Colonisation by epibionts and meiofauna of real and mimic pneumatophores in a cool temperate mangrove habitat

The size and pace of change in meiofaunal assemblages suggest that meiofauna make excellent subjects for testing theories about how ecological communities change. A field experiment was performed in which the  abundance and composition of epibionts and meiofauna on natural,  transplanted and mimic pneumatophores were monitored over a 47 wk period. Meiofaunal density increased with growth of algal epibionts, both reaching maximum values after 24 wk, at the end of winter. At this time the assemblages from the 3 substrata were similar, although the combined abundances of meiofauna on transplants and mimics were only 28% of the average on natural pneumatophores. Meiofaunal abundance on all substrata decreased rapidly during spring as algal cover declined due to desiccation. Twenty-three species of nematode were recorded from mimics compared with 8 and 7 from transplants and pneumatophores, respectively. A temporal sequence of feeding groups occurred in the order of epigrowth feeders, deposit feeders, and omnivore/predators, with the latter 2 adding to rather than replacing earlier trophic groups. Scavengers were found only on natural pneumatophores. The turnover rates of nematode species between all census times were similar, peaking at 63%, but there was no trend in the turnover rates with time. We conclude that mimics are more suitable than transplanted pneumatophores for colonisation studies because of their greater persistence and more easily standardised surface area. Moreover, the composition of colonising assemblages on them closely resembled assemblages on natural pneumatophores at the time of peak meiofaunal abundance.

The effect of grazing gastropods on meiofaunal colonisation of pneumatophores in a temperate mangrove

A field experiment was run to assess how grazing affects meiofaunal colonisation of mimic pneumatophores in a temperate mangrove. The effects of two manipulated factors were tested: mimics (made from wooden dowel rods) were either implanted into the sediment, or suspended just above the substratum; and in addition were either fitted with an aluminium 'snail barrier' or left without. The abundance of meiofauna was estimated on the 4 treatments after 2, 4, 8 and 16 weeks in situ in the intertidal region. After 16 weeks the meiofaunal assemblage was dominated by copepods, and the effect of suspension was highly significant on abundance of the epibiotic assemblage. Mimics suspended above the sediment, out of reach of snails, were fouled with a green algal layer whereas implanted units were not. In contrast, 'snail barriers' were found to be relatively ineffective in preventing access by the dominant herbivorous gastropod Bembicium melanostomum. Meiofaunal assemblages were more abundant on suspended units, but there was greater taxonomic richness at levels of phylum and class on implanted units than on   suspended units. The colonising meiofaunal assemblage was less abundant on implanted mimics than in previous experiments at this study site, and this was attributed to the present experiment being carried out during the dry summer period, when meiofauna on pneumatophores is in decline.

Drifting or walking? colonisation routes used by different instars and species of lotic, macroinvertebrate filter feeders

Many views of stream invertebrate populations centre on drift as the major route of larval dispersal, but few studies have presented unambiguous information about the role of drift. We present the results from an experiment designed to determine whether the major route of colonisation of substrata by hydropsychid larvae (commonly found in the drift) is by drifting directly onto substrata or by walking along the stream bottom. The experimental design contained four treatments: substrata open to drifters and walkers; fenced substrata open to drifters only; and two treatments open to drifters and walkers that provided forms of fence controls. Fifteen replicates of each treatment were set out at random locations within a riffle at each of three sites, with each site on a different river (the Little River, the Steavenson River and the Acheron River) in the Acheron River catchment. The experiment was run twice, once during autumn (April 1999) and once during early summer (January 2000). Both experiments were colonised by three species of hydropsychids, Asmicridea sp. AV1, and Smicrophylax sp. AV1 and AV2. We found that 2nd/3rd instars of Asmicridea sp. AV1 walked as well as drifted, whereas all others primarily drifted. No relation between numbers of recruits and water speed was found when substrata were open only to drifters, whereas substrata open also to walkers gained more recruits in faster flows. Additionally, larvae more frequently abandoned nets in slow than fast flows, indicating that drifting into unfavourable flow environments may result in mortality or redispersal of larvae. These findings demonstrate that, although drift is important, it is not necessarily the only method used by hydropsychids to colonise substrata. Larvae may have more capacity to choose substrata in fast flows when they colonise substrata by walking. Spot measures of hydropsychid distribution cannot distinguish between these explanations. The finding that walkers can sometimes comprise significant numbers of recruits raises the prospect that hydropsychids can be sourced locally and have not inevitably drifted in from upstream locations.

'I am, by God, fit for high positions' : on the political role of women in al-Andalus

Narrating and explaining the fairly emancipated women in al-Andalus has been fraught with ambiguity for the approximately one century of scholarship on the subject. There has been much stereotyping depending upon the investigator's particular perspective. This paper clarifies the roles of Andalusian women in political relations from the Muslim Conquest in 711 through the fall of Granada in 1492. The interpretations used in historiography pit a traditionalist trend, in which continuity from the pre 1slamic past is stressed, against the anti-continuist trend, in which an Oriental culture of the Muslims added the distinctive features of Iberian character today. In order to evaluate the two historiographic approaches, the contributions of seven prominent women are presented and evaluated for their social contexts during the eight centuries of al-Andalus. Comparisons are then made to prominent women in other political contexts within the Arab world in order to evaluate the strength of the two competing historiographic perspectives.

