Methods to prioritise adaptation options for iconic seabirds and marine mammals impacted by climate change

Climate change is already impacting a wide range of marine species around Australia. Australia has a large number of marine mammals and seabirds, particularly when Australian Antarctic and Southern Ocean species are included: 110 species of seabird and 52 species of marine mammal. These iconic species are protected throughout Australia and in some cases are recovering from previous anthropogenic impacts including harvest. The first tool we developed is a simple 'cost-benefit- risk' (CBR) screening tool to evaluate each scenario-specific adaptation option against a number of semi-quantitative attributes. Awareness and identification of potentially contested options would be useful to managers charged with implementing adaptation options. Following on from specific application, testing some of the adaptation options in limited field trials would be a useful next step, further building the experience of researchers and managers charged with securing the status of these iconic species in the future.

Disentangling the cause of a catastrophic population decline in a large marine mammal

Considerable uncertainties often surround the causes of long-term changes in population abundance. One striking example is the precipitous decline of southern sea lions (SSL; Otariaflavescens) at the Falkland Islands, from 80 555 pups in the mid 1930s to just 5506 pups in 1965. Despite an increase in SSL abundance over the past two decades, the population has not recovered, with the number of pups born in 2014 (minimum 4443 pups) less than 6% of the 1930s estimate. The order-of-magnitude decline is primarily attributed to commercial sealing in Argentina. Here, we test this established paradigm and alternative hypotheses by assessing (1) commercial sealing at the Falkland Islands, (2) winter migration of SSL from the Falkland Islands to Argentina, (3) whether the number of SSL in Argentina could have sustained the reported level of exploitation, and (4) environmental change. The most parsimonious hypothesis explaining the SSL population decline was environmental change. Specifically, analysis of 160 years of winter sea surface temperatures revealed marked changes, including a period of warming between 1930 and 1950 that was consistent with the period of SSL decline. Sea surface temperature changes likely influenced the distribution or availability of SSL prey and impacted its population dynamics. We suggest that historical harvesting may not always be the "smoking gun" as is often purported. Rather, our conclusions support the growing evidence for bottom-up forcing on the abundance of species at lower trophic levels (e.g., plankton and fish) and resulting impacts on higher trophic levels across a broad range of ecosystems.

‘On my ground’: Indigenous farmers at New Norcia 1860s-1900s

These words were penned in 1867 by Father Venancio Garrido, a Benedictine monk at New Norcia Aboriginal mission in Western Australia (see Map 4.1). They form part of his lengthy report on the mission which was requested by the Colonial Secretary to be forwarded to the Aborigines Protection Society in London. In 1871 Father Garrido’s report was collated alongside other ‘information’ about Aborigines in Western Australia that had been collected by missionaries and government agents, and was printed by the government printer. The above statement suggests two issues which I will draw out in this chapter: the Aboriginal residents at New Norcia had a strong sense of right and wrong; and the Benedictine community at New Norcia considered them to be the original owners of the land which was, in 1867, increasingly occupied by pastoralists.

"Na miña terra": granxeiros indíxenas en Nova Nursia entre as décadas de 1860 e 1900

These words were penned in 1867 by Father Venancio Garrido, a Benedictine monk at New Norcia Aboriginal mission in Western Australia (see Map 4.1). They form part of his lengthy report on the mission which was requested by the Colonial Secretary to be forwarded to the Aborigines Protection Society in London. In 1871 Father Garrido’s report was collated alongside other ‘information’ about Aborigines in Western Australia that had been collected by missionaries and government agents, and was printed by the government printer. The above statement suggests two issues which I will draw out in this chapter: the Aboriginal residents at New Norcia had a strong sense of right and wrong; and the Benedictine community at New Norcia considered them to be the original owners of the land which was, in 1867, increasingly occupied by pastoralists.

