Ashwin Viswanathan

Ashwin Viswanathan
Nature Conservation Foundation

PhD

About

24
Publications
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59
Citations

Publications

Publications (24)
Article
We present an overview of the global spatiotemporal distribution of avian biodiversity, changes in our knowledge of that biodiversity, and the extent to which it is imperilled. Birds are probably the most completely inventoried large taxonomic class of organisms, permitting a uniquely detailed understanding of how the Anthropocene has shaped their...
Article
Full-text available
We present an overview of the global spatiotemporal distribution of avian biodiversity, changes in our knowledge of that biodiversity, and the extent to which it is imperilled. Birds are probably the most completely inventoried large taxonomic class of organisms, permitting a uniquely detailed understanding of how the Anthropocene has shaped their...
Preprint
Purpose Compared to nasopharyngeal/oropharyngeal swabs, non-invasive saliva samples have enormous potential for scalability and routine population screening of SARS-CoV-2. In this study, we are investigating the efficacy of saliva samples relative to nasopharyngeal/oropharyngeal swabs for use as a direct source for the RT-PCR based SARS-CoV-2 detec...
Article
Full-text available
Citizen-science driven exercises (e.g., bird surveys) and online platforms (e.g., eBird) provide voluminous data on bird occurrence but the data quality is often compromised. Bird atlases are based on standardized surveys and describe the distribution of bird species over a predefined region and have less biases, and thus are better suited for use...
Article
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We examined photographs in the public domain and found a previously undescribed pattern in the geographic distribution of two distinctive breeding morphs of the Black-breasted Weaver Ploceus benghalensis. Clear geographic separation points to the species being polytypic due to allopatry. Analysis of song and molecular genetics may help confirm our...
Article
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Increasing habitat fragmentation leads to wild populations becoming small, isolated, and threatened by inbreeding depression. However, small populations may be able to purge recessive deleterious alleles as they become expressed in homozygotes, thus reducing inbreeding depression and increasing population viability. We used whole-genome sequences f...
Article
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A group of Indian scientists including botanists, entomologists, ornithologists, mammalogists, herpetologists, aquatic fauna specialists, hydrologists, geographers, and social scientists, many with research experience in northeastern India, including the Dibang Valley in Arunachal Pradesh, have conducted a peer-review of the Technical Report prepar...
Preprint
Full-text available
Birds are in general decline around the world, but we know little about the status of India's birds and the threats they face. Status assessments of birds are often informed by data generated from repeated, long-term, structured surveys, but nationwide surveys are extremely volunteer intensive and have never been conducted in India. India, however,...
Article
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Density-dependent interactions between plants and their natural enemies, including fungal pathogens and insect herbivores, help maintain plant species coexistence and diversity at local scales (α-diversity). However, turnover in plant species composition across space also contributes to biodiversity at larger spatial scales (β-diversity). Despite m...
Article
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1.In diverse ecosystems, organisms cluster together in such a manner that the frequency distribution of cluster‐sizes is a power‐law function. Spatially‐explicit computational models of ecosystems suggest that a loss of such power‐law clustering may indicate a loss of ecosystem resilience; the empirical evidence in support for this hypothesis has b...
Article
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Pathogenic interactions between fungi and plants facilitate plant species coexistence and tropical rainforest diversity. Such interactions, however, may be affected by forest fragmentation as fungi are susceptible to anthropogenic disturbance. To examine how fragmentation affects fungus-induced seed and seedling mortality, we sowed seeds of six pla...
Article
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Seed dispersal studies have primarily examined dispersal as a function of distance from the parent tree and/or heterogeneity in dispersal due to animal use of nesting, roosting and sleeping sites. However, non-random heterogeneity in seed dispersal is also likely to result from the post-foraging behavior and movement of frugivores which prefer cert...
Article
Full-text available
For most of Northeast India's diverse assemblage of small carnivores, direct observations and ecological information are limited. Opportunistic direct observations and camera-trap records from 2008 to 2013 in eastern Arunachal Pradesh recorded 11 small carnivore species of the 20 likely to occur. Observations included the first confirmed Small-toot...

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