title: The servant identity: Influences on the cognition and behavior of servant leaders

authors: Sun, Peter Yih-Tong

subjects: identity

abstract: This paper approaches the study of servant leadership by concentrating on the identity of servant leaders. An identity is important to one's sense of self and it influences the way a leader cognitively processes socially relevant information and exercises a particular leadership behavior in response to a situation. Unlike existing studies, which typically approach servant leadership as one of a number of possible leadership styles, and which merely describe its characteristics, this paper serves to explain the basis for individuals enacting this mode of leadership. This paper defines and elaborates on the servant identity by showing the psychological factors constituting it. Taking a socio-cognitive approach, the paper offers a theoretical framework for the servant identity. The framework encompasses the cognitive and behavioral disposition of leaders with servant identity and the organizational contexts that influence it. This new angle on servant leadership opens avenues for future research and practice.

text: The servant identity: Influences on the cognition and behavior of servant leaders This paper approaches the study of servant leadership by concentrating on the identity of servant leaders. An identity is important to one's sense of self and it influences the way a leader cognitively processes socially relevant information and exercises a particular leadership behavior in response to a situation. Unlike existing studies, which typically approach servant leadership as one of a number of possible leadership styles, and which merely describe its characteristics, this paper serves to explain the basis for individuals enacting this mode of leadership. This paper defines and elaborates on the servant identity by showing the psychological factors constituting it. Taking a socio-cognitive approach, the paper offers a theoretical framework for the servant identity. The framework encompasses the cognitive and behavioral disposition of leaders with servant identity and the organizational contexts that influence it. This new angle on servant leadership opens avenues for future research and practice.

year: 2013

title: Effects of a pre-flower phloem girdle on root pressure and partitioning of carbohydrate in Actinidia chinensis var. deliciosa 'Hayward'

authors: Haisman, Nicola Ann

subjects: kiwifruit

abstract: The objective of this research is to understand the impacts of applying a pre-flower trunk girdle to the kiwifruit cultivar ‘Hayward’ (Actinidia chinensis var. deliciosa).  The pre-flower girdle is a recent addition to the management of ‘Hayward’ kiwifruit orchards since it was discovered that it can reduce flower budrot. However, the effects of a trunk girdle in early spring on the partitioning of resources through the vine and the impacts on vine growth are unknown. 
Two approaches were used to address the objective. The first approach was to  use mature ‘Hayward’ vines at the Plant and Food Research Orchard, Te Puke in the Bay of Plenty.  The aims were to determine if xylem mobile sugars are important in the development of spring root pressure, and to define the impacts of a pre-flower girdle on root pressure, carbohydrate partitioning and storage, and vine phenology within the vine.  The second section of research used the detection of Bremmstrahlung radiation to trace the in vivo movement of radiolabelled photosynthate through ‘Hayward’ scions recently grafted onto Bruno rootstocks. The aim was to understand how stem girdling effects the movement of carbohydrate between source and sink tissues of young developing vines. 
Key results of this research were that the refilling of xylem vessels and the establishment of hydrostatic pressure in early spring occurs gradually from the roots up the trunk of the vine.  Fructose in the fine roots was identified as a key carbohydrate in the generation of the hydrostatic pressure required to refill xylem conduits after winter dormancy.  After a pre-flower trunk phloem girdle was applied there was a loss of xylem pressure that lasted for two weeks. The cause has not been resolved though results from this study suggest a relationship with loss of phloem flow, or cavitation induced air embolisms in the xylem preventing xylem pressure recovery.  
Leaves from girdled vines exported less carbohydrate than non-girdled vines which suggests a delayed transition to an autotrophic status.  Root and trunk carbohydrates showed little short-term effect of the pre-flower girdle.  However, there was a location effect seen with the trunk bark carbohydrates that suggest the utilisation of ‘local’ reserves is exploited in preference to long-distant transport of reserves.  There was no detectable short-term impacts of the pre-flower girdle on phenology. 
Further research is proposed to understand the long-term impacts of a pre-flower girdle on root pressure, carbohydrate storage and the development of seasonal organs.

