using boat for surveying dolphin census, to make checklist of birds and fishes and to study wild water buffalo status. Among 120 species of birds belonging to 44 families and 103 genera were sighted, 27 species were found as winter visitor, 4 species as summer visitor and 89 spec

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Kreb, Daniëlle, and Budiono. "Conservation management of small core areas: key to survival of a Critically Endangered population of Irrawaddy river dolphins Orcaella brevirostris in Indonesia." Oryx 39, no. 2 (2005): 178–88. http://dx.doi.org/10.1017/s0030605305000426.

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Indonesia's only freshwater dolphin is the facultative Irrawaddy river dolphin Orcaella brevirostris in the Mahakam River in East Kalimantan, Borneo. To clarify the status of this Critically Endangered subpopulation we carried out a series of surveys from early 1999 until mid 2002 on abundance, habitat use, population dynamics and threats. Our estimates of total population size were 33–55 dolphins (95% confidence limits 31–76) based on direct counts, strip-transect analysis, and Petersen and Jolly-Seber mark-recapture analyses of photo-identified individuals. Mean minimum annual birth and mort

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22

Milinkovitch, M. C. "Deciphering River Dolphin Evolution." Science 294, no. 5543 (2001): 787. http://dx.doi.org/10.1126/science.294.5543.787.

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23

Mosquera-Guerra, F., F. Trujillo, M. Oliveira-da-Costa, et al. "Home range and movements of Amazon river dolphins Inia geoffrensis in the Amazon and Orinoco river basins." Endangered Species Research 45 (July 29, 2021): 269–82. http://dx.doi.org/10.3354/esr01133.

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Studying the variables that describe the spatial ecology of threatened species allows us to identify and prioritize areas that are critical for species conservation. To estimate the home range and core area of the Endangered (EN) Amazon river dolphin Inia geoffrensis, 23 individuals (6&female;, 17&male;) were tagged during the rising water period in the Amazon and Orinoco river basins between 2017 and 2018. The satellite tracking period ranged from 24 to 336 d (mean ± SE = 107 ± 15.7 d), and river dolphin movements ranged from 7.5 to 298 km (58 ± 13.4 km). Kernel density estimates were

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24

Smith, Brian D., M. Abdullah Abu Diyan, Rubaiyat Mowgli Mansur, Elisabeth Fahrni Mansur, and Benazir Ahmed. "Identification and channel characteristics of cetacean hotspots in waterways of the eastern Sundarbans mangrove forest, Bangladesh." Oryx 44, no. 2 (2010): 241–47. http://dx.doi.org/10.1017/s0030605309990159.

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AbstractSightings data of two freshwater-dependent cetaceans, the Ganges River dolphin Platanista gangetica gangetica and Irrawaddy dolphin Orcaella brevirostris, were recorded by captains of three nature tourism vessels operating in waterways of the eastern Sundarbans mangrove forest, Bangladesh. These data were used to investigate channel-type preferences and identify cetacean hotspots according to a scoring system based on group, individual and calf encounter rates, the co-occurrence of both species, and encounter rates in neighbouring segments recorded during monsoon, post-monsoon and dry

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Smith, Alison M., and Brian D. Smith. "Review of status and threats to river cetaceans and recommendations for their conservation." Environmental Reviews 6, no. 3-4 (1998): 189–206. http://dx.doi.org/10.1139/a99-002.

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River dolphins are among the world's most seriously endangered species, and the baiji (Lipotes vexillifer), endemic to the Yangtze River, China, is likely to become extinct in the near future. Here we review the status of the obligate river dolphins (baiji, bhulan, Platanista minor, susu, Platanista gangetica, and boto, Inia geoffrensis), discuss the threats they face, and present recommendations for their conservation. River dolphins are particularly vulnerable to the activities of humans because of their restricted habitat. Threats vary geographically in their importance, but generally inclu

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Aliaga-Rossel, E., and LA Guizada Doran. "Four decades of research on distribution and abundance of the Bolivian river dolphin Inia geoffrensis boliviensis." Endangered Species Research 42 (August 6, 2020): 151–65. http://dx.doi.org/10.3354/esr01041.

