title: Turning a negative into a positive: Aquatic weed harvesting Lake Rotoehu

authors: Mallinson, Richard

abstract: The submerged aquatic weed hornwort (Ceratophyllum demersum) has become widespread through Lake Rotoehu since its establishment in the lake around 2000. This exotic pest plant is surface reaching in large parts of this shallow lake making it a perfect candidate for mechanical harvesting.
As part of the Te Arawa - Rotorua Lakes Programme the Lake Rotoehu Action Plan sets out nutrient reduction targets for nitrogen and phosphorus. Realising these targets is integral if lake water quality is to be restored to the trophic level index (TLI) target for Lake
Rotoehu. Restoration measures have included land use management efforts to arrest nutrient inputs, phosphorus locking through alum dosing, floating wetlands, and most recently the deployment of two aerators. To date the most successful in-lake nutrient reduction method has been mechanical harvest of hornwort.
Aquatic weed harvesting has resulted in reaching a significant portion of the annual nutrient target for the lake catchment. Attaining this level of nutrient removal has manifested in tangible water quality gains in the past few years. Most noticeable is the reduction in cyanobacterial (blue-green) algal blooms which had been prevalent in the lake in summer months. We discuss the practicalities and problems of submerged lake weed harvesting, disposal options, and impacts of this activity on the lake.

text: Turning a negative into a positive: Aquatic weed harvesting Lake Rotoehu The submerged aquatic weed hornwort (Ceratophyllum demersum) has become widespread through Lake Rotoehu since its establishment in the lake around 2000. This exotic pest plant is surface reaching in large parts of this shallow lake making it a perfect candidate for mechanical harvesting.
As part of the Te Arawa - Rotorua Lakes Programme the Lake Rotoehu Action Plan sets out nutrient reduction targets for nitrogen and phosphorus. Realising these targets is integral if lake water quality is to be restored to the trophic level index (TLI) target for Lake
Rotoehu. Restoration measures have included land use management efforts to arrest nutrient inputs, phosphorus locking through alum dosing, floating wetlands, and most recently the deployment of two aerators. To date the most successful in-lake nutrient reduction method has been mechanical harvest of hornwort.
Aquatic weed harvesting has resulted in reaching a significant portion of the annual nutrient target for the lake catchment. Attaining this level of nutrient removal has manifested in tangible water quality gains in the past few years. Most noticeable is the reduction in cyanobacterial (blue-green) algal blooms which had been prevalent in the lake in summer months. We discuss the practicalities and problems of submerged lake weed harvesting, disposal options, and impacts of this activity on the lake.

year: 2015

title: Taku haumaru me te kurī: He aratohu mō te haumaru i waenga i te tamariki (8-9 pea ngā tau) me te kurī - Te Reo Maori

authors: Carter, Jennifer

subjects: dog safety tips

abstract: This safety booklet for older children (about 8-9yrs) will provide the best level of understanding of how to avoid pet dog attacks which can injure, maim and even kill children. This research-based educational resource provides practical, valid and reliable guidelines for safe interaction between children and pet dogs in their homes or known to them. The content of this booklet has been drawn from ‘Stories with happy endings: Preventing pet dog attacks on children’, the 2007-2008 Summer Scholarship report prepared for the Child Accident Prevention Foundation of New Zealand (CAPFNZ). Obtain a copy of the report from http://hdl.handle.net/10289/768

text: Taku haumaru me te kurī: He aratohu mō te haumaru i waenga i te tamariki (8-9 pea ngā tau) me te kurī - Te Reo Maori This safety booklet for older children (about 8-9yrs) will provide the best level of understanding of how to avoid pet dog attacks which can injure, maim and even kill children. This research-based educational resource provides practical, valid and reliable guidelines for safe interaction between children and pet dogs in their homes or known to them. The content of this booklet has been drawn from ‘Stories with happy endings: Preventing pet dog attacks on children’, the 2007-2008 Summer Scholarship report prepared for the Child Accident Prevention Foundation of New Zealand (CAPFNZ). Obtain a copy of the report from http://hdl.handle.net/10289/768

year: 2008

title: Algebraic Properties of Chromatic Polynomials and Their Roots

authors: Gilmore, Hamish Julian

subjects: chromatic

abstract: In this thesis we examine chromatic polynomials from the viewpoint of algebraic number theory. We relate algebraic properties of chromatic polynomials of graphs to structural properties of those graphs for some simple families of graphs. We then compute the Galois groups of chromatic polynomials of some sub-families of an infinite family of graphs (denoted {Gp,q }) and prove a conjecture posed in [15] concerning the Galois groups of one specific sub-family. Finally we investigate a conjecture due to Peter Cameron [8] that says that for any algebraic integer α there is some n ∈ ℕ such that α + n is the root of some chromatic polynomial. We prove the conjecture for quadratic and cubic integers and provide strong computational evidence that it is true for quartic
and quintic integers.

text: Algebraic Properties of Chromatic Polynomials and Their Roots In this thesis we examine chromatic polynomials from the viewpoint of algebraic number theory. We relate algebraic properties of chromatic polynomials of graphs to structural properties of those graphs for some simple families of graphs. We then compute the Galois groups of chromatic polynomials of some sub-families of an infinite family of graphs (denoted {Gp,q }) and prove a conjecture posed in [15] concerning the Galois groups of one specific sub-family. Finally we investigate a conjecture due to Peter Cameron [8] that says that for any algebraic integer α there is some n ∈ ℕ such that α + n is the root of some chromatic polynomial. We prove the conjecture for quadratic and cubic integers and provide strong computational evidence that it is true for quartic
and quintic integers.

year: 2015