Understanding Plant Community Composition In Agricultural Welands: Context Dependent Effects And Plant Interactions

Community composition results from an integrated combination of random processes, regional habitat spatial structure, local environmental conditions, and species interactions. For example, the outcome of plant interactions can change depending on local environmental conditions such as nutrient availability, land management, or herbivory intensity. In particular, plant interactions may vary between facilitation and competition depending on ecological context, with facilitation expected to be prevalent under stressful conditions. I present the results of four studies that address different aspects of the community assemblage and dynamics emphasizing the synergistic effect of different processes. In the first, I investigated the importance of habitat isolation in determining species richness of wetlands with contrasting land use. The second describes an experiment to test the hypothesis that plant interactions with an unpalatable plant (Juncus effusus) would range from competition in ungrazed areas to facilitation in grazed areas and predicted that facilitative effects of Juncus would differ among functional groups of beneficiary species and be strongest when grazing was intense. In the third, I examine the community composition impacts of Juncus and predicted that Juncus would preserve functional diversity in grazed wetlands but that the effects of Juncus would vary along a grazing gradient. The fourth study investigated the relative importance of competition and nutrients in determining wetland invasion in two different land use types. Broadly, I demonstrate that the importance of different processes (habitat isolation, nutrient availability, competition/facilitation) to community composition is dependent on ecological conditions. This integrated view of community dynamics is interesting from a purely ecological perspective but also can be applied to understanding ecological problems such as exotic invasions and restoration of disturbed habitats

Parallels in Practice: Applying Principles of Research Integrity and Ethics in Domestic Violence Fatality Review (DVFR)

Purpose Within the context of the big data society, new systems of data collection on domestic violence and abuse (DVA) have emerged. One such system is Domestic Violence Fatality Review (DVFR) which captures the various dimensions of gender, violence, and abuse required to form an evidence base for prevention. However, to date, there has been limited dialogue between practitioners and researchers about the ‘doing’ of DVFRs. Method As DVFR systems vary by jurisdiction, we conducted a case study of Domestic Homicide Reviews (DHRs) in England and Wales. Applying the Research Integrity Framework (RIF) developed by the four Women’s Aid Federations in the United Kingdom (UK), this article examines both the practice of DHR and how it is utilised as data in research. Results Informed by our situated perspectives as researchers and/or practitioners working in the field, our analysis demonstrates how undertaking DHR as a practitioner parallels collecting, accessing, and analysing data from DHRs as a researcher. Guiding principles are identified to help practitioners and researchers navigate the parallel challenges they confront and, critically, inform dialogue between practice and research. Conclusions Implications for both professional practice and research are presented. To increase transparency and confidence, we argue that more attention should be afforded to the methodological and ethical issues inherent in both the practice of DHRs, and their utilisation as a source of data in research. While DHRs have differences to DVFRs in other jurisdictions, these findings also have implications for these other systems which will also be discussed

Patch-Burn Grazing Impacts Forage Resources in Subtropical Humid Grazing Lands

Subtropical humid grazing lands represent a large global land use and are important for livestock production, as well as supplying multiple ecosystem services. Patch-burn grazing (PBG) management is applied in temperate grazing lands to enhance environmental and economic sustainability; however, this management system has not been widely tested in subtropical humid grazing lands. The objective of this study was to determine how PBG affected forage resources, in comparison with the business-as-usual full-burn (FB) management in both intensively managed pastures (IMP) and seminative (SN) pastures in subtropical humid grazinglands. We hypothesized that PBG management would create patch contrasts in forage quantity and nutritive value in both IMP and SN pastures, with a greater effect in SN pastures. A randomized block design experiment was established in 2017 with 16 pastures (16 ha each), 8 each in IMP and SN at Archbold Biological Station\u27s Buck Island Ranch in Florida. PBG management employed on IMP and SN resulted in creation of patch contrast in forage nutritive value and biomass metrics, and recent fire increased forage nutritive value. Residual standing biomass was significantly lower in burned patches of each year, creating heterogeneity within both pasture types under PBG. PBG increased digestible forage production in SN but not IMP pastures. These results suggest that PBG may be a useful management tool for enhancing forage nutritive value and creating patch contrast in both SN and IMP, but PBG does not necessarily increase production relative to FB management. The annual increase in tissue quality and digestible forage production in a PBG system as opposed to once every 3 yr in an FB system is an important consideration for ranchers. Economic impacts of PBG and FB management in the two different pasture types are discussed, and we compare and contrast results from subtropical humid grazing lands with continental temperate grazing lands