text: Effects of a pre-flower phloem girdle on root pressure and partitioning of carbohydrate in Actinidia chinensis var. deliciosa 'Hayward' The objective of this research is to understand the impacts of applying a pre-flower trunk girdle to the kiwifruit cultivar ‘Hayward’ (Actinidia chinensis var. deliciosa).  The pre-flower girdle is a recent addition to the management of ‘Hayward’ kiwifruit orchards since it was discovered that it can reduce flower budrot. However, the effects of a trunk girdle in early spring on the partitioning of resources through the vine and the impacts on vine growth are unknown. 
Two approaches were used to address the objective. The first approach was to  use mature ‘Hayward’ vines at the Plant and Food Research Orchard, Te Puke in the Bay of Plenty.  The aims were to determine if xylem mobile sugars are important in the development of spring root pressure, and to define the impacts of a pre-flower girdle on root pressure, carbohydrate partitioning and storage, and vine phenology within the vine.  The second section of research used the detection of Bremmstrahlung radiation to trace the in vivo movement of radiolabelled photosynthate through ‘Hayward’ scions recently grafted onto Bruno rootstocks. The aim was to understand how stem girdling effects the movement of carbohydrate between source and sink tissues of young developing vines. 
Key results of this research were that the refilling of xylem vessels and the establishment of hydrostatic pressure in early spring occurs gradually from the roots up the trunk of the vine.  Fructose in the fine roots was identified as a key carbohydrate in the generation of the hydrostatic pressure required to refill xylem conduits after winter dormancy.  After a pre-flower trunk phloem girdle was applied there was a loss of xylem pressure that lasted for two weeks. The cause has not been resolved though results from this study suggest a relationship with loss of phloem flow, or cavitation induced air embolisms in the xylem preventing xylem pressure recovery.  
Leaves from girdled vines exported less carbohydrate than non-girdled vines which suggests a delayed transition to an autotrophic status.  Root and trunk carbohydrates showed little short-term effect of the pre-flower girdle.  However, there was a location effect seen with the trunk bark carbohydrates that suggest the utilisation of ‘local’ reserves is exploited in preference to long-distant transport of reserves.  There was no detectable short-term impacts of the pre-flower girdle on phenology. 
Further research is proposed to understand the long-term impacts of a pre-flower girdle on root pressure, carbohydrate storage and the development of seasonal organs.

year: 2019

title: Ecological Survey of Tauranga Harbour

authors: Ellis, Joanne I.

