title: An investigation of microbial communities across two extreme geothermal gradients on Mt. Erebus, Victoria Land, Antarctica

authors: Smith, Emily

abstract: The geothermal fumaroles present on Mt. Erebus, Antarctica, are home to numerous unique and possibly endemic bacteria. The isolated nature of Mt. Erebus provides an opportunity to closely examine how geothermal physico-chemistry drives microbial community composition and structure. This study aimed at determining the effect of physico-chemical drivers on microbial community composition and structure along extreme thermal and geochemical gradients at two sites on Mt. Erebus: Tramway Ridge and Western Crater. Microbial community structure and physico-chemical soil characteristics were assessed via metabarcoding (16S rRNA) and geochemistry (temperature, pH, total carbon (TC), total nitrogen (TN) and ICP-MS elemental analysis along a thermal gradient 10 °C–64 °C), which also defined a geochemical gradient. Diversity increased in alkaline soils suggesting pH to be the primary driver of microbial community structure across the gradients. Archaea dominated the microbial communities at Tramway Ridge compared to Western Crater, which was dominated by Bacteria. Western Crater has been sampled for the first time, widening the understanding of geothermal sites on Mt. Erebus. Organisms that were once considered cosmopolitan may not be as cosmopolitan as expected in Antarctica. These organisms may require specific niches that allow them to colonise new habitats. This study also showed that gathering more samples from Tramway Ridge has widened understanding of the changing environments that microbial communities on Mt. Erebus live in. The study provides a foundation on which to compare microbial and geochemical interactions across all geothermal sites within Victoria Land. This supports the effect of specific geothermal characteristics of the fumaroles in manipulating the microbial communities present.

text: An investigation of microbial communities across two extreme geothermal gradients on Mt. Erebus, Victoria Land, Antarctica The geothermal fumaroles present on Mt. Erebus, Antarctica, are home to numerous unique and possibly endemic bacteria. The isolated nature of Mt. Erebus provides an opportunity to closely examine how geothermal physico-chemistry drives microbial community composition and structure. This study aimed at determining the effect of physico-chemical drivers on microbial community composition and structure along extreme thermal and geochemical gradients at two sites on Mt. Erebus: Tramway Ridge and Western Crater. Microbial community structure and physico-chemical soil characteristics were assessed via metabarcoding (16S rRNA) and geochemistry (temperature, pH, total carbon (TC), total nitrogen (TN) and ICP-MS elemental analysis along a thermal gradient 10 °C–64 °C), which also defined a geochemical gradient. Diversity increased in alkaline soils suggesting pH to be the primary driver of microbial community structure across the gradients. Archaea dominated the microbial communities at Tramway Ridge compared to Western Crater, which was dominated by Bacteria. Western Crater has been sampled for the first time, widening the understanding of geothermal sites on Mt. Erebus. Organisms that were once considered cosmopolitan may not be as cosmopolitan as expected in Antarctica. These organisms may require specific niches that allow them to colonise new habitats. This study also showed that gathering more samples from Tramway Ridge has widened understanding of the changing environments that microbial communities on Mt. Erebus live in. The study provides a foundation on which to compare microbial and geochemical interactions across all geothermal sites within Victoria Land. This supports the effect of specific geothermal characteristics of the fumaroles in manipulating the microbial communities present.

year: 2021

title: Late Miocene surface heat flow and thermal modelling of Murchison and southern Taranaki basins, New Zealand

authors: Lee, S.

abstract: Numerical thermal modelling of the successions interescted in Fresne-1, North Tasman-1 and Surville-1, southern Taranaki Basin, establishes a Late Miocene surface heat flow value of 77 ± 6 mWm-2 compared with a present-day value of 70 ± 12 mWm-2. This analysis relies upon 2700 m of Late Miocene – Pliocene erosion at Fresne-1, established by seismic reflection mapping. The use of this Late Miocene surface heat flow value in thermal modelling of the succession in Bounty-1 together with apatite fission track data, establishes a 10 Ma timing for the start of uplift and an c. 8 Ma timing for the start of erosion of the 2700 m of the sedimentary section that formerly overlay the top of the Bounty-1 succession. Murchison and southern Taranaki basins had similar timing (Late Miocene) and duration of hydrocarbon maturation prior to the start of Basin inversion.

text: Late Miocene surface heat flow and thermal modelling of Murchison and southern Taranaki basins, New Zealand Numerical thermal modelling of the successions interescted in Fresne-1, North Tasman-1 and Surville-1, southern Taranaki Basin, establishes a Late Miocene surface heat flow value of 77 ± 6 mWm-2 compared with a present-day value of 70 ± 12 mWm-2. This analysis relies upon 2700 m of Late Miocene – Pliocene erosion at Fresne-1, established by seismic reflection mapping. The use of this Late Miocene surface heat flow value in thermal modelling of the succession in Bounty-1 together with apatite fission track data, establishes a 10 Ma timing for the start of uplift and an c. 8 Ma timing for the start of erosion of the 2700 m of the sedimentary section that formerly overlay the top of the Bounty-1 succession. Murchison and southern Taranaki basins had similar timing (Late Miocene) and duration of hydrocarbon maturation prior to the start of Basin inversion.

