Edge effects in patchy seagrass landscapes : the role of predation in determining fish distribution

Predation is often described as an underlying mechanism to explain edge effects. We assessed the importance of predation in determining edge effects in seagrass using two approaches: a video survey to sample predators at small scales across seagrass edges, and a tethering experiment to determine if predation was an underlying mechanism causing edge effects. Underwater videos were placed at four positions: middle of seagrass patches; edge of seagrass; sand immediately adjacent to seagrass and sand distant from seagrass. Fish abundances and the time fish spent in view were measured. The main predatory fish (Australian salmon, Arripis spp.) spent more time over adjacent sand than other positions, while potential prey species (King George whiting, Sillaginodes punctata (Cuvier), recruits) were more common in the middle of seagrass patches. Other species, including the smooth toadfish, Tetractenos glaber (Freminville), and King George whiting adults, spent more time over sand adjacent to seagrass than distant sand, which may be related to feeding opportunities. King George whiting recruits and pipefish (Stigmatopora spp.) were tethered at each of the four positions. More whiting recruits were preyed upon at outer than inner seagrass patches, and survival time was greater in the middle of shallow seagrass patches than other positions. Relatively few pipefish were preyed upon, but of those that were, survival time was lower over sand adjacent to seagrass than at the seagrass edge or middle. Video footage revealed that salmon were the dominant predators of both tethered King George whiting recruits and pipefish. The distribution of predators and associated rate of predation can explain edge effects for some species (King George whiting) but other mechanisms, or combinations of mechanisms, are determining edge effects for other species (pipefish).

Communication pathways in community aged care: an Australian study

Background:
Health and social care practitioners collaborate in discharge planning for older people. Difficulties securing timely and quality discharge information and unclear role boundaries can be challenging. There are limited reports in the literature describing community-based practitioners' roles communicating client information.

Aim:
To describe the roles of community-based practitioners in communication of older clients' information in an Australian context.

Design:
A descriptive and exploratory qualitative research design was applied.

Methods:
Four focus groups were conducted in 2009 with a small sample (n = 16) of district nurses, practice nurses and aged care case managers.

Results:
All participants described communication as a core characteristic of their role focused on minimising risks for older people. Participants valued dialogue with other health and social care providers in real time with an emphasis on telephone communication, face-to-face meetings, and case conferences. Telephone communication was considered important where there was an urgent need to problem solve. Written communication was noted as less effective.

Conclusions:
There is an increasing need for stronger models of communication in community-based settings to facilitate safe, efficient and sustainable health and social outcomes for older people.

Implications for practice:
There is limited available research with this focus to guide practice. Findings from this exploratory study indicate a number of important areas for further research: (i) to understand how communication feedback systems and pathways between community and inpatient providers could improve information exchange and (ii) to describe community nurses' roles in communication and medication risks for older people.

Alcohol sponsorship of community football clubs : the current situation

Issue addressed: There is accumulating evidence supporting a link between alcohol industry sponsorship and alcohol-related problems in both community and elite-level sports. Little is known, however, about the current status of such sponsorship, particularly of community sport. This study aimed to assess associations between alcohol industry sponsorship and different community football clubs in Australia.

Methods: The study involved 101 community football clubs across New South Wales, Australia. One representative from each club took part in a cross-sectional telephone survey designed to assess club (football code, number of players, socioeconomic and geographic descriptors) and alcohol industry sponsorship (money, equipment, free alcohol or discounted alcohol) characteristics. Chi-square analysis was used to test associations between club characteristics, and: i) any alcohol industry sponsorship; and ii) type of sponsorship.

Results: Eighty-eight per cent of clubs reported receiving sponsorship from the alcohol industry, and most clubs (82%) were sponsored by a licensed premises. There were no significant associations between club characteristics and source of alcohol industry sponsorship. However, small clubs were found to be significantly more likely to receive free or discounted alcohol sponsorship than larger clubs (p=0.05).

Conclusions: This exploratory study suggests a significant presence of alcohol industry sponsorship among community football clubs in Australia.

