Data

Effects of sewage effluent and shorebird exclusion on intertidal infaunal assemblages

Australian Ocean Data Network
Morris, Liz
Viewed: [[ro.stat.viewed]] Cited: [[ro.stat.cited]] Accessed: [[ro.stat.accessed]]
ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/e089e9b0-e037-11dc-8e65-00188b4c0af8&rft.title=Effects of sewage effluent and shorebird exclusion on intertidal infaunal assemblages&rft.identifier=https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/e089e9b0-e037-11dc-8e65-00188b4c0af8&rft.description=This experiment tested the effects of liquid effluents on infauna assemblages in the presence and absence of shorebirds. Small plots of sediment (70cm x 50cm) were dosed with sewage effluent, freshwater, seawater or control ('no dose') and were either open or closed to shorebird predation. The plots were set up in early summer 2000 with replicates of each combination of factors at 4 levels on the shore. Plots were sampled at 0, 4 and 6 weeks for infaunal abundances and biomass and surface sediment chlorophyll a levels.Maintenance and Update Frequency: notPlannedStatement: This experiment was undertaken on the Western Treatment Plant mudflats 2km south west of the Lake Borrie sewage drain. EXPERIMENTAL DESIGN: This was a partly nested factorial experiment with fixed factors dose (4 levels: sewage effluent, freshwater, seawater and control), shorebird exclusion (2 levels: open or exclusion), tidal height (4 levels) and time (3 levels: 0, 4 and 6 weeks). There were 2 plots for each replicate dose that were separated by 5 metres and were either open or closed to shorebird predation. Plots were set up in a blocked design so that there was 1 replicate of each dose treatment with the associated pair of exclusion treatments at each of 4 levels on the shore. SAMPLING: Infaunal samples were taken with a 9cm diameter corer to a depth of 10cm. Sediment samples for chlorophyll a were taken using a cut-off syringe to a depth of 2cm from the same position as the faunal samples. DOSING TECHNIQUE: The dose was applied to plots in liquid form at low tide. The liquid was held in 20 litre barrels that were hung from iron stakes about 1.5m from the ground. Aquarium hose (12.5mm diameter) was attached to each barrel via a tap and buried just below the surface of the sediment and held in place with tent pegs. The hose ran seaward for 5m and was plugged at the end from which 4mm diameter tubes ran perpendicular in both directions into the plots. Small holes were drilled at equal distances into the tubes and buried just below the sediment surface. The dosing system depended on gravity feed and pressure resulting from the change in tubing diameter, which meant that liquid would be delivered to opposing plots (shorebird open and exclusion) simultaneously. Barrels took between 2 and 6 hours to empty. All plots received 26 doses during the course of the experiment. BIRD EXCLUSION: Birds were excluded by 20mm diameter PVC pipes, which had polystyrene floats attached to 2 opposite corners to allow for exclusions to float up and down with the tide. Wooden stakes marking the plots kept the exclusions in place and at low tide they rested on the polystyrene floats making a physical barrier to the shorebirds.&rft.creator=Morris, Liz &rft.date=2008&rft.coverage=westlimit=144.30; southlimit=-38.30; eastlimit=145.20; northlimit=-37.80&rft.coverage=westlimit=144.30; southlimit=-38.30; eastlimit=145.20; northlimit=-37.80&rft_rights=Contact author for access to data&rft_rights=This metadata may be downloaded for the use in accordance with the Copyright Act 1968&rft_subject=biota&rft_subject=Oceans | Marine Biology | Marine Invertebrates | infauna&rft_subject=Biosphere | Zoology | Invertebrates&rft_subject=Human Dimensions | Environmental Impacts | Sewage | effluent&rft_subject=EUTROPHICATION&rft_subject=EARTH SCIENCE&rft_subject=HUMAN DIMENSIONS&rft_subject=HABITAT CONVERSION/FRAGMENTATION&rft_subject=COMMUNITY STRUCTURE&rft_subject=BIOSPHERE&rft_subject=ECOLOGICAL DYNAMICS&rft_subject=COMMUNITY DYNAMICS&rft_subject=Biosphere | Ecological Dynamics | Predation | shorebirds&rft_subject=Biosphere | Ecological Dynamics | Trophic Dynamics | resource enhancement | predation&rft_subject=Biosphere | Aquatic Habitat | Benthic Habitat | soft sediment | mudflat&rft_subject=Western Treatment Plant&rft_subject=Port Phillip Bay&rft_subject=Salinator fragilis&rft_subject=24 486001&rft_subject=Montacuta semiradiata&rft_subject=23 315052&rft_subject=Corophiidae&rft_subject=28 551000&rft_subject=Australonereis ehrlesi&rft_subject=22 056001&rft_subject=Capitellidae&rft_subject=22 002000&rft.type=dataset&rft.language=English Access the data
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Brief description

