Papers by Vishnupriya Kolipakam
Scientific Reports
Ganges River dolphins echolocate, but this mechanism is inadequate for poor sonar-echoing objects... more Ganges River dolphins echolocate, but this mechanism is inadequate for poor sonar-echoing objects such as the monofilament gillnets, causing considerable net entanglement related mortalities. Net entanglement related deaths are one of the major causes of cetacean population decline around the world. Experiments were carried out to understand the use of pingers—an acoustic deterrent, in aiding the deterrence of dolphins from fishing nets. Based on the dolphin clicks recorded, in an experimental setup spanning 36 days, a 90% deterrence was found; 22.87 ± 0.71 SE dolphin detection positive minutes per hour near non-pingered nets versus 2.20 ± 0.33 SE per hour near pingered net. Within 30 m radii of nets, visual encounters of non-calf reduced by 52% and calf by 9%, in the presence of pingers. No evidence of habituation to pingers, habitat avoidance in dolphins after pinger removal or a change in fish catch in nets because of pingers was found during the study. While the effectiveness of...
Cite the source of the dataset as: Kolipakam, Vishnupriya, Michael Dunn, Fiona M. Jordan & Annema... more Cite the source of the dataset as: Kolipakam, Vishnupriya, Michael Dunn, Fiona M. Jordan & Annemarie Verkerk. (2018). DravLex: A Dravidian lexical database. Max Planck Institute for Psycholinguistics, Nijmegen, The Netherlands.
Sequence alignment of leopard with co-predators and some prey species of the mitochondrial cytoch... more Sequence alignment of leopard with co-predators and some prey species of the mitochondrial cytochrome b gene used for designing the leopard specific primer. Arrows indicate leopard-specific variation and the region used to design the primers. The forward primer is designed between postions 63 and 85, while the reverse is designed based on leopard specific variation between positions 324 and 339 of the aligned sequences. (JPG 394Â kb)
Sequence of species specific primer designed for leopards, itâ s annealing temperature and produc... more Sequence of species specific primer designed for leopards, itâ s annealing temperature and product size. Table S2: List of species mitochondrial sequences used in alignment for leopard specific primer design, with their accession numbers on NCBI database. (DOCX 76Â kb)
Background Non-invasive sampling has opened avenues for the genetic study of elusive species, whi... more Background Non-invasive sampling has opened avenues for the genetic study of elusive species, which has contributed significantly to their conservation. Where field based identity of non-invasive sample is ambiguous (e.g. carnivore scats), it is essential to establish identity of the species through molecular approaches. A cost effective procedure to ascertain species identity is to use species specific primers (SSP) for PCR amplification and subsequent resolution through agarose gel electrophoresis. However, SSPs if ill designed can often cross amplify non-target sympatric species. Herein we report the problem of cross amplification with currently published SSPs, which have been used in several recent scientific articles on tigers (Panthera tigris) and leopards (Panthera pardus) in India. Since these papers form pioneering research on which future work will be based, an early rectification is required so as to not propagate this error further. Results We conclusively show cross amp...
Erratum to: Schrodingerâ s scat: a critical review of the currently available tiger (Panthera Tig... more Erratum to: Schrodingerâ s scat: a critical review of the currently available tiger (Panthera Tigris) and leopard (Panthera pardus) specific primers in India, and a novel leopard specific primer
Sequence of species specific primer designed for leopards, itâ s annealing temperature and produc... more Sequence of species specific primer designed for leopards, itâ s annealing temperature and product size. Table S2. List of species mitochondrial sequences used in alignment for leopard specific primer design, with their accession numbers on NCBI database. (DOCX 78 kb)
The Dravidian language family consists of about 80 varieties (Hammarström H. 2016 <i>Glotto... more The Dravidian language family consists of about 80 varieties (Hammarström H. 2016 <i>Glottolog 2.7</i>) spoken by 220 million people across southern and central India and surrounding countries (Steever SB. 1998 In <i>The Dravidian languages</i> (ed. SB Steever), pp. 1–39: 1). Neither the geographical origin of the Dravidian language homeland nor its exact dispersal through time are known. The history of these languages is crucial for understanding prehistory in Eurasia, because despite their current restricted range, these languages played a significant role in influencing other language groups including Indo-Aryan (Indo-European) and Munda (Austroasiatic) speakers. Here, we report the results of a Bayesian phylogenetic analysis of cognate-coded lexical data, elicited first hand from native speakers, to investigate the subgrouping of the Dravidian language family, and provide dates for the major points of diversification. Our results indicate that the Dravidi...