Exploring How Australia's National Curriculum Supports the Aspirations of Aboriginal People

A culturally inclusive curriculum has long been considered beneficial to all students. The national Australian Curriculum set out to be so, including Aboriginal and Torres Strait Islander histories and cultures as a cross-curriculum priority. There is an assumption however that inclusion is an unproblematic good, and is a true representation of the 'reality' of Aboriginal and Torres Strait Islander Peoples' lived experiences and aspirations. Drawing on a Critical Discourse Analysis of the Australian Curriculum policy corpus and key informant interviews with members of an Aboriginal community, this dissertation explores how the aspirations of Aboriginal people are supported in dominant education discourses mobilised within the Australian Curriculum. The study identified a critical gap between the Australian Curriculum's positioning of Aboriginal knowledges, histories and cultures and the Aboriginal community's aspirations for their children's education. Within the Australian Curriculum policy corpus, 'Liberal Multicultural' and 'Inclusive' Discourses were dominant. Such discourses framed Aboriginal students as being vulnerable to marginalisation and in need of support to ensure equality in education. In contrast, community informants advocated for more critical discourses whereby Aboriginal students are seen as empowered, able to actively participate in mainstream society to engage in a process of community revitalisation. In drawing upon different and at times contradictory discourses to articulate their aspirations within a broader 'Community Revitalisation' Discourse, community members engaged in a creative act of bricolage in a highly contextually-dependent way

Challenges and Opportunities to Increase Carbon Sequestration in Subtropical Grazing Lands

Livestock production has a significant environmental footprint. However, adoption of regenerative grazing land management practices can serve as a means of producing food with lower, or even net positive environmental impacts. Globally, much of the grazing land ecosystems are degraded due to improper management. This is particularly true in the southeastern US, where extensive areas of planted pastures are degraded due to inadequate nutrient and soil management. In this presentation, we will discuss the opportunities and challenges associated with increasing soil and ecosystem C sequestration in subtropical grazing lands through regenerative management practices. Introductio

Parallels in Practice: Applying Principles of Research Integrity and Ethics in Domestic Violence Fatality Review (DVFR)

Purpose Within the context of the big data society, new systems of data collection on domestic violence and abuse (DVA) have emerged. One such system is Domestic Violence Fatality Review (DVFR) which captures the various dimensions of gender, violence, and abuse required to form an evidence base for prevention. However, to date, there has been limited dialogue between practitioners and researchers about the ‘doing’ of DVFRs. Method As DVFR systems vary by jurisdiction, we conducted a case study of Domestic Homicide Reviews (DHRs) in England and Wales. Applying the Research Integrity Framework (RIF) developed by the four Women’s Aid Federations in the United Kingdom (UK), this article examines both the practice of DHR and how it is utilised as data in research. Results Informed by our situated perspectives as researchers and/or practitioners working in the field, our analysis demonstrates how undertaking DHR as a practitioner parallels collecting, accessing, and analysing data from DHRs as a researcher. Guiding principles are identified to help practitioners and researchers navigate the parallel challenges they confront and, critically, inform dialogue between practice and research. Conclusions Implications for both professional practice and research are presented. To increase transparency and confidence, we argue that more attention should be afforded to the methodological and ethical issues inherent in both the practice of DHRs, and their utilisation as a source of data in research. While DHRs have differences to DVFRs in other jurisdictions, these findings also have implications for these other systems which will also be discussed

Parallels in Practice: Applying Principles of Research Integrity and Ethics in Domestic Violence Fatality Review (DVFR)

