@prefix dcat: . @prefix dct: . @prefix foaf: . @prefix xsd: . a dcat:Dataset ; dct:description """#Tranche1: Project 3.5#\r \r ###Management of non-native fish such as catfish may be the answer to safeguarding freshwater taonga (treasured) species in our waterways, researchers have found.###\r \r This project focused on protecting the taonga species kākahi (freshwater mussels) and kōura (crayfish) from pest fish and invasive macrophytes, through a combination of contemporary science and mātauranga (Māori knowledge).""" ; dct:identifier "ef7ce37d-dcb8-458e-8d90-0ae2c9793a0b" ; dct:issued "2024-07-15T01:01:31.251814"^^xsd:dateTime ; dct:modified "2024-08-05T07:16:25.660102"^^xsd:dateTime ; dct:publisher ; dct:title "Managing Threats to Freshwater Taonga Invertebrates" ; dcat:distribution , , , . a dcat:Distribution ; dct:description """###*Echyridella menziesii* (Bivalvia: Hyriidae) as a predator of zooplankton of different sizes; are large non-indigenous *Daphnia* a potential food source?###\r \r **February 2019**\r \r **Pearson AAC, Duggan IC 2019. [*Echyridella menziesii* (Bivalvia: Hyriidae) as a predator of zooplankton of different sizes; are large non-indigenous *Daphnia* a potential food source?](https://www.tandfonline.com/doi/epdf/10.1080/00288330.2019.1570947?needAccess=true) New Zealand Journal of Marine and Freshwater Research 53(3): 327-337.**\r \r **ABSTRACT**\r \r Interactions between two recent invaders to New Zealand, the cladocerans *Daphnia galeata* and* D. pulex*, and native filter-feeding freshwater mussels, are unknown. We examined predation rates of the common native mussel *Echyridella menziesii* (kākahi, kāeo) on non-native *Daphnia* (comparatively large zooplankton in New Zealand), relative to two common native species, the smaller cladoceran *Bosmina meridionalis* and rotifer *Brachionus calyciflorus*. Controlled laboratory experiments were conducted in which each zooplankton species was exposed to bivalve predation for a two-hour period. Comparing treatments to non-mussel controls, removal rates of non-indigenous *D. pulex* and native *B. calyciflorus* were statistically significant. Nevertheless, kākahi removal rates may not be ecologically significant for daphnids (1.7% *D. galeata *and 7.4% *D. pulex*). Kākahi removed 8.8% of *B. meridionalis* and 30.2% of *B. calyciflorus,* suggesting that small, feeble zooplankton species (particularly rotifers) are most susceptible to predation, and potentially function as an energy source for native freshwater mussels.\r \r **KEYWORDS**\r \r Freshwater mussels; *Hyriidae*; zooplankton; *Daphnia*; predation; filtration\r """ ; dct:issued "2024-07-15T01:18:14.450239"^^xsd:dateTime ; dct:modified "2024-07-15T01:18:14.450239"^^xsd:dateTime ; dct:title "PAPER: Echyridella menziesii as a zooplankton predator" ; dcat:accessURL . a dcat:Distribution ; dct:description """###Evaluation of a traditional Māori harvesting method for sampling kōura (freshwater crayfish, *Paranephrops planifrons*) and toi toi (bully, *Gobiomorphus* spp.) populations in two New Zealand streams###\r \r **July 2018**\r \r **Kusabs IA, Hicks BJ, Quinn JM, Perry WL, Whaanga H 2018. [Evaluation of a traditional Maori harvesting method for sampling koura (freshwater crayfish, Paranephrops planifrons) and toi toi (bully, Gobiomorphus spp.) populations in two New Zealand streams](https://www.tandfonline.com/doi/epdf/10.1080/00288330.2018.1481437?needAccess=true). New Zealand Journal of Marine and Freshwater Research 52(4): 603-625.**\r \r **ABSTRACT**\r \r Representative sampling of crayfish in streams is often impractical, especially in non-wadable habitats, or in areas with soft substrates. Whakaweku are artificial habitats made from bracken fern (*Pteridium esculentum*) that can be used successfully in a range of habitats. We compared whakaweku, minnow traps, fyke nets and electrofishing for sampling freshwater crayfish (kōura; *Paranephrops planifrons*) and bullies (toi toi; *Gobiomorphus* spp.) in two streams with differing stream characteristics and fish assemblages.