Not all sharks are “swimming noses”: variation in olfactory bulb size in cartilaginous fishes

  title={Not all sharks are “swimming noses”: variation in olfactory bulb size in cartilaginous fishes},
  author={Kara E. Yopak and Thomas J. Lisney and Shaun P. Collin},
  journal={Brain Structure and Function},
Olfaction is a universal modality by which all animals sample chemical stimuli from their environment. In cartilaginous fishes, olfaction is critical for various survival tasks including localizing prey, avoiding predators, and chemosensory communication with conspecifics. Little is known, however, about interspecific variation in olfactory capability in these fishes, or whether the relative importance of olfaction in relation to other sensory systems varies with regard to ecological factors… 

Anatomical Specializations for Enhanced Olfactory Sensitivity in Kiwi, Apteryx mantelli

The anatomy of the kiwi Olfactory system supports an enhancement for olfactory sensitivities, which is undoubtedly associated with their unique nocturnal niche.

Convergence of Olfactory Inputs within the Central Nervous System of a Cartilaginous and a Bony Fish: An Anatomical Indicator of Olfactory Sensitivity

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Diversity in olfactory bulb size in birds reflects allometry, ecology, and phylogeny

The relative size of olfactory bulbs (OBs) is correlated with olfactory capabilities across vertebrates and is widely used to assess the relative importance of olfaction to a species’ ecology. In

Ontogenetic Shifts in the Number of Axons in the Olfactory Tract and Optic Nerve in Two Species of Deep-Sea Grenadier Fish (Gadiformes: Macrouridae: Coryphaenoides)

Comparing the olfactory and visual sensory inputs to the brain in Coryphaenoides armatus and C. profundicolus suggests that both species undergo an ontogenetic shift in sensory orientation, with olfaction becoming relatively more important than vision in larger animals.

Comparative Brain Morphology of the Greenland and Pacific Sleeper Sharks and its Functional Implications

Brain organization of S. microcephalus and S. pacificus was assessed in the context of up to 117 other cartilaginous fish species, using phylogenetic comparative techniques, and the region of the brain responsible for motor control is small and lacking foliation, a characteristic not yet described for any other large-bodied (>3 m) shark.

Anatomy of the olfactory bulb in Greenland shark Somniosus microcephalus (Bloch & Schneider, 1801)

In Greenland shark, the olfactory epithelium showed frequent mitosis and apoptosis highlighting the importance of this site in cell renewal, and a deeper understanding of the sensory biology of Greenland shark and of elasmobranchs in general is sought.



The role of olfaction throughout juvenile development: Functional adaptations in elasmobranchs

Seven elasmobranch species, a group known for their highly‐developed sense of smell, were examined for developmental changes in the number of olfactory lamellae, the size of the surface area of the

The Neuroecology of Cartilaginous Fishes: Sensory Strategies for Survival

  • S. Collin
  • Environmental Science, Biology
    Brain, Behavior and Evolution
  • 2012
Significant variation has been identified in the spatial and chromatic sampling of the photoreceptors in the eye, the surface area and the number of olfactory lamellae within the nasal cavity, the type and innervation of neuromasts of the lateral line system, the distribution of electroreceptive pores over the head, and the morphology of the inner ear.

Olfactory morphology and physiology of elasmobranchs

Results indicate parallels in olfactory physiology between elasmobranchs and teleost fishes, similar to that previously described in teleosts with neutral amino acids eliciting significantly greater responses than others.

Olfaction in fish

  • T. Hara
  • Biology
    Progress in Neurobiology
  • 1975

8 Sensory Physiolog

Morphological Indicators of Olfactory Capability in Wobbegong Sharks (Orectolobidae, Elasmobranchii)

Assessing relative olfactory sensitivity in four species of wobbegong shark could indicate relative differences in prey detection, intraspecific recognition and mate detection, and a phylogenetic comparative analysis between wob begongs and other elasmobranchs is presented.

The somatotopic organization of the olfactory bulb in elasmobranchs

Results support that the gross arrangement of the elasmobranch OB is somatotopic, an organization unique among fishes and most other vertebrates, and that Somatotopy could provide a preadaptation which facilitated the evolution of olfactory hemibulbs in these species.

Multisensory Integration in Shark Feeding Behavior

Three species from different ecological niches were investigated: benthic, suctionfeeding nurse sharks that hunt nocturnally for fish; ram-biting bonnetheads that scoop crustaceans off the bottom of seagrass beds; and ram-feeding blacktip sharks that rapidly chase down midwater teleost prey.

A review of the sensory biology of chimaeroid fishes (Chondrichthyes; Holocephali)

  • T. J. Lisney
  • Environmental Science
    Reviews in Fish Biology and Fisheries
  • 2010
A survey of the existing literature on the major senses in chimaeroids is provided in order to stimulate and identify areas for future research to help protect and management of these fascinating fishes.