Data

Stylet elemental signatures indicate population structure in a holobenthic octopus species, Octopus pallidus

Name: Stylet elemental signatures indicate population structure in a holobenthic octopus species, Octopus pallidus
Published: 2011

University of Tasmania, Australia

Doubleday, Zoe ; Pecl, Gretta, Dr ; Semmens, Jayson, 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://metadata.imas