P. Fryer results 18
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Some invasive species threaten native species because they possess traits to which natives are evolutionarily naïve. In Australia, many predators have been severely impacted by the introduction of cane toads, which produce toxins that native species have never encountered. Torresian crows, however, have been observed consuming cane toads safely by avoiding their toxin glands, suggesting learned behavioural adaptations. To inve...
Prolonging survival in good health is a fundamental societal goal. However, the leading determinants of disability-free survival in healthy older people have not been well established. Data from ASPREE, a bi-national placebo-controlled trial of aspirin with 4.7 years median follow-up, was analysed. At enrolment, participants were healthy and without prior cardiovascular events, dementia or persistent physical disability. Disab...
Effects of individual variation in length, condition and run‐time on return rates of wild‐reared Atlantic salmon Salmo salar smoltsNARA Subscribed
Groups of wild‐reared Atlantic salmon Salmo salar smolts were captured during their seaward migration on a tributary of the River Conon, Scotland, U.K., from 1999 to 2014 and tagged with passive integrated transponders (PIT). Fish that subsequently returned to the river after growing at sea were recorded automatically by a PIT‐detector in a fish pass. Return rate was related directly to length and condition and inversely to da...
Does diurnal temperature variability affect growth in juvenile Atlantic salmon Salmo salar ?NARA Subscribed
This study investigated the effects of diurnal temperature variability (>7° C) on the growth of 1+ year Atlantic salmon Salmo salar . Experimental manipulation of water temperature was used to simulate: (1) constant and (2) naturally varying thermal regimes with similar daily mean values. Data from two replicates of four treatments (two thermal and two feeding regimes) were collected over 6 months corresponding to the main spr...
The effect of food intake and temperature on otolith macrostructure and microstructure was examined experimentally in Atlantic cod Gadus morhua . Daily increment formation was validated and otolith accretion rate and optical density quantified using image analysis. Two‐week periods of starvation had no discernable effect on otolith increment width or optical density, despite having negative effects on somatic growth. In contra...
The differentiation of Stegastes partitus populations using lapillar and sagittal otolith chemistryNARA Subscribed
The comparison of elemental concentrations of sagittal and lapillar otoliths from the same individuals of Stegastes partitus indicated significant differences for several elements. Sagittal otoliths were superior at differentiating individuals, yet the differentiation of individuals was further improved when the elemental concentrations of both otolith types were used in the same analysis.
Volcanoes of the southwestern extension of the active Mariana island arc: New swath‐mapping and geochemical studiesNARA Subscribed
Until recently it was thought that the volcanoes of the Mariana island arc of the western Pacific terminated at Tracey Seamount at ∼ 14°N immediately west of Guam. Sea floor mapping in 1995 shows a series of large volcanic seamounts stretching westward for nearly 300 km beyond that point. The morphology, spacing, and composition of those sampled are consistent with their having formed as a consequence of eruption of suprasubdu...
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