Data

Physical and biological factors influencing larval supply of reef fish to the lagoon of Lord Howe Island

Australian Ocean Data Network
Pickett, Penny
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/8a4669b0-d507-11dc-9d05-00188b4c0af8&rft.title=Physical and biological factors influencing larval supply of reef fish to the lagoon of Lord Howe Island&rft.identifier=https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/8a4669b0-d507-11dc-9d05-00188b4c0af8&rft.description=Abundances of reef fish larvae, conspecific adults and habitat type were measured at 5 sites in the Lord Howe Island lagoon. Light traps were deployed daily over a 28 day period in November and December 2004 to estimated larvae abundances. Transects and visual surveys were used to estimate adult abundances and habitat type. Physical characteristics of the lagoon were measured using current meters, tide and wave gauges and the lunar phase was recorded. Abundances of fish larvae was spatially and temporally variable. Different sites had different habitat type and variable adult abundances. Neither habitat type or adult abundances explained spatial variability in fish larvae. Temporal variability in fish larvae was best explained by the moon phase. There was little difference in physical characteristics between sites.Maintenance and Update Frequency: notPlannedStatement: LARVAL SUPPLY A single light trap was moored at 5 sites across the lagoon and positioned in 3 to 8m of water. The mooring lines moved freely to prevent damage from water currents. Larvae collected in the light traps were collected between 8am and 10am each day. Larvae from the traps were transferred to containers of seawater. Samples were immediately returned to the laboratory, where invertebrates and flotsam were removed. Larvae were identified to the lowest possible taxonomic level. HABITAT TYPE At each of the 5 sites, three 50 x 1m transects were established to measure habitat type. Transects were flagged at 5m intervals and separated by at least 15m. The habitat was characterised at 1 metre intervals along the transect. At each interval the habitat on the transect and 0.5m either side of the transect was recorded as 1 of the 20 habitat categories (see attached word document). The procedure was carried out for each replicate transect, giving a total of 450 data points per site. ADULT ABUNDANCES At each site, conspecific adult abundances were estimated using 15 x 1m transects for highly abundant and cryptic species (e.g. triplefins and gobies) and 25 x 1m transects for the remaining target species (3 species of cardinal fish and 2 species of damselfish).Statement: LIGHT TRAPS Light traps consisted of 3 main parts: the trap body, a removable collecting basket and a removable waterproof light and battery unit. The trap body had a single chamber, constructed from an aluminium frame fitted with clear perspex panels that tapered into a central vertical slit. The collecting basket had 1 mm mesh windows cut into each face for drainage and was attached to the aluminum frame of the main body with quick release clamps. The light source was housed within the clear perspex tube, which was fixed to a watertight PVC cylinder containing a rechargeable sealed lead-acid battery and the electrical circuit. The light was activated by an infrared sensor, allowing the traps to operate continuously during the night.Statement: CURRENT METER Current meters (Inter-Ocean Model S4) were positioned at 4 sites across the lagoon. These sites did not correspond to the sites used for light traps as this part of the project was done in collaboration with scientists involved in oceanographic research. The meters were moored between 1.5 and 3 metres deep on an aluminium frame. The meters were deployed for 17 days between 28/11/04 and 15/12/04 and measured current speed and direction every 5 minutes. WAVE GAUGE A wave gauge (SeaBird SBE 26-03) was used to estimate wave height along the barrier reef enclosing the lagoon. The gauge was moored at a depth of 8m and wave height was recorded hourly for 14 days from 27/11/04 to 10/12/04. TIDE GAUGE A tide gauge moored at a depth of 1.5m and measured tide height every 5 minutes for 18 days from 29/11/04 to 16/12/04.&rft.creator=Pickett, Penny &rft.date=2005&rft.coverage=westlimit=159.07; southlimit=-31.55; eastlimit=159.07; northlimit=-31.55&rft.coverage=westlimit=159.07; southlimit=-31.55; eastlimit=159.07; northlimit=-31.55&rft.coverage=uplimit=8; downlimit=3&rft.coverage=uplimit=8; downlimit=3&rft_rights=Creative Commons Attribution 2.5 Australia License http://creativecommons.org/licenses/by/2.5/au/&rft_rights=The citation in a list of references is: citation author name/s (year metadata published), metadata title. Citation author organisation/s. File identifier and Data accessed at (add http link).&rft_rights=Contact point of contact for access to data.&rft_rights=This metadata may be used in accordance with the Copyright Act 1968.&rft_subject=biota&rft_subject=Biosphere | Ecological Dynamics | Life History&rft_subject=COMMUNITY STRUCTURE&rft_subject=EARTH SCIENCE&rft_subject=BIOSPHERE&rft_subject=ECOLOGICAL DYNAMICS&rft_subject=COMMUNITY DYNAMICS&rft_subject=POPULATION DYNAMICS&rft_subject=SPECIES/POPULATION INTERACTIONS&rft_subject=Biosphere | Zoology | Fish | reef fish&rft_subject=Oceans | Marine Biology | Fish | larvae&rft_subject=Lord Howe Island Marine Park&rft_subject=Marine Reserves&rft_subject=Gobiidae&rft_subject=37 428000&rft_subject=Apogonidae&rft_subject=37 327000&rft_subject=Atherinidae&rft_subject=37 246000&rft_subject=Clupeidae&rft_subject=37 085000&rft_subject=Tripterygiidae&rft_subject=37 415000&rft_subject=Pomacentridae&rft_subject=37 372000&rft_subject=Creedidae&rft_subject=37 395000&rft_subject=Blenniidae&rft_subject=37 408000&rft_subject=Engraulidae&rft_subject=37 086000&rft.type=dataset&rft.language=English Access the data
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The citation in a list of references is: citation author name/s (year metadata published), metadata title. Citation author organisation/s. File identifier and Data accessed at (add http link).

