ABSTRACT
Rock hind (Epinephelus adscensionis) and spotted moray (Gymnothorax moringa) are ubiquitous mesopredators that co-occur in the nearshore waters of Ascension Island in the South Atlantic Ocean, where they have significant cultural and subsistence value, but management of their non-commercial take is limited. This isolated volcanic system is home to high biomass and low species diversity, which poses two key questions: How can two mesopredators that perform similar ecological roles coexist? And if these two species are so ecologically similar, can they be managed using the same approach? Here, we combined acoustic telemetry, stomach content analysis, and stable isotope analysis to (i) explore space use and diet choices within and between these two species and (ii) to assess appropriate species-specific management options. Although rock hind had high residency and small calculated home ranges (0.0001-0.3114 km2), spotted moray exhibited shorter periods of residency (<3 months) before exiting the array. Vertical space use differed significantly across the 20-month tracking period, with individual differences in vertical space observed for both species. A hierarchical generalized additive model using 12-h averaged depth data identified that rock hind occurred lower in the water column than spotted moray, with both species occupying moderately deeper depths at night versus day (+1.6% relative depth). Spotted moray depth was also significantly predicted by lunar illumination. Aggregating samples by species and tissue type, Bayesian ecological niche modeling identified a 53.14%-54.15% and 78.02%-97.08% probability of niche overlap from fin clip and white muscle, respectively, whereas limited stomach content data indicated a preference for piscivorous prey. Variability in niche breadth between years suggests these species may exploit a range of prey items over time. These findings indicate that although these two species perform a similar ecological role by feeding on prey occupying the same trophic levels, subtle differences in movement behaviors between them suggest a one-rule-fits-all management approach is not likely the most effective option.
ABSTRACT
INTRODUCTION: This research assessed the preparedness of new graduate radiation therapists (NGRTs) for the clinical practice of planning. METHODS: A senior planner from each department and NGRTs who completed their degree in 2020 were surveyed after approximately 6 months of practice. Both were asked about NGRTs preparedness for practice and for feedback on the Bachelor of Radiation Therapy (BRT) planning curriculum. NGRTs were asked about body sites planned, how many plans they completed and planning techniques they had used. Senior planners were asked about their expectations of NGRTs in planning. RESULTS: New graduate radiation therapists frequently planned using three-dimensional conformal radiation therapy (3DCRT) or virtual simulation (VSim). Commonly planned body sites were those with palliative intent, radical breast and sites more frequently planned using 3DCRT. The departmental sign-off process sometimes prevented them from generating VMAT plans. They suggested more VMAT teaching could be included in the BRT. Senior planners expected NGRTs to be able to plan using 3DCRT and VMAT/IMRT. They suggested more clinical workflow teaching in the BRT planning curriculum. The majority of NGRTs and senior planners felt the BRT prepared the NGRTs for clinical practice. CONCLUSION: The undergraduate degree is preparing NGRTs for clinical practice in planning. 3DCRT and VSim planning techniques remain a core role of NGRTs and a large proportion of clinical workload. NGRTs utilised their VMAT/IMRT planning skills less often during their initial period of practice, despite being expected to possess these skills. This is a challenge for the undergraduate curriculum and New Zealand departments as the clinical use of VMAT/IMRT continues to increase.
