Antarctic Toothfish in the South Orkney Islands: Using Otolith Chemistry to Test Current Hypotheses About Nursery Areas and Demographic Units.

We used otolith chemistry to test and complement current hypotheses regarding habitat use and connectivity between sub-populations in Area 48 of the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR). Sagittal otoliths from 45 fish sampled near the South Orkney Islands were analysed. Their elemental (Li, Na, Mg, Cr, Mn, Sr, Sn, and Ba relative to Ca) and isotopic (δO and δC) signatures were examined in both the nuclear and marginal regions, representing juvenile and adult stages.

Isotope geochemistry as a natural tag of fish in Patagonian freshwater environments: The invasive Chinook salmon case.

Patagonian aquatic environments have been invaded since the end of the last century by different species of salmonids. Knowing the natal origin and homing/straying rate of the salmonids in colonised environments is essential to understanding the dispersal mechanisms and developing management plans. In the last two decades, Chinook salmon Oncorhynchus tshawytscha showed the greatest natural dispersal capacity in Patagonia.

Episodic construction of the early Andean Cordillera unravelled by zircon petrochronology.

The subduction of oceanic plates beneath continental lithosphere is responsible for continental growth and recycling of oceanic crust, promoting the formation of Cordilleran arcs. However, the processes that control the evolution of these Cordilleran orogenic belts, particularly during their early stages of formation, have not been fully investigated. Here we use a multi-proxy geochemical approach, based on zircon petrochronology and whole-rock analyses, to assess the early evolution of the Andes, one of the most remarkable continental arcs in the world.

Enhancing the Prelicensure Clinical Learning Experience: A Student-Centered Learning Approach.

Background: Studies of the clinical learning environment document the importance of the student's clinical learning process.

Purpose: The aim of this study was to gather information on students' perceptions of their learning in the clinical environment.

Methods: A mixed-method strategy was used to explore nursing students' (N = 194) perceptions of their clinical learning experiences.