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The Ecological and Socio-Cultural Values of Estuarine Shellfisheries in Hawai`I and Aotearoa New Zealand

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The Ecological and Socio-Cultural Values of Estuarine Shellfisheries in Hawai`I and Aotearoa New Zealand ‘Mauka makai’ ‘Ki uta ki tai’: The ecological and socio-cultural values of estuarine shellfisheries in Hawai`i and Aotearoa New Zealand. Ani Alana Kainamu Murchie Ngāpuhi, Ngāti Kahu ki Whangaroa, Cunningham Clan A thesis submitted in fulfilment of the requirements for the degree of Doctor of Philosophy in Environmental Science, The University of Canterbury 2017 Abstract Estuaries rank among the most anthropogenically impacted aquatic ecosystems on earth. There is a growing consensus on anthropogenic impacts to estuarine and coastal environments, and consequently the ecological, social, and cultural values. The protection of these values is legislated for within the U.S. and Aotearoa New Zealand (NZ). The respective environmental catchment philosophy ‘Mauka Makai’ and ‘Ki Uta Ki Tai’ (lit. inland to sea) of Indigenous Hawaiian and Ngāi Tahu forms the overarching principle of this study. The scientific component of this study measured shellfish population indices, condition index, tissue and sediment contamination which was compared across the landscape development index, physico-chemical gradient and management regimes. Within the socio-cultural component of this study, Indigenous and non-Indigenous local residents, ‘beach-goers’, managers, and scientists were interviewed towards their perception and experience of site and catchment environmental condition, resource abundance and changes, and management effectiveness of these systems. Both the ecological and cultural findings recognised the land as a source of anthropogenic stressors. In Kāne`ohe Bay, Hawai`i, the benthic infaunal shellfish density appears to be more impacted by anthropogenic conditions compared with the surface dwelling Pacific oyster, Crassostrea gigas. The latter was indicative of environmental condition. Although the shellfish fishery has remained closed since the 1970s, clam densities have continued to decline. This is the first C. gigas population survey, showing variabile distiribution, the highest abundance located at urban residential piers. The clam-bed sediment contamination concentrations exceeded the Sediment Quality Guidelines and were comparable to findings in the U.S. This requires further investigation by local authorities. Lower C. gigas condition index was associated with elevated tissue arsenic concentration. Native fish and plant life (limu) rather than shellfish were important species to harvest/gather in Kāne`ohe Bay. However, active shellfish culturing was currently being trialled or commercially operated, while the recreationally fishery has been closed for > 30 years. Introduced fishery pressures and landscape development were highlighted as key issues in the Bay. Kānaka Maoli fishery practices and traditional management systems were responses to perceived decline in native fisheries. Extensive restoration efforts were occurring in Hawai`i that may aid to reduce anthropogenic input. Interview analysis was limited by low sample size. ‘Mauka makai’ and local fishery-ecology management systems were recommended by more experienced (>20 yrs) Indigenous and non-Indigenous participants. In Canterbury, New Zealand, the New Zealand littleneck clam, Austrovenus stutchburyi, was indicative of environmental condition, while the pipi, Paphies australis, was only abundant at one site, ii and the dredge oyster Tiostrea chilensis were sparse and without individuals of harvestable sizes. The A. stutchburyi condition index was positively influenced by salinity and negatively with tissue Metal Pollution Index (MPI), tissue E. coli, and sediment MPI. The A. stutchburyi density negatively correlated with both tissue and sediment metal concentrations. Additionally, tissue inorganic arsenic and tissue E. coli concentrations exceeded the guidance for human consumption. The latter exceeded multiple times, and included low salinity sites at the urban and high-intensity rural estuary. Sites of elevated contaminants shared similarities that can further guide monitoring and restoration efforts. The top environmental indicators provided by interview participants aligned with the known global stressors within estuaries. The values of Ngāi Tahu were compromised more often than other cultural affiliations in New Zealand. Ngāi Tahu fishery practices and restoration efforts have responded to perceived decline in native fisheries. ‘Inland-to-sea’ management systems were recommended by Indigenous and non-Indigenous environmental specialists. The anthropogenic impacts of stressors on estuarine systems requires ongoing assessments of environmental condition, and effects on ecological and cultural values. iii Acknowledgements Haere rā e ngā karangataha maha, hoki