title: Seasonal patterns of growth and nutrient status of the macroalga Adamsiella chauvinii (Rhodophyta) in soft sediment environments

authors: Kregting, Louise T.

subjects: Adamsiella chauvinii

abstract: The seasonal growth and nutrient status of the temperate subtidal macroalga Adamsiella chauvinii was determined at three soft sediment sites with different ranges of tidally-driven current speeds. A. chauvinii thalli exhibited maximum growth rates during the late summer (February) and no evidence of nitrogen limited growth in summer as often exhibited by macroalgae growing on hard substrata in temperate environments. We suggest that growth was maintained during the summer period, when seawater nitrogen concentrations were low, by localized sources of ammonium probably produced by sediments and fauna within the canopy. Growth rates were up to 50% lower at the site with the slowest water velocity throughout most of the experimental period. However a greater tissue nitrogen content of A. chauvinii thalli at the slow flow site did not support evidence for mass-transfer limitation. It is suggested that as a consequence of slow flow, sedimentation on blade surfaces reduced the amount of light available for photosynthesis and growth. Lower growth rates at the slow flow site reduced metabolic demand for nutrients resulting in accumulation of tissue nitrogen and phosphate.

text: Seasonal patterns of growth and nutrient status of the macroalga Adamsiella chauvinii (Rhodophyta) in soft sediment environments The seasonal growth and nutrient status of the temperate subtidal macroalga Adamsiella chauvinii was determined at three soft sediment sites with different ranges of tidally-driven current speeds. A. chauvinii thalli exhibited maximum growth rates during the late summer (February) and no evidence of nitrogen limited growth in summer as often exhibited by macroalgae growing on hard substrata in temperate environments. We suggest that growth was maintained during the summer period, when seawater nitrogen concentrations were low, by localized sources of ammonium probably produced by sediments and fauna within the canopy. Growth rates were up to 50% lower at the site with the slowest water velocity throughout most of the experimental period. However a greater tissue nitrogen content of A. chauvinii thalli at the slow flow site did not support evidence for mass-transfer limitation. It is suggested that as a consequence of slow flow, sedimentation on blade surfaces reduced the amount of light available for photosynthesis and growth. Lower growth rates at the slow flow site reduced metabolic demand for nutrients resulting in accumulation of tissue nitrogen and phosphate.

year: 2008

title: Re-evaluating fatigue measurement: A comparative study of subjective and objective fatigue tests

authors: König, Jemma Lynette

subjects: computer science

abstract: Fatigue poses a significant risk in hazardous industries, with forestry being a particularly under-examined domain. Despite the availability of subjective and objective fatigue tests, inconsistencies in their application, selection rationale, and performance remain largely unaddressed in existing literature. This paper investigates the utility and challenges of subjective and objective fatigue assessments through a review of existing literature and two case studies: one intensive longitudinal study with a single participant and another broader study involving 31 participants. Our results reveal strong internal consistency across subjective tests but variable outcomes for objective tests, raising questions about test sensitivity and context-specific reliability. We argue for clearer guidance on fatigue test selection and propose criteria to inform future research in complex, real-world settings like forestry.

text: Re-evaluating fatigue measurement: A comparative study of subjective and objective fatigue tests Fatigue poses a significant risk in hazardous industries, with forestry being a particularly under-examined domain. Despite the availability of subjective and objective fatigue tests, inconsistencies in their application, selection rationale, and performance remain largely unaddressed in existing literature. This paper investigates the utility and challenges of subjective and objective fatigue assessments through a review of existing literature and two case studies: one intensive longitudinal study with a single participant and another broader study involving 31 participants. Our results reveal strong internal consistency across subjective tests but variable outcomes for objective tests, raising questions about test sensitivity and context-specific reliability. We argue for clearer guidance on fatigue test selection and propose criteria to inform future research in complex, real-world settings like forestry.

year: 2025

title: Examining the effects of Ki-o-Rahi on the development of fundamental movement skills by children in Aotearoa New Zealand

authors: Daveta, Wiliame

subjects: fundamental movement skills

abstract: Children with poor fundamental movement skills might have challenges when engaging in activities that require specific skills to help them perform effectively. Development of those skills through targeted training has the potential to build the foundation for fundamental movement skills. This study examined whether Ki-o-Rahi can enhance learning fundamental movement skills (FMS) and cognitive and social skills in Aotearoa New Zealand children. A quasi-experimental pre-post design was conducted over 8 weeks with 86 primary school children from five separate classes that were allocated to treatment conditions via cluster sampling: two classes to the intervention group, two to the control group, and one to the legend-only control group. The intervention group learned the legend and played Ki-o-Rahi over 8 sessions, whereas the control groups continued with their regular physical activities, but only one of the control groups learned the legend. FMS were measured using the Test of Gross Motor Development—Third Edition (TGMD-3) and the Motor Assessment Battery for Children (MABC-2). Cognitive skills were measured using the Head-Toes-Knees-Shoulders test (HTKS), forward and backward digit span, and forward and backward corsi block. Researchers measured social skills using the Early Childhood Social Relationship with Peers (ECSRP) teacher-proxy questionnaire. The results demonstrated that the intervention and control group gained improvements in the FMS and social skills but not cognitive skills. The legend-only group showed no significant changes. The findings suggest that Ki-o-rahi can contribute to developing FMS, cognitive, and social skills in Aotearoa New Zealand children. Future research should consider extending the duration of the study to assess long-term effects and include a larger cohort of Pacific or Māori children to explore potential benefits of Ki-o-Rahi in greater depth.

text: Examining the effects of Ki-o-Rahi on the development of fundamental movement skills by children in Aotearoa New Zealand Children with poor fundamental movement skills might have challenges when engaging in activities that require specific skills to help them perform effectively. Development of those skills through targeted training has the potential to build the foundation for fundamental movement skills. This study examined whether Ki-o-Rahi can enhance learning fundamental movement skills (FMS) and cognitive and social skills in Aotearoa New Zealand children. A quasi-experimental pre-post design was conducted over 8 weeks with 86 primary school children from five separate classes that were allocated to treatment conditions via cluster sampling: two classes to the intervention group, two to the control group, and one to the legend-only control group. The intervention group learned the legend and played Ki-o-Rahi over 8 sessions, whereas the control groups continued with their regular physical activities, but only one of the control groups learned the legend. FMS were measured using the Test of Gross Motor Development—Third Edition (TGMD-3) and the Motor Assessment Battery for Children (MABC-2). Cognitive skills were measured using the Head-Toes-Knees-Shoulders test (HTKS), forward and backward digit span, and forward and backward corsi block. Researchers measured social skills using the Early Childhood Social Relationship with Peers (ECSRP) teacher-proxy questionnaire. The results demonstrated that the intervention and control group gained improvements in the FMS and social skills but not cognitive skills. The legend-only group showed no significant changes. The findings suggest that Ki-o-rahi can contribute to developing FMS, cognitive, and social skills in Aotearoa New Zealand children. Future research should consider extending the duration of the study to assess long-term effects and include a larger cohort of Pacific or Māori children to explore potential benefits of Ki-o-Rahi in greater depth.

year: 2024