abstract: This report summarises the results of biological and physical data collected from a broad scale intertidal survey of Tauranga Harbour conducted between December 2011 and February 2012. The survey was designed to understand more fully the role of various anthropogenic stressors on the ecology of the harbour. The research was conducted as part of the Manaaki Taha Moana (MTM) programme. The wider research project aims to restore and enhance coastal ecosystems and their services of importance to iwi/hapū, by working with iwi to improve knowledge of these ecosystems and the degradation processes that affect them.
In this report we assess the health of macrofaunal benthic communities (bottom-dwelling animals) as well as trends in sediments, nutrients and contaminants. The results indicate that the sites identified as most impacted were generally located in the upper reaches of estuaries in some of the locations least exposed to wind, waves and currents. In addition, the biological community composition characterising sites with different sediment textures, nutrient and contaminant loadings were found to vary. Sediments within Tauranga Harbour were predominantly sandy with the percentage of mud within a similar range as measured for other New Zealand estuaries. The exceptions included Te Puna Estuary and Apata Estuary, which experience higher rates of sedimentation.
Heavy metal contamination in sediments is often highly correlated with the percentage of mud content due to the adherence of chemicals to fine sediments and/or organic content. It is, therefore, not surprising that heavy metal concentrations were also highest in the depositional inner areas of the harbour, such as Te Puna Estuary. The heavy metal contaminant levels within Tauranga were well below relevant guideline thresholds and lower than concentrations measured in many other estuaries in New Zealand and overseas. Although the three metals recorded were found to be highly correlated, zinc levels tended to be closer to guideline thresholds for possible biological effects.
Sediment nutrient concentrations in the harbour tended to decline with distance from the inner harbour and associated rivers. Te Puna Estuary showed comparatively high nitrogen and phosphorus loadings. Comparison of sediment nutrient concentrations with other New Zealand estuaries indicates that the Tauranga Harbour sits within a range typical for slightly to moderately enriched estuaries. Although total phosphorus was low compared with other estuaries, total N:P ratios suggest Tauranga Harbour is still limited by nitrogen.
We developed a BHM using statistical ordination techniques to identify key stressors affecting the ‘health’ of macrofaunal communities. Sediments, nutrients and heavy metals were identified as key ‘stressors’, i.e. variables affecting the ecology of the harbour. Therefore, three multivariate models were developed based on the variability in community composition using canonical analysis of principal coordinates (CAP). The ecological assemblages generally reflected gradients of stress or pollution very well. However, the CAP models for sedimentation and contamination performed best. In general, the multivariate models were found to be more sensitive to changing ecological health than simple univariate measures (abundance, species diversity, evenness and Shannon-Wiener diversity). This finding has also been reported in the literature where univariate measures based on abundance and diversity were only able to detect significant differences between the most and least disturbed sites, but were not able to differentiate between smaller relative changes in ecological health. Hence univariate measures were less sensitive to smaller degradative changes in community composition. For Tauranga Harbour, ordination models based on community composition appear to be a more sensitive measure of ‘health’ along an ecological gradient and should enable long term degradative change from multiple disturbances to be assessed. This BHM approach can be used as a management or monitoring tool where sites are repeatedly sampled over time and tracked to determine whether the communities are moving towards a more healthy or unhealthy state.
The key species at ‘healthy’ and ‘impacted’ sites as determined from the CAP models were also identified. Species at ‘impacted’ sites can be considered to be tolerant to the stressor (i.e. sediment, nutrients or contaminants), while species with high abundances at only ‘healthy’ sites are sensitive to increasing stressors. We developed species response models for 20 taxa. Although the type of response differed by taxa and stressor, variation in the abundance of most of the taxa modelled was most likely to be better predicted by sedimentation. Unimodal responses were almost always observed in response to nutrients, while declines or skewed unimodal responses were most often observed in response to sedimentation and metals.
The results from this study are consistent with models of macrofaunal species occurrence with respect to sediment mud content developed across a range of New Zealand estuaries by Thrush et al. (2003). Within this report we extend this analysis by also developing models of macrofaunal species occurrence with respect to nutrient and contaminants loadings. Ultimately such statistical models provide a tool to forecast the distribution and abundance of species associated with habitat changes in sediments, nutrients and metals.
In conclusion, Tauranga Harbour is a predominantly sandy harbour with slight to moderate enrichment and low levels of heavy metal contaminants. Sites identified as most impacted by elevated sediments, heavy metal contaminants and nutrients were generally located in the upper reaches of estuaries in some of the least exposed locations. To some extent, this reflects the natural progression of an estuary from land to sea; however, the rates of accumulation of sediments and nutrients have been accelerated as a result of anthropogenic land-based activities. Sediments and contaminants were found to explain the largest variance in benthic communities. Species response models suggest that taxa were either sensitive to elevated sediments, nutrients loading or contamination at all levels, or sensitive to these stressors beyond a critical point.

