BEBERAPA PARAMETER BIOLOGI IKAN PARI Dasyatis kuhlii (FAMlLl DASYATIDAE) DI PERAIRAN LAUT JAWA

Electroreception in the euryhaline stingray, Dasyatis sabina.

This study quantified the electrosensitivity of a euryhaline elasmobranch, the Atlantic stingray (Dasyatis sabina) across a range of salinities. Specimens from a permanent freshwater (FW) population in the St Johns River system, FL, USA, were compared with stingrays from the tidally dynamic Indian River Lagoon in east Florida, USA. Behavioral responses of stingrays to prey-simulating electric s...

Costs of group-living for a normally solitary forager: effects of provisioning tourism on southern stingrays Dasyatis americana

Animals can perceive tourists as predators and will incur fitness costs should their predator-avoidance behaviours result in forgone resource acquisition. Not all wildlife, however, treat tourists as predators; animals can respond positively to tourists, especially when food is used as an attractant. We investigate the costs posed by novel grouping over a tourism-provisioned food resource in a ...

Phylogeography of the Indo-West Pacific maskrays (Dasyatidae, Neotrygon): a complex example of chondrichthyan radiation in the Cenozoic

Maskrays of the genus Neotrygon (Dasyatidae) have dispersed widely in the Indo-West Pacific being represented largely by an assemblage of narrow-ranging coastal endemics. Phylogenetic reconstruction methods reproduced nearly identical and statistically robust topologies supporting the monophyly of the genus Neotrygon within the family Dasyatidae, the genus Taeniura being consistently basal to N...

JaWa: Java with Assertions

Placebo. Historie, biologi og effekt

Since 1950 or so, placebos and their effect have generated a considerable interest in certain medical communities, in particular among psychiatrists and the designers of clinical trials, yet the only significant external study of this phenomenon to appear has been Howard Brody's doctoral investigation, Placebos and the philosophy ofmedicine, published in 1980. In 1997, however, three book-lengt...