Trust evaluation for indirectly connected nodes using link community information

Inspired by recent empirical research on link communities, we borrow some important ideas and concepts for our own research to provide a more reasonable computation model of transitive trust. The key advantages of using link community methodology is to reflect on the nature of the social network features of Hierarchy and Overlap. Our research mainly resolves the computation of trust transitivity in which two nodes do not have any direct links to any link community. In this research, we discover a new direction analyzing trust transitivity. By using a social network game, we found that the link community methodology is a natural way to analyze trust in social networks. We also discovered, even in a small social network, trust has certain community features.

Dose-dependent increases in heart rate variability and arterial compliance in overweight and obese adults with DHA-rich fish oil supplementation

Heart rate (HR) variability and large arterial compliance can be improved using fish oils. DHA, a component of fish oil, has cardiovascular health benefits, but its effect on HR variability (HRV) and arterial compliance is yet to be quantified. Sixty-seven overweight or obese adults (thirty-six males and thirty-one females; 53 (sem 2) year; BMI 31·7 (sem 1·1) kg/m²) were randomly allocated to consume either 6 g/d sunola oil (control; n 17), fish oil (260 mg DHA+60 mg EPA per g) at doses of 2 g/d (n 16), 4 g/d (n 17) or 6 g/d (n 17). Blood pressure, HR and compliance of large and small arteries were measured while supine at baseline and after 12 weeks in all participants, and HRV was assessed in a subgroup of forty-six participants. There was no effect of fish oil on blood pressure, small artery compliance or HR. However, the low frequency:high frequency ratio of HRV decreased with increasing doses of fish oil (r − 0·34, P = 0·02), while large artery compliance increased (r 0·34, P = 0·006). Moreover, the changes in these biomarkers were significantly correlated (r − 0·31, P = 0·04) and may reflect fish oil-induced improvements in arterial function and cardiac autonomic regulation.

Finding a place for personal growth in an Australian community singing group for older people

As in many countries, Australia is faced with an aging population. This creates challenges for the maintenance of well-being which can be enhanced by active engagement in society. Music engagement encompasses a range of social participation and has the potential to recognise the contribution of older people to their local communities. Engagement in music by older people (50+) is positively related to individual and community well-being.  Music participation can contribute to a better quality of life, particularly in relation to health and happiness. The possible forms of music engagement are myriad.

This paper focuses on two members of a mixed voluntary singing group formed by older residents of an outer suburban community in Melbourne, Australia.  This study frames music as a positive way for older people to find a place for personal growth and fulfilment in a singing group. This phenomenological qualitative single case study focuses on two members of a small singing ensemble, the Skylarkers, formed to perform at retirement villages, nursing homes and facilities for senior citizens. In this study, data were gathered by interviews and analysed using interpretative phenomenological analysis.

Two significant themes emerged. The first concerned the nature of the choir and its fluid membership and notions of self-identity. The second theme concerns the validation offered to individual members by active music participation through which they gained a sense of purpose, fulfilment and personal growth. This emphasis is unusual in discussions of community music engagement that ordinarily identify the importance of social connections. Groups such as the Skylarkers provide a place for members to continue their active engagement with music performance and music learning.

Geo-social journalism: reorienting the study of small commercial newspapers in a digital environment

This paper begins by problematizing the use of “community” to define and theorize small commercial media outlets that have geography as their primary characteristic—particularly hyper local and small traditional newspapers connected to larger media organizations in digital space. We then extend the concept of “geo-social news” to outline “geo-social journalism” as a specific form of news work currently grouped under the “community media” umbrella. Geo-social is a concept for exploring how small commercial newspapers change as media technologies evolve. It offers a framework for understanding how these news outlets and audiences connect via the notion of “sense of place”. It can also be used as a lens for theorizing their role in social flows and movements and as nodes in the global media network. The practice of “geo-social journalism”, meanwhile, has two dimensions. Firstly, journalists must engage with the land (environment/agriculture/industry), populations, histories and cultures of the places they report news. Secondly, it involves connections and understandings of the shifting constellations of global and national systems, issues and relationships of the digital era. Finally, this paper argues that by its very nature, “geo-social journalism” eschews theoretical universalizing and instead demands fine-grained analyses of the specific dynamic of each “geo-social” publication, its setting and the practices which shape it and it in turn shapes.

