The granting of rights to the Whanganui River in 2017 emerged as an outcome of Tribunal hearings relating to breaches of the Treaty of Waitangi, signed between Māori chiefs and the British Crown in 1840. As this expression of a river as having legal personhood with rights reflects a distinctively Māori perspective upon river systems, it offers the prospect for a new era of sociocultural approaches to river management in Aotearoa New Zealand. Using the Whanganui River as a case study, this paper explores prospective geomorphic meanings of river rights. The paper asks, “What role can geomorphology play in identifying, articulating and protecting the rights of a river?” Ancestral Māori relations to the river based upon mutual codependence (reciprocity) are juxtaposed against geomorphic understandings of a river's agency as expressed through self‐adjustment, diversity of form, evolution, and catchment‐scale connectivities. Relations between river science and indigenous concepts of rivers, framed under the auspices of river rights, present opportunities for different approaches to river management.
Lakes are becoming degraded at an accelerating rate owing to human activity, and understanding their past ecology is necessary for lake management and rehabilitation. Palaeolimnology provides numerous methods that enable the historical state of lakes to be determined. New Zealand provides an ideal setting in which to do this as human modification of the landscape occurred later here than in most regions of the world (approx. 1300 CE). Lake Oporoa is a shallow lake that is highly significant to the local indigenous Māori community. This study used multiple proxy palaeolimnology to explore how lake ecology shifted following Māori and European settlement in the catchment, and how palaeolimnological data can be used to inform lake rehabilitation and conservation measures, alongside the desires of the indigenous community. Sedimentary pollen, diatoms, bacterial communities, and elemental and hyperspectral imaging scanning were used to infer ecological changes in the lake and catchment from pre‐human times to present. Following Māori settlement (approx. 1620 CE) there was gradual vegetation change and a rapid shift in diatom and bacterial assemblages, but not in phytoplankton pigments or sediment geochemistry. An increasing abundance of diatom taxa Discostella stelligera and Staurosirella cf. ovata indicates early nutrient enrichment. European pastoralism from approximately 1840 CE resulted in further deforestation, and all proxies show evidence for enhanced primary productivity driven by a combination of nutrient enrichment and changing lake levels, particularly since the 1960s. This has caused degradation in water quality and is likely to have contributed to the decline in populations of tuna (eel, Anguilla spp.). Conversations with local Māori, together with the palaeolimnological results, indicate that a culturally acceptable and realistic rehabilitation target for Lake Oporoa aligns with ecological conditions in the 1950s. The palaeoecological data provide information to guide catchment and lake revegetation and other methods of nutrient abatement, with the eventual aim of restoring culturally important tuna and native fish populations.
Environmental valuation provides a way of soliciting and organising information about how people relate to their environments. By canvassing a broad spectrum of human–nature relationships, valuation practice seeks to make environmental decision‐making more inclusive of diverse human concerns and aspirations. When valuation is undertaken in real‐world decision‐making settings, choices must be made about how to adapt valuation into context. Generic guidance illuminates choices of theory and method, as well as practical issues such as cost and complexity; however, little guidance exists on how to understand and respond to the political implications of valuation in places. To address this, we develop four propositions on how valuation intervenes into conflicted environmental decision‐making contexts, drawing on interviews with government officials and marine values‐holders from Aotearoa New Zealand's Marlborough Sounds. Valuation intervenes in politics by (i) vesting certain scales and actors with authority, (ii) aligning with or contesting existing regulatory categories, (iii) reallocating expertise about the environment and (iv) reproducing or reworking the uneven playing field of decision‐making. Understanding these implications can support valuation practitioners to situate their work within locally relevant contexts and objectives. These propositions provide a way of grasping the mechanisms through which valuation intervenes in local political struggles for environmental authority. Using these prompts, and developing others, can help valuation practitioners to ‘do good’ through seeking place‐based environmental justice and sustainability. A free Plain Language Summary can be found within the Supporting Information of this article.
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