title: Low-dose alum application trialled as a management tool for internal nutrient loads in Lake Okaro, New Zealand

authors: Paul, Wendy J.

subjects: flocculation

abstract: Aluminium sulfate (alum) was applied to Lake Okaro, a eutrophic New Zealand lake with recurrent cyanobacterial blooms, to evaluate its suitability for reducing trophic status and bloom frequency. The dose yielded 0.6 g aluminium m–3 in the epilimnion. Before dosing, pH exceeded 8 in epilimnetic waters but was optimal for flocculation (6–8) below 4 m depth. After dosing, there was no significant change in water clarity, hypolimnetic pH decreased to 5.5, and soluble aluminium exceeded recommended guidelines for protection of freshwater organisms. Epilimnetic phosphate concentrations decreased from 40 to 5 mg m–3 and total nitrogen (TN):total phosphorus (TP) mass ratios increased from 7:1 to 37:1. The dominant phytoplankton species changed from Anabaena spp. before dosing, to Ceratium hirudinella , then Staurastrum sp. after dosing. Detection of effectiveness of dosing may have been limited by sampling duration and design, as well as the low alum dose. The decrease in hypolimnetic pH and epilimnetic TP, and increase in Al3+ and chlorophyll a, are attributed to the low alkalinity lake water and coincidence of alum dosing with a cyanobacterial bloom and high pH.

text: Low-dose alum application trialled as a management tool for internal nutrient loads in Lake Okaro, New Zealand Aluminium sulfate (alum) was applied to Lake Okaro, a eutrophic New Zealand lake with recurrent cyanobacterial blooms, to evaluate its suitability for reducing trophic status and bloom frequency. The dose yielded 0.6 g aluminium m–3 in the epilimnion. Before dosing, pH exceeded 8 in epilimnetic waters but was optimal for flocculation (6–8) below 4 m depth. After dosing, there was no significant change in water clarity, hypolimnetic pH decreased to 5.5, and soluble aluminium exceeded recommended guidelines for protection of freshwater organisms. Epilimnetic phosphate concentrations decreased from 40 to 5 mg m–3 and total nitrogen (TN):total phosphorus (TP) mass ratios increased from 7:1 to 37:1. The dominant phytoplankton species changed from Anabaena spp. before dosing, to Ceratium hirudinella , then Staurastrum sp. after dosing. Detection of effectiveness of dosing may have been limited by sampling duration and design, as well as the low alum dose. The decrease in hypolimnetic pH and epilimnetic TP, and increase in Al3+ and chlorophyll a, are attributed to the low alkalinity lake water and coincidence of alum dosing with a cyanobacterial bloom and high pH.

year: 2008

title: That 'austere anti-aesthetic angel': James K. Baxter and Puritanism

authors: Moffat, Kirstine

abstract: It is necessary to begin with an apology to James K. Baxter. In my previous musings on the Puritan legacy in New Zealand I have chastised Baxter, along with other writers and critics of his generation, for using Puritanism as a reductive catchphrase to summarise all that they most despise about New Zealand society (Moffat, 'Destruction'). The phrase that I have repeatedly used to epitomise Baxter's perceived antagonism is his description of Pu,itanism as an 'austere anti-aesthetic angel' (Complete Prose 2. 328). Returning to this phrase as I meditate at much greater length on Baxter's relationship with Puritanism, I realise that I am guilty of flattening and simplifying what is a much more complex engagement with Puritanism in his prose writing. Baxter's phrase contains both condemnation and implied praise. He was vehemently opposed to what he regarded as the Puritan suspicion of imagination and sexuality, and throughout his writing castigated all the social and religious forces that sought to curb and quell aestheticism and the natural, instinctual self. Yet, he also refers to Puritanism as 'austere', a quality that much of his writing and his own life choices suggest he regarded as admirable, particularly as it relates to a paring back and relinquishing of the unnecessary paraphernalia of capitalism and materialism. And what to make of 'angel'? Surely this is more than simply alliterative effect. It too undercuts the antagonism of 'anti-aesthetic' to suggest that in Baxter's eyes there is at least a trace of the divine about Puritanism and its legacy.

text: That 'austere anti-aesthetic angel': James K. Baxter and Puritanism It is necessary to begin with an apology to James K. Baxter. In my previous musings on the Puritan legacy in New Zealand I have chastised Baxter, along with other writers and critics of his generation, for using Puritanism as a reductive catchphrase to summarise all that they most despise about New Zealand society (Moffat, 'Destruction'). The phrase that I have repeatedly used to epitomise Baxter's perceived antagonism is his description of Pu,itanism as an 'austere anti-aesthetic angel' (Complete Prose 2. 328). Returning to this phrase as I meditate at much greater length on Baxter's relationship with Puritanism, I realise that I am guilty of flattening and simplifying what is a much more complex engagement with Puritanism in his prose writing. Baxter's phrase contains both condemnation and implied praise. He was vehemently opposed to what he regarded as the Puritan suspicion of imagination and sexuality, and throughout his writing castigated all the social and religious forces that sought to curb and quell aestheticism and the natural, instinctual self. Yet, he also refers to Puritanism as 'austere', a quality that much of his writing and his own life choices suggest he regarded as admirable, particularly as it relates to a paring back and relinquishing of the unnecessary paraphernalia of capitalism and materialism. And what to make of 'angel'? Surely this is more than simply alliterative effect. It too undercuts the antagonism of 'anti-aesthetic' to suggest that in Baxter's eyes there is at least a trace of the divine about Puritanism and its legacy.

year: 2017

title: Te Piringa

authors: Dickson, Matiu

abstract: Māori have an oral tradition, that is, the transfer of knowledge within and between generations, which was carried out orally by way of story-telling or the more formal speech-making. Ngā korero purākau are the stories and whaikōrero is formal talking on the marae or ancestral gathering places of Māori people. The value of public speaking is expressed in the saying: Ko te kōrerote kai a te Rangatira – (The chiefs thrive on talking and debating). This article looks at the transfer of knowledge to the next generation.

text: Te Piringa Māori have an oral tradition, that is, the transfer of knowledge within and between generations, which was carried out orally by way of story-telling or the more formal speech-making. Ngā korero purākau are the stories and whaikōrero is formal talking on the marae or ancestral gathering places of Māori people. The value of public speaking is expressed in the saying: Ko te kōrerote kai a te Rangatira – (The chiefs thrive on talking and debating). This article looks at the transfer of knowledge to the next generation.

year: 2010