Although both food availability and predation risk have been hypothesized to affect dolphin habitat use and group size, no study has measured both factors concurrently to determine their relative influences. From 1997 to 1999, we investigated the effect of food availability and tiger shark (Galeocerdo cuvier) predation risk on bottlenose dolphin (Tursiops aduncus) habitat use and group size in ...

Tunas (family Scombridae) and sharks in the family Lamnidae are highly convergent for features commonly related to efficient and high-performance (i.e. sustained, aerobic) swimming. High-performance swimming by fishes requires adaptations augmenting the delivery, transfer and utilization of O(2) by the red myotomal muscle (RM), which powers continuous swimming. Tuna swimming performance is enha...

This is the first known report on the skeletal and muscular systems, and the skin histology, of the pectoral fin of the rare planktivorous megamouth shark Megachasma pelagios. The pectoral fin is characterized by three features: 1) a large number of segments in the radial cartilages; 2) highly elastic pectoral fin skin; and 3) a vertically-rotated hinge joint at the pectoral fin base. These fea...

Vertebrates exhibit varied behavioural and physiological tactics to promote reproductive success. We examined mechanisms that could enable female loggerhead turtles to undertake nesting activities and maintain seasonal reproduction despite recent shark injuries of varying severity. We proposed that endocrinal mechanisms that regulate both a turtle's stress response and reproductive ability are ...

While scalable mechanisms for lookup of unique IDs in peer-to-peer (P2P) systems have been found, scalability remains an issue for P2P keyword search. Therefore, a new solution, the SHARK algorithm, has been proposed. Constructing a symmetric redundant hierarchy of nodes and information objects allows for efficient query routing toward small semantic clusters of peers. To show this algorithm’s ...

Macaronesia is formed by some of most isolated oceanic islands the Atlantic Ocean. This region typically heavily exploited fisheries; however, in recent years, marine wildlife tourism has become popular and a shark-diving industry emerged, potentially presenting an alternative for sustainable use sharks. Combining literature review with interviews dive operators conducting shark encounters Maca...

Indonesia is one of the world's most shark-catching countries. One fishery ports that has a by-product sharks Port Benoa. The purpose this study was to determine species and phylogenetic relationship from dominant fin samples landed at Benoa, Bali based on results morphological identification DNA barcoding techniques. conducted January February 2018 Pengawasan Sumberdaya Kelautan dan Perikanan ...

Nearly any social network application is based on the client-server paradigm. This has several serious drawback (data security, costs). This paper introduces the concept of Distributed Context Space which is a concept for loosely coupled (mobile) P2P semantic systems. Shark is a reference implementation of DCS and iSphere is a social network application based on Shark. This paper shows how Sema...

Large sharks (Carcharhinidae, Sphyrnidae), in their natural environment, were attracted to low-frequency (predominantly 20 to 60 cy/sec) pulsed sounds, but apparently not to higher frequency (400 to 600 cy/sec) pulsed sounds, or to low-frequency continuous sounds. The sharks apparently detected and oriented to the sounds in the acoustic far field.

We investigated the potential use of open coastal habitat over the continental shelf as a nursery area for the common thresher shark Alopias vulpinus. Seven juvenile threshers were tracked using acoustic telemetry to determine their movement patterns and nursery habitat in the Southern California Bight (SCB). Tracked sharks occupied waters over the continental shelf 87% of the time. These water...