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Browsing School of Science by Author "Vopel, K"

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Now showing items 1-20 of 35

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    • Assessing the Sulfide Footprint of Mussel Farms With Sediment Profile Imagery: A New Zealand Trial 

      Wilson, PS; Vopel, K (PLOS, 2015)
      Growing numbers and increased stocking of marine mussel farms make reliable techniques for environmental effect assessment a priority. Previously, we showed how the color intensity of soft sediment could be used to estimate ...
    • Breathing sediments: microbes, waves, and hidden animal pumps 

      Funnell, G; Vopel, K (NIWA, 2005)
      Kay Vopel and Greig Funnell look into the mechanisms and creatures that help maintain the seabed’s life-support system. Aquatic sediment provides an important ecosystem service: the decomposition of organic matter and the ...
    • Ciliate-generated advective seawater transport supplies chemoautotrophic ectosymbionts 

      Vopel, K; Pohn, M; Sorgo, A; Ott, J (Inter-Research, 2001)
      Variations of [O2] and [H2S] in seawater surrounding laboratory reared sessile ciliates with ectosymbiotic chemoautotrophic bacteria were studied at high spatial and temporal resolutions using amperometric microsensors. ...
    • Colourful seafloor 

      Vopel, K; Giles, H; Zeldis, J (National Institute of Water and Atmospheric Research Ltd (NIWA), 2007)
      Kay Vopel, Hilke Giles,, and John Zeldis have combined three existing tools to come up with a new way of assessing change in coastal ecosystems. Sediments in coastal ecosystems have the job of breaking down organic matter. ...
    • Cues, not an endogenous rhythm, control the water-column entry by benthic copepods 

      Vopel, K; Thistle, D (AUT University, 2011)
      Individuals of some benthic species swim out of or away from the sediment surface into the water column, i.e., they emerge. Individuals of both emergent and nonemergent benthic species can be entrained by near-bottom flows. ...
    • Deposit-feeding sea cucumbers enhance mineralization and nutrient cycling in organically-enriched coastal sediments 

      Mactavish, T; Stenton-Dozey, J; Vopel, K; Savage, C (PLoS, 2012)
      Bioturbators affect multiple biogeochemical interactions and have been suggested as suitable candidates to mitigate organic matter loading in marine sediments. However, predicting the effects of bioturbators at an ecosystem ...
    • Deposition of terrigenous sediment on subtidal marine macirobenthos: response of two contrasting community types 

      Lohrer, AM; Thrush, SF; Lundquist, CJ; Vopel, K; Hewitt, JE; Nicholls, PE (Inter-Research, 2006)
      Changes in patterns of land-use associated with human population growth throughout the world have altered the regime of terrigenous material export from catchments to rivers and, subsequently, to estuarine and marine ...
    • Do pore water solutes affect juvenile bivalve burial behaviour? 

      Hohaia, A; Vopel, K; Pilditch, C (AUT University, 2011)
      Climate change models predict an increase in the frequency of extreme rainfall and thus the supply of terrigenous sediments to coastal waters. Understanding how this supply affects coastal ecosystems has become important ...
    • Effect of the brittle star Amphiura filiformis (Amphiuridae, Echinodermata) on oxygen flux into the sediment 

      Vopel, K; Thistle, D; Rosenberg, R (American Society of Limnology and Oceanography (ASLO) - Blue Policies in RoMEO, 2003)
      O-2 plays a key role in early sedimentary diagenetic processes, but the effect of most macrofaunal species on the pathways and rates of supply of O-2 into the seabed are not well known. We investigated the effect of the ...
    • Effects of CO₂ Enrichment on Benthic Primary Production and Inorganic Nitrogen Fluxes in Two Coastal Sediments 

      Vopel, K; Del-Río, C; Pilditch, CA (Nature, 2018)
      Ocean acidification may alter the cycling of nitrogen in coastal sediment and so the sediment-seawater nitrogen flux, an important driver of pelagic productivity. To investigate how this perturbation affects the fluxes of ...
    • Effects of spatangoid heart urchins on O-2 supply into coastal sediment 

      Vopel, K; Vopel, A; Thistle, D; Hancock, N (Inter-Research, 2007)
      Spatangoid heart urchins are key bioturbators in the marine environment. They pump seawater from the sediment surface around their tests and, at the same time, constantly displace the surrounding sediment. To improve our ...
    • Flow microenvironment of two marine peritrich ciliates with ectobiotic chemoautotrophic bacteria 

      Vopel, K; Reick, CH; Arlt, G; Pohn, M; Ott, JA (Inter-Research, 2002)
      The flow microenvironment of 2 marine peritrich ciliates, Vorticella sp. and Zoothamnium niveum, with ectobiotic sulfur bacteria was studied with frame-by-frame analyses of video sequences and a microsensor for fluid ...
    • Interactions between the mat-forming alga Didymosphenia geminata and its hydrodynamic environment 

      Larned, ST; Packman, AL; Plew, D; Vopel, K (American Society of Limnology and Oceanography, Inc., 2011)
      Algae require dissolved nutrients to grow, but nutrient concentrations are often very low in unpolluted streams and rivers. The supply of dissolved nutrients to benthic (bottom-dwelling) algae increases with increasing ...
    • Microclimate of the brown alga Feldmannia caespitula interstitium under zero-flow conditions 

      Pohn, M; Vopel, K; Grunberger, E; Ott, J (Inter Research, 2001)
      The microclimate of the brown alga Feldmannia caespitula (J. Agardh) Knoepffler-Peguy interstitium was studied using microelectrode techniques. Zero water flow and irradiances of 170 and 1500 mu mol photons m(-2) s(-1) ...
    • Monitoring organic enrichment of coastal sediment 

      Wilson, P; Vopel, K (New Zealand Coastal Society, 2011)
      Organic enrichment of coastal sediment is of interest to coastal managers worldwide. It results from excess supply of organic carbon to coastal waters from both natural and anthropogenic sources such as, terrestrial runoff, ...
    • More than just a crab hole 

      Vopel, K; Hancock, N (NIWA, 2005)
      Mangrove trees trap fine sediment brought in by rivers and the tide. This sediment is the home of various bacteria, algae, protozoa, and invertebrates (such as marine worms) that cope well with the challenges of an intertidal ...
    • New insight on sediment processes 

      Vopel, K (National Institute of Water & Atmospheric Research (NIWA), 2007)
      Bringing the harbour back to life. Postgraduate student Peter Wilson (left) and Dr Kay Vopel measuring microprofiles. (Photo: John Zeldis, NIWA) Coastal sediment acts as a biogeochemical reactor, breaking down organic ...
    • New nematode species and genera (Chromadorida, Microlaimidae) from the deep sea of the eastern tropical South Pacific 

      Bussau, C; Vopel, K (Natural History Museum Vienna, 1999)
      Six new nematode species are described from the sediment of a manganese nodule area of the abyssal eastern South Pacific: Aponema nympha sp.n., Caligocanna mirabilis gen.n. sp.n., Microlaimus discolensis sp.n., M. clancularius ...
    • NIWA news: going under ice to measure microbial mats 

      Vopel, K (NIWA, 2006)
      The Dry Valley region of Southern Victoria Land, the largest icefree region of Antarctica, is one of the coldest and driest deserts in the world. There are numerous meltwater lakes in this region thanks to two regional ...
    • Ocean Science 

      Vopel, K (AUT University, 2010)

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