The Dravidian language family consists of about 80 varieties (Hammarström H. 2016 <i>Glotto... more The Dravidian language family consists of about 80 varieties (Hammarström H. 2016 <i>Glottolog 2.7</i>) spoken by 220 million people across southern and central India and surrounding countries (Steever SB. 1998 In <i>The Dravidian languages</i> (ed. SB Steever), pp. 1–39: 1). Neither the geographical origin of the Dravidian language homeland nor its exact dispersal through time are known. The history of these languages is crucial for understanding prehistory in Eurasia, because despite their current restricted range, these languages played a significant role in influencing other language groups including Indo-Aryan (Indo-European) and Munda (Austroasiatic) speakers. Here, we report the results of a Bayesian phylogenetic analysis of cognate-coded lexical data, elicited first hand from native speakers, to investigate the subgrouping of the Dravidian language family, and provide dates for the major points of diversification. Our results indicate that the Dravidi...
The Dravidian language family consists of about 80 varieties (Hammarström H. 2016 <i>Glotto... more The Dravidian language family consists of about 80 varieties (Hammarström H. 2016 <i>Glottolog 2.7</i>) spoken by 220 million people across southern and central India and surrounding countries (Steever SB. 1998 In <i>The Dravidian languages</i> (ed. SB Steever), pp. 1–39: 1). Neither the geographical origin of the Dravidian language homeland nor its exact dispersal through time are known. The history of these languages is crucial for understanding prehistory in Eurasia, because despite their current restricted range, these languages played a significant role in influencing other language groups including Indo-Aryan (Indo-European) and Munda (Austroasiatic) speakers. Here, we report the results of a Bayesian phylogenetic analysis of cognate-coded lexical data, elicited first hand from native speakers, to investigate the subgrouping of the Dravidian language family, and provide dates for the major points of diversification. Our results indicate that the Dravidi...
Supplementary Materials containing additional Figures and analysis, as well as a literature revie... more Supplementary Materials containing additional Figures and analysis, as well as a literature review on the 20 sampled Dravidian languages
BEAST 2 xml file that was used for the best-supported analysis, relaxed covarion model with relat... more BEAST 2 xml file that was used for the best-supported analysis, relaxed covarion model with relative mutation rates estimated.
The Dravidian language family consists of about 80 varieties (Hammarström H. 2016 <i>Glotto... more The Dravidian language family consists of about 80 varieties (Hammarström H. 2016 <i>Glottolog 2.7</i>) spoken by 220 million people across southern and central India and surrounding countries (Steever SB. 1998 In <i>The Dravidian languages</i> (ed. SB Steever), pp. 1–39: 1). Neither the geographical origin of the Dravidian language homeland nor its exact dispersal through time are known. The history of these languages is crucial for understanding prehistory in Eurasia, because despite their current restricted range, these languages played a significant role in influencing other language groups including Indo-Aryan (Indo-European) and Munda (Austroasiatic) speakers. Here, we report the results of a Bayesian phylogenetic analysis of cognate-coded lexical data, elicited first hand from native speakers, to investigate the subgrouping of the Dravidian language family, and provide dates for the major points of diversification. Our results indicate that the Dravidian language family is approximately 4500 years old, a finding that corresponds well with earlier linguistic and archaeological studies. The main branches of the Dravidian language family (North, Central, South I, South II) are recovered, although the placement of languages within these main branches diverges from previous classifications. We find considerable uncertainty with regard to the relationships between the main branches.
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Papers by Vishnupriya Kolipakam