Scientific Papers

Vision in sharks and rays: Opsin diversity and colour vision

Vision in sharks and rays: Opsin diversity and colour vision

Vision in sharks and rays: Opsin diversity and colour vision Nathan S.Hart ABSTRACT: The visual sense of elasmobranch fishes is poorly studied compared to their bony cousins, the teleosts. Nevertheless, the elasmobranch eye features numerous specialisations that have no doubt facilitated the diversification and evolutionary success of this fascinating taxon. In this review, I highlight

Occurrence of the Young Thresher Shark Alopias superciliosus in the Northeastern Mediterranean Sea

Occurrence of the Young Thresher Shark Alopias superciliosus in the Northeastern Mediterranean Sea

Occurrence of the Young Thresher Shark Alopias superciliosus Lowe, 1841 (Lamniformes: Alopiidae) in the Northeastern Mediterranean Sea Deniz AYAS, Hasan Deniz AKBORA, Burak Ali ÇİÇEK ABSTRACT: The Bigeye Thresher Shark Alopias superciliosus Lowe, 1841 is one of the largest shark species found in the Pacific, Atlantic, and Indian oceans. They also have started to be

Growth trajectories of prenatal embryos of the frilled shark

Growth trajectories of prenatal embryos of the frilled shark

Growth trajectories of prenatal embryos of the deep sea shark Chlamydoselachus anguineus (Chondrichthyes) A. López‐Romero Faviel, Klimpfinger Claudia, Tanaka Sho, Kriwet Jürgen ABSTRACT: Chlamydoselachus anguineus, Garman 1884, commonly called the frilled shark, is a deep sea shark species occurring up to depths of 1300 m. It is assumed to represent an ancient morphotype of sharks (e.g.,

Male mate choice in the spot-tail shark Carcharhinus sorrah

Male mate choice in the spot-tail shark Carcharhinus sorrah

Male mate choice in the spot-tail shark Carcharhinus sorrah: are males choosy or opportunistic? Dareen Almojil ABSTRACT: Male mate choice has been documented in different taxa including insects, lizards, fish, birds and mammals. However, in sharks, male mate choice is not clearly reported but field observations suggest that it is probable. In this study, I

Near equal compressibility of liver oil and seawater minimises buoyancy changes in deep-sea sharks and chimaeras

Near equal compressibility of liver oil and seawater minimises buoyancy changes in deep-sea sharks and chimaeras

Near equal compressibility of liver oil and seawater minimises buoyancy changes in deep-sea sharks and chimaeras Imants G. Priede, Rhoderick W. Burgass, Manolis Mandalakis, Apostolos Spyros, Petros Gikas, Finlay Burns, Jim Drewery ABSTRACT: Whereas upper ocean pelagic sharks are negatively buoyant and must swim continuously to generate lift from their fins, deep-sea sharks float or

First record of the marbled ray from Greece

First record of the marbled ray from Greece

First record of the marbled ray, Dasyatis marmorata (Elasmobranchii: Dasyatidae), from Greece (central Aegean Sea) Archontia Chatzispyrou, Chrysoula Gubili, Maria Laiaki, Danai Mantopoulou-Palouka, Stefanos Kavadas ABSTRACT: Currently, seven dasyatid species have been described in the Mediterranean Sea: Bathytoshia lata, Dasyatis marmorata, Dasyatis pastinaca, Dasyatis tortonesei, Himantura uarnak, Pteroplatytrygon violacea and Taeniura grabata. Papaconstantinou (2014) listed

Comparative anatomy of the clasper of catsharks

Comparative anatomy of the clasper of catsharks

Comparative anatomy of the clasper of catsharks and its phylogenetic implications (Chondrichthyes: Carcharhiniformes: Scyliorhinidae) Karla D. A. Soares ABSTRACT: The presence of claspers is one of the main characteristics of the cartilaginous fishes, but its variations across taxa have received limited use in shark systematics and have generally been neglected in descriptions of species. Clasper

