Judi E. Hewitt

ORCID: 0000-0002-5083-9715
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About
Contact & Profiles
Research Areas
  • Marine Biology and Ecology Research
  • Marine and coastal plant biology
  • Marine and fisheries research
  • Marine Bivalve and Aquaculture Studies
  • Coastal wetland ecosystem dynamics
  • Coral and Marine Ecosystems Studies
  • Isotope Analysis in Ecology
  • Coastal and Marine Management
  • Aquatic Invertebrate Ecology and Behavior
  • Ecosystem dynamics and resilience
  • Land Use and Ecosystem Services
  • Species Distribution and Climate Change
  • Ecology and Vegetation Dynamics Studies
  • Marine and coastal ecosystems
  • Geology and Paleoclimatology Research
  • Soil and Water Nutrient Dynamics
  • Sustainability and Ecological Systems Analysis
  • Fish Ecology and Management Studies
  • Ocean Acidification Effects and Responses
  • Environmental Toxicology and Ecotoxicology
  • Animal Ecology and Behavior Studies
  • Water Quality and Pollution Assessment
  • Toxic Organic Pollutants Impact
  • International Maritime Law Issues
  • Sustainability and Climate Change Governance

University of Auckland
2009-2025

University of Helsinki
2016-2024

National Institute of Water and Atmospheric Research
2014-2023

Christchurch Hospital
2023

John Wiley & Sons (United States)
2018-2019

Hudson Institute
2019

Ecological Society of America
2018

University of Florida
2013

Auckland Council
2009

Crown Research Institutes
2008

Commercial fishing is one of the most important human impacts on marine benthic environment. One such impact through disturbance to habitats as gear (trawls and dredges) are dragged across seafloor. While direct effects an communities appear obvious, magnitude has been very difficult evaluate. Experimental fishing-disturbance studies have demonstrated changes in small areas; however, broader scale implications attributing these based long-term data considered equivocal. By testing a series...

10.1890/1051-0761(1998)008[0866:dotmbh]2.0.co;2 article EN Ecological Applications 1998-08-01

The wider effects of fishing on marine ecosystems have become the focus growing concern among scientists, fisheries managers and industry. present review examines role habitat structure heterogeneity in ecosystems, (i.e. trawling dredging) these two components complexity. Three examples from New Zealand Australia are considered, where available evidence suggests that has been associated with degradation or loss through removal large epibenthic organisms, concomitant fish species which occupy...

10.1046/j.1365-2400.1999.00167.x article EN Fisheries Management and Ecology 1999-10-01

An important ecological issue is developing an understanding of how patterns and processes vary with scale. We designed a field experiment to test differences in the aerial extent disturbance affected macrofaunal recolonization on sandflat. Three different plot sizes (0.203 $m 2 $, 0.81 3.24 $) were dafaunted, samples collected assess recovery over 9—mo period. As sandflat used for was prone by wind—driven waves, we also measured changes sediment bed height (an indicator stability) course...

10.2307/2265747 article EN Ecology 1996-12-01

10.1016/j.jembe.2008.07.016 article EN Journal of Experimental Marine Biology and Ecology 2008-09-03

When changes in the frequency and extent of disturbance outstrip recovery potential resident communities, selective removal species contributes to habitat loss fragmentation across landscapes. The degree which change is likely influence community resilience will depend on metacommunity structure connectivity. Thus ecological connectivity central understanding for cumulative effects impact upon diversity. importance these issues coastal marine where prevailing concept open communities...

10.1890/07-0436.1 article EN Ecological Applications 2008-01-01

Ocean acidification is a well recognised threat to marine ecosystems. High latitude regions are predicted be particularly affected due cold waters and naturally low carbonate saturation levels. This of concern for organisms utilising calcium (CaCO3) generate shells or skeletons. Studies potential effects future levels pCO2 on high calcifiers at present limited, there little understanding their acclimate these changes. We describe laboratory experiment compare physiological metabolic...

10.1371/journal.pone.0016069 article EN cc-by PLoS ONE 2011-01-05

Processes interacting across scales of space and time influence emergent patterns in ecological systems, but to obtain strong inference empirical generalities, ecologists need balance reality with the practicalities design analyses. This article discusses heterogeneity, scaling, analysis problems offers potential solutions improve empirically based research. In particular, we recommend bridging dichotomy between correlative manipulative studies by nesting within a framework. We suggest that...

10.1086/510925 article EN The American Naturalist 2007-02-05

Global climate change will undoubtedly be a pressure on coastal marine ecosystems, affecting not only species distributions and physiology but also ecosystem functioning. In the zone, environmental variables that may drive ecological responses to include temperature, wave energy, upwelling events freshwater inputs, all act interact at variety of spatial temporal scales. To date, we have poor understanding how climate-related changes affect ecosystems or which are likely produce priority...

10.1111/gcb.13176 article EN Global Change Biology 2015-12-09

Disturbance-mediated species loss has prompted research considering how ecosystem functions are changed when biota is impaired. However, there still limited empirical evidence from natural environments evaluating the direct and indirect (i.e. via biota) effects of disturbance on functioning. Oxygen deficiency a widespread threat to coastal estuarine communities. While negative impacts hypoxia benthic communities well known, few studies have assessed in situ subjected different degrees...