text: Ecological Survey of Tauranga Harbour This report summarises the results of biological and physical data collected from a broad scale intertidal survey of Tauranga Harbour conducted between December 2011 and February 2012. The survey was designed to understand more fully the role of various anthropogenic stressors on the ecology of the harbour. The research was conducted as part of the Manaaki Taha Moana (MTM) programme. The wider research project aims to restore and enhance coastal ecosystems and their services of importance to iwi/hapū, by working with iwi to improve knowledge of these ecosystems and the degradation processes that affect them.
In this report we assess the health of macrofaunal benthic communities (bottom-dwelling animals) as well as trends in sediments, nutrients and contaminants. The results indicate that the sites identified as most impacted were generally located in the upper reaches of estuaries in some of the locations least exposed to wind, waves and currents. In addition, the biological community composition characterising sites with different sediment textures, nutrient and contaminant loadings were found to vary. Sediments within Tauranga Harbour were predominantly sandy with the percentage of mud within a similar range as measured for other New Zealand estuaries. The exceptions included Te Puna Estuary and Apata Estuary, which experience higher rates of sedimentation.
Heavy metal contamination in sediments is often highly correlated with the percentage of mud content due to the adherence of chemicals to fine sediments and/or organic content. It is, therefore, not surprising that heavy metal concentrations were also highest in the depositional inner areas of the harbour, such as Te Puna Estuary. The heavy metal contaminant levels within Tauranga were well below relevant guideline thresholds and lower than concentrations measured in many other estuaries in New Zealand and overseas. Although the three metals recorded were found to be highly correlated, zinc levels tended to be closer to guideline thresholds for possible biological effects.
Sediment nutrient concentrations in the harbour tended to decline with distance from the inner harbour and associated rivers. Te Puna Estuary showed comparatively high nitrogen and phosphorus loadings. Comparison of sediment nutrient concentrations with other New Zealand estuaries indicates that the Tauranga Harbour sits within a range typical for slightly to moderately enriched estuaries. Although total phosphorus was low compared with other estuaries, total N:P ratios suggest Tauranga Harbour is still limited by nitrogen.
We developed a BHM using statistical ordination techniques to identify key stressors affecting the ‘health’ of macrofaunal communities. Sediments, nutrients and heavy metals were identified as key ‘stressors’, i.e. variables affecting the ecology of the harbour. Therefore, three multivariate models were developed based on the variability in community composition using canonical analysis of principal coordinates (CAP). The ecological assemblages generally reflected gradients of stress or pollution very well. However, the CAP models for sedimentation and contamination performed best. In general, the multivariate models were found to be more sensitive to changing ecological health than simple univariate measures (abundance, species diversity, evenness and Shannon-Wiener diversity). This finding has also been reported in the literature where univariate measures based on abundance and diversity were only able to detect significant differences between the most and least disturbed sites, but were not able to differentiate between smaller relative changes in ecological health. Hence univariate measures were less sensitive to smaller degradative changes in community composition. For Tauranga Harbour, ordination models based on community composition appear to be a more sensitive measure of ‘health’ along an ecological gradient and should enable long term degradative change from multiple disturbances to be assessed. This BHM approach can be used as a management or monitoring tool where sites are repeatedly sampled over time and tracked to determine whether the communities are moving towards a more healthy or unhealthy state.
The key species at ‘healthy’ and ‘impacted’ sites as determined from the CAP models were also identified. Species at ‘impacted’ sites can be considered to be tolerant to the stressor (i.e. sediment, nutrients or contaminants), while species with high abundances at only ‘healthy’ sites are sensitive to increasing stressors. We developed species response models for 20 taxa. Although the type of response differed by taxa and stressor, variation in the abundance of most of the taxa modelled was most likely to be better predicted by sedimentation. Unimodal responses were almost always observed in response to nutrients, while declines or skewed unimodal responses were most often observed in response to sedimentation and metals.
The results from this study are consistent with models of macrofaunal species occurrence with respect to sediment mud content developed across a range of New Zealand estuaries by Thrush et al. (2003). Within this report we extend this analysis by also developing models of macrofaunal species occurrence with respect to nutrient and contaminants loadings. Ultimately such statistical models provide a tool to forecast the distribution and abundance of species associated with habitat changes in sediments, nutrients and metals.
In conclusion, Tauranga Harbour is a predominantly sandy harbour with slight to moderate enrichment and low levels of heavy metal contaminants. Sites identified as most impacted by elevated sediments, heavy metal contaminants and nutrients were generally located in the upper reaches of estuaries in some of the least exposed locations. To some extent, this reflects the natural progression of an estuary from land to sea; however, the rates of accumulation of sediments and nutrients have been accelerated as a result of anthropogenic land-based activities. Sediments and contaminants were found to explain the largest variance in benthic communities. Species response models suggest that taxa were either sensitive to elevated sediments, nutrients loading or contamination at all levels, or sensitive to these stressors beyond a critical point.

year: 2017