title: Intraspecific trait variation can weaken interspecific trait correlations when assessing the whole-plant economic spectrum

authors: Laughlin, Daniel C.

subjects: fine root tissue density

abstract: The worldwide plant economic spectrum hypothesis predicts that leaf, stem, and root traits are correlated across vascular plant species because carbon gain depends on leaves being adequately supplied with water and nutrients, and because construction of each organ involves a trade-off between performance and persistence. Despite its logical and intuitive appeal, this hypothesis has received mixed empirical support. If traits within species diverge in their responses to an environmental gradient, then interspecific trait correlations could be weakened when measured in natural ecosystems. To test this prediction, we measured relative growth rates (RGR) and seven functional traits that have been shown to be related to fluxes of water, nutrients, and carbon across 56 functionally diverse tree species on (1) juveniles in a controlled environment, (2) juveniles in forest understories, and (3) mature trees in forests. Leaf, stem, and fine root traits of juveniles grown in a controlled environment were closely correlated with each other, and with RGR. Remarkably, the seven leaf, stem, and fine root tissue traits spanned a single dimension of variation when measured in the controlled environment. Forest-grown juveniles expressed lower leaf mass per area, but higher wood and fine root tissue density, than greenhouse-grown juveniles. Traits and growth rates were decoupled in forest-grown juveniles and mature trees. Our results indicate that constraints exist on the covariation, not just the variation, among vegetative plant organs; however, divergent responses of traits within species to environmental gradients can mask interspecific trait correlations in natural environments. Correlations among organs and relationships between traits and RGR were strong when plants were compared in a standardized environment. Our results may reconcile the discrepancies seen among studies, by showing that if traits and growth rates of species are compared across varied environments, then the interorgan trait correlations observed in controlled conditions can weaken or disappear.

text: Intraspecific trait variation can weaken interspecific trait correlations when assessing the whole-plant economic spectrum The worldwide plant economic spectrum hypothesis predicts that leaf, stem, and root traits are correlated across vascular plant species because carbon gain depends on leaves being adequately supplied with water and nutrients, and because construction of each organ involves a trade-off between performance and persistence. Despite its logical and intuitive appeal, this hypothesis has received mixed empirical support. If traits within species diverge in their responses to an environmental gradient, then interspecific trait correlations could be weakened when measured in natural ecosystems. To test this prediction, we measured relative growth rates (RGR) and seven functional traits that have been shown to be related to fluxes of water, nutrients, and carbon across 56 functionally diverse tree species on (1) juveniles in a controlled environment, (2) juveniles in forest understories, and (3) mature trees in forests. Leaf, stem, and fine root traits of juveniles grown in a controlled environment were closely correlated with each other, and with RGR. Remarkably, the seven leaf, stem, and fine root tissue traits spanned a single dimension of variation when measured in the controlled environment. Forest-grown juveniles expressed lower leaf mass per area, but higher wood and fine root tissue density, than greenhouse-grown juveniles. Traits and growth rates were decoupled in forest-grown juveniles and mature trees. Our results indicate that constraints exist on the covariation, not just the variation, among vegetative plant organs; however, divergent responses of traits within species to environmental gradients can mask interspecific trait correlations in natural environments. Correlations among organs and relationships between traits and RGR were strong when plants were compared in a standardized environment. Our results may reconcile the discrepancies seen among studies, by showing that if traits and growth rates of species are compared across varied environments, then the interorgan trait correlations observed in controlled conditions can weaken or disappear.

year: 2017

title: A virtual cocktail party: Supporting informal social interactions in a virtual conference

authors: Rogers, Bill

abstract: Whilst the primary purpose of conferences is work — formal exchange and sharing of information — they almost always also include elements of play: Informal social and entertainment elements, such as receptions, dinners, and tourism activities. These activities also provide the opportunity for ‘serious’ discussions, meeting people, and networking, and are an essential part of a good conference. Despite this, most virtual conferencing tools fail to provide support for such activities, instead focusing on austere goals related to saving money, time, and travel. This paper describes the concept of a Virtual Cocktail Party (VCP) tool to integrate into a virtual conference environment. In VCP the ‘party’ is presented as a mixture of individuals and small conversation groups ‘circulating’ at the virtual venue. Exploiting an automated speech-to-text system, words from conversations are shown in word-clouds displayed around conversation groups, sufficient to identify topics of conversation allowing participants to decide whether or not to join a group.

