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Volunteer birdwatching survey shows effects of temperatures on population of Jays

April 09, 2019

A study led by researchers at the University of Southampton has used data collected by volunteer bird watchers to study how the importance of wildlife habitat management for British birds depends on changing temperatures.

The team studied data from the British Trust for Ornithology's "Bird Atlas 2007 - 11" on the abundance of Eurasian jays over the whole of Great Britain. The University of Southampton researchers focused on jays for this trial as they are a species of bird known to frequent a mixture of different natural environments.

The findings, published in the journal Methods in Ecology and Evolution, showed that an even range of habitats - forests fields and meadows - are needed in an area of around 200m2 to 1km2 in order for the jays to thrive. An even spread of coniferous and broad leaved forests within this space is also necessary. The data showed that in higher temperatures it is even more important for the jays to have this mix of different surroundings in a relatively small space.

The Bird Atlas 2007 - 11 was one of the most ambitious volunteer projects undertaken. Volunteers for the British Trust for Ornithology were allocated squares of land around the country in which they counted every bird they spotted during winter and in the breeding season.

The University researchers gathered this data and combined with satellite imagery of Great Britain to get a complete picture of the habitats in which there was an abundance of jays and how the changing climates affected their numbers.

The success of the trial means that this method of studying wildlife numbers could be an effective way to look at the impact climate change has on habitats for other species.

Dr Laura Graham Postdoctoral Research Associate at the University of Southampton said: "One of the key challenges in ecological climate change research is gaining an understanding of how climate interacts with changes in habitat to impact species' abundance and distributions. The method we developed for this project allows us to do this."
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Notes to editors:

  1. The paper "Incorporating fine-scale environmental heterogeneity into broad-extent models" is published in the journal Methods in Ecology and Evolution (DOI: 10.1111/2041-210X.13177)
  2. For interviews with Laura Graham, please contact Stephen Bates, Media Relations, University of Southampton. Tel +44 23 8059 2312. Email s.d.bates@southampton.ac.uk
  3. The University of Southampton drives original thinking, turns knowledge into action and impact, and creates solutions to the world's challenges. We are among the top 100 institutions globally (QS World University Rankings 2019). Our academics are leaders in their fields, forging links with high-profile international businesses and organisations, and inspiring a 24,000-strong community of exceptional students, from over 135 countries worldwide. Through our high-quality education, the University helps students on a journey of discovery to realise their potential and join our global network of over 200,000 alumni. http://www.southampton.ac.uk


University of Southampton

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