Early-life sexual segregation: ontogeny of isotopic niche differentiation in the Antarctic fur seal

Investigating the ontogeny of niche differentiation enables to determine at which life-stages sexual segregation arises, providing insights into the main factors driving resource partitioning. We investigated the ontogeny of foraging ecology in Antarctic fur seals (Arctocephalus gazella), a highly dimorphic species with contrasting breeding strategies between sexes. Sequential δ(13)C and δ(15)N values of whiskers provided a longitudinal proxy of the foraging niche throughout the whole life of seals, from weaning, when size dimorphism is minimal to the age of 5. Females exhibited an early-life ontogenetic shift, from a total segregation during their first year at-sea, to a similar isotopic niche as breeding females as early as age 2. In contrast, males showed a progressive change in isotopic niche throughout their development such that 5-year-old males did not share the same niche as territorial bulls. Interestingly, males and females segregated straight after weaning with males appearing to feed in more southerly habitats than females. This spatial segregation was of similar amplitude as observed in breeding adults and was maintained throughout development. Such early-life niche differentiation is an unusual pattern and indicates size dimorphism and breeding constraints do not directly drive sexual segregation contrary to what has been assumed in otariid seals.

Pronounced inter-colony variation in the foraging ecology of Australasian gannets : influence of habitat differences

The predictability of prey due to oceanographic features can result in large aggregations of apex predators. Central place foragers, such as seabirds, are limited in their foraging duration and range during the breeding period, which can restrict their ability to reach such locations. Segregation by colony and sex can further restrict foraging range and may have direct implications for the foraging ecology of a species. In parts of its range, the Australasian gannet Morus serrator breeds in colonies of relatively close proximity and has recently been found to display sexual dimorphism. Two neighbouring breeding colonies in Bass Strait that experience divergent environmental conditions were investigated to determine whether these conditions or the sex of the individual are important variables influencing foraging behaviour in this species. GPS tracking and accelerometry were paired with stable isotope analysis to compare differences in foraging effort, habitat use and diet. Birds from Point Danger, a large colony located near a seasonally strong upwelling, travelled considerably further (77%) than birds from Pope's Eye, a small colony in a nutrient-poor embayment. However, within colonies no sexual differences in foraging effort were found. While the colonies did not overlap in foraging areas, a degree of sexual segregation was apparent within both colonies (Point Danger 46.3% overlap and Pope's Eye 73.7% overlap in home range). Furthermore, stable isotope analysis indicated birds from each colony fed at different trophic niches. This study reveals differences in habitat use and, consequently, dietary niches between and within neighbouring colonies.

Testing optimal foraging theory models on benthic divers

Empirical testing of optimal foraging models on diving air-breathing animals is limited due to difficulties in quantifying the prey field through direct observations. Here we used accelerometers to detect rapid head movements during prey encounter events (PEE) of free-ranging benthic-divers, Australian fur seals, Arctocephalus pusillus doriferus. PEE signals from accelerometer data were validated by simultaneous video data. We then used PEEs as a measure of patch quality to test several optimal foraging model predictions. Seals had longer bottom durations in unfruitful dives (no PEE) than those with some foraging success (PEE. ≥. 1). However, when examined in greater detail, seals had longer bottom durations in dives with more PEEs, but shorter bottom durations in bouts (sequences of dives) with more PEEs. Our results suggest that seals were generally maximizing bottom durations in all foraging dives, characteristic of benthic divers. However, successful foraging dives might be more energetically costly (e.g. digestive costs), thus resulting in shorter bottom durations at the larger scale of bouts. Our study provides a case study of how the foraging behaviour of a central place forager foraging in a fairly homogeneous environment, with relatively high travel costs, may deviate from current foraging models under different situations. Future foraging models should aim to integrate other aspects (e.g. diet) of the foraging process for more accurate predictions.

Lessons from Alison: a narrative study of differentiation in classroom teaching

Teaching is challenging in part because, although school structures are to some extent modelled on industrial approaches in which the ‘raw materials’ are assumed to be very similar, human beings are endlessly diverse. Understanding the many differences amongst students, and treating these differences as teaching resources rather than deficits, is a powerful approach. This paper draws on teacher interviews and classroom observations collected during a two-year study of two regional Queensland schools to explore issues of ‘recognition’, ‘distribution’ and social justice. It uses narrative vignettes from a single classroom to provide an occasion for reflection on the part of the reader on how schooling can better meet the needs of students, and outlines six pedagogical practices for effective classroom teaching.

