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Article
Jennifer C. Cantlay, Auteur ; Steven J. Portugal, Auteur ; Graham R. Martin, AuteurWide variation in visual field configuration has been recorded among avian species and it is hypothesized that this variation is driven primarily by foraging ecology and predator detection. It has also been shown that visual field configurations[...]
Article
Graham R. Martin, Auteur ; Alex N. Banks, AuteurThroughout their evolution seabirds have not had to contend with the collision risk posed by discrete objects that extend into their flight space above the water surface. However, the recent introduction of offshore wind turbines has significant[...]
Article
Jennifer C. Cantlay, Auteur ; Steven J. Portugal, Auteur ; Graham R. Martin, AuteurDans Ibis (161(4) 2019)The visual fields of Blacksmith Lapwings Vanellus armatus show the characteristics of visual guided foragers that use precision pecking for prey capture – a binocular field of narrow width and limited vertical extent, with the projection of the [...]
Article
Simon Potier, Auteur ; Francesco Bonadonna, Auteur ; Graham R. Martin, Auteur ; Pierre-François Isard, Auteur ; Thomas Dulaurent, Auteur ; Marielle Mentek, Auteur ; Olivier Duriez, AuteurDans Ibis (160(1) 2018)Significant interspecific differences in avian vision occur, even in congeneric species, and these have been correlated with differences in the perceptual challenges associated with foraging. Although diurnal raptors are assumed to be mainly vis[...]
Article
Steven J. Portugal, Auteur ; Laura Sivess, Auteur ; Graham R. Martin, Auteur ; Patrick J. Butler, Auteur ; Craig R. White, AuteurDominant individuals within animal groups will frequently place themselves in the most beneficial position for maximal protection against predation. Higher perches are generally associated with reduced predation risk in birds, so we predicted th[...]
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Steven J. Portugal, Auteur ; Campbell P. Murn, Auteur ; Graham R. Martin, AuteurThe visual fields of the Aegypiinae vultures have been shown to be adapted primarily to meet two key perceptual challenges of their obligate carrion-feeding behaviour: scanning the ground and preventing the sun's image falling upon the retina. H[...]
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Graham R. Martin, Auteur ; Sarah Wanless, AuteurSignificant differences in avian visual fields are found between closely related species that differ in their foraging technique. We report marked differences in the visual fields of two auk species. In air, Common Guillemots Uria aalge have rel[...]
Article
Graham R. Martin, Auteur ; Sarah Wanless, AuteurSignificant differences in avian visual fields are found between closely related species that differ in their foraging technique. We report marked differences in the visual fields of two auk species. In air, Common Guillemots Uria aalge have rel[...]
Article
Graham R. Martin, Auteur ; Sarah Wanless, AuteurSignificant differences in avian visual fields are found between closely related species that differ in their foraging technique. We report marked differences in the visual fields of two auk species. In air, Common Guillemots Uria aalge have rel[...]
Article
Craig R. White, Auteur ; David Boertmann, Auteur ; David Grémillet, Auteur ; Patrick J. Butler, Auteur ; Jonathan A. Green, Auteur ; Graham R. Martin, AuteurArctic seas have warmed and sea ice has retreated. This has resulted in range contraction and population declines in some species, but it could potentially be a boon for others. Great Cormorants Phalacrocorax carbo have a partially wettable plum[...]
Article
Graham R. Martin, Auteur ; Raymond Mcneil, Auteur ; Luz Marina Rojas, AuteurIn birds, the position and extent of the region of binocular vision appears to be determined primarily by feeding ecology. Of prime importance is the degree to which vision is used for the precise control of bill position when foraging. Skimmers[...]
Article
Behavioural strategies of cormorants (Phalacrocoracidae) foraging under challenging light conditions
Craig R. White, Auteur ; Patrick J. Butler, Auteur ; David Grémillet, Auteur ; Graham R. Martin, AuteurDans Ibis (150 AUG 2008)Diving is indicative of foraging in cormorants (Phalacrocoracidae). We have investigated a range of parameters associated with diving in Great Cormorants Phalacrocorax carbo to provide insight into the bases of cormorant predatory strategies. We[...]
Article
B. John Hughes, Auteur ; Graham R. Martin, Auteur ; S. James Reynolds, AuteurDans Ibis (150 AUG 2008)The population of Sooty Terns Onychoprion fuscata breeding on Ascension Island in the Atlantic Ocean was monitored over 17 years (1990-2007). This period spanned the programme of feral Domestic Cat Felis silvestris catus eradication from the isl[...]
Article
Graham R. Martin, Auteur ; Steven J. Portugal, AuteurVariations in visual field topography among birds have been interpreted as adaptations to the specific perceptual challenges posed by the species' foraging ecology. To test this hypothesis we determined visual field topography in four bird speci[...]
Article
Piet J. Van Den Hout, Auteur ; Graham R. Martin, Auteur
Article
S. James Reynolds, Auteur ; Graham R. Martin, Auteur ; Colin P. Wearn, Auteur ; B. John Hughes, AuteurSub-lingual oral fistulas are a condition first reported in New Zealand Stitchbirds (Notiomystis cincta) in which a lesion develops on the periphery of the mandible in the oral cavity and a fistula develops through which the tongue protrudes. We[...]
Article
Graham R. Martin, AuteurSensory ecology investigates the information that underlies an animal's interactions with its environment. A sensory ecology approach provides a framework in which to investigate a wide range of topics in ornithology. This review provides a rang[...]
Article
Graham R. Martin, AuteurSensory ecology investigates the information that underlies an animal's interactions with its environment. A sensory ecology framework is used here to seek to assess why flying birds collide with prominent structures, such as power lines, fences[...]
Article
Graham R. Martin, Auteur ; Craig R. White, Auteur ; Patrick J. Butler, AuteurPredatory diving birds, such as cormorants (Phalacrocoracidae), have been generally regarded as visually guided pursuit foragers. However, due to their poor visual resolution underwater, it has recently been hypothesized that Great Cormorants do[...]
Article
Graham R. Martin, Auteur ; Nigel Jarrett, Auteur ; Murray Williams, AuteurBlue Ducks Hymenolaimus malacorhynchos (Anatidae), an IUCN Red Listed Endangered species, reside in headwaters of New Zealand rivers and feed primarily on aquatic invertebrates. However, whether such food items are detected by tactile or visual [...]
Article
Graham R. Martin, Auteur ; Steven J. Portugal, Auteur ; Campbell P. Murn, AuteurThe visual fields of vultures contain a small binocular region and large blind areas above, below and behind the head. Head positions typically adopted by foraging vultures suggest that these visual fields provide comprehensive visual coverage o[...]
Article
Graham R. Martin, AuteurAmong birds there are considerable interspecific differences in all aspects of visual fields. However, it is hypothesised that the topography of the frontal binocular portion of fields are of only three main types, and their principal functions [...]
Article
Esteban Fernandez-Juricic, Auteur ; Megan D. Gall, Auteur ; Tracy Dolan, Auteur ; Vanessa Tisdale, Auteur ; Graham R. Martin, AuteurIn birds, differences in the extent and position of the binocular visual field reflect adaptations to varying foraging strategies, and the extent of the lateral portion of the field may reflect anti-predator strategies. The goal of this study wa[...]
Article
Craig R. White, Auteur ; Graham R. Martin, Auteur ; Patrick J. Butler, AuteurWing-spreading of cormorants (Phalacrocoracidae) is a characteristic and enigmatic aspect of their behavioural repertoire. It has been suggested to have a range of functions including wing-drying, food-warming, and social signalling of foraging [...]