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The Bolivian river dolphin, known locally as the bufeo, is one of 4 species of river dolphin in South America. Endemic to the upper basin of the Madeira in the Bolivian Amazon region, the species is categorized as Endangered on the IUCN Red List. This article provides information related to the geographic distribution of the species, and a review of the studies of its abundance that have been conducted in Bolivia since the 1970s. We discuss the surveys, the analysis methods used in the different studies, and the ways in which these methods might influence the population estimates. We found 63

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27

Roy Chowdhury, Gargi, Kanad Roy, Naman Goyal, Ashwin Warudkar, Rashid Hassnain Raza, and Qamar Qureshi. "On the evidence of the Irrawaddy Dolphin Orcaella brevirostris (Owen, 1866) (Mammalia: Cetartiodactyla: Delphinidae) in the Hooghly River, West Bengal, India." Journal of Threatened Taxa 12, no. 8 (2020): 15905–8. http://dx.doi.org/10.11609/jott.5171.12.8.15905-15908.

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We report the presence and status of the Irrawaddy Dolphin Orcaella brevirostris in the Hooghly River of West Bengal, India. These observations were made while conducting our field work on the Ganges River Dolphin, which involved vessel-based surveys as well as intensive monitoring from an anchored boat.

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Barnett, Adrian. "New river dolphin discovered in Brazil." New Scientist 221, no. 2953 (2014): 16. http://dx.doi.org/10.1016/s0262-4079(14)60168-8.

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Chen, Peixun, and Ding Wang. "The Chinese river dolphin, Lipotes vexillifer." Endeavour 12, no. 4 (1988): 176–78. http://dx.doi.org/10.1016/0160-9327(88)90163-9.

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Palmer, Carol, Guido J. Parra, Tracey Rogers, and John Woinarski. "Collation and review of sightings and distribution of three coastal dolphin species in waters of the Northern Territory, Australia." Pacific Conservation Biology 20, no. 1 (2014): 116. http://dx.doi.org/10.1071/pc140116.

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On a global scale, the coastal waters of the Northern Territory (NT), Australia, are relatively undisturbed, but the pace and extent of coastal development is increasing. Three species of dolphin occur in these waters: the Australian snubfin Orcaella heinsohni, Indo-Pacific humpback Sousa chinensis and bottlenose Tursiops sp., but their distribution is poorly documented. To provide a broader distributional context and complement recent local-scale population studies (Palmer in press), we review the broader distribution of these coastal dolphins, via the collation of historic and contemporary d

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De Boer, Marijke Nita. "Cetaceans observed in Suriname and adjacent waters." Latin American Journal of Aquatic Mammals 10, no. 1 (2015): 2–19. http://dx.doi.org/10.5597/lajam00189.

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Very little information exists about the cetaceans in the Guianas: Suriname and its neighboring countries Guyana and French Guiana. During a dedicated cetacean survey carried out from a geophysical seismic survey vessel in the offshore waters of Suriname (May-September 2012), the occurrence of 13 cetacean species was documented and of those, 11 were newly documented for this area. The species observed by the author included sperm whale (Physeter macrocephalus), Bryde’s whale (Balaenoptera edeni), false killer whale (Pseudorca crassidens), melon-headed whale (Peponocephala electra), roughtoothe

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Sholl, Thais Guimarães Corrêa, Fabrícia Ferreira do Nascimento, Orilio Leoncini, Cibele Rodrigues Bonvicino, and Salvatore Siciliano. "Taxonomic identification of dolphin love charms commercialized in the Amazonian region through the analysis of cytochrome b DNA." Journal of the Marine Biological Association of the United Kingdom 88, no. 6 (2008): 1207–10. http://dx.doi.org/10.1017/s002531540800043x.

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Previous studies identified the Amazon river dolphin (Inia geoffrensis) as the species frequently traded in public markets of Pará and Amazonas State (Brazil). In order to investigate the geographic origin and the taxonomic identification of these specimens we analysed 21 samples provided by residents of the city of Belém and vicinities (Pará State, Brazil), presumably purchased in the ‘Ver-o-Peso’ Market (Belém) or the Manaus Municipal Market. DNA was extracted from dehydrated genitalia or from genitalia conserved in alcohol and the cytochrome b gene was PCR-amplified. Phylogenetic analyses s

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., G. S. Gachal, and F. M. Slater . "Barrages, Biodiversity and the Indus River Dolphin." Pakistan Journal of Biological Sciences 7, no. 5 (2004): 797–801. http://dx.doi.org/10.3923/pjbs.2004.797.801.

