Departmental Seminar at CES on 26 June 2024 at 3:00 pm titled "The making and breaking of bird alliances: studying mixed-species flock networks across elevation and habitat gradients" by Shubhra from IISc, Bangalore

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Topic: 
The making and breaking of bird alliances: studying mixed-species flock networks across elevation and habitat gradients
Speaker: 
Shubhra, IISc, Bangalore
Date & Time: 
26 Jun 2024 - 3:00pm
Event Type: 
Departmental Seminar
Venue: 
CES Seminar Hall, 3rd Floor, Biological Sciences Building
Coffee/Tea: 
Before the talk
Abstract:

Interspecific interactions are an important part of species’ life histories and play a role in maintaining ecosystem function. One of the most striking examples of networks of multi-species interactions is exemplified by mixed species flocks (hereby MSFs). MSFs are groups of birds belonging to two or more species that forage and move together. MSF participants benefit from easier access to food resources and predator avoidance, which in turn influences the fitness of participant individuals. Network theory helps elucidate how these associations might change because of environmental and anthropogenic factors. Climate change and habitat degradation by humans pose serious threats to biodiversity, causing range shifts, local extinctions and the disruption of biotic association networks. These changes are much more noticeable across large gradients within a relatively shorter period of time. I plan to study how the network properties of MSFs change along the elevation gradient in Eaglenest Wildlife Sanctuary, Arunachal Pradesh. Additionally, I try to understand the mechanism of changing properties by testing the widely proposed Open Membership Hypothesis. The northern and southern aspects of the Himalayas show a remarkable difference in their habitat, the northern aspect being warmer and drier. Furthermore, in our study area, the southern aspect is relatively undisturbed, whereas the north is more anthropogenically affected. Range shifts among species have begun to occur at different rates across these two aspects, leading to novel interactions on the northern aspect, but not on the southern. I will compare the MSF networks occurring in the two habitat types on either slope of the mountain in the eastern Himalayas and explore if the roles of species change within networks across climate and anthropogenic gradients.