Wyniki wyszukiwania dla: Ian C. Duggan

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Historical biogeography of the Gondwanan freshwater genus Boeckella (Crustacea): Timing and modes of speciation in the Southern Hemisphere

Claudia S. Maturana, Sebastián Rosenfeld, Elisabeth M. Biersma, Nicolás I. Segovia, więcej

Diversity and Distributions > 27 > 12 > 2330 - 2343

Aim We investigated evolutionary relationships and biogeographical patterns within the genus Boeckella to evaluate (1) whether its current widespread distribution in the Southern Hemisphere is due to recent long‐distance dispersal or long‐term diversification; and (2) the age and origin of sub‐Antarctic and Antarctic Boeckella species, with particular focus on the most widely distributed species:...

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Invasive macrophytes induce context‐specific effects on oxygen, pH, and temperature in a hydropeaking reservoir

Thomas P. Moore, Susan J. Clearwater, Ian C. Duggan, Kevin J. Collier

River Research and Applications > 36 > 8 > 1717 - 1729

Dense macrophyte beds are known to produce extreme diurnal oxygen and temperature conditions in shallow lakes. However their influences in managed hydropeaking reservoirs has received limited attention. We measured dissolved oxygen, pH and water temperature in the Lake Karāpiro hydroreservoir, northern New Zealand, across a gradient of proportional water‐column height occupied by the invasive macrophytes...

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Interactions between Unionida and non‐native species: A global meta‐analysis

Thomas P. Moore, Kevin J. Collier, Ian C. Duggan

Aquatic Conservation: Marine and Freshwater Ecosystems > 29 > 9 > 1438 - 1451

Understanding the multiple agents of decline is important for the conservation of globally threatened Unionida (Class Bivalvia), but threats from non‐native species have received limited attention. To address this gap, a global meta‐analysis was conducted aimed at identifying known interactions and mechanisms of impact and informing potential effect pathways for the New Zealand unionid fauna. The...

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Invertebrates associated with aquatic plants bought from aquarium stores in Canada and New Zealand

Ian C. Duggan, Paul D. Champion, Hugh J. MacIsaac

Biological Invasions > 2018 > 20 > 11 > 3167-3178

Invertebrate species carried incidentally (i.e., ‘hitchhikers’) in the aquarium trade have gained increasing attention in recent years, but factors affecting the movement of species from stores to homes are poorly understood. We aimed to determine how macrophytes bought from stores act as vectors for transport of non-indigenous invertebrate species. We tested whether incidental invertebrate faunas...

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The role of mobile consumers in lake nutrient cycles: a brief review

Simon D. Stewart, David P. Hamilton, W. Troy Baisden, Piet Verburg, więcej

Hydrobiologia > 2018 > 818 > 1 > 11-29

We summarise current understanding of consumer recycling in lake nutrient cycles and expand on it by integrating emerging knowledge from food web ecology. The role of consumer nutrient recycling (CNR) is initially framed in the wider context of lake nutrient cycling, which includes hydrodynamic and biogeochemical processes, and their responses to global environmental change. Case studies are used...

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Variable littoral‐pelagic coupling as a food‐web response to seasonal changes in pelagic primary production

Simon D. Stewart, David P. Hamilton, W. Troy Baisden, Michel Dedual, więcej

Freshwater Biology > 62 > 12 > 2008 - 2025

Lakes are among the most seasonally forced ecosystems on Earth. Seasonal variation in temperature and light produce cyclic patterns in water column mixing, nutrient supply and phytoplankton biomass. Diet responses of consumers to these patterns have rarely been quantified. Moreover, pelagic‐littoral coupling of dietary resources by mobile consumers is commonly considered to be static over annual...

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Constructed treatment wetlands provide habitat for zooplankton communities in agricultural peat lake catchments

Rebecca S. Eivers, Ian C. Duggan, David P. Hamilton, John M. Quinn

Wetlands > 2018 > 38 > 1 > 95-108

Zooplankton are an essential component of healthy functioning lake and wetland ecosystems. Despite this, zooplankton communities within constructed treatment wetlands (CTWs) in agricultural landscapes remain unstudied. Taxa richness, total abundances and community composition were evaluated for zooplankton assemblages from three habitat types (lakes, CTWs and drainage ditches) within five intensive...