A blog says I am here! : Encouraging reflection on performance-making and drama practice through blogs

This chapter considers the use of social software, in particular the blog, emerging from youth web-culture as a space for groups and individuals to reflect upon performance-making processes. lt focuses on the Drama Australia VINE project, launched at the beginning of 2006 through to its conclusion at the end of2007. The VINE project brought together groups of drama students within schools, universities and the broader community to make group performances based on a common theme. Using a multi-user blogging environment, vineblogs net, groups or individuals maintained blogs of their performance-making processes. This allowed the work to l¡e shared within the VINE project community and potentially with a worldwide audience. A case study was set up involving one class of students and their teachers who were involved in the VINE project and participants were asked to reflect and comment upon the performance-making and blogging experience. The chapter considers the challenge that we face as educators to find appropriate avenues to engage young people in reflection. It considers the ways in which students engage with technology that are ofter different from their teachers. The chapter goes on to discuss how blogs can contribute to the creation of a sense of individual or group identity and recognition. It asks, 'how do blogs encourage reflection upon performance-making processes and facilitate the creating of connections and the building of community between drama students and teachers across a range of settings?' Finally the chapter describes what we've learned about blogs in drama and considers where we go from here'

When, where and how am I now? Researching identity in university communities of practice

The establishment of communities of practice (CoPs) has emerged nationally as a strategy to promote ‘excellence’ in teaching and learning in Australian universities. CoPs in Australian universities have been reported as fostering the development of identity in practice and collegial academic identity. In these accounts identity development is associated with storytelling around everyday practice, although the relationship between narrative and identity development has not been explored or described in detail. Similarly, although the complex and changeable university contexts in which these CoPs operate is noted and described in the literature, there is currently no detailed account published of the relationship between the broader discourses that shape these contexts and the process of identity development in university CoPs. We argue in this paper that there is a need for a new way of researching identity formation in university CoPs. Drawing on Trinh Minh Ha’s work (1992), we propose that fragmentation be used as a working metaphor for thinking about and researching identity development in university CoPs, with direct reference to the contexts in which they operate. 
The proposed new approach takes into account the complexities and variety of discourses that influence identity formation in CoPs and the changeable and sometimes contradictory Enterprise University contexts in which Australian CoPs operate. In this paper fragmentation is described and applied to the process of researching identity formation in university CoPs. This paper also describes how fragmentation guides the combined narrative research and discourse analysis methods used in the proposed approach. This paper argues that fragmentation provides the means for developing practical (or experiential) insights as well as conceptually structuring a useful method for investigating discursive factors, to open up a variety of potential new understandings about identity formation in university CoPs.

Factors governing colonisation by forensically important blow flies in Victoria

This study investigated factors controlling blow fly infestation of simulated remains (meat baits) in Victoria. Temperature, light and dark and level of decay are most influential in determining infestation by maggots. This knowledge will assist in more accurate forensic estimations of the minimum time since death of a corpse.

Am I able? Is it worth it? Adolescent girls' motivational predispositions to school physical education : Associations with health-enhancing physical activity

The study purpose was to investigate predictive associations between adolescent girls’ motivational predispositions to physical education (PE) and habitual physical activity. Two hundred girls (age 13.1 ± 0.6 years) completed the Physical Education Predisposition Scale and the Physical Activity Questionnaire for Older Children. ANCOVAs revealed that girls with the highest Perceived PE Worth and Perceived PE Ability scores were the most habitually active groups (p < .0001). Significant predictors of physical activity identified by hierarchical regression were Perceived PE Ability and body mass index, which accounted for 17% and 3% of variance, respectively. As Perceived PE Ability was strongly associated with physical activity, the correlates of this construct should be further established to inform future school and PE-based interventions.

Influences of agricultural landuse and seasonal changes in abiotic conditions on invertebrate colonisation of riparian leaf detritus in intermittent streams

The structure and function of agricultural stream reaches with sparse riparian and floodplain vegetation differ from those of forested reaches, but may be ‘reset’ as these streams flow through reaches with forested riparian zones. We investigated whether invertebrate colonisation of River Red Gum (Eucalyptus camaldulensis) leaf packs in lowland intermittent streams was influenced by the adjacent reach-scale landuse (cleared farmland or forested reserve) within an agricultural catchment in Victoria, Australia. Further, we examined the influence of seasonal changes in hydrology and associated changes in abiotic conditions on the colonisation of leaves by repeating experiments over two summers and one spring. Across these experiments, there were no consistent differences in the structure of communities that colonised leaves in farmland and reserve reaches. In both seasons, most leaf colonists were collectors and few were shredders in both farmland and reserve reaches. Relative abundances of gastropod grazers were much higher in summer than in spring. The structure of invertebrate communities colonising leaves in the different reaches converged over time when streams flowed in spring, but diverged over time as the streams dried and abiotic conditions within disconnected pools became increasingly harsh in summer. Thus, patterns of leaf pack colonisation were influenced by the regional climate causing large seasonal changes in hydrology, but not by reach-scale landuse. The large-scale disturbances of agricultural landuse across the catchment and a supra-seasonal drought probably contributed to low diversities of invertebrate communities in the streams.