\r \r **KEYWORDS**\r \r Whakaweku; Mātauranga Māori; optimum soak time; representative catch data; freshwater crayfish trap; Bracken fern bundles""" ; dct:issued "2024-07-15T01:05:59.335645"^^xsd:dateTime ; dct:modified "2024-07-15T01:05:59.335645"^^xsd:dateTime ; dct:title "PAPER: Evaluating Māori harvesting method for stream sampling" ; dcat:accessURL . a dcat:Distribution ; dct:description """###Invasive macrophytes induce context‐specific effects on oxygen, pH, and temperature in a hydropeaking reservoir###\r \r **July 2020**\r \r **Moore TP, Clearwater SJ, Duggan IC, Collier KJ 2020. [Invasive macrophytes induce context-specific effects on oxygen,pH, and temperature in a hydropeaking reservoir](https://onlinelibrary.wiley.com/doi/epdf/10.1002/rra.3674). River Research and Applications 36(8): 1717-1729.**\r \r **ABSTRACT**\r \r 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 *Egeria densa* and *Ceratophyllum demersum*, which dominated in the upper-riverine (variable water inflow) and lower-lacustrine (variable water level) sections, respectively. Hypoxia and anoxia events that occurred inside invasive macrophyte beds during their summer peak biomass accumulation period were more pronounced for *C. demersum* than for *E. densa*, and within the bottom 20% of the water column. In contrast, pH and temperature changed little in relation to proportional macrophyte height. Macrophyte species differences in the production of hypoxia and anoxia events increased when site-specific hydropeaking management covariates (depth, inflows, water level) were accounted for. This association with hydropeaking likely resulted from contrasting hydrodynamics in the lower-lacustrine and upper-riverine lake sections, where oxygen can decrease with higher water levels and lower water inflow rates, respectively. During the course of our study, some macrophyte beds were treated with herbicide, enabling us to document prolonged and sustained hypoxic/anoxic conditions near the bottom following spraying. These results underscore the adverse effects of invasive macrophytes on water physicochemical attributes that sustain aquatic biota, and highlight the context-dependent nature of these effects moderated by reservoir management for hydropeaking and macrophyte control.\r \r **KEYWORDS**\r \r anoxia; aquatic plants; herbicide; hypoxia; lake management; littoral zone""" ; dct:issued "2024-07-15T01:28:49.225407"^^xsd:dateTime ; dct:modified "2024-07-15T01:28:49.225407"^^xsd:dateTime ; dct:title "PAPER: Invasive macrophytes impact in hydropeaking reservoir" ; dcat:accessURL . a dcat:Distribution ; dct:description """###Interactions between Unionida and non-native species: A global meta-analysis###\r \r **February 2019**\r \r **Moore TP, Collier KJ, Duggan IC 2019. [Interactions between Unionida and non-native species: A global meta-analysis](https://onlinelibrary.wiley.com/doi/epdf/10.1002/aqc.3040). Aquatic Conservation-Marine and Freshwater Ecosystems 29(9): 1438-1451.**\r \r **ABSTRACT**\r \r 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.\r \r The main non-native groups identified as interacting with unionids were fish (38% of published studies), macrophytes (33%), and vertebrate predators (30%), with ~70% of interactions leading to adverse impacts on mussels. Most studies used field surveys (~50%) and were conducted in rivers (~50%).\r \r Impacts occurred across the unionid life cycle (adult, glochidia, host, and juvenile), and primarily affected processes that determine the transitions between life-cycle stages (fertilization, infestation, settlement, and maturation). The impacts of non-native macrophytes and fish were predicted to be greater for transitional stages than the impact of vertebrate predators, which mostly affected adult mussels.\r \r New Zealand Unionida are most likely to be affected by interactions with non-native species in lowland lakes and waterways, where connectivity for diadromous native fish hosts and high bioinvasion potential intersect.\r \r **KEYWORDS**\r \r *Echyridella*; fish; freshwater mussels; lake; macrophytes; New Zealand; predation; river""" ; dct:issued "2024-07-15T01:14:05.946115"^^xsd:dateTime ; dct:modified "2024-07-15T01:14:05.946115"^^xsd:dateTime ; dct:title "PAPER: Interactions between Unionida and non-native species" ; dcat:accessURL . a foaf:Organization ; foaf:name "Challenge Inventory" .