Differentiated learning: from policy to classroom

This paper explores the impact of a Teaching and Learning Audit of all government schools in Queensland, Australia. This audit has a concern with the extent to which schools ‘differentiate classroom learning’. We note that in England, since September 2012, one of the standards that teachers have been expected to demonstrate is an ability to ‘differentiate appropriately’, and thus the lessons of how this particular audit was implemented in Queensland have relevance outside of Australia. The paper draws on data collected from Red Point High School, one of the State’s 1257 schools and education centres audited in 2010. We suggest that this requirement to differentiate classroom learning was implemented without appropriate clarity or support, and that it increased teacher surveillance in this school. However, we also argue that some spaces were opened up by this audit, and its concern with differentiation, to articulate a social justice agenda within the school. We conclude that differentiation is a complex concept which is not easy to shift from a policy to a classroom context, and requires more careful explication at policy level and more support for teachers to enact.

Sexual segregation in habitat use is smaller than expected in a highly dimorphic marine predator, the southern sea lion

Sexual segregation in habitat use is widely reported in many taxa and can profoundly influence the distribution and behaviour of animals. However, our knowledge of the mechanisms driving sexual segregation is still in its infancy (particularly in marine taxa) and the influence of extrinsic factors in mediating the expression of sex differences in foraging behaviour is underdeveloped. Here, we combine data from biologging tags, with stable isotope analysis of vibrissae, to assess sexual segregation in southern sea lions (SSL) (Otaria flavescens) breeding at the Falkland Islands in the South Atlantic. We found evidence to support segregation, most notably in δ13C and δ15N values. However, in spite of extreme sexual size dimorphism and differing constraints related to female-only parental care, adult male and adult female SSL overlapped considerably in isotopic niches and foraging area, and shared similar foraging trip characteristics (such as distance and duration). This is in contrast to SSL breeding in Argentina, where prior studies report sexual differences in foraging locations and foraging trip characteristics. We posit that sexual segregation in SSL is influenced by habitat availability (defined here as the width of the Patagonian Shelf) and individual foraging preferences, rather than commonly invoked individual-based limiting factors per se.

Investigating ‘moments’ for student agency through a differentiated music curriculum

Research provides compelling evidence linking music-making to academic achievement and increased wellbeing for disengaged students. However, in the Australian context, education policy has narrowed its focus to literacy and numeracy, with an associated ‘accountability’ framework of mandated assessment and reporting practices. Within this context teachers are being asked to demonstrate how, through their pedagogical practices, they meet the needs of all their students. As a result of this, differentiation has become the lens through which student learning and engagement are being monitored. Drawing on data from a large state secondary school, this paper examines how a differentiated music curriculum is being implemented to support student agency. We demonstrate that, through a range of formal and informal music programs, agency is enhanced through the development of self-reflexive and self-referential learning practices. However, we suggest that differentiation, alone, does not unmask the reasons behind students’ different learning experiences nor does it necessarily redress entrenched educational inequalities. We also suggest that the ‘moments’ for student agency, created by these music programs, may have as much to do with the ‘fragile’ position of music within the broader school curriculum where the spotlight of high-stakes testing is directed elsewhere.

Sensitivity of fine-scale species distribution models to locational uncertainty in occurrence data across multiple sample sizes

To generate realistic predictions, species distribution models require the accurate coregistration of occurrence data with environmental variables. There is a common assumption that species occurrence data are accurately georeferenced; however, this is often not the case. This study investigates whether locational uncertainty and sample size affect the performance and interpretation of fine-scale species distribution models. This study evaluated the effects of locational uncertainty across multiple sample sizes by subsampling and spatially degrading occurrence data. Distribution models were constructed for kelp (Ecklonia radiata), across a large study site (680 km2) off the coast of southeastern Australia. Generalized additive models were used to predict distributions based on fine-resolution (2·5 m cell size) seafloor variables, generated from multibeam echosounder data sets, and occurrence data from underwater towed video. The effects of different levels of locational uncertainty in combination with sample size were evaluated by comparing model performance and predicted distributions. While locational uncertainty was observed to influence some measures of model performance, in general this was small and varied based on the accuracy metric used. However, simulated locational uncertainty caused changes in variable importance and predicted distributions at fine scales, potentially influencing model interpretation. This was most evident with small sample sizes. Results suggested that seemingly high-performing, fine-scale models can be generated from data containing locational uncertainty, although interpreting their predictions can be misleading if the predictions are interpreted at scales similar to the spatial errors. This study demonstrated the need to consider predictions across geographic space rather than performance alone. The findings are important for conservation managers as they highlight the inherent variation in predictions between equally performing distribution models, and the subsequent restrictions on ecological interpretations.

