PhD Student's Entire Thesis Rests on One Bird Showing Up Again

Fourth-year PhD student Thomas Ringed has entered what his supervisor describes as 'a critical period of uncertainty' after the individually tagged reed warbler upon which his entire doctoral thesis depends failed to return to its breeding site for the second consecutive spring. The bird, designated RW-47 and tagged during Thomas's first field season in 2022, is the subject of a thesis titled 'Site Fidelity and Breeding Success in Acrocephalus scirpaceus: A Longitudinal Individual-Based Study.' The longitudinal study requires RW-47 to return to the same reedbed in successive years. RW-47 has not cooperated. 'The thesis design assumed the bird would come back,' Thomas said, standing at the edge of the reedbed with a pair of binoculars and an expression his field assistant described as 'the look of a man who has bet his academic career on a migrating passerine.' 'I need three years of breeding data from the same individual. I have one year. The bird has been in sub-Saharan Africa for the other two. I can't go to sub-Saharan Africa. My funding doesn't cover that.' His supervisor, Professor Reedbed, has advised Thomas to 'broaden the study design to incorporate other tagged individuals.' Thomas has eleven other tagged birds, all of which returned. 'But the thesis is about RW-47,' he said. 'The introduction is about RW-47. The literature review contextualizes RW-47. Chapter one opens with a description of RW-47 arriving at the reedbed in 2022 and singing from the third reed on the left. I cannot substitute another bird. It would be like recasting the lead in a film.' Thomas's funding runs out in September. RW-47's expected return window closes in May. 'Every morning I go to the reedbed and I listen,' Thomas said. 'I know its song. I have a spectrogram of its song on my phone. I play it sometimes, to remember what hope sounds like.'