Mates and majors: how the big fish survived

In October this year, the Queensland Government slashed funding to small-to-medium sized arts organisations. In part two of a three-part investigation, Ben Eltham asks why the smaller players were targeted, while the major institutions were protected.

Variation with depth in temperate seagrass-associated fish assemblages in Southern Victoria, Australia

Variability in the abundance and distribution of seagrass-associated fish assemblages was examined at different depths in a temperate bay in southern Australia. Depth differences in seagrass-associated fish assemblages are poorly known but this information is critical given that seagrass loss can occur at specific depths depending on the cause. Overall, 69 species of fish from 26 families were recorded, with higher species richness in shallow than deep beds, with 12 species found only in deep beds and 22 species found only in shallow beds. While the total fish abundance (i.e. abundance of all species recorded) varied between years and seasons, and to some extent between sites, it was significantly higher in shallow than deep seagrass beds in the majority of cases. Although there was some variation between sites, seagrass tended to be longer and have a higher biomass in shallow than deep beds during both spring and autumn throughout the study. A positive relationship between seagrass biomass/length and total fish abundance/species richness was apparent. Assemblage structure tended to be distinct at each depth, with the largest species recorded in shallow seagrass. Large numbers of small schooling fish, such as atherinids, dominated in shallow seagrass but were not found in deep seagrass. Loss of seagrass could therefore have varying implications for distinct assemblages found at different depths.

Stable isotope-based community metrics as a tool to identify patterns in food web structure in east African estuaries

1.Quantitative tools to describe biological communities are important for conservation and ecological management. The analysis of trophic structure can be used to quantitatively describe communities. Stable isotope analysis is useful to describe trophic organization, but statistical models that allow the identification of general patterns and comparisons between systems/sampling periods have only recently been developed. 2.Here, stable isotope-based Bayesian community-wide metrics are used to investigate patterns in trophic structure in five estuaries that differ in size, sediment yield and catchment vegetation cover (C3/C4): the Zambezi in Mozambique, the Tana in Kenya and the Rianila, the Betsiboka and Pangalanes Canal (sampled at Ambila) in Madagascar. 3.Primary producers, invertebrates and fish of different trophic ecologies were sampled at each estuary before and after the 2010–2011 wet season. Trophic length, estimated based on δ15N, varied between 3·6 (Ambila) and 4·7 levels (Zambezi) and did not vary seasonally for any estuary. Trophic structure differed the most at Ambila, where trophic diversity and trophic redundancy were lower than at the other estuaries. Among the four open estuaries, the Betsiboka and Tana (C4-dominated) had lower trophic diversity than the Zambezi and Rianila (C3-dominated), probably due to the high loads of suspended sediment, which limited the availability of aquatic sources. 4.There was seasonality in trophic structure at Ambila and Betsiboka, as trophic diversity increased and trophic redundancy decreased from the prewet to the postwet season. For Ambila, this probably resulted from the higher variability and availability of sources after the wet season, which allowed diets to diversify. For the Betsiboka, where aquatic productivity is low, this was likely due to a greater input of terrestrial material during the wet season. 5.The comparative analysis of community-wide metrics was useful to detect patterns in trophic structure and identify differences/similarities in trophic organization related to environmental conditions. However, more widespread application of these approaches across different faunal communities in contrasting ecosystems is required to allow identification of robust large-scale patterns in trophic structure. The approach used here may also find application in comparing food web organization before and after impacts or monitoring ecological recovery after rehabilitation.

Small axe

‘18C’ was a response to the impending amendments by the Coalition Government which will remove sections 18B – E of the Racial Discrimination Act (RDA). The Coalition has left a brief window to gauge community responses – so artists, writers and academics were requested to respond with a work on paper (photographic or pulp) to this change of the RDA. Incorporating many new and existing works ‘18C’ sends notice with visual, verbal and written work to ensure that this does not go unchallenged.

