Browsing by Series "Proceedings of LakesWater Quality Society 2015"
Now showing items 1-20 of 34
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Biocontrol of aquatic weeds
(LakesWater Quality Society, 2015)Current control methods for aquatic weeds in New Zealand include mechanical control, herbicides and inundative biological control using sterile grass carp as well as habitat manipulation and integrated control. These options ... -
Biosecurity management overview
(LakesWater Quality Society, 2015)Today’s symposium topic is the issue of water weeds in the Rotorua Lakes and their management. I will discuss how and where these weeds came from and how they got into New Zealand. The weeds discussed are only a small ... -
Busting myths on water weeds
(LakesWater Quality Society, 2015)Troublesome aquatic weeds have been an issue for the Rotorua Te Arawa Lakes for decades, but what do we really know about what drives water weed problems? Some common held beliefs about water weeds are ‘one weed is as bad ... -
The changing face of Lake Okataina’s ‘phosphorus scape’: Who is the culprit?
(LakesWater Quality Society, 2015)Lake sediments contain a great wealth of data on biogeochemical and limnological processes of historical importance, which can be used to interpret natural ecosystem dynamics, and climatic and anthropogenic impacts. In ... -
Closing comments: Rotorua Lakes Symposium 2015
(LakesWater Quality Society, 2015)Closing comments: Rotorua Lakes Symposium 2015 -
Control of pests in Lake catchments – the Department of Conservation’s perspective
(LakesWater Quality Society, 2015)A key part of the Department of Conservation’s (DOC) work is to ensure the diversity of New Zealand’s natural heritage is maintained and restored. However, is a huge task and DOC’s resources cannot stretch to do everything ... -
Crown perspective
(LakesWater Quality Society, 2015)My primary role this morning is to give an overview of Government policy direction around freshwater management; to reflect on where we are after our 7 years in government, and to give a bit of a steer on my new challenges ... -
Current state of the Rotorua Lakes
(LakesWater Quality Society, 2015)The Rotorua Te Arawa Lakes’ programme of restoration has arguably been the most ambitious and effective of any for a group of lakes around the world. It has been characterised by willingness to ‘try things’, to be guided ... -
Dama Wallabies: Their history of colonization and control at Okataina/Tarawera
(LakesWater Quality Society, 2015)Dama wallabies (Macropus eugenii) were liberated near the southern end of Lake Okareka in 1912. By the 1970s their numbers had built to high levels in the forests surrounding Okareka, Okataina and Tarawera and the damage ... -
An ecological perspective on ‘undisturbed’ lake catchments in the Rotorua District
(LakesWater Quality Society, 2015)There is currently concern about trends in water quality in some lakes in largely natural catchments. Various potential contributing causes are under consideration, including pest animals, such as wallabies, and pest plants. ... -
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The importance of restoring the Rotorua Lakes
(LakesWater Quality Society, 2015)In November last year the Rotorua District Council resolved to change our trading name to Rotorua Lakes Council. This was passed at Council and caused a stir; everything I do seems to cause a stir because we did not consult ... -
The link between erosion, phosphorus and water quality
(LakesWater Quality Society, 2015)In lakes, the solubility of phosphorus (P) in water, and therefore its availability to aquatic plants (macrophytes and algae) for growth, is controlled by oxygen and pH. The supply of dissolved reactive P (DRP) to the lake ... -
New Zealand’s indigenous forests – their status and drivers of change
(LakesWater Quality Society, 2015)New Zealand’s remaining indigenous forests and shrublands are of immense cultural, environmental, and economic significance. A representative plot-based sample of these forests and shrublands has recently allowed an unbiased ... -
Perspective of a consultant and contractor
(LakesWater Quality Society, 2015)Pest management can be a very polarising issue. Every pest management operation is different, reflecting variations in terrain, accessibility, ecology, the types of pests present and the nature and scale of previous pest ... -
Potential Lake Rotorua scenarios
(LakesWater Quality Society, 2015)Lakes need weeds, good ones (native species) not bad (invasive exotic species), although even exotic species are better than no weeds. Without aquatic macrophytes, a lake can become phytoplankton dominated with low clarity ... -
Programme: Rotorua Lakes Symposium 2015
(LakesWater Quality Society, 2015)Programme of Rotorua Lakes Symposium 2015 -
Purpose of weed harvesting
(LakesWater Quality Society, 2015)Harvesting is one potential option to control nuisance growths of lake weeds. Mechanical harvester units can typically remove lake weed to 2-3m below the water surface. Yet common weed species in NZ lakes often grow to ... -
Recognising the negative impacts of aquatic weed management: Okawa Bay, Lake Rotoiti case study
(LakesWater Quality Society, 2015)The Te Arawa Rotorua Lakes Programme continues to implement measures to maintain and restore lake water quality in line with trophic level indices (TLI’s) for respective lakes. In Lakes Rotorua and Rotoiti this has also ... -
Responsibilities and funding – consenting pathways and options
(LakesWater Quality Society, 2015)This presentation will outline the regulatory framework for biosecurity programmes within the Rotorua Lakes and explore a range of potential options for tackling the framework, drawing on my experiences with collaborative ...
