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: Proceedings of the INTERACT97 Combined Workshop on CSCW in HCI-Worldwide

authors: Rauterberg, Matthias

subjects: computer science

abstract: This is the proceedings for the INTERACT97 combined workshop on “CSCW in HCI-worldwide”. The position papers in this proceedings are those selected from topics relating to HCI community development worldwide and to CSCW issues. Originally these were to be two separate INTERACT workshops, but were combined to ensure sufficient participation for a combined workshop to run. 
The combined workshop has been split into two separate sessions to run in the morning of July 15th, Sydney, Australia. One to discuss the issues relating to the position papers focusing on general CSCW systems, the other to the development of HCI communities in a worldwide context. The CSCW session uses as a case study a proposed groupware tool for facilitating the development of an HCI database with a worldwide geographical distribution. The HCI community session focuses on developing the content for such a database, in order for it to foster the continued development of HCI communities. The afternoon session of the combined workshop involves a joint discussion of the case study groupware tool, in terms of its content and likely groupware facilities.
The position papers have been grouped into those focusing on HCI communities and hence content issues for a groupware database, and those focusing on CSCW and groupware issues, and hence likely groupware support in the proposed HCI database/collaboration tools. We hope that you find the position papers in this proceedings offer a wide range of interesting reports of HCI community development worldwide, leading CSCW system research, and that a groupware tool supporting aspects of a worldwide HCI database can draw upon the varied work reported.

text: Proceedings of the INTERACT97 Combined Workshop on CSCW in HCI-Worldwide This is the proceedings for the INTERACT97 combined workshop on “CSCW in HCI-worldwide”. The position papers in this proceedings are those selected from topics relating to HCI community development worldwide and to CSCW issues. Originally these were to be two separate INTERACT workshops, but were combined to ensure sufficient participation for a combined workshop to run. 
The combined workshop has been split into two separate sessions to run in the morning of July 15th, Sydney, Australia. One to discuss the issues relating to the position papers focusing on general CSCW systems, the other to the development of HCI communities in a worldwide context. The CSCW session uses as a case study a proposed groupware tool for facilitating the development of an HCI database with a worldwide geographical distribution. The HCI community session focuses on developing the content for such a database, in order for it to foster the continued development of HCI communities. The afternoon session of the combined workshop involves a joint discussion of the case study groupware tool, in terms of its content and likely groupware facilities.
The position papers have been grouped into those focusing on HCI communities and hence content issues for a groupware database, and those focusing on CSCW and groupware issues, and hence likely groupware support in the proposed HCI database/collaboration tools. We hope that you find the position papers in this proceedings offer a wide range of interesting reports of HCI community development worldwide, leading CSCW system research, and that a groupware tool supporting aspects of a worldwide HCI database can draw upon the varied work reported.

year: 1997-07

title: An exploration of the role of semantic relations in the theory and practice of translation (with special reference to English/Māori and Māori/English translation)

authors: Roa, Tom

subjects: clause relations

abstract: It is over forty years since Beekman and Callow, working within the context of the tagmemic tradition, drew attention to the potential significance so far as the theory and practice of translation are concerned of inter-propositional relations (also referred to as ‘discourse relations’, 'semantic relations', ‘semantico-pragmatic relations’, 'rhetorical relations’ and ‘clause relations’).  Since then, the importance of these relations has been increasingly acknowledged within linguistics and a range of other disciplines, including artificial intelligence. In spite of this, inter-propositional relations remain largely unexplored by the vast majority of those involved in translation. My aim in this research project was to determine (a) what impact, if any, a short training course in inter-propositional relations and inter-propositional relational signalling had on novice Māori-English/ English-Māori translators, and (b)  what impact my own understanding of these relations has had on my own practice as a translator. In connection with this, I conducted two studies.  

In the first of these studies, two small groups of novice translators were asked to translate seven text segments - some from English into te reo Māori, others from te reo Māori into English. They were then given a two-day workshop on inter-propositional relations and inter-propositional relational signalling in English and te reo Māori. No translation exercises were included in the workshop. The novice translators were then asked to translate the same text segments again. Comparison of the two sets of translations revealed some interesting differences, the second set indicating a higher level of sensitivity to inter-propositional relations and their signalling in the original text segments. This resulted in, it is argued here, translations that more accurately reflect authorial intentions as indicated in the source texts (see Chapter 3). In connection with this, it is relevant to note that, as indicated in the introductory chapter (Chapter 1) and in parts of the literature review (Chapter 2), while some of those involved in the Western tradition of translation theory and practice have argued that authorial intention is largely irrelevant in relation to textual interpretation, this essentially post-structural positioning is not available to those involved in translating indigenous texts within the context of indigenous worldviews.

In the second study, I used self-reflective think-aloud protocols to record my thoughts during the process of translating, from English into te reo Māori, text segments from five very different texts, all of these translations having been commissioned by different commissioning agencies. I then, making reference to the think-aloud transcripts, compared the source texts with the translations to determine the ways in which my reflections on inter-propositional relations and their signalling had impacted on the translations (Chapter 4).

My overall conclusion is that an understanding of inter-propositional relations and inter-propositional relational signalling can make a positive contribution to the theory and practice of translation and should be included in translator training and in the teaching of additional languages more generally (Chapter 5).

text: An exploration of the role of semantic relations in the theory and practice of translation (with special reference to English/Māori and Māori/English translation) It is over forty years since Beekman and Callow, working within the context of the tagmemic tradition, drew attention to the potential significance so far as the theory and practice of translation are concerned of inter-propositional relations (also referred to as ‘discourse relations’, 'semantic relations', ‘semantico-pragmatic relations’, 'rhetorical relations’ and ‘clause relations’).  Since then, the importance of these relations has been increasingly acknowledged within linguistics and a range of other disciplines, including artificial intelligence. In spite of this, inter-propositional relations remain largely unexplored by the vast majority of those involved in translation. My aim in this research project was to determine (a) what impact, if any, a short training course in inter-propositional relations and inter-propositional relational signalling had on novice Māori-English/ English-Māori translators, and (b)  what impact my own understanding of these relations has had on my own practice as a translator. In connection with this, I conducted two studies.  

In the first of these studies, two small groups of novice translators were asked to translate seven text segments - some from English into te reo Māori, others from te reo Māori into English. They were then given a two-day workshop on inter-propositional relations and inter-propositional relational signalling in English and te reo Māori. No translation exercises were included in the workshop. The novice translators were then asked to translate the same text segments again. Comparison of the two sets of translations revealed some interesting differences, the second set indicating a higher level of sensitivity to inter-propositional relations and their signalling in the original text segments. This resulted in, it is argued here, translations that more accurately reflect authorial intentions as indicated in the source texts (see Chapter 3). In connection with this, it is relevant to note that, as indicated in the introductory chapter (Chapter 1) and in parts of the literature review (Chapter 2), while some of those involved in the Western tradition of translation theory and practice have argued that authorial intention is largely irrelevant in relation to textual interpretation, this essentially post-structural positioning is not available to those involved in translating indigenous texts within the context of indigenous worldviews.

In the second study, I used self-reflective think-aloud protocols to record my thoughts during the process of translating, from English into te reo Māori, text segments from five very different texts, all of these translations having been commissioned by different commissioning agencies. I then, making reference to the think-aloud transcripts, compared the source texts with the translations to determine the ways in which my reflections on inter-propositional relations and their signalling had impacted on the translations (Chapter 4).

My overall conclusion is that an understanding of inter-propositional relations and inter-propositional relational signalling can make a positive contribution to the theory and practice of translation and should be included in translator training and in the teaching of additional languages more generally (Chapter 5).

year: 2016