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KELKAR, NACHIKET, JAGDISH KRISHNASWAMY, SUNIL CHOUDHARY, and DIPANI SUTARIA. "Coexistence of Fisheries with River Dolphin Conservation." Conservation Biology 24, no. 4 (2010): 1130–40. http://dx.doi.org/10.1111/j.1523-1739.2010.01467.x.

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35

Fürstenau Oliveira, Julia S., George Georgiadis, Silvana Campello, Reuber A. Brandão, and Simone Ciuti. "Improving river dolphin monitoring using aerial surveys." Ecosphere 8, no. 8 (2017): e01912. http://dx.doi.org/10.1002/ecs2.1912.

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Khatiwada, Sunil, Mukesh K. Chalise, and Shailendra Sharma. "Distribution and Habitat Status of Ganges River Dolphin (Platanista gangetica) in Mohana River Segment of Western Nepal." Journal of Institute of Science and Technology 24, no. 2 (2019): 58–67. http://dx.doi.org/10.3126/jist.v24i2.27258.

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An endangered species of Ganges River dolphin (Platanista gangetica) in Mohana River and its population status was reported employing synchronized point count. The physicochemical parameters of water were determined using pseudo-random water sampling along various segments of the river. Mean sighting rate during monsoon, 2018 and pre-monsoon, 2016 were one dolphin per 1.355 km and 1.65 km, respectively, with a clumped distribution. Physico-chemical parameters test showed that Mohana River was slightly alkaline with high turbidity and low vulnerability to an acid deposition with a high amount o

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Mayorga, Luis Felipe S. P., Ralph E. T. Vanstreels, Renata C. C. Bhering, et al. "Strandings of cetaceans on the Espírito Santo coast, southeast Brazil, 1975–2015." ZooKeys 948 (July 13, 2020): 129–52. http://dx.doi.org/10.3897/zookeys.948.50468.

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Espírito Santo state is located on the eastern margin of Brazil, in a transitional tropical-subtropical area (18°S–21°S) dominated by oligotrophic waters. With the exception of humpback whales (Megaptera novaeangliae), the cetacean community of Espírito Santo has been understudied. In addition to the chronic impacts from fisheries, marine pollution, urban development, and coastal habitat degradation, in November 2015 the cetacean communities of Espírito Santo were challenged by the greatest environmental disaster in Brazil’s history. The Mariana dam disaster caused 60 million cubic meters of m

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Paudel, Shambhu, John L. Koprowski, Usha Thakuri, and Ajay Karki. "In-stream habitat availability for river dolphins in response to flow: Use of ecological integrity to manage river flows." PLOS ONE 16, no. 7 (2021): e0241099. http://dx.doi.org/10.1371/journal.pone.0241099.

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Population decline and extinction risk of river dolphins are primarily associated with flow alteration. Previous studies predominantly highlighted maintenance of adequate flow for low water seasons when habitats contract and the risk of local extinction escalates. Although river dolphins are sensitive to reduction in river flow, no studies quantify the relationships between flow and ecology of river dolphins to mitigate the potential adverse impacts of flow alteration. We quantify the relationships between flow and the ecology of river cetaceans concerning Ganges River dolphins (GRD; Platanist

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Melo-Santos, Gabriel, Angélica Lúcia Figueiredo Rodrigues, Rodrigo Hipólito Tardin, et al. "The newly described Araguaian river dolphins, Inia araguaiaensis (Cetartiodactyla, Iniidae), produce a diverse repertoire of acoustic signals." PeerJ 7 (April 19, 2019): e6670. http://dx.doi.org/10.7717/peerj.6670.

