Current Science

Aashna Sharma ¹, Vineet Kumar Dubey ¹, Prakash Nautiyal ², Jeyaraj Antony Johnson ¹, Yogesh Kumar Rawal ³, Kuppusamy Sivakumar ¹

Affiliations
1 No. 18 Chandrabani, Wildlife Institute of India, Dehradun 248 001, IN
2 Aquatic Biodiversity Unit, Department of Zoology and Biotechnology, Hemwati Nandan Bahuguna Garhwal University, Srinagar 249 161, IN
3 Department of Zoology, Panjab University, Chandigarh 160 014, IN

Abstract

Climate-induced stochastic events bring forth idiosyncratic changes in habitat and community assemblage patterns of an area. Nature governs its priorities in such incidents, where native taxa are preferred over the invasive ‘late-comers’, thus leading to extirpation of the latter, according to the concept of ‘priority effects’¹. This stronghold of nature strictly comes into play when an ecosystem is least altered from its natural state. River Asiganga in Uttarakhand, India was chosen as a case study to understand this theory, where cloudburst-induced flash floods are considered to be a reason for the complete wipe-out of non-native brown trout (Salmo trutta fario), leaving behind the native snow trout (Schizothorax species).

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