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Larvae (glochidia) of Unionida mussels form obligate symbiotic associations with host fish to complete their life‐cycle. To identify previously unknown host fish associations for the threatened New Zealand Echyridella aucklandica , glochidia infestation on fish by two mussel species was quantified in four Waikato streams. A host for E. aucklandica was identified for the first time, with glochidia found to attach and encyst on...
Congruence in stable isotope values among two sympatric freshwater mussel species in northern New Zealand streamsNARA Subscribed
We measured δ 15 N, δ 13 C, and percent carbon (C) and nitrogen (N) on foot and remaining soft tissue of the two native freshwater mussel species Echyridella aucklandica and E. menziesii (Hyriidae: Unionida) from three Waikato, northern New Zealand, streams to investigate differences among sites, sexes and species. Mean differences in δ 15 N and δ 13 C between foot and remaining soft tissue (mainly guts, gills and gonads) were...
Ponds are increasingly being constructed to enhance amenity values in human‐dominated lowland landscapes, but little is known of design features that influence macroinvertebrates which can provide important food resources for fish and waterbirds. We quantified pond characteristics, sampled benthic and water‐column macroinvertebrates in winter, and related abundance, biomass and community composition to characteristics of 34 po...
We characterised the quantity (mass per unit area or volume), quality (cabon:nitrogen ratio) and enrichment (δ 15 N) of basal food resources and benthic macroinvertebrates in six shallow lakes in the Waikato region, New Zealand, to elucidate patterns related to lake type (peat, riverine), habitat (littoral, mid‐lake) and enrichment status (Trophic Level Index >6 or ≤5). Total seston dry mass was dominated by fine material that...
Motivation The BioTIME database contains raw data on species identities and abundances in ecological assemblages through time. These data enable users to calculate temporal trends in biodiversity within and amongst assemblages using a broad range of metrics. BioTIME is being developed as a community‐led open‐source database of biodiversity time series. Our goal is to accelerate and facilitate quantitative analysis of temporal...
Factors influencing biodeposit production by the New Zealand freshwater mussel Echyridella menziesiiNARA Subscribed
Laboratory experiments on the New Zealand freshwater mussel Echyridella menziesii were used to investigate the short‐term effects (7–8 days) of food type on rates of biodeposition and benthic substrate respiration. Post‐feeding biodeposition rates ranged from 0.34 to 1.52 mg g −1 h −1 (mean = 0.50 mg g −1 h −1 ) and were unaffected by the addition of toxin‐producing Microcystis . Addition of suspended sediment (30 mg L −1 ) vi...
Littoral and benthic macroinvertebrate community responses to contrasting stressors in a large New Zealand riverNARA Subscribed
Large rivers present major challenges for biomonitoring and the development of biocriteria because of difficulties obtaining samples representative of the range of habitats present and a paucity of information on taxa responses to environmental conditions. We sampled littoral and deepwater benthic habitats to investigate macroinvertebrate community composition associated with organic, sediment and heated water discharges at 22...
A standardised sampling protocol for robust assessment of reach‐scale fish community diversity in wadeable New Zealand streamsNARA Subscribed
The New Zealand fish fauna contains species that are affected not only by river system connectivity, but also by catchment and local‐scale changes in landcover, water quality and habitat quality. Consequently, native fish have potential as multi‐scale bioindicators of human pressure on stream ecosystems, yet no standardised, repeatable and scientifically defensible methods currently exist for effectively quantifying their abun...
Mussel spat ropes provide passage for banded kokopu ( Galaxias fasciatus ) in laboratory trialsNARA Subscribed
The use of mussel spat ropes to enable the passage of banded kokopu ( Galaxias fasciatus ) past perched culverts was tested under laboratory conditions. A 0.5 m high simulated perched culvert was fitted with one of two UV stabilised polypropylene rope types: “Russet Loop” and “Super Xmas Tree”. Four randomised replicate trials using each rope type were conducted to test their respective abilities to provide passage for “fresh‐...
Average score per metric: An alternative metric aggregation method for assessing wadeable stream healthNARA Subscribed
Integrating multiple metrics derived from stream macroinvertebrate communities into single scores that reflect ecological condition can bridge the needs of multiple groups using biomonitoring data. Macroinvertebrate metrics from 511 Waikato, New Zealand, stream samples were standardised by their maximum observed value. Metric redundancy and optimisation processes identified three standardised metrics from an initial set of 17...
Spatial patterns in the composition of shallow‐water macroinvertebrate communities of a large New Zealand riverNARA Subscribed
Identifying the environmental factors influencing biotic patterns in large rivers will assist with extrapolating biological monitoring results to broader scale conclusions about river condition. In the present study, we collected macroinvertebrates and physico‐chemical data at 47 shallow‐water (
Population‐genetic structure in the New Zealand caddisfly Orthopsyche fimbriata revealed with mitochondrial DNANARA Subscribed
Nucleotide sequences of 422 base pairs of the cytochrome c oxidase subunit I (COI) gene were used to assess phylogeographic structure in the New Zealand hydropsychid caddisfly Orthopsyche fimbriata. A hierarchical examination of populations from 16 streams at different spatial scales in the central and northern North Island of New Zealand found 23 haplotypes. Most regions were characterised by unique haplotypes with geneticall...