• Chimienti, M., Cornulier, T., Owen, E., Bolton, M., Davies, I.M., Travis, J.M.J. & Scott, B.E. (2016) "The use of an unsupervised learning approach for characterizing latent behaviors in accelerometer data" Ecology and Evolution ():
  • Sandvik, H., Barrett, R.T., Erikstad, K.E., Myksvoll, M., Vikebø, F., Yoccoz, N.G., Anker-Nilssen, T., Lorentsen, S-H., Reiertsen, T.K. Skaröhamar, J., Skern-Mauritzen, M. & Systad, G.H. (2016) "Modelled drift patterns of fish larvae link coastal morphology to seabird colony distribution" Nature Communications 7:11599
  • Shoji, A., Aris-Brosou, S., Owen, E., Bolton M., Boyle, D., Fayet, A., Dean, B., Kirk, H., Freeman, R., Perrins, C. & Guilford, T. (2016) "Foraging flexibility and search patterns are unlinked during breeding in a free-ranging seabird" Mar Biol 163:72
    [notes] In order to maximize foraging efficiency in a varying environment, predators are expected to optimize their search strategy. Environmental conditions are one important factor affecting these movement patterns, but variations in breeding constraints (self-feeding vs. feeding young and self-feeding) during different breeding stages (incubation vs. chick-rearing) are often overlooked, so that the mechanisms responsible for such behavioral shifts are still unknown. Here, to test how search patterns are affected at different breeding stages and to explore the proximate causes of these variations, we deployed data loggers to record both position (global positioning system) and dive activity (time–depth recorders) of a colonial breeding seabird, the razorbill Alca torda. Over a period of 3 years, our recordings of 56 foraging trips from 18 breeders show that while there is no evidence for individual route fidelity, razorbills exhibit higher foraging flexibility during incubation than during chick rearing, when foraging becomes more focused on an area of high primary productivity. We further show that this behavioral shift is not due to a shift in search patterns, as reorientations during foraging are independent of breeding stage. Our results suggest that foraging flexibility and search patterns are unlinked, perhaps because birds can read cues from their environment, including conspecifics, to optimize their foraging efficiency.
  • Soanes, L.M., Bright, J.A., Angel, L.P., Arnould, J.P.Y., Bolton, M., Berlincourt, M., Lascelles, B., Owen, E., Simon-Bouhet, B. & Green, J.A. (2016) "Defining marine important bird areas: Testing the foraging radius approach" Biological Conservation 196:69-79
  • Warwick-Evans, V.C., Atkinson, P.W., Robinson, L.A. & Green, J.A. (2016) "Predictive Modelling to Identify Near-Shore, Fine-Scale Seabird Distributions during the Breeding Season" PLoS ONE 11(3): e0150592 http://dx.doi.org/10.1371/journal.pone.0150592
  • 2015

  • Harris, M.P., Newell, M.A. & Wanless, S. (2015) "The use of k values to convert counts of individual Razorbills Alca torda to breeding pairs" Seabird 28:30-36
  • Shoji, A., Elliott, K., Fayet, A., Boyle, D., Perrins, C. & Guilford, T. (2015) "Foraging behaviour of sympatric razorbills and puffins" Mar Ecol Prog Ser. 520:257-267
  • 2014

