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Jathar, G.

Publications and source records attributed to Jathar, G..

4 recordsLinked to original sources

What's next for Indian Ornithology? 101 key research questions

India has a rich history of ornithology, and bird research in this field has expanded considerably in recent decades, spurred by a growing number of birdwatchers and ornithologists. Despite this progress, critical gaps remain. This paper highlights key areas where further research is needed and identifies pressing questions that will shape Indian ornithology in the coming years. Drawing from diverse inputs, we present a curated list of 101 research questions spanning across the various disciplines in ornithology - Natural History, Physiology and Disease Ecology, Behaviour, Population and Community Ecology, Habitat Ecology, Macroecology and Biogeography, Population Genetics and Evolution, Applied/Economic Ornithology and Conservation. The list was compiled through a multi-stage process, starting with a public open call for questions, followed by review and curation by a smaller panel of subject specialists. Each question was independently scored by a panel of experts based on three criteria: generality, novelty, and relevance. To account for variation in scoring styles, scores were normalised using Z-scores. The top 101 research questions were then selected based on these standardised scores. Each question is accompanied by an annotation that describes the significance of the question, and highlights opportunities to address it. While our list of research questions highlights significant research priorities, it is not intended to be exhaustive. Rather, it reflects the perspectives of those involved in its curation, who deemed these questions particularly relevant and impactful towards advancing Indian ornithology. We expect these questions to spark new project ideas among students, researchers, and citizen scientists, while guiding funders, managers, and policymakers toward priority research areas.

ecology↗

Aspect influences vegetation type in the Western Ghats

Western Ghats (WG) of India is one of the important biodiversity hotspots characterized by high levels of species endemism. The length of the rainy season and total rainfall are known to influence regional scale vegetation pattern. A recent study identified two aspect-related modes that influence landscape-scale tree cover (TC) and canopy height (CH) in the WG: north-facing slopes have a higher TC and CH than the south-facing slopes and (ii) higher TC and CH on the west-facing slopes than the east-facing slopes. However, it remains unclear whether these aspect-related asymmetries extend to the vegetation types. Here, with the help of seasonal NDVI variations, we demonstrate that aspect influence vegetation type as well. In general, north and west facing aspects support higher proportion of evergreen forests than the south and east facing slopes. In contrast, the dry deciduous and thorn forests relatively dominate the south and east-facing slopes. This natural heterogeneity in the vegetation type linked to aspect needs to considered while designing ecological research and management plans in the WG.

ecology↗

Southeast and Northeast facing slopes have the Least Tree Cover in Northern and Southern Tropics, respectively

Reforestation in the tropics, one of the most deforested regions, can help mitigate climate change and conserve biodiversity. Its effective implementation requires assessing suitability of a given site for tree growth. By analyzing tree cover (TC) in 127 protected areas across the tropics, we show that southeast and northeast-facing slopes are least favorable for tree growth in the Northern and Southern tropics, respectively. In contrast, northwest (north-, northwest, and west-facing) and southwest (south-, southwest, and west-facing) slopes are more suitable for tree growth in the Northern and Southern hemispheres, respectively. This pattern likely results from the combined effects of Pole-Equator and West-East asymmetries in TC. Tropical reforestation programs, especially in hilly areas with intermediate TC, could benefit from considering the influence of slope direction on tree growth and adopting appropriate plantation strategies.

ecology↗

Monsoonal climate and asymmetric heating facilitate the slope-aspect to influence landscape-scale tree structure in the Western Ghats, India

The regional variation of rainfall and length of the rainy season are identified to control the vegetation distribution in the Western Ghats (WG) of India, one of the important biodiversity hotspots. Here we demonstrate the existence of two new modes related to monsoonal climate and asymmetric solar heating that influence the vegetation structure at the landscape-scale in the WG: (i) the north-facing slopes have a higher tree cover (TC) and canopy height (CH) than the south-facing slopes and (ii) higher TC and CH on the west-facing slopes than the east-facing slopes. The asymmetry associated with these modes increases with the slope angle. The interaction of these modes often leads northwest and southeast aspects to have the highest and lowest TC (and CH), respectively. We thus demonstrate that even in low-latitude regions, the slope-aspect plays an important role in determining the TC and CH if the relief is higher. This fundamental driver of vegetation structure needs to be considered while formulating and executing programs aimed at increasing tree cover and conserving biodiversity, especially in the high relief areas in the tropics having seasonal rainfall, such as in the WG.

ecology↗