Blinded by the Light: Connecting the Growth of Super-Massive Black Holes and Galaxy Evolution

For over 60 years, the scientific community has studied actively growing central super-massive black holes (active galactic nuclei -- AGN) but fundamental questions on their genesis and impact remain unanswered. Furthermore, AGN have long been purported to be the missing puzzle piece in understanding how galaxies grow and evolve to their present state. The field of SMBH-Galaxy Co-Evolution aims to answer the above questions by linking the growth of the super-massive blackholes to the growth of the galaxies they live in. Though, the very markers of AGN activity, an excess of light in almost every wavelength, also cause one of the greatest difficulties in accurately probing the properties of AGN Host galaxies: disentangling AGN emission from host-galaxy phenomena. In this thesis, I test key-predictions of popular SMBH-galaxy co-evolution theories using the combination of specific types of AGN and/or wavelength regimes to enable understanding of both the AGN and its host galaxy. I capitalized on the immense data archives fed by many of NASA's Great Observatories, constructed unique galaxy samples and developed novel statistical approaches. In this thesis, I detail how I uncover a tracer of direct evidence of AGN feedback in the local Universe (Lambrides et al. 2019), the discovery of a mis-classification of a large sample of heavily obscured AGN (Lambrides et al. 2020), and ruling out the most widely assumed triggering mechanism of obscured AGN using a novel method of merger identification(Lambrides et al. 2021a,b). From kiloparsecs to parsecs and back, testing galaxy evolution theories in both AGN triggering and feedback contexts is fundamental to understanding either process individually

New taxonomic records and regional trends for the Marquesan prehistoric marine fishery, Eiao Island, Polynesia

Eiao Island (39.2 km2, 577 m elevation), situated at the northern extent of the Marquesas Archipelago, features rocky and steep coastlines with few sheltered embayments that allow easy access to the sea and marine resources. We report the first evidence of prehistoric fishing practices from Eiao Island based on three inland sites (possibly dating from the 14th to 17th centuries), and explore variation in fish exploitation (NISP = 1021; MNI = 157). All previous archaeological fishing records from the archipelago are from coastal sites, with inland Eiao Island assemblages offering comparative data on site location and taxonomic composition. The Eiao Island fish bone assemblages are dominated by piscivorous taxa, specifically grouper (Serranidae). Few tuna, mackerel and bonito (Scombridae) remains were recovered from the Eiao Island assemblages, compared to reports from Ua Pou, Tahuata and Ua Huka. New family-level taxonomic records added for the archipelago include: bonefish (Albulidae), requiem sharks (Carcharhinidae), butterflyfish (Chaetodontidae), flagtail (Kuhliidae), damselfish (Pomacentridae) and rabbitfish (Siganidae). These results further contribute to our understanding of prehistoric Marquesan fishing practices and allow elucidation of subsistence in coastal vs. inland settings, variability in taxonomic composition between islands of the archipelago, and importantly inform on human-environment interactions in East Polynesia

Meta-analysis of Queensland’s coastal Indigenous fisheries: examining the archaeological evidence for geographic and temporal patterning

Marine fisheries have been a critical part of Aboriginal and Torres Strait Islander people’s connection to land and sea country in Queensland, Australia for millennia. However, no archaeological studies have examined regional variability in the role of fish within subsistence regimes or the distribution of targeted fish species throughout the Holocene. We utilised a meta-analysis approach to conduct the first comprehensive assessment of Indigenous fisheries along the eastern Queensland coast. Data from 44 archaeological sites were grouped according to marine bioregion to facilitate broad comparison between sites across the study area. These sites were predominantly associated with mid-to-late Holocene occupation, and provided an assemblage of 45,052 recovered fish bones, of which 6,606 were identified most commonly to family-level. Results indicate clear geographic patterning in the ubiquity of fish species captured, and for some marine bioregions an increase through time in the range of species targeted. Archaeological data indicate mixed species fisheries, with a complex range of habitats and diverse fish species harvested by people in relative proximity to the sites. These harvesting decisions were mediated by local ecological knowledge, awareness of fish behaviour, and cultural preference for certain species. These outcomes support existing models for the region, which document a shift in subsistence regimes during the mid-to-late Holocene, particularly an increased reliance on marine resources and expansion in diet breadth. Future research needs to address geographic gaps in data availability and implement globally recognised ichthyoarchaeological quantification and identification protocols to comprehensively examine geographic and temporal variability in Queensland’s Holocene Indigenous fisheries, and contribute to regional models of long-term subsistence change

Windward vs. leeward: inter-site variation in marine resource exploitation on Ebon Atoll, Republic of the Marshall Islands

The variation in windward and leeward marine environments has been linked to distinctions in marine subsistence on large, high volcanic Pacific Islands, but these patterns have not been explored on low coral atolls. We document windward vs. leeward islet site variation in the taxonomic composition of fish bone and mollusc shell assemblages from three archaeological sites at Ebon Atoll, Republic of the Marshall Islands, to elucidate the relationship between local environment, archaeological site type and the taxonomic composition of marine archaeofaunal assemblages. While the representation of taxa at each site was broadly similar in terms of measures of taxonomic heterogeneity (richness, evenness and dominance), chord distance and correspondence analysis reported variation in taxonomic composition at each site. For mollusc shell assemblages, variation in taxonomic abundance indicates the influence of the marine environments adjacent to each site and the relative exposure of these coastlines to heavy surf, wind, waves and extreme weather events. Fish bone assemblages recovered from 6.4 mm screens had less inter-site variation in richness, evenness and rank order, but differences were noted in the rank order of fish taxa recovered from selective 3.2 mm screening of archaeological deposits when compared between sites. In contrast to patterns for molluscs, variation in the taxonomic composition of fish bone assemblages likely relates to site function, rather than the marine environments adjacent to each site. These trends highlight for the first time the complex range of factors that influenced the prehistoric acquisition of marine resources between leeward and windward islets, and document variation in prehistoric marine subsistence within one atoll

Sustainable harvesting of Conomurex luhuanus and Rochia nilotica by Indigenous Australians on the Great Barrier Reef over the past 2000 years

Offshore island colonisation and use around the northern Australian coastline in the mid-to-late Holocene is associated with expanding Aboriginal and Torres Strait Islander populations and intensifying land-use activities. However, few explicit tests of the long-term effects of shellfish forager decision-making and associated impacts on intertidal ecosystems in these newly colonised island environments have been undertaken. We report morphometric analyses on two key reef flat Great Barrier Reef shellfish species, strawberry conch Conomurex luhuanus (n = 360) and top shell Rochia nilotica (n = 45), from two late Holocene archaeological shell midden assemblages on Lizard Island, northeast Queensland. Human foraging pressure was assessed through reconstructions of population age structure across time, highlighting the importance of determining size-at-age habitat preferences and species behaviour patterns when assessing long-term anthropogenic impacts on shellfish populations. Results show no evidence for resource depression across the late Holocene which is broadly in keeping with previous findings at other locales on the Great Barrier Reef, but contrary to expectations of resource intensification models. We conclude that the rich and abundant resources of reef flat environments were resilient to relatively low intensity and likely episodic Indigenous foraging. This sustainability contrasts with the scale and impacts of intensive industrialised harvesting in the historic period