Data

Cockburn Cement - Success Bank - Seagrass and Sand Invertebrates - 1990's

Australian Ocean Data Network
Brearley, Anne, Dr
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/b2b90ea0-1ef7-11dc-bf0a-00188b4c0af8&rft.title=Cockburn Cement - Success Bank - Seagrass and Sand Invertebrates - 1990's&rft.identifier=https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/b2b90ea0-1ef7-11dc-bf0a-00188b4c0af8&rft.description=Invertebrates (epifauna & infauna) from seagrass (Amphibolis griffithii, Posidonia coriacea, Heterozostera tasmanica) and adjacent sand habitats on Success Bank (5-7 m) and deep water (12 m) in Owen Anchorage and Gage Roads were collected at three locations, three time periods in 1997/1998. Three replicates were made at each location, giving a total of 45 samples per sampling period (5 habitats x 3 locations x 3 replicates per location). Three major samplings (summer 1997, winter 1997 and summer 1998) were undertaken to obtain information on seasonal and annual variations. An additional study incorporated samples collected from 11-17 m deep areas dredged in 1985, 1994 and 1996 that were compared to the bare sediments in natural basin habitats to the north and south of the sites on the sand bank. Density, biomass and production of invertebrates were lowest in the most recently dredged areas. There were some differences between dredging time and locations within dredging time.Maintenance and Update Frequency: asNeededStatement: Cores, steel with a serrated edge (0.25 m2 core – quadrats), were carefully lowered over the seagrass and pushed into the sediment. Epifauna associated with leaves, epiphytes and stems were collected by cutting the shoot at the base, and placed in a material in a calico bag. Infauna were collected with an airlift to which a bag of 0.5 mm mesh attached. Samples were preserved in 8% buffered formalin. Samples were passed through a graduated series of 0.5, 0.71, 1.0, 1.4, 2, 2.8, 4, 5.6 and 8 mm sieves. The fauna retained on each sieve was counted. Biomass and production of crustaceans, molluscs and worms were estimated from the abundance of particular faunal groups in different sieve-sizes, using relationships developed by Edgar (1990a). Biomass of other organisms and those larger than 8 mm measured were weighed and production estimated from a generic equation for invertebrates. All equations were adjusted for water temperature at the time of sampling. Epifaunal and infauna communities were analysed separately. Reports for Cockburn Cement detail these findings (Brearley and Wells 2000). Other reports examined the diversity of flora and fauna diversity in areas dominated by each of the three seagrass species (Lavery et. al. 2000a), calcium carbonate and nitrogen (Lavery et. al. 2000b) and trophic dynamics (Smit et al 2000). Two papers on trophic dynamics were also published (Smit et. al. 2005 and 2006). A synthesis report was also submitted (Walker et. al. 2000).&rft.creator=Brearley, Anne, Dr &rft.date=1996&rft.coverage=westlimit=115.6; southlimit=-32.3; eastlimit=115.78; northlimit=-32&rft.coverage=westlimit=115.6; southlimit=-32.3; eastlimit=115.78; northlimit=-32&rft.coverage=uplimit=14; downlimit=7&rft.coverage=uplimit=14; downlimit=7&rft_subject=oceans&rft_subject=biota&rft_subject=Oceans | Marine Biology | Marine Invertebrates&rft_subject=Oceans | Marine Biology | Marine Plants&rft_subject=Amphibolis griffithii&rft_subject=Cymodoceaceae&rft_subject=63 618005&rft_subject=Posidonia coriacea&rft_subject=Posidoniaceae&rft_subject=63 617008&rft_subject=Heterozostera tasmanica&rft_subject=Zosteraceae&rft_subject=63 619004&rft_subject=sea grass&rft_subject=eel grass&rft.type=dataset&rft.language=English Access the data
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Brief description

Invertebrates (epifauna & infauna) from seagrass (Amphibolis griffithii, Posidonia coriacea, Heterozostera tasmanica) and adjacent sand habitats on Success Bank (5-7 m) and deep water (12 m) in Owen Anchorage and Gage Roads were collected at three locations, three time periods in 1997/1998. Three replicates were made at each location, giving a total of 45 samples per sampling period (5 habitats x 3 locations x 3 replicates per location). Three major samplings (summer 1997, winter 1997 and summer 1998) were undertaken to obtain information on seasonal and annual variations. An additional study incorporated samples collected from 11-17 m deep areas dredged in 1985, 1994 and 1996 that were compared to the bare sediments in natural basin habitats to the north and south of the sites on the sand bank. Density, biomass and production of invertebrates were lowest in the most recently dredged areas. There were some differences between dredging time and locations within dredging time.

Lineage

Maintenance and Update Frequency: asNeeded
Statement: Cores, steel with a serrated edge (0.25 m2 core – quadrats), were carefully lowered over the seagrass and pushed into the sediment. Epifauna associated with leaves, epiphytes and stems were collected by cutting the shoot at the base, and placed in a material in a calico bag. Infauna were collected with an airlift to which a bag of 0.5 mm mesh attached. Samples were preserved in 8% buffered formalin. Samples were passed through a graduated series of 0.5, 0.71, 1.0, 1.4, 2, 2.8, 4, 5.6 and 8 mm sieves. The fauna retained on each sieve was counted. Biomass and production of crustaceans, molluscs and worms were estimated from the abundance of particular faunal groups in different sieve-sizes, using relationships developed by Edgar (1990a). Biomass of other organisms and those larger than 8 mm measured were weighed and production estimated from a generic equation for invertebrates. All equations were adjusted for water temperature at the time of sampling. Epifaunal and infauna communities were analysed separately. Reports for Cockburn Cement detail these findings (Brearley and Wells 2000). Other reports examined the diversity of flora and fauna diversity in areas dominated by each of the three seagrass species (Lavery et. al. 2000a), calcium carbonate and nitrogen (Lavery et. al. 2000b) and trophic dynamics (Smit et al 2000). Two papers on trophic dynamics were also published (Smit et. al. 2005 and 2006). A synthesis report was also submitted (Walker et. al. 2000).

Notes

Credit
Cockburn Cement Ltd
Credit
The University of Western Australia (UWA)
Purpose
To determine the ecological significance of seagrass and effect of dredging.

Created: 21 06 1996

Data time period: 1996-06-01 to 1998-03-31

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115.78,-32 115.78,-32.3 115.6,-32.3 115.6,-32 115.78,-32

115.69,-32.15

text: westlimit=115.6; southlimit=-32.3; eastlimit=115.78; northlimit=-32

text: uplimit=14; downlimit=7

Subjects
63 617008 | 63 618005 | 63 619004 | Amphibolis griffithii | Cymodoceaceae | Heterozostera tasmanica | Oceans | Marine Biology | Marine Invertebrates | Oceans | Marine Biology | Marine Plants | Posidonia coriacea | Posidoniaceae | Zosteraceae | biota | eel grass | oceans | sea grass |

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  • global : b2b90ea0-1ef7-11dc-bf0a-00188b4c0af8
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