  • Johnston, A., Thaxter, C.B., Austin, G.E., Cook, A.S.C.P., Humphreys, E.M., Still, D.A., Mackay, A., Irvine, R., Webb, A. & Burton, N.H.K. (2014) "Modelling the abundance and distribution of marine birds accounting for uncertain species identification" Journal of Applied Ecology ():-
  • Russell, D.J.F., Wanless, S., Collingham, Y.C., Anderson, B.J., Beale, C., Reid, J.B., Huntley, B. & Hamer, K.C. (2014) "Beyond climate envelopes: bio-climate modelling accords with observed 25-year changes in seabird populations of the British Isles" Diversity Distrib. 1-12
  • Shoji, A., Owen, E., Bolton M., Dean, B., Kirk, H., Fayet, A., Boyle, D., Freeman, R., Perrins, C., Aris-Brosou, S. & Guilford, T. (2014) "Flexible foraging strategies in a diving seabird with high flight cost" Mar Biol 161(9):2121-2129
    [notes] How central-place foragers change search strategy in response to environmental conditions is poorly known. Foragers may vary the total distance travelled and how far they range from the central place in response to variation in the distribution of their prey. One potential reason as to why they would extend the length of their foraging trip and its distance from the colony would be to increase prey quality or quantity, despite incurring higher transit costs. To test this trade-off hypothesis in a species with high flight costs, we recorded the foraging behaviour of razorbills (Alca torca) using state-of-the-art techniques that log both individual horizontal (flight activity) and vertical (dive activity) movements. We show that the distance that razorbills travelled to foraging locations increased with sea-surface temperature, which may relate to higher prey quality or quantity. This relation is supported by an indirect index of patch quality, based on dive profiles, which also increased with travel distance from the colony. Furthermore, we show that this index was highest during the daily peak in diving activity, around midday. Taken together, these results suggest that razorbills are capable of adjusting their search strategies sensitively in response to proximate environmental cues.
  • 2013

  • Camphuysen, C.J. (2013) "Monitoring and assessment of the proportion of oiled Common Guillemots from beached bird surveys in The Netherlands: update winter 2012/13" NIOZ Internal Report, June 2013. Royal Netherlands Institute for Sea Research, Texel
  • Guse, N., Markones, N., Bolduc, F. & Garthe, S. (2013) "Distribution of seabirds in the Lower Estuary and Gulf of St Lawrence (Canada) during summer" Seabird 26:42-70
  • [PDF 47K]

  • Linnebjerg, J.F., Fort, J., Guilford, T., Reuleaux, A., Mosbech, A. & Frederiksen, M. (2013) "Sympatric Breeding Auks Shift between Dietary and Spatial Resource Partitioning across the Annual Cycle" PLoS ONE 8(8): e72987
  • Thaxter, C.B., Daunt, F., Gremillet, D., Harris, M.P., Benvenuti, S., Watanuki,Y., Hamer, K.C. & Wanless, S. (2013) "Modelling the Effects of Prey Size and Distribution on Prey Capture Rates of Two Sympatric Marine Predators" PLoS ONE 8(11): e79915
  • 2012

  • Lauria, V., Attrill, M.J., Pinnegar, J.K., Brown, A., Edwards, M. & Votier, S.C. (2012) "Influence of Climate Change and Trophic Coupling across Four Trophic Levels in the Celtic Sea" PLoS ONE 7(10): e47408
  • Smith, N.A. & Clarke, J.A. (2012) "Endocranial Anatomy of the Charadriiformes: Sensory System Variation and the Evolution of Wing-Propelled Diving" PLoS ONE 7(11): e49584
  • 2011

  • Cook, A.S.C.P., Parsons, M., Mitchell, I. & Robinson, R.A. (2011) "Reconciling policy with ecological requirements in biodiversity monitoring" Mar Ecol Prog Ser 434:267-277
  • http://dx.doi.org/10.3354/meps09244

  • Fauchald, P., Skov, H., Skern-Mauritzen, M., Johns, D. & Tveraa, T. (2011) "Wasp-Waist Interactions in the North Sea Ecosystem" PLoS ONE 6(7): e22729
  • 2010

  • Hjernquist, B. & Hjernquist, M.B. (2010) "The effects of quantity and quality of prey on population fluctuations in three seabird species" Bird Study 57:19-25
  • Paredes, R. & Insley, S.J. (2010) "Sex-biased aggression and male-only care at sea in Brünnich's Guillemots Uria lomvia and Razorbills Alca torda" Ibis 152:48-62

  • Thaxter, C.B., Wanless, S., Daunt, F., Harris, M.P., Benvenuti, S., Watanuki, Y., Gremillet, D. & Hamer, K.C. (2010) "Influence of wing loading on the trade-off between pursuit-diving and flight in common guillemots and razorbills" J. Exp. Biol. 213(7):1018-1025
  • http://dx.doi.org/10.1242/jeb.037390