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The recent discovery of the Araguaian river dolphin (Inia araguaiaensis) highlights how little we know about the diversity and biology of river dolphins. In this study, we described the acoustic repertoire of this newly discovered species in concert with their behaviour. We analysed frequency contours of 727 signals (sampled at 10 ms temporal resolution). These contours were analyzed using an adaptive resonance theory neural network combined with dynamic time-warping (ARTwarp). Using a critical similarity value of 96%, frequency contours were categorized into 237 sound-types. The most common t

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Araújo, Claryana C., and John Y. Wang. "The dammed river dolphins of Brazil: impacts and conservation." Oryx 49, no. 1 (2014): 17–24. http://dx.doi.org/10.1017/s0030605314000362.

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AbstractA major threat to river dolphins in Brazil is habitat loss and fragmentation as a result of the construction of hydroelectric dams. We examine the degree of overlap between the distributions of two river dolphin species (boto Inia geoffrensis and tucuxi Sotalia fluviatilis) and hydroelectric projects and provide an initial quantification of impacts. The locations of dams were overlaid onto a map of the known distributions of the dolphins. Two types of impacts were evaluated: population fragmentation and effects on prey. For each of these a binary score (for absence or presence) was ass

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Reeves, Randall R., Abdul Aleem Chaudhry, and Umeed Khalid. "Competing for Water on the Indus Plain: Is There a Future for Pakistan's River Dolphins?" Environmental Conservation 18, no. 4 (1991): 341–50. http://dx.doi.org/10.1017/s0376892900022591.

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The total population of Indus Dolphins, numbering perhaps 500 individuals, is subdivided by barrages into five or six subpopulations. At least two of these are so small (fewer than 20 animals) that they have little chance of survival past the next few decades. If dispersal occurs at all, because of barrages it will apparently only be downstream, causing a net loss to upstream subpopulations. The subpopulation in Sindh Dolphin Reserve, between Sukkur and Guddu barrages, is relatively large and apparently well-protected. However, the small size of the Reserve, its geographical position near the

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Walsh, John, and Khin Kyi Zin. "Achieving Sustainable Community-Based Tourism in Rural Myanmar: The Case of River Ayeyarwaddy Dolphin Tourism." Zagreb International Review of Economics and Business 22, no. 2 (2019): 95–109. http://dx.doi.org/10.2478/zireb-2019-0022.

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Abstract Community-based tourism is recognised as being a potentially important means by which economic development can take place in rural Myanmar. One particular project in this vein is the dolphin-based tourism organized at six villages on the River Ayeyarwaddy in the northern Mandalay division. Qualitative research featuring personal interviewing of international tourists and service providers in the region indicated the potential for this project but also the formidable problems of poor connectivity and service provision that will need to be overcome to achieve success. The threats to the

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Knopf, Julian P., Patrick R. Hof, and Helmut H. A. Oelschläger. "The Neocortex of Indian River Dolphins (Genus Platanista): Comparative, Qualitative and Quantitative Analysis." Brain, Behavior and Evolution 88, no. 2 (2016): 93–110. http://dx.doi.org/10.1159/000448274.

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We investigated the morphology of four primary neocortical projection areas (somatomotor, somatosensory, auditory, visual) qualitatively and quantitatively in the Indian river dolphins (Platanista gangetica gangetica, P. gangetica minor) with histological and stereological methods. For comparison, we included brains of other toothed whale species. Design-based stereology was applied to the primary neocortical areas (M1, S1, A1, V1) of the Indian river dolphins and compared to those of the bottlenose dolphin with respect to layers III and V. These neocortical fields were identified using existi

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Reeves, Randall R., and Abdul Aleem Chaudhry. "Status of the Indus River dolphin Platanista minor." Oryx 32, no. 01 (1998): 35. http://dx.doi.org/10.1017/s0030605300029744.

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Hooper, Rowan. "World's largest river dolphin is pretty in pink." New Scientist 212, no. 2843 (2011): 24–25. http://dx.doi.org/10.1016/s0262-4079(11)63081-9.

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Sinha, R. K. "An alternative to dolphin oil as a fish attractant in the Ganges River system: conservation of the Ganges River dolphin." Biological Conservation 107, no. 2 (2002): 253–57. http://dx.doi.org/10.1016/s0006-3207(02)00058-7.