atu ki ō mātua, o koutou tīpuna, he tohu maumahara tēnei kia Papa Matiu & Nan Te Waihemonga (nee Kainamu) Eramiha, kua ngaro atu ki te pō. Kāore kau ngā kupu hei whakatinanahia i tā mātou aroha māu. Ko te hunga mate ki te hunga mate, ko te hunga ora ki te hunga ora. Tēna tātou katoa. Ngā mihi aroha kia Rupert Ihaia Murchie, tōku pou whirinaki, he waimarie ahau he hoa rangatira koe māku. Many thanks to my senior supervisor Dr. Islay Marsden, Dr. Sally Gaw, Dr. John Pirker, and mentor Dr. Te Maire Tau for the opportunity to undertake this multidisciplinary PhD research within Environmental Sciences and the Ngāi Tahu Research Center. Thank you to my advisor at HPU, Dr. Susan Carstenn, for your support while researching in O`ahu, Hawai`i. I would like to especially acknowledge Ngāi Tahu Research Center for the Doctoral Scholarship, mentorship, and the invaluable lessons gained within the First Nations Futures Program. I would like to express thanks to Fulbright New Zealand for providing this cross-nation and cultural exchange with America and Hawai`i. Thank you to the following organisations who provided funding towards the costs of laboratory and field costs: the Lois Endowment (2014), Te Tapuae o Rehua ESR (2015), and Te Kōhanga Reo National Trust/Tā Hemi Henare grant (2016). I acknowledge Kānaka Maoli and Ngāi Tahu individuals and groups for your mentorship and teachings within Indigenous Ecological Knowledge, your wisdom beautifully captured within the following proverbs: Mō apōpō, ā mō kā uri whakaheke1 (Ngāi Tahu) He ali`i ka `āina, he kauwā ke kanaka2 (Pukui 1983) Hawai`i There are many who have also contributed from technical work to socio-political philosophy. I would like to thank Jan MacKenzie for your technical assistance for field and lab work. To Rob Stainthorpe (ICP-MS) for your technical work within Chemistry, and to Rob Spiers for access to the Geology equipment. Thank you also to Nigel Harris for sharing your experience and knowledge. Kia koe tonu e hoa, Kelly Ratana, e hāpai ana ahau mai O`ahu tae noa mai ki te kāinga nei o Aotearoa, kāore ngā kupu hei whakatinanahia i tāu nā mahi hei tautokohia i ahau. Ngā mihi nui kia koutou katoa. 1 “For tomorrow, and for our descendants who follow” 2 “The land is a chief; man is its servant” iv Table of Contents Abstract ................................................................................................................................................... ii Acknowledgements ................................................................................................................................ iii List of Figure ...........................................................................................................................................iv List of Tables ........................................................................................................................................ viii Preface, writing convention ................................................................................................................... xii Glossary ................................................................................................................................................ xiii Chapter 1 General introduction ............................................................................................................ 1 Background .......................................................................................................................................... 3 Thesis scope and objectives ............................................................................................................... 10 Chapter 2 General methodology ......................................................................................................... 11 Socio-cultural survey .......................................................................................................................... 11 Landscape development intensity (LDI) index .................................................................................. 13 Ecological evaluation ......................................................................................................................... 15 Contaminant analysis ......................................................................................................................... 16 Statistical analysis .............................................................................................................................. 18 Chapter 3 The socio-cultural values of shellfisheries in Hawai`i ..................................................... 21 Introduction ........................................................................................................................................ 21 Methods .............................................................................................................................................
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