An open mic will part of the opening night for performances and responses throughout the evening. Documentation collated from the exhibition and opening night will be submitted to the office of the Australian Attorney General.

Artists include: Ange Bailey, Bumpy Favell, David Blumenstein, Dominic Golding, Heather Horricks, Jef Tan, Kirsten Lyttle, Lulu Quintanilla, Megan Evans, Peter Waples Crowe, Susan Forrester, Tama TK Favell, Torika Bolatagici, Angela Tiatia, Chiara Scafidi, Deborah Kelly, Frances Tapueluelu, Jason Heller, Jenny Fraser, Lian Low, Martin Nixon, Megan Cope, Robyne Latham, Taloi Havini, Texta Queen, Weniki Hensch.

“For them, it seems to be an abstract philosophical or legal argument. For them it’s a game, it’s a debate about words and abstract principles… For people who have experienced racism, it is a deeply personal debate, and it’s actually a debate about real people and real hurt.” - Penny Wong

Another minority group: use of aged care day programs and community leisure services by older people with lifelong disability

Objective: This study examined the extent to which programs available to the general aged community are accessible to older people with lifelong disability. Method: Forty Victorian generic aged day activity and community leisure programs used by older people responded to a survey that sought information on the extent to which such services are used by older people with a lifelong disability. Results: More than half of these services are accessed by a small number of people with lifelong disability and overall there was a willingness to include this group in generic services. Barriers and solutions to successful generic service use were reported. Conclusions: The findings indicate that the issues for people with lifelong disability differ little from those of other minority groups. It is proposed that disability services have a role in brokering services for their older clients, and continued planning and collaboration between disability and aged services will benefit all older people.

Conservation gone to the dogs : when canids rule the beach in small coastal reserves

On most developed coastlines, dunes backing ocean beaches constitute an urbanised landscape mosaic containing remnant pockets of small conservation areas. Urbanised beaches are also prime sites for domestic dogs, known to be environmentally harmful in many other settings. It is unknown, however, whether small, protected parcels of dune are adequate for biological conservation and whether dogs compromise their functional conservation objectives. Here we examine, for two small (2 km ocean boundary) reserves in Eastern Australia abutting an urban area, whether such small reserves can continue to function as effective conservation instruments on ocean beaches, using scavenger community composition and efficiency to assess ecosystem function. Two non-native species of canids—domestic dogs (Canis lupus familiaris) and red foxes (Vulpes vulpes)—were ubiquitous and numerous inside conservation areas, to the point of having become the most abundant vertebrate scavengers at the beach-dune interface, outcompeting native scavengers for wave-cast carrion. Dogs and foxes have effectively supplanted raptors, normally abundant on non-urban beaches in the region, and other avian scavengers, as the principal consumers of animal carcasses both inside the declared reserves and at the urban beach. Whilst the ecological threats posed by foxes are widely and intensively addressed in Australia in the form of fox-control programs, dog controls are less common and stringent. Our data emphasize, however, that managing domestic dogs may be required to the same extent in order to maintain key forms and functions in coastal reserves situated close to urban areas.

Youth depression alleviation: the Fish Oil Youth Depression Study (YoDA-F): A randomized, double-blind, placebo-controlled treatment trial.

US authorities have recommended 'black-box' warnings for antidepressants because of the increased risk of suicidality for individuals up to age 25. There is thus a clinical and ethical imperative to provide effective treatment for youth depression with an acceptable risk-benefit balance. Long-chain omega-3 polyunsaturated fatty acids (PUFAs) play an important role in a range of physiological processes in living organisms. Supplementation with omega-3 PUFAs has been shown to have a range of beneficial effects on both physical and mental health, and results of previous trials suggest that omega-3 PUFAs may be a safe and effective treatment for depression. However, conclusions from these trials have been limited by their relatively small sample sizes.