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Durden, Wendy Noke, Eric D. Stolen, Teresa Jablonski, et al. "Abundance and demography of common bottlenose dolphins (Tursiops truncatus truncatus) in the Indian River Lagoon, Florida: A robust design capture-recapture analysis." PLOS ONE 16, no. 4 (2021): e0250657. http://dx.doi.org/10.1371/journal.pone.0250657.

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Common bottlenose dolphins (Tursiops truncatus truncatus) inhabiting the Indian River Lagoon (IRL) estuarine system along the east coast of Florida are impacted by anthropogenic activities and have had multiple unexplained mortality events. Given this, managers need precise estimates of demographic and abundance parameters. Mark-recapture photo-identification boat-based surveys following a Robust Design were used to estimate abundance, adult survival, and temporary emigration for the IRL estuarine system stock of bottlenose dolphins. Models allowed for temporary emigration and included a param

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Dharmadi, Dharmadi, Dede Irving Hartoto, Syahroma Husni Nasution, and Dian Oktaviani. "DISTRIBUSI SPASIAL, STATUS PEMANFAATAN, DAN UPAYA KONSERVASI PESUT MAHAKAM (Orcaella brevirostris) DI KALIMANTAN TIMUR." Jurnal Penelitian Perikanan Indonesia 15, no. 1 (2017): 49. http://dx.doi.org/10.15578/jppi.15.1.2009.49-58.

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Penelitian dilakukan pada tahun 2004 - 2006 di Danau Semayang dan Muara Kaman (bagian dari Sungai Mahakam), Kalimantan Timur, melalui survei lapangan dan wawancara langsung dengan nelayan, masyarakat, dan Dinas Perikanan, Dinas Perlindungan Hutan dan Pelestarian Alam. Tujuan penelitian ini adalah untuk mengetahui penyebaran secara spasial, status pemanfaatan, dan upaya konservasi pesut Mahakam (Orcaella brevirostris). Hasil pengamatan menunjukkan bahwa distribusi pesut Mahakam secara spasial terdapat di Muara Kaman, Muara Sungai Pela Kecil, muara Sungai Pela Besar, Danau Semayang, dan Danau Me

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Wang, Xianyan, Fuxing Wu, Samuel T. Turvey, Massimiliano Rosso, and Qian Zhu. "Seasonal group characteristics and occurrence patterns of Indo-Pacific humpback dolphins (Sousa chinensis) in Xiamen Bay, Fujian Province, China." Journal of Mammalogy 97, no. 4 (2016): 1026–32. http://dx.doi.org/10.1093/jmammal/gyw002.

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Abstract Monthly field surveys were conducted between August 2010 and July 2015 to explore seasonal group characteristics and occurrence patterns of Indo-Pacific humpback dolphins (Sousa chinensis) in Xiamen Bay, China. Dolphins formed larger groups in winter and spring (dry seasons) than in summer and autumn (wet seasons; U = 1,564.00, P &lt; 0.001). Sighting encounter rates were higher during the wet season than during the dry season (U = 181.00, P &lt; 0.001), while individual encounter rates were not significantly different between seasons (F = 0.494, d.f. = 3, P = 0.688). Dolphin

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Sugimatsu, Harumi, Junichi Kojima, Tamaki Ura, et al. "Advanced Technique for Automatic Detection and Discrimination of a Click Train With Short Interclick Intervals From the Clicks of Ganges River Dolphins (Platanista gangetica gangetica) Recorded by a Passive Acoustic Monitoring System Using Hydrophone Arrays." Marine Technology Society Journal 48, no. 3 (2014): 167–81. http://dx.doi.org/10.4031/mtsj.48.3.15.

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AbstractTo understand the biosonar click characteristics of Ganges river dolphins (adults, young adults, and calves) in a wild environment along with periodic visual observations, an ongoing program for long-term in situ monitoring has been carried out using a passive acoustic monitoring (PAM) system. During monitoring phase 4 (2012), migrating Ganges river dolphin groups with small calves were visually observed, and click trains having a short interclick interval (ICI: from 6 to 12 ms) were concurrently found from the acoustic data corresponding to the period. Click trains having a short ICI

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