Introduction: After nearly 40 years of close-proximity reconnaissance, the precise role of water in the hydrogeologic and potential habitability history of Mars still remains one of the most enigmatic puzzles facing planetary science. Significant progress has been made, however, and general scientific opinion is now inclined to regard the earlier Noachian period of Mars’ history as possessing t...

Knowledge about top predators’ trophic ecology is crucial for defining their role in ecosystems, understanding habitat preferences, characterizing life stage-specific feeding habits, and evaluating interaction with fisheries. In the northeastern Pacific, white sharks ( Carcharodon carcharias ) occupy coastal habitats during early stages, including Bahía Sebastián Vizcaíno (BSV) Mexico, which a ...

background: in anzali lagoon, there are some endemic and exotic fishes. the present study was conducted to compare the parasitic fauna of blicca bjeorkna , as an endemic fish and hemicul­ter leucisculus , as an introduced fish to the lagoon. methods: a parasitological investigation was done on 78 specimens of b. bjoerkna and 114 of h. leu­cisculus . the fishes were collected from august 2009 to...

The management of migratory taxa relies on the knowledge their movements. Among them, ontogenetic habitat shift, from nurseries to adult habitats, is a behavioural trait shared across marine allowing resource partitioning between life stages and reducing predation risk. As this movement consistent over time, characterizing its timing critical implement efficient plans, notably in coastal areas ...

Under global climate change, storm events are predicted to increase in strength and frequency. Although aquatic animals can be affected by acute natural disturbances, information on the immediate consequences of these weather systems behavioral ecology highly mobile predators remains limited. Here we examine spatial distributions, activity spaces, ecological change-points four large shark speci...

This paper summarizes records from longline fishing programs conducted in Hawai'i between 1959 and 1980. Data from 11 species of sharks (173 individual sharks) are reported and compared with worldwide records. Although much of the data is nearly 30 yr old, the information was never fully utilized and represents the following important findings. The relationship between clasper length and total ...

Externally and internally implanted sonic transmitters were used to track the movements of eight tiger sharks (Galeocerdo cuvier) ranging between 200 and 417 cm total length (TL), captured by hook-and-line on the south coast of Oahu, Hawaii, between 1993 and 1997. Attachment of the transmitters was facilitated by the fact that captured sharks exhibited tonic immobility when restrained and inver...

All professions, incl uding nursing, rest on a cultural base. Berger and Luckman argue that the sociology of knowledge concerns itself more with common sense tha n with theoret ical abstractions.l Everyone must exist within some kind of structure, some kind of ordered world, and so people create a "reality" for themselves about nurses and nursing which is based on things they "know, " regardl e...