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Volumetric analysis of sensory brain areas indicates ontogenetic shifts in the relative importance of sensory systems in elasmobranchs
TLDR
The first evidence for shifts in the size of sensory brain areas in elasmobranchs is provided and it is suggested that vision is relatively more important than olfaction in juvenile elasmOBranchs and vice versa in adults.
Variation in Brain Organization and Cerebellar Foliation in Chondrichthyans: Sharks and Holocephalans
TLDR
Ecological correlations, with the relative development of different brain areas as well as the complexity of the cerebellar corpus, are supported by cluster analysis and are suggestive of a range of ‘cerebrotypes’.
A conserved pattern of brain scaling from sharks to primates
TLDR
A conserved pattern of brain scaling suggests that the fundamental brain plan that evolved in early vertebrates permits appropriate scaling in response to a range of factors, including phylogeny and ecology, where neural mass may be added and subtracted without compromising basic function.
Brain morphology in large pelagic fishes: a comparison between sharks and teleosts
TLDR
Cluster analysis performed on the sensorybrain areas data confirmed the differences in the composition of the sensory brain in sharks and teleosts and indicated that these two groups of pelagic fishes had evolved different sensory strategies to cope with the demands of life in the open ocean.
Cone photoreceptor oil droplet pigmentation is affected by ambient light intensity
TLDR
Calculations show that the reduced levels of oil droplet pigmentation in chickens reared in dim light would increase the sensitivity and spectral bandwidth of the outer segment significantly, which might explain why nocturnal animals have evolved oil droplets with low pigment densities or no pigmentation or have lost their oil Droplets altogether.
Colour vision and visual ecology of the blue-spotted maskray, Dasyatis kuhlii Müller & Henle, 1814
TLDR
Measurement of the spectral absorption of the rod and cone visual pigments of the blue-spotted maskray, Dasyatis kuhlii, using microspectrophotometry reveals that wavelengths below 380 nm do not reach the retina, indicating that D. kuhLii is relatively insensitive to ultraviolet radiation.
Eye Shape and Retinal Topography in Owls (Aves: Strigiformes)
TLDR
In conclusion, eye shape and retinal topography in owls vary among species and this variation is associated with different activity patterns and habitat preferences, thereby supporting similar observations in other vertebrates.
Multiple cone visual pigments and the potential for trichromatic colour vision in two species of elasmobranch
TLDR
The finding raises the possibility that some species are able to discriminate colour – a visual ability traditionally thought to be lacking in this vertebrate class – and it is evident that the visual ecology of elasmobranchs is far more complex than once thought.
Behavioural assessment of flicker fusion frequency in chicken Gallus gallus domesticus
TLDR
The FFFvalues demonstrated by this non-selected breed appear to be considerably higher than other behaviourally derived FFF values for similar stimuli reported for white and brown commercial laying hens, indicating that the domestication process might have influenced temporal resolution in chicken.
Retinal Ganglion Cell Distribution and Spatial Resolving Power in Elasmobranchs
TLDR
Variation in retinal ganglion cell topography appears to be related to the visual demands of different habitats and lifestyles, as well as the positioning of the eyes in the head.
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