10.1371/journal.pone.0044920 article EN cc-by PLoS ONE 2012-10-16

The concept of ecosystem services has gained traction as a means linking societal benefits to the underlying ecology and functioning ecosystems, is now frequently included in decision-making legislation. Moving service from theory into practice crucial. However, advancements this area research differ by type, marine systems lag significantly behind terrestrial counterparts terms understanding, implementation number studies. In paper we explore several reasons why been limited outline...

10.3389/fmars.2018.00359 article EN cc-by Frontiers in Marine Science 2018-10-10

Global climate change has profound implications on species distributions and ecosystem functioning. In the coastal zone, ecological responses may be driven by various biogeochemical physical environmental factors. Synergistic interactions can occur when combined effects of stressors exceed their individual effects. The Red Sea, characterized strong gradients in temperature, salinity, nutrients along latitudinal axis provides a unique opportunity to study over range these variables. Using...

10.1111/gcb.14819 article EN Global Change Biology 2019-09-04

Seafloor habitats throughout the world's oceans are being homogenized by physical disturbance. Even though seafloor sediments commonly considered to be simple and unstructured ecosystems, negative impacts of habitat homogenization widespread because resident organisms create much their habitat's structure. We combine insight gained from remote sensing with recently developed analytical techniques estimate species richness assess potential for change homogenization. Using habitat-dependent...

10.1890/1051-0761(2006)016[1636:pteohh]2.0.co;2 article EN Ecological Applications 2006-10-01

Suspension‐feeding bivalves play an important role in coastal ecosystems by affecting near‐bed hydrodynamics and, subsequently, rates of biodeposition. We designed a high‐resolution field study to investigate sedimentation and biodeposition around individuals within beds the large pinnid bivalve, Atrina zelandica , link these with sediment biogeochemical characteristics macrofaunal community structure. The was conducted at three sites arrayed along gradient increasing suspended seston...

10.4319/lo.2001.46.8.2067 article EN Limnology and Oceanography 2001-11-01

Estuaries are highly productive ecosystems that can export organic matter to coastal seas (the 'outwelling hypothesis'). However the role of this food resource subsidy on ecosystem functioning has not been examined.We investigated influence estuarine primary production as a and estuaries biodiversity in mollusk-dominated sediment communities. Stable isotope values (δ(13)C, δ(15)N) demonstrated was exported adjacent coast contributed secondary up 4 km from estuary mouth. Further, signatures...

10.1371/journal.pone.0042708 article EN cc-by PLoS ONE 2012-08-03

Interaction between the diversity of local communities and degree connectivity them has potential to influence recovery rates thus profoundly affect community dynamics in face cumulative impacts that occur across regions. Although such complex interactions have been modeled, field experiments natural ecosystems investigate importance regional processes are rare, especially so coastal marine seafloor habitats subjected many types disturbance. We conducted a defaunation experiment at eight...

10.1890/12-0793.1 article EN Ecological Applications 2012-09-04

Declining biodiversity and loss of ecosystem function threatens the ability habitats to contribute services. However, form relationship between (BEF) how relationships change with environmental is poorly understood. This limits our predict consequences on function, particularly in real-world marine ecosystems that are species rich, where multiple functions represented by indicators. We investigated spatial variation BEF across a 300 000 m 2 intertidal sandflat nesting experimental...

10.1098/rspb.2016.2861 article EN Proceedings of the Royal Society B Biological Sciences 2017-04-12

Abstract Sedimentation, nutrients and metal loading to coastal environments are increasing, associated with urbanization global warming, hence there is a growing need predict ecological responses such change. Using regression technique we predicted how maximum abundance of 20 macrobenthic taxa 22 functional traits separately interactively responded these key stressors. The most declined in response sedimentation while unimodal was often nutrient loading. Optimum abundances for both occurred...

10.1038/s41598-017-12323-5 article EN cc-by Scientific Reports 2017-09-14

Marine ecosystems are prone to tipping points, particularly in coastal zones where dramatic changes associated with interactions between cumulative stressors (e.g., shellfish harvesting, eutrophication and sediment inputs) ecosystem functions. A common feature of many degraded estuaries is elevated turbidity that reduces incident light the seafloor, resulting from multiple factors including loading, sea-level rise increased water column algal biomass. To determine whether effects may result...

10.1002/eap.2223 article EN cc-by-nc-nd Ecological Applications 2020-09-01

The sustainability of marine ecosystems demands a focus on ecological improvement, necessitating managers and conservationists to consider range actions from those that limit stressors actively restore. Deciding the most appropriate action should be informed by environmental context, which includes assessing information both degradation recovery potential. Here, we provide an analysis how degree coupled with stressor regime can inform management conservation (e.g., reductions, adaptive...

10.1016/j.biocon.2024.110516 article EN cc-by Biological Conservation 2024-03-08
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