Contact point of contact for access to data.

This metadata may be used in accordance with the Copyright Act 1968.

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Brief description

Abundances of reef fish larvae, conspecific adults and habitat type were measured at 5 sites in the Lord Howe Island lagoon. Light traps were deployed daily over a 28 day period in November and December 2004 to estimated larvae abundances. Transects and visual surveys were used to estimate adult abundances and habitat type. Physical characteristics of the lagoon were measured using current meters, tide and wave gauges and the lunar phase was recorded. Abundances of fish larvae was spatially and temporally variable. Different sites had different habitat type and variable adult abundances. Neither habitat type or adult abundances explained spatial variability in fish larvae. Temporal variability in fish larvae was best explained by the moon phase. There was little difference in physical characteristics between sites.

Lineage

Maintenance and Update Frequency: notPlanned
Statement: LARVAL SUPPLY A single light trap was moored at 5 sites across the lagoon and positioned in 3 to 8m of water. The mooring lines moved freely to prevent damage from water currents. Larvae collected in the light traps were collected between 8am and 10am each day. Larvae from the traps were transferred to containers of seawater. Samples were immediately returned to the laboratory, where invertebrates and flotsam were removed. Larvae were identified to the lowest possible taxonomic level. HABITAT TYPE At each of the 5 sites, three 50 x 1m transects were established to measure habitat type. Transects were flagged at 5m intervals and separated by at least 15m. The habitat was characterised at 1 metre intervals along the transect. At each interval the habitat on the transect and 0.5m either side of the transect was recorded as 1 of the 20 habitat categories (see attached word document). The procedure was carried out for each replicate transect, giving a total of 450 data points per site. ADULT ABUNDANCES At each site, conspecific adult abundances were estimated using 15 x 1m transects for highly abundant and cryptic species (e.g. triplefins and gobies) and 25 x 1m transects for the remaining target species (3 species of cardinal fish and 2 species of damselfish).
Statement: LIGHT TRAPS Light traps consisted of 3 main parts: the trap body, a removable collecting basket and a removable waterproof light and battery unit. The trap body had a single chamber, constructed from an aluminium frame fitted with clear perspex panels that tapered into a central vertical slit. The collecting basket had 1 mm mesh windows cut into each face for drainage and was attached to the aluminum frame of the main body with quick release clamps. The light source was housed within the clear perspex tube, which was fixed to a watertight PVC cylinder containing a rechargeable sealed lead-acid battery and the electrical circuit. The light was activated by an infrared sensor, allowing the traps to operate continuously during the night.
Statement: CURRENT METER Current meters (Inter-Ocean Model S4) were positioned at 4 sites across the lagoon. These sites did not correspond to the sites used for light traps as this part of the project was done in collaboration with scientists involved in oceanographic research. The meters were moored between 1.5 and 3 metres deep on an aluminium frame. The meters were deployed for 17 days between 28/11/04 and 15/12/04 and measured current speed and direction every 5 minutes. WAVE GAUGE A wave gauge (SeaBird SBE 26-03) was used to estimate wave height along the barrier reef enclosing the lagoon. The gauge was moored at a depth of 8m and wave height was recorded hourly for 14 days from 27/11/04 to 10/12/04. TIDE GAUGE A tide gauge moored at a depth of 1.5m and measured tide height every 5 minutes for 18 days from 29/11/04 to 16/12/04.

Notes

Credit
Mick Keough and Steve Swearer were supervisors for this Honours project.
Purpose
(1) To determine the temporal and spatial patterns of laval supply of reef fish to the lagoon at Lord Howe Island and (2) identify physical or biological mechanisms that explain this variation.

Issued: 14 04 2005

Data time period: 2004-11 to 2004-12

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159.07,-31.55

159.07,-31.55

text: westlimit=159.07; southlimit=-31.55; eastlimit=159.07; northlimit=-31.55

text: uplimit=8; downlimit=3

Subjects
37 085000 | 37 086000 | 37 246000 | 37 327000 | 37 372000 | 37 395000 | 37 408000 | 37 415000 | 37 428000 | Apogonidae | Atherinidae | BIOSPHERE | Biosphere | Ecological Dynamics | Life History | Biosphere | Zoology | Fish | reef fish | Blenniidae | COMMUNITY DYNAMICS | Community Structure | Clupeidae | Creedidae | EARTH SCIENCE | ECOLOGICAL DYNAMICS | Engraulidae | Gobiidae | Lord Howe Island Marine Park | Marine Reserves | Oceans | Marine Biology | Fish | larvae | Population Dynamics | Pomacentridae | SPECIES/POPULATION INTERACTIONS | Tripterygiidae | biota |

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Other Information
Habitat categories (Habitat_categories.doc)

uri : https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/8a4669b0-d507-11dc-9d05-00188b4c0af8/attachments/Habitat_categories.doc

Identifiers
  • global : 8a4669b0-d507-11dc-9d05-00188b4c0af8
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