New insights into the migration patterns of the scalloped hammerhead shark

New insights into the migration patterns of the scalloped hammerhead shark

New insights into the migration patterns of the scalloped hammerhead shark Sphyrna lewini based on vertebral microchemistry Claire Coiraton, Felipe Amezcua , James T. Ketchum ABSTRACT: The scalloped hammerhead shark Sphyrna lewini is a migratory species that exhibits complex patterns of spatial organization associated with the use of both coastal and oceanic habitats. Information about

Natural tags identify nursery origin of a coastal elasmobranch Carcharhinus leucas

Natural tags identify nursery origin of a coastal elasmobranch Carcharhinus leucas

Natural tags identify nursery origin of a coastal elasmobranch Carcharhinus leucas Thomas C. TinHan, Shannon J. O’Leary, David S. Portnoy, Jay R. Rooker, Carey G. Gelpi, R. J. David Wells ABSTRACT: Traditional methods for evaluating the importance of elasmobranch nursery habitats have focused on estimating densities or abundances of juveniles within individual nurseries; however, rates

Estimates of Age and Growth of Whale Sharks

Estimates of Age and Growth of Whale Sharks

Annual Bands in Vertebrae Validated by Bomb Radiocarbon Assays Provide Estimates of Age and Growth of Whale Sharks Joyce J. L. Ong, Mark G. Meekan, Hua Hsun Hsu, L. Paul Fanning, Steven E. Campana ABSTRACT: Conservation and management strategies for endangered and threatened species require accurate estimates of demographic parameters such as age and growth.

Common thresher shark movement

Common thresher shark movement

Common thresher shark Alopias vulpinus movement: Bayesian inference on a data-limited species Michael J. Kinney, Dovi Kacev, Tim Sippel, Heidi Dewar, Tomoharu Eguchi ABSTRACT: Within the fields of biology and ecology, animal movement is arguably one of the most basic, and yet, often one of the most difficult areas of study. Where and why animals

Long-term monitoring provides insight into estuarine top predator resilience following an extreme weather event

Long-term monitoring provides insight into estuarine top predator resilience following an extreme weather event

Long-term monitoring provides insight into estuarine top predator (Carcharhinus leucas) resilience following an extreme weather event Philip Matich, Bradley A. Strickland, Michael R. Heithaus ABSTRACT: Chronic environmental change threatens biodiversity, but acute disturbance events present more rapid and immediate threats. In 2010, a cold snap across south Florida had wide-ranging impacts, including negative effects on

Trophic resources and mercury exposure of two silvertip shark populations

Trophic resources and mercury exposure of two silvertip shark populations

Trophic resources and mercury exposure of two silvertip shark populations in the Northeast Pacific Ocean Gaël Le Croizier, Anne Lorrain, Gauthier Schaal, James Ketchum, Mauricio Hoyos-Padilla, Lucien Besnard, Jean-Marie Munaron, François Le Loc’h, David Point ABSTRACT: Worldwide shark populations have experienced rapid declines over the last decades, mainly due to overfishing. Marine protected areas (MPAs)

Retinal topography and spectral sensitivity of the Port Jackson shark

Retinal topography and spectral sensitivity of the Port Jackson shark

Retinal topography and spectral sensitivity of the Port Jackson shark (Heterodontus portusjacksoni) Lauren R. Peel, Shaun P. Collin, Nathan S. Hart ABSTRACT: In this study, we investigated the visual system of the Port Jackson shark Heterodontus portusjacksoni, a shallow‐dwelling benthic species and generalist predator endemic to the temperate coastal waters around southern Australia. Measurements of

How Sharks and Shark–Human Interactions are Reported in Major Australian Newspapers

How Sharks and Shark–Human Interactions are Reported in Major Australian Newspapers

How Sharks and Shark–Human Interactions are Reported in Major Australian Newspapers Nigel Hardiman, Shelley Burgin, Jia Shao ABSTRACT: Few phrases evoke more negative emotion, or generate more media coverage, than ‘shark attack’ despite the few deaths that have been attributed to shark bite. Typically, tabloids are considered to provide more sensational coverage than broadsheets. We