Purpose: Within the context of the big data society, new systems of data collection on domestic violence and abuse (DVA) have emerged. One such system is Domestic Violence Fatality Review (DVFR) which captures the various dimensions of gender, violence, and abuse required to form an evidence base for prevention. However, to date, there has been limited dialogue between practitioners and researchers about the ‘doing’ of DVFRs. Method: As DVFR systems vary by jurisdiction, we conducted a case study of Domestic Homicide Reviews (DHRs) in England and Wales. Applying the Research Integrity Framework (RIF) developed by the four Women’s Aid Federations in the United Kingdom (UK), this article examines both the practice of DHR and how it is utilised as data in research. Results: Informed by our situated perspectives as researchers and/or practitioners working in the field, our analysis demonstrates how undertaking DHR as a practitioner parallels collecting, accessing, and analysing data from DHRs as a researcher. Guiding principles are identified to help practitioners and researchers navigate the parallel challenges they confront and, critically, inform dialogue between practice and research. Conclusions: Implications for both professional practice and research are presented. To increase transparency and confidence, we argue that more attention should be afforded to the methodological and ethical issues inherent in both the practice of DHRs, and their utilisation as a source of data in research. While DHRs have differences to DVFRs in other jurisdictions, these findings also have implications for these other systems which will also be discussed

Opposing community assembly patterns for dominant and non-dominant plant species in herbaceous ecosystems globally

Biotic and abiotic factors interact with dominant plants—the locally most frequent or with the largest coverage—and nondominant plants differently, partially because dominant plants modify the environment where nondominant plants grow. For instance, if dominant plants compete strongly, they will deplete most resources, forcing nondominant plants into a narrower niche space. Conversely, if dominant plants are constrained by the environment, they might not exhaust available resources but instead may ameliorate environmental stressors that usually limit nondominants. Hence, the nature of interactions among nondominant species could be modified by dominant species. Furthermore, these differences could translate into a disparity in the phylogenetic relatedness among dominants compared to the relatedness among nondominants. By estimating phylogenetic dispersion in 78 grasslands across five continents, we found that dominant species were clustered (e.g., co-dominant grasses), suggesting dominant species are likely organized by environmental filtering, and that nondominant species were either randomly assembled or overdispersed. Traits showed similar trends for those sites (<50%) with sufficient trait data. Furthermore, several lineages scattered in the phylogeny had more nondominant species than expected at random, suggesting that traits common in nondominants are phylogenetically conserved and have evolved multiple times. We also explored environmental drivers of the dominant/nondominant disparity. We found different assembly patterns for dominants and nondominants, consistent with asymmetries in assembly mechanisms. Among the different postulated mechanisms, our results suggest two complementary hypotheses seldom explored: (1) Nondominant species include lineages adapted to thrive in the environment generated by dominant species. (2) Even when dominant species reduce resources to nondominant ones, dominant species could have a stronger positive effect on some nondominants by ameliorating environmental stressors affecting them, than by depleting resources and increasing the environmental stress to those nondominants. These results show that the dominant/nondominant asymmetry has ecological and evolutionary consequences fundamental to understand plant communities.EEA Santa CruzFil: Arnillas, Carlos Alberto. University of Toronto Scarborough. Department of Physical and Environmental Sciences; Canadá.Fil: Borer, Elizabeth T. University of Minnesota; Estados UnidosFil: Seabloom, Eric W. University of Minnesota; Estados UnidosFil: Alberti, Juan. Universidad Nacional de Mar del Plata. Instituto de Investigaciones Marinas y Costeras; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones Marinas y Costeras; Argentina.Fil: Baez, Selene. Escuela Politécnica Nacional. Department of Biology; Ecuador.Fil: Bakker, Jonathan D. University of Washington. School of Environmental and Forest Sciences; Estados UnidosFil: Boughton, Elizabeth H. Archbold Biological Station. Venus, Florida; Estados UnidosFil: Buckley, Yvonne M. Trinity College Dublin. School of Natural Sciences, Zoology; IrlandaFil: Bugalho, Miguel Nuno. University of Lisbon. Centre for Applied Ecology Prof. Baeta Neves (CEABN-InBIO). School of Agriculture; Portugal.Fil: Donohue, Ian. Trinity College Dublin. School of Natural Sciences, Zoology; IrlandaFil: Dwyer, John. University of Queensland. School of Biological Sciences; Australia.Fil: Firn, Jennifer. Queensland University of Technology (QUT); Australia.Fil: Peri, Pablo Luis. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Santa Cruz; Argentina.Fil: Peri, Pablo Luis. Universidad Nacional de la Patagonia Austral; Argentina.Fil: Peri, Pablo Luis. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.Fil: Cadotte, Marc W. University of Toronto Scarborough. Department of Biological Sciences; Canadá.Fil: Cadotte, Marc W. University of Toronto. Department of Ecology and Evolutionary Biology; Canadá