text: A virtual cocktail party: Supporting informal social interactions in a virtual conference Whilst the primary purpose of conferences is work — formal exchange and sharing of information — they almost always also include elements of play: Informal social and entertainment elements, such as receptions, dinners, and tourism activities. These activities also provide the opportunity for ‘serious’ discussions, meeting people, and networking, and are an essential part of a good conference. Despite this, most virtual conferencing tools fail to provide support for such activities, instead focusing on austere goals related to saving money, time, and travel. This paper describes the concept of a Virtual Cocktail Party (VCP) tool to integrate into a virtual conference environment. In VCP the ‘party’ is presented as a mixture of individuals and small conversation groups ‘circulating’ at the virtual venue. Exploiting an automated speech-to-text system, words from conversations are shown in word-clouds displayed around conversation groups, sufficient to identify topics of conversation allowing participants to decide whether or not to join a group.

year: 2018

title: Te Mana Motuhake o Ngāi Tamarāwaho and the challenges of education. Whakapūmautia te tangata i tōna ake mana

authors: Woller, Paul Robert

subjects: Ngāi Tamarāwaho

abstract: Throughout history, colonisation has deliberately suppressed and subordinated the knowledge, languages and identities of indigenous peoples. Colonial education policies were designed, at best, to domesticate indigenous children to create subjugated and compliant labouring classes.  These historical policies have intentionally consigned successive generations of indigenous families and communities to the socio-economic margins of the societies created by colonisation (Shields, Bishop & Masawi, 2005).
This thesis explores the intergenerational educational experiences of Ngāi Tamarāwaho, an indigenous Māori community in New Zealand, their relationship with Pākehā (colonial settlers of European descent) and their place, as Māori, in the society created by colonialism.  At the heart of this story is the inter-generational societal abuse of a small indigenous community and the active resistance of that community to colonisation. To survive as a people, Ngāi Tamarāwaho created a space at the intercultural interface between Māori and Pākehā by maintaining and revitalising their cultural identity and language. The intergenerational struggles of the whānau (families) of Ngāi Tamarāwaho, to engage with an imposed system of western education, are related through the narratives of hapū whānau (sub-tribal families) and from archival records. These stories demonstrate that educational failure was not because of the limitations of hapū whānau, but rather a result of the limiting conditions imposed on them. 
Despite these limitations, over the past 180 years, hapū leadership has focussed on maintaining the independent identity of the hapū and their mana motuhake, i.e. their right to be self-determining; seen as critical for whānau and hapū development and successful participation in wider society. To enable the success of future generations, Ngāi Tamarāwaho have accommodated new ideas and learning into their existing cultural framework by weaving together elements of learning from both Māori and Pākehā funds of knowledge. This hapū story has implications for current education settings intended to engage indigenous and minority students in learning and improve academic achievement. Strong cultural identities, and the ability to be self-determining, promote indigenous students’ self-esteem and the confidence to accommodate new learning into their existing cultural frameworks, thereby providing a platform for education success.

text: Te Mana Motuhake o Ngāi Tamarāwaho and the challenges of education. Whakapūmautia te tangata i tōna ake mana Throughout history, colonisation has deliberately suppressed and subordinated the knowledge, languages and identities of indigenous peoples. Colonial education policies were designed, at best, to domesticate indigenous children to create subjugated and compliant labouring classes.  These historical policies have intentionally consigned successive generations of indigenous families and communities to the socio-economic margins of the societies created by colonisation (Shields, Bishop & Masawi, 2005).
This thesis explores the intergenerational educational experiences of Ngāi Tamarāwaho, an indigenous Māori community in New Zealand, their relationship with Pākehā (colonial settlers of European descent) and their place, as Māori, in the society created by colonialism.  At the heart of this story is the inter-generational societal abuse of a small indigenous community and the active resistance of that community to colonisation. To survive as a people, Ngāi Tamarāwaho created a space at the intercultural interface between Māori and Pākehā by maintaining and revitalising their cultural identity and language. The intergenerational struggles of the whānau (families) of Ngāi Tamarāwaho, to engage with an imposed system of western education, are related through the narratives of hapū whānau (sub-tribal families) and from archival records. These stories demonstrate that educational failure was not because of the limitations of hapū whānau, but rather a result of the limiting conditions imposed on them. 
Despite these limitations, over the past 180 years, hapū leadership has focussed on maintaining the independent identity of the hapū and their mana motuhake, i.e. their right to be self-determining; seen as critical for whānau and hapū development and successful participation in wider society. To enable the success of future generations, Ngāi Tamarāwaho have accommodated new ideas and learning into their existing cultural framework by weaving together elements of learning from both Māori and Pākehā funds of knowledge. This hapū story has implications for current education settings intended to engage indigenous and minority students in learning and improve academic achievement. Strong cultural identities, and the ability to be self-determining, promote indigenous students’ self-esteem and the confidence to accommodate new learning into their existing cultural frameworks, thereby providing a platform for education success.

year: 2016