Outcropping reef ledges drive patterns of epibenthic assemblage diversity on cross-shelf habitats

Seafloor habitats on continental shelf margins are increasingly being the subject of worldwide conservation efforts to protect them from human activities due to their biological and economic value. Quantitative data on the epibenthic taxa which contributes to the biodiversity value of these continental shelf margins is vital for the effectiveness of these efforts, especially at the spatial resolution required to effectively manage theseecosystems. We quantified the diversity of morphotype classes on an outcropping reef system characteristic of the continental shelf margin in the Flinders Commonwealth Marine Reserve, southeastern Australia. The system is uniquely characterized by long linear outcropping ledge features in sedimentary bedrock that differ markedly from the surrounding low-profile, sand-inundated reefs. We characterize a reef system harboring rich morphotype classes, with a total of 55 morphotype classes identified from the still images captured by an autonomous underwater vehicle. The morphotype class Cnidaria/Bryzoa/Hydroid matrix dominated the assemblages recorded. Both a and b diversitydeclined sharply with distance from nearest outcropping reef ledge feature. Patterns of the morphotype classes were characterized by (1) morphotype turnover at scales of 5 to 10s m from nearest outcropping reef ledge feature, (2) 30 % of morphotype classes were recordedonly once (i.e. singletons), and (3) generally low levels of abundance (proportion cover) of the component morphotype class. This suggests that the assemblages in this region contain a considerable number of locally rare morphotype classes. This study highlights the particular importance of outcropping reef ledge features in this region, as they provide a refuge against sediment scouring and inundation common on the low profile reef that characterizes this region. As outcropping reef features, they represent a small fraction of overall reef habitat yet contain much of the epibenthic faunal diversity. This study has relevance to conservation planning for continental shelf habitats, as protecting a single, or few, areas of reef is unlikely to accurately represent the geomorphic diversity of cross-shelf habitats and the morphotype diversity that is associated with these features. Equally, whendesigning monitoring programs these spatially-discrete, but biologically rich outcropping reef ledge features should be considered as distinct components in stratified sampling designs.

Using Butler to understand the multiplicity and variability of policy reception

Understanding how teachers make sense of education policy is important. We argue that an exploration of teacher reactions to policy requires an engagement with theory focused on the formation of ‘the subject’ since this form of theorisation addresses the creation of a seemingly coherent identity and attitude while acknowledging variation across different places and people. In this paper, we propose the utility of Butlerian ideas because of the focus on subjectivity that her work entails and the account she gives for social norms regulating people’s actions and attitudes. We use Butler’s stance on how ‘cultural intelligibility’ is formed to account for the complex, messy and sometimes contradictory ‘take up’ of curriculum policy by 10 teachers at a secondary school case study in Queensland, Australia. We use the phrase ‘policy reception’ to signify a particular theoretical line of thought we are forming with our application of Butlerian theory to the analysis of teacher attitudes toward curriculum policy, and to distinguish it from ‘policy interpretation’, ‘policy translation’ and ‘policy enactment’.

Beyond culturalism: addressing issues of Indigenous disadvantage through schooling

This paper draws from a study that explored issues of student equity, marginality and diversity in two secondary schools in regional Queensland (Australia). The paper foregrounds interview data gathered from administration, teaching and ancillary staff at one of the schools, ‘Crimson’ High School. The school has a high Indigenous student population and is well recognised within the broader community as catering well to this population. With reference to the school’s concerns about Indigenous disadvantage and the various approaches undertaken to address this disadvantage, the paper articulates the significance of educators being critically aware of how they construct race and use it as an organising principle in their work. This awareness is central to moving beyond the culturalism and racial incommensurability that tend to predominate within Indigenous education—where cultural reductionism homogenises indigeneity within and against a dominant White norm. With reference to a specific approach at the school designed predominantly for Indigenous male students—to foster inter-cultural awareness and respect through sport—we highlight ways in which notions of culturalism and racial incommensurability might be disrupted.