Subsurface flow within a single riffle of low‐gradient gravel bed stream was modeled in three dimensions using MODFLOW, finite difference groundwater model. Model simulations showed that exchange flows can only occur this low‐gradient, gaining because zone alluvial sediment around the has much higher permeability than surrounding catchment ( K = 10 −4 m s −1 , compared with −6 to −8 ). The key factors controlling were identified as hydraulic conductivity alluvium, gradient between upstream...

Storey, R. G., A. Wright-Stow, E. Kin, Davies-Colley, and Stott. 2016. Volunteer stream monitoring: Do the data quality monitoring experience support increased community involvement in freshwater decision making? Ecology Society 21(4):32. https://doi.org/10.5751/ES-08934-210432

1. Studies of hyporheic microbial ecology have suggested an important role for processes in stream ecosystem functioning. Using evidence from communities other aquatic habitats, some predictions are made concerning the diversity types and likely to occur zone, relative importance these various ecosystem. 2. It is predicted that biofilm growth form interstitial micro‐organisms will create a variety microniches, allowing coexistence great types, promoting activity otherwise poor competitors....

Dispersal is an essential process which influences the effects of stream restoration on aquatic insect communities, yet dispersal capabilities many New Zealand taxa remain unknown. We estimated realised distances Ephemeroptera, Plecoptera, and Trichoptera by benthic crawling aerial flight in intermittent streams, are recolonised after every dry period. Benthic were not more than 200 m for most genera. In contrast, adult caddisflies found up to 1500 from permanent water, with at least one...

Climate change is altering the water cycle globally, increasing frequency and magnitude of floods droughts. An outstanding question whether biodiversity responses to hydrological disturbance depend on background climatic context – if so, which contexts increase vulnerability disturbance. Answering this requires comparison organismal across environmental gradients. However, opportunities track disturbed communities against an undisturbed baseline remain rare. Here we gathered a global dataset...

Physicochemical conditions in refugia must remain within the tolerance limits of aquatic invertebrates if they are to persist intermittent streams when surface water is absent. We investigated shallow streambed sediments as a refuge for and survival at high temperatures during dry period 3 headwater New Zealand. Sediments from stream beds inundated laboratory contained 37 53 taxa found nearby flowing streams, result suggesting that many attempt use bed periods. Relative abundances...

Summary 1. Spatial relationships between hyporheic invertebrates and subsurface water flow patterns, sediment characteristics, physicochemical parameters several possible food sources were compared over three seasons at one site beneath a riffle. Measures of included particulate organic matter (POM), bacterial activity (aerobic respiration, nitrate respiration mineralisation nitrogen) microbial abundance. 2. Patterns changed significantly the 9‐month study period, from predominantly...

Abstract Macroinvertebrate communities in three stony‐bottomed intermittent headwater streams central Hawke's Bay, New Zealand, were sampled once per month (on average) for 11 months from autumn 2005 to summer 2006, and compared with perennial headwaters. Among the sites, 95 taxa found, Oligochaeta, Copepoda, Chironomidae, Ostracoda occurring greatest abundance. Eight mayfly, 6 stonefly 16 caddisfly species found. abundance at sites was equal nearby but taxon richness sample lower. Community...

Community-based monitoring of freshwaters (a form citizen science) is an area growing interest globally. It could be used to augment professional in New Zealand, as done other countries, if the agreement between volunteer and assessments close enough. We compared benthic macroinvertebrate data with from parallel over 18 months at 8 sites across Zealand. found strong correlations (r=0.77–0.85) little bias using indices a index. Volunteer classifications stream 'quality classes' agreed 70–85%...

In many stream restoration projects, macroinvertebrates characteristic of natural conditions do not return despite habitat improvements. One contributing factor may be lack oviposition sites for some taxa. To understand requirements five taxa, we investigated their egg mass distributions on rocks in streams the Waikato region, New Zealand. We compared insect taxa with aerial adults (caddisfly families Hydrobiosidae and Hydropsychidae, blackfly species Austrosimulium australense sp.) to fully...

Abstract This article overviews community-based water monitoring (CBWM) in Aotearoa-New Zealand (NZ). CBWM was strongly boosted NZ around 2000 by the development of Stream Health Monitoring and Assessment Kit (SHMAK) Wai Care community initiative. Reform freshwater management may be one driver for renewed interest recently CBWM. Because professionals perceive volunteer-monitoring data as unreliable, they currently give little support to volunteer monitoring. To address their concern, we...

The Stream Ecological Valuation (SEV) provides water resource managers with a standardised measure of the ecological functions stream reach. Reaches are assessed in terms their hydrological, biogeochemical, habitat and biological functions. SEV has been widely used for consent applications monitoring Auckland region since 2006. End-user feedback, expert review, an accumulated database data advances underlying science prompted review method 2010. revised is simpler than original, based on...

AbstractThis paper describes research in New Zealand to develop and test a decision support system (DSS) for evaluating the environmental, economic, social, cultural sustainability of urban development relation effects on receiving water bodies. Throughout world, cities have been founded next streams, rivers harbours, but growth has resulted degradation these Contaminants discharged storm runoff impact quality ecosystem health. These environmental changes are consequence ways which bodies...

Whakaweku are bundles of bracken fern (Pteridium esculentum) traditionally placed in lakes and rivers by Māori to harvest kōura (freshwater crayfish, Paranephrops spp.) Aotearoa, New Zealand. Previous studies show they effective for monitoring populations toitoi (small eleotrid fish, Gobiomorphus spp.). We wanted determine whether whakaweku also benthic macroinvertebrate communities streams. a hard-bottomed soft-bottomed reach rural stream the Waikato, took standard 'kick-net' samples from...

Abstract Phewa Lake, Nepal's second largest lake, has been the subject of many short‐term water quality studies in past, although results such have not consistent. Long‐term monitoring data can distinguish typical seasonal dynamics from atypical occurrences. Accordingly, objective present study was to describe patterns and quantify variability, detect long‐term trends provide reliable baseline for future trend detection. The provides 17 years monthly (1993–2010) occasional 2018 0.5 10 m...