year: 2014

title: He whiringa aroha: A mokopuna and a pare in the peabody essex museum

authors: Murray, Moana

abstract: Taonga, Māori ancestral treasures, embody the mana and knowledge of Māori ancestors. He Whiringa Aroha is one such treasure: a carved pare that affirms the mana of wāhine in the colonial archives, but whose whakapapa has been obscured. This thesis uses the name ‘He Whiringa Aroha’ and the te reo Māori pronoun ‘ia’ to refer to ‘E5501’, which is located in the 1806 Richardson collection in the Peabody Essex Museum. As He Whiringa Aroha travelled from Aotearoa New Zealand to Massachusetts, United States, ia became entangled in historical narratives that disembodied the taonga from hapū and iwi Māori. Taonga were not only physically removed from Aotearoa, but taonga and Māori creative practices were named, gendered, and displayed by colonisers. American sailors collected and displayed He Whiringa Aroha as an exotic ‘curiosity’ to showcase their triumph over Pacific waters. Yet, He Whiringa Aroha is a power portal—a potent braid to the past, the future, and to those Māori ways of being that defy the limiting archival language of colonialism. How do we relate to taonga Māori that have been fragmented by the colonial archive? What are alternatives to restory and reclaim taonga that remain in overseas museums? 

Using a creative methodology grounded in Mana Wahine and pūrākau, this thesis weaves a whiri (braid) of aroha (reverence) that attempts to restore he hononga mokopuna–the connection between taonga and their descendants. Through poetry, a decolonial map, interviews with ringatoi (Māori creatives), and archival research, I explore how the histories of taonga can be reclaimed in Māori worldviews. Interviews with pūkenga and tohunga toi reveal Māori understandings of taonga as expressions of toi, defying western taxonomies of ‘art’ and ‘curio’. Furthermore, archival research into the East India Marine Society and Peabody Essex Museum unmasks the American sailors and their provenance practices that
have marginalised Māori, and in particular, wāhine Māori. Finally, I use pūrākau of atua wāhine, Mana Wahine and takatāpui scholarship to restory and rename He Whiringa Aroha. This archival storytelling raises new ethical questions about ownership and kaitiakitanga (guardianship), which pose interventions for existing conversations about the place of taonga Māori in overseas museum collections. Reclaiming the histories of ancestors in museums is more than decolonizing colonial archives; on the contrary, restorying taonga is an act of Indigenous resurgence. This Masters research opens new possibilities to reclaiming takatāpui narratives and the mana of wahine in museum archives.

text: He whiringa aroha: A mokopuna and a pare in the peabody essex museum Taonga, Māori ancestral treasures, embody the mana and knowledge of Māori ancestors. He Whiringa Aroha is one such treasure: a carved pare that affirms the mana of wāhine in the colonial archives, but whose whakapapa has been obscured. This thesis uses the name ‘He Whiringa Aroha’ and the te reo Māori pronoun ‘ia’ to refer to ‘E5501’, which is located in the 1806 Richardson collection in the Peabody Essex Museum. As He Whiringa Aroha travelled from Aotearoa New Zealand to Massachusetts, United States, ia became entangled in historical narratives that disembodied the taonga from hapū and iwi Māori. Taonga were not only physically removed from Aotearoa, but taonga and Māori creative practices were named, gendered, and displayed by colonisers. American sailors collected and displayed He Whiringa Aroha as an exotic ‘curiosity’ to showcase their triumph over Pacific waters. Yet, He Whiringa Aroha is a power portal—a potent braid to the past, the future, and to those Māori ways of being that defy the limiting archival language of colonialism. How do we relate to taonga Māori that have been fragmented by the colonial archive? What are alternatives to restory and reclaim taonga that remain in overseas museums? 

Using a creative methodology grounded in Mana Wahine and pūrākau, this thesis weaves a whiri (braid) of aroha (reverence) that attempts to restore he hononga mokopuna–the connection between taonga and their descendants. Through poetry, a decolonial map, interviews with ringatoi (Māori creatives), and archival research, I explore how the histories of taonga can be reclaimed in Māori worldviews. Interviews with pūkenga and tohunga toi reveal Māori understandings of taonga as expressions of toi, defying western taxonomies of ‘art’ and ‘curio’. Furthermore, archival research into the East India Marine Society and Peabody Essex Museum unmasks the American sailors and their provenance practices that
have marginalised Māori, and in particular, wāhine Māori. Finally, I use pūrākau of atua wāhine, Mana Wahine and takatāpui scholarship to restory and rename He Whiringa Aroha. This archival storytelling raises new ethical questions about ownership and kaitiakitanga (guardianship), which pose interventions for existing conversations about the place of taonga Māori in overseas museum collections. Reclaiming the histories of ancestors in museums is more than decolonizing colonial archives; on the contrary, restorying taonga is an act of Indigenous resurgence. This Masters research opens new possibilities to reclaiming takatāpui narratives and the mana of wahine in museum archives.

year: 2024