This experiment tested the effects of liquid effluents on infauna assemblages in the presence and absence of shorebirds. Small plots of sediment (70cm x 50cm) were dosed with sewage effluent, freshwater, seawater or control ('no dose') and were either open or closed to shorebird predation. The plots were set up in early summer 2000 with replicates of each combination of factors at 4 levels on the shore. Plots were sampled at 0, 4 and 6 weeks for infaunal abundances and biomass and surface sediment chlorophyll a levels.

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Maintenance and Update Frequency: notPlanned
Statement: This experiment was undertaken on the Western Treatment Plant mudflats 2km south west of the Lake Borrie sewage drain. EXPERIMENTAL DESIGN: This was a partly nested factorial experiment with fixed factors dose (4 levels: sewage effluent, freshwater, seawater and control), shorebird exclusion (2 levels: open or exclusion), tidal height (4 levels) and time (3 levels: 0, 4 and 6 weeks). There were 2 plots for each replicate dose that were separated by 5 metres and were either open or closed to shorebird predation. Plots were set up in a blocked design so that there was 1 replicate of each dose treatment with the associated pair of exclusion treatments at each of 4 levels on the shore. SAMPLING: Infaunal samples were taken with a 9cm diameter corer to a depth of 10cm. Sediment samples for chlorophyll a were taken using a cut-off syringe to a depth of 2cm from the same position as the faunal samples. DOSING TECHNIQUE: The dose was applied to plots in liquid form at low tide. The liquid was held in 20 litre barrels that were hung from iron stakes about 1.5m from the ground. Aquarium hose (12.5mm diameter) was attached to each barrel via a tap and buried just below the surface of the sediment and held in place with tent pegs. The hose ran seaward for 5m and was plugged at the end from which 4mm diameter tubes ran perpendicular in both directions into the plots. Small holes were drilled at equal distances into the tubes and buried just below the sediment surface. The dosing system depended on gravity feed and pressure resulting from the change in tubing diameter, which meant that liquid would be delivered to opposing plots (shorebird open and exclusion) simultaneously. Barrels took between 2 and 6 hours to empty. All plots received 26 doses during the course of the experiment. BIRD EXCLUSION: Birds were excluded by 20mm diameter PVC pipes, which had polystyrene floats attached to 2 opposite corners to allow for exclusions to float up and down with the tide. Wooden stakes marking the plots kept the exclusions in place and at low tide they rested on the polystyrene floats making a physical barrier to the shorebirds.

Notes

Credit
Keough, M.J., Prof
Purpose
To determine the effects of liquid effluent on infaunal assemblages in the presence and absence of shorebird predation.

Created: 15 02 2008

Data time period: 1997-10-01 to 1997-10-14

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145.2,-37.8 145.2,-38.3 144.3,-38.3 144.3,-37.8 145.2,-37.8

144.75,-38.05

text: westlimit=144.30; southlimit=-38.30; eastlimit=145.20; northlimit=-37.80

Subjects
22 002000 | 22 056001 | 23 315052 | 24 486001 | 28 551000 | Australonereis ehrlesi | BIOSPHERE | Biosphere | Aquatic Habitat | Benthic Habitat | soft sediment | mudflat | Biosphere | Ecological Dynamics | Predation | shorebirds | Biosphere | Ecological Dynamics | Trophic Dynamics | resource enhancement | predation | Biosphere | Zoology | Invertebrates | COMMUNITY DYNAMICS | Community Structure | Capitellidae | Corophiidae | EARTH SCIENCE | ECOLOGICAL DYNAMICS | Eutrophication | HABITAT CONVERSION/FRAGMENTATION | HUMAN DIMENSIONS | Human Dimensions | Environmental Impacts | Sewage | effluent | Montacuta semiradiata | Oceans | Marine Biology | Marine Invertebrates | infauna | Port Phillip Bay | Salinator fragilis | Western Treatment Plant | biota |

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  • global : e089e9b0-e037-11dc-8e65-00188b4c0af8
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