From Sprouting to Senescence: Phenological Chronicles of Phytolacca acinosa Roxb. in the Himalayan Highlands

In the era of the Anthropocene, changes in the timing of plant life cycle events serve as prominent biological markers of global environmental shifts. Most studies documenting and analyzing plant phenological changes have been conducted in North America and Europe. Although few studies are available from the Himalayan region, there is a notable scarcity of comparable studies in the developing world, particularly in regions like the Himalaya. To fill this knowledge gap, the present study aims to unravel the vegetative and reproductive phenology of Phytolacca acinosa across Kashmir Himalaya. For this, we selected and tagged 10 healthy individuals to monitor and document the onset and duration of different phenological events, from sprouting to senescence. Further, flowering phenology was assessed using flowering variables such as moment, intensity, and duration. Our results revealed that P. acinosa completes its entire life cycle within 7–8 months, with significant variation in the timing of phenophases across the selected sites. Populations at lower elevations exhibited a clear precedence of vegetative and reproductive phases in their life cycle compared to those at higher elevations. We found that all the phenophases except senescence showed an overlap with the preceding phase. Flowering variables showed significant variation across the sites, with the highest values recorded at low elevations and the lowest values at high elevations. This study is the first attempt to provide useful insights into the phenology of P. acinosa across different habits along an elevation gradient in Kashmir Himalaya. Phenological adjustments, such as advancing or delaying reproductive phases, are crucial strategies for species to optimize reproductive success. Global climate change, characterized by rapid warming and disruptions, particularly during reproductive periods, has notably impacted species at higher elevations. Understanding phenological attributes is vital in contemporary conservation biology and the phenological data from this study will assist in formulating effective strategies for the restoration and conservation of the target species.