• Publications
  • Influence
Plastic Pollution in the World's Oceans: More than 5 Trillion Plastic Pieces Weighing over 250,000 Tons Afloat at Sea
Plastic pollution is ubiquitous throughout the marine environment, yet estimates of the global abundance and weight of floating plastics have lacked data, particularly from the Southern HemisphereExpand
  • 1,621
  • 133
  • PDF
Monitoring the abundance of plastic debris in the marine environment
Plastic debris has significant environmental and economic impacts in marine systems. Monitoring is crucial to assess the efficacy of measures implemented to reduce the abundance of plastic debris,Expand
  • 795
  • 60
  • PDF
Exploitation of mesoscale oceanographic features by grey-headed albatross Thalassarche chrysostoma in the southern Indian Ocean
Breeding grey-headed albatross Thalassarche chrysostoma, tracked from Marion Island (Prince Edward Islands) during November-December 1997 and January-February 1998, showed a strong association withExpand
  • 198
  • 24
  • PDF
Diving Birds in Cold Water: Do Archimedes and Boyle Determine Energetic Costs?
The volume of air trapped in the feathers and the body density of 36 species of water bird were determined by water displacement experiments. Body density was higher and the volume of air trapped inExpand
  • 209
  • 23
African endemics span the tree of songbirds (Passeri): molecular systematics of several evolutionary ‘enigmas’
The deep divergence between the African endemic passerines Picathartidae (rockfowl Picathartes and rockjumpers Chaetops, four species) and the Passerida (ca. 3500 species) suggests an older historyExpand
  • 107
  • 16
A simple technique for counting marine debris at sea reveals steep litter gradients between the Straits of Malacca and the Bay of Bengal.
  • P. Ryan
  • Environmental Science, Medicine
  • Marine pollution bulletin
  • 15 April 2013
A size and distance-based technique was used to assess the distribution, abundance and composition of floating marine debris in the northeast Indian Ocean. Densities of floating litter (>1 cm) wereExpand
  • 88
  • 15
Birds of Africa, south of the Sahara
Forewards 8 Acknowledgements10 Introduction 11 Species accounts 16 Further reading 732 Glossary 733 Illustrated glossary 734 List of Sponsors, Collectors and Subscribers 736 Indexes 740 ScientificExpand
  • 138
  • 15
The incidence and characteristics of plastic particles ingested by seabirds
Abstract The ingestion of plastic was recorded for 36 of 60 seabird species sampled in the southern hemisphere (mostly off southern Africa). Biases of different sampling techniques were considered.Expand
  • 195
  • 13
Seabirds indicate changes in the composition of plastic litter in the Atlantic and south-western Indian Oceans.
  • P. Ryan
  • Biology, Medicine
  • Marine pollution bulletin
  • 1 August 2008
I compare plastic ingested by five species of seabirds sampled in the 1980s and again in 1999-2006. The numbers of ingested plastic particles have not changed significantly, but the proportion ofExpand
  • 131
  • 12
Marine no-take zone rapidly benefits endangered penguin
No-take zones may protect populations of targeted marine species and restore the integrity of marine ecosystems, but it is unclear whether they benefit top predators that rely on mobile pelagicExpand
  • 132
  • 12
  • PDF