J. Colley results 31
· Newest (Page 1/2, per page 25)
Author: J. Colley ×Clear All Filters
Search Results
Being Circular in a Linear Economy: Local Practitioners as Everyday Intermediaries in the Transition to a Circular Economy in ScotlandNARA Subscribed
Studies about the transition to a circular economy (CE) often focus on high-level questions of resource use and consumption, addressing questions of technical innovation and industrial production. Yet a transition to a circular economy is a societal issue. In this study, we respond to criticisms that the CE often portrays individuals as passive user-consumers, and investigate how smaller-scale actors - people working in the CE...
Studies of river suspended sediment typically focus on mass loads with little attention devoted to sediment properties such as particle size distribution (PSD) or light attenuation. However, environmental behaviour and ecological effects of suspended sediment vary greatly with particle properties. Visual clarity is a particularly important attribute of waters that is strongly affected by particle properties. We studied the rel...
Carrot genotypes differentially alter soil bacterial communities and decomposition of plant residue in soilNARA Subscribed
Purpose Farmers need alternative approaches to manage nitrogen (N) that meet crop needs while reducing loss to the environment. Identifying crop genotypes that promote decomposition of organic materials and understanding the potential mechanisms responsible could help address this challenge. Consequently, we aimed to 1) determine whether carrot genotypes differ in their potential to facilitate organic matter decomposition in s...
A possible role for river restoration enhancing biodiversity through interaction with wildfireNARA Subscribed
Background Historically, wildfire regimes produced important landscape‐scale disturbances in many regions globally. The “pyrodiversity begets biodiversity” hypothesis suggests that wildfires that generate temporally and spatially heterogeneous mosaics of wildfire severity and post‐burn recovery enhance biodiversity at landscape scales. However, river management has often led to channel incision that disconnects rivers from the...
Common, low-frequency, rare, and ultra-rare coding variants contribute to COVID-19 severityNARA Subscribed
The combined impact of common and rare exonic variants in COVID-19 host genetics is currently insufficiently understood. Here, common and rare variants from whole-exome sequencing data of about 4000 SARS-CoV-2-positive individuals were used to define an interpretable machine-learning model for predicting COVID-19 severity. First, variants were converted into separate sets of Boolean features, depending on the absence or the pr...
Seagrass meadows are vulnerable to fine sediment (mud) pollution, with impacts usually attributed to reduction in submerged light. Here we tested two non-exclusive hypotheses, that mud particles (
Community volunteer assessment of recreational water quality in the Hutt River, WellingtonNARA Subscribed
Water is an important component of many recreational opportunities and New Zealand invests significant resources in recreational water quality (RWQ) monitoring to assess risks to public health. However, monitoring primarily focuses on microbiological hazards and RWQ is considerably broader than this. The goal of this study was to take a comprehensive approach to evaluating RWQ while exploring the potential for greater public i...
Blue Lake, a remote sub‐alpine lake, in Nelson Lakes National Park, New Zealand, has exceptional optical purity. Horizontal sighting range (‘visibility’) on six visits approached 80 m, the theoretical limit based on accepted light‐attenuation coefficients for pure water, making Blue Lake the most visually clear freshwater yet reported. Blue Lake is characterized by blue‐violet hues seen only in the clearest natural waters. Lig...
This paper provides an overview of the Motueka integrated catchment management (ICM) research programme. This research was based on the thesis that achieving ecosystem resilience at a catchment scale requires active measures to develop community resilience. We define a generic adaptive planning and action process, with associated knowledge management and stakeholder involvement processes, and illustrate those processes with ob...
Modelling the time course of shade, temperature, and wood recovery in streams with riparian forest restorationNARA Subscribed
Action is increasingly being taken in New Zealand and elsewhere to restore ecological function to streams through planting of riparian zones. We used simulation modelling to explore the relative performance of three strategies to restore the riparian zone of a pastoral stream to native forest by: (1) passive regeneration; (2) planting then abandonment of a Pinus radiata plantation; and (3) active restoration by planting select...
The mechanisms of interaction between stream life and habitat are often complex and poorly understood. We explored the response of a freshwater crayfish ( Paranephrops planifrons ) to the functions of large wood with a view towards possible future use of wood in stream restoration in New Zealand. We compared three sub‐reach types within a native forest stream in the central North Island, New Zealand; complex wood‐rich, simple...
We measured inherent and apparent optical properties and computed ‘optical closure’ in four lakes on the South Island of New Zealand, ranging very widely in reflectance. Optical properties were measured by modern instruments deployed from boats, with supporting laboratory measurements on water samples. The radiative transfer model, Hydrolight, was used with measured inherent optical properties to predict characteristics of the...
Water quality impact of a dairy cow herd crossing a streamNARA Subscribed
The water quality impact of a herd of 246 dairy cows crossing a stream ford was documented. Two cow crossings produced plumes of turbid water associated with very high concentrations of faecal indicator bacteria ( Escherichia coli ) and high suspended solids (SS) and total nitrogen (TN). On the first crossing, towards the milking shed, the cows were tightly‐bunched and produced a sharp spike of contamination ( E. coli peaking...