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Control of zooplankton populations in a wastewater treatment High Rate Algal Pond using overnight CO2 asphyxiation

Valerio Montemezzani, Ian C. Duggan, Ian D. Hogg, Rupert J. Craggs

Algal Research > 2017 > 26 > C > 250-264

High Rate Algal Ponds (HRAPs) with addition of CO₂ are open pond wastewater treatment systems that recover nutrients as microalgal biomass. Such ponds are vulnerable to contamination by opportunistic zooplankton species able to survive the wastewater HRAP environment. The high food availability and a near neutral pH can promote the rapid development of high densities of zooplankton that can reduce...

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Assessment of potential zooplankton control treatments for wastewater treatment High Rate Algal Ponds

Valerio Montemezzani, Ian C. Duggan, Ian D. Hogg, Rupert J. Craggs

Algal Research > 2017 > 24 > PA > 40-63

Cladocerans and rotifers rapidly consume beneficial microalgae and reduce the performance of High Rate Algal Ponds (HRAPs) for wastewater treatment and algal production. Potential zooplankton control treatments for HRAPs have been proposed and tested at a laboratory scale including CO₂ asphyxiation, biological control using competitor species, filtration, and mechanical disruption using hydrodynamic...

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Screening of potential zooplankton control technologies for wastewater treatment High Rate Algal Ponds

Valerio Montemezzani, Ian C. Duggan, Ian D. Hogg, Rupert J. Craggs

Algal Research > 2017 > 22 > C > 1-13

Zooplankton taxa including cladocerans and rotifers are one of the greatest challenges for effective management of High Rate Algal Ponds (HRAPs) for wastewater treatment as they can establish and rapidly consume beneficial microalgae. Harmful zooplankton need to be controlled using cost effective treatments, and here we tested under controlled laboratory conditions the efficacy of chemical CO₂ asphyxiation,...

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Correspondence between zooplankton assemblages and the Estuary Environment Classification system

Paloma Lucena-Moya, Ian C. Duggan

Estuarine, Coastal and Shelf Science > 2017 > 184 > C > 1-9

We tested whether variability in zooplankton assemblages was consistent with the categories of estuarine environments proposed by the ‘Estuary Environment Classification’ system (EEC) (Hume et al., 2007) across a variety of North Island, New Zealand, estuaries. The EEC classifies estuaries in to eight categories (A to F) based primarily on a combination of three abiotic controlling factors: ocean...

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Do freshwater aquaculture facilities provide an invasion risk for zooplankton hitchhikers?

Ian C. Duggan, Steve G. Pullan

Biological Invasions > 2017 > 19 > 1 > 307-314

While numerous examples exist of freshwater species from aquaculture facilities establishing non-indigenous populations following intentional release, and unintentional escape, clear links between invasions of non-target ‘hitchhiker’ species and this vector are to date are far less convincing. We examined zooplankton from nine New Zealand fish farms, including those with traditional outdoor pond systems,...

artykuł

Zooplankton community influence on seasonal performance and microalgal dominance in wastewater treatment High Rate Algal Ponds

Valerio Montemezzani, Ian C. Duggan, Ian D. Hogg, Rupert J. Craggs

Algal Research > 2016 > 17 > C > 168-184

High Rate Algal Ponds (HRAPs) with artificial addition of CO₂ provide improved tertiary-level wastewater treatment over conventional HRAPs. One of the greatest challenges for performance and management of HRAPs with CO₂ addition is the establishment of zooplankton grazers that can consume much of the algal biomass within a few days. High food availability and a near neutral pH provide optimal conditions...

artykuł

A new, subalpine species of Daphnia (Cladocera, Anomopoda) in the D. carinata species complex, in the South Island, New Zealand

Carolyn W. Burns, Ian C. Duggan, Jonathan C. Banks, Ian D. Hogg

Hydrobiologia > 2017 > 798 > 1 > 151-169

Until recently, only one native and three apparently introduced Daphnia species were known from New Zealand. We demonstrate that (1) Daphnia in subalpine habitats in southern New Zealand differ morphologically and genetically from the native taxon previously labelled Daphnia carinata to merit species nova status and (2) the name of the latter should revert to D. thomsoni, used by Sars (1894) for Daphnia...

artykuł

A review of potential methods for zooplankton control in wastewater treatment High Rate Algal Ponds and algal production raceways

Valerio Montemezzani, Ian C. Duggan, Ian D. Hogg, Rupert J. Craggs

Algal Research > 2015 > 11 > C > 211-226

High Rate Algal Ponds (HRAPs) can provide economical and efficient near tertiary-level wastewater (WW) treatment, with the nutrients recovered as algal biomass. HRAP performance can be negatively affected by the establishment of zooplankton grazers that can consume much of the algal biomass within a few days. Zooplankton management is therefore essential for maintaining WW treatment performance and...

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Connectivity and complexity of floodplain habitats govern zooplankton dynamics in a large temperate river system

Konrad Górski, Kevin J. Collier, Ian C. Duggan, Claire M. Taylor, więcej

Freshwater Biology > 58 > 7 > 1458 - 1470

Large river–floodplain systems are characterised by seasonal flow variability. High flows lead to hydrological connection between the main channel and inundated off‐channel lakes, wetlands and floodplains, which provide essential habitats for riverine biota. We tested the following hypotheses: (i) that crustacean zooplankton are more abundant in connected lentic habitats such as riverine lakes and...

artykuł

Are zooplankton invasions in constructed waters facilitated by simple communities?

Samantha M. Parkes, Ian C. Duggan

Diversity and Distributions > 18 > 12 > 1199 - 1210

AimConstructed water bodies (e.g. water supply and hydroelectricity dams, ornamental ponds) are invaded at faster rates than natural waters, but the mechanisms that lead to this pattern are uncertain. We aimed to determine whether constructed lakes have lower zooplankton species richness or differ in species composition relative to natural waters, which might allow them to be invaded more readily...

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Can biotic resistance be utilized to reduce establishment rates of non-indigenous species in constructed waters?

Claire M. Taylor, Ian C. Duggan

Biological Invasions > 2012 > 14 > 2 > 307-322

Understanding the mechanisms that facilitate establishment of non-indigenous species is imperative for devising techniques to reduce invasion rates. Passively dispersing non-indigenous organisms, including zooplankton, seemingly invade constructed waters (e.g., ornamental ponds, dams and reservoirs) at faster rates than natural lakes. A common attribute of these invaded water bodies is their relatively...

artykuł

Urban planning provides potential for lake restoration through catchment re-vegetation

Ian C. Duggan

Urban Forestry & Urban Greening > 2012 > 11 > 1 > 95-99

Encroachment of urban areas into forest and farmland is typically considered to have detrimental effects on terrestrial and aquatic ecosystems. Most restoration strategies for lakes affected by urban development represent expensive short-term fixes requiring on-going management, with long-term restoration requiring external nutrient inputs (typically the major impact of urban development) to be significantly...

artykuł

Predicting the effects of climate change on trophic status of three morphologically varying lakes: Implications for lake restoration and management

Dennis Trolle, David P. Hamilton, Conrad A. Pilditch, Ian C. Duggan, więcej

Environmental Modelling and Software > 2011 > 26 > 4 > 354-370

To quantify the effects of a future climate on three morphologically different lakes that varied in trophic status from oligo-mesotrophic to highly eutrophic, we applied the one-dimensional lake ecosystem model DYRESM-CAEDYM to oligo-mesotrophic Lake Okareka, eutrophic Lake Rotoehu, both in the temperate Bay of Plenty region, and highly eutrophic Lake Ellesmere, in the temperate Canterbury region,...

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