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Allozyme heterozygosity, date of first feeding and life history strategy in Atlantic salmon (2003)

McCarthy, I. D. ; Sánchez, J. A. ; Blanco, G.

Oxford, UK : Blackwell Science Ltd

Journal of fish biology 62 (2003), S. 0

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ISSN: 1095-8649

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: The relations between allozyme heterozygosity, relative date of first feeding and life history strategy in juvenile Atlantic salmon Salmo salar were examined using eggs obtained from a 400 family cross (20 male × 20 female adult Atlantic salmon). Multilocus heterozygosity, through its positive associations with the timing of first feeding and growth rate, was correlated with life history strategy in juvenile Atlantic salmon, albeit under genotype × environmental (temperature, food availability) regulation. Under hatchery conditions, a 10 day difference was observed in the relative date of first feeding between early and late first feeding Atlantic salmon. Early first feeding Atlantic salmon exhibited a significantly higher mean heterozygosity, grew faster at ambient water temperature (April to November) and a significantly higher proportion adopted the early freshwater maturation (age 0+ years, male fish) or early migrant (age 1+ years, mainly female fish) strategies compared to late first feeding Atlantic salmon. Elevated water temperatures over the winter (December to April, 〉10·5° C) provided additional growth opportunity allowing previously mature male parr (mainly early first feeders) and lower modal group parr (mainly late first feeders) to adopt the early migrant strategy by the following spring.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1046/j.1095-8649.2003.00026.x

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Using High Pressure Coolant in the Drilling and Turning of Low Machinability Alloys (2000)

López de Lacalle, L. N. ; Pérez-Bilbatua, J. ; Sánchez, J. A. ; [et al.]

Springer

The international journal of advanced manufacturing technology 16 (2000), S. 85-91

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ISSN: 1433-3015

Keywords: Key words: Machining; Nickel; Titanium

Source: Springer Online Journal Archives 1860-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: The paper examines the results of machining tests carried out on two alloys commonly used in the aircraft industry, specifically, alphabeta type titanium alloy Ti6A14V and nickel-based superalloy of type 718. In view of their excellent mechanical properties and their resistance to a wide range of temperatures, these alloys are widely used in the manufacture of turbo-engine parts. They are extremely difficult to machine, however, for various reasons. The present aim is to consider how their drilling, turning, and milling could be made more productive.