Environmental constraints on seabird productivity, abundance, and distribution across spatiotemporal scales
PhD research (2020 - Date)
Supervised by Amanda Bates, Shawn Leroux & Dave Fifield
My doctoral research aims to answer the overarching question: how does environmental change constrain seabird productivity, abundance, and distribution across space and time? Through coupling Western science (fieldwork, long-term timeseries, and modern statistical tools) with Indigenous knowledge, I aim to respectfully co-produce knowledge about the species and populations with the greatest limitations to past and future environmental change. My ultimate goal is to spearhead conservation initiatives that sustain and restore threatened and culturally important species and ecosystems, and to advocate for Inuit food security and livelihood.
This research is a part of the Sustainable Nunatsiavut Futures project.
Richards, C., Collins, S.M., Fifield, D. & Bates, A.E. (in prep) ‘Burrows offer thermal protection against extreme events for two threatened seabird species.’
The link between seabird traits and anthropogenic threats
MSc research (2018 - 2020)
Supervised by Amanda Bates, Dave Fifield and Shawn Leroux
Collaborators: Robert Cooke, Diana Bowler and Kristina Boerder
Seabirds are heavily threatened by anthropogenic activities and their conservation status is deteriorating rapidly. Key goals for successful management and conservation are to identify vulnerable species, and to evaluate conservation gains. Here, we couple a comprehensive dataset of traits with International Union for Conservation of Nature (IUCN) Red List extinction risk categories, and threat data for all 341 seabird species. We reveal seabirds segregate in trait space based on threat status, and anthropogenic impacts are selectively removing large, long-lived, pelagic surface feeders with small habitat breadths. Furthermore, we quantify species’ vulnerability to longline, trawl and purse seine bycatch, and find bycatch mitigation could successfully conserve species’ traits and ecosystem functions at a global scale. Our results suggest that targeted conservation strategies must be implemented to ensure a functionally similar suite of seabirds will not be lost in the near future.
Richards, C., Cooke, R. S. C. & Bates, A. E. (2021) 'Biological traits of seabirds predict extinction risk and vulnerability to anthropogenic threats', Global Ecology and Biogeography, 30: 973–986. https://doi.org/10.1111/geb.13279
Richards, C., Cooke, R. S. C., Bowler, D., Boerder, K. & Bates, A. E. (2022) ‘Species’ traits and exposure as a future lens for quantifying seabird bycatch vulnerability in global fisheries’, Avian Conservation & Ecology, 17(1):34. https://doi.org/10.5751/ACE-02033-170134
Richards, C., Cooke, R. S. C., Bowler, D., Boerder, K. & Bates, A. E. (2021) ‘Bycatch mitigation could prevent strong changes in the ecological strategies of seabird communities across the globe’. bioRxiv.
Manx shearwater rafting behaviour around Skomer Island
BSc research (2016 - 2017)
Supervised by Amanda Bates
Collaborators: Oliver Padget, Tim Guilford, Oxford Navigation Group
Before visiting or leaving their remote island colonies, seabirds often engage in a behaviour termed "rafting", where birds sit, often in groups, on the water close to the colony. Despite rafting being a widespread behaviour across many seabird taxa, the functional significance of rafting remains unknown. Here we combine global positioning system (GPS) tracks, observational and wind condition data to investigate correlates of rafting behaviour in Manx shearwaters (Puffinus puffinus) at a large colony on Skomer Island, Wales. We test (1) the influence of wind direction on rafting location and (2) whether raft size changes with respect to wind speed. Our approach further allows us to describe day-night trends in (3) raft distance from shore through time; (4) the number of birds present in the nearshore waters through time; and (5) spatial patterns of Manx shearwater rafts in marine waters adjacent to the breeding colony. We find no evidence that wind direction, for our study period, influences Manx shearwater rafting location, yet raft size marginally increases on windier days. We further find rafting birds closer to the shore at night than during the day. Thus, before sunset, birds form a "halo'' around Skomer Island, but this halo disappears during the night as more individuals return from foraging trips and raft nearer the colony on Skomer Island. The halo pattern reforms before sunrise as rafts move away from land and birds leave for foraging. Our results suggest that wind conditions may not be as ecologically significant for rafting locations as previously suspected, but rafting behaviour may be especially important for avoiding predators and cleaning feathers.
Richards, C., Padget, O., Guilford, T. & Bates, A. E. (2019) ‘Manx shearwater (Puffinus puffinus) rafting behaviour revealed by GPS-tracking and behavioural observations’, PeerJ , 7:e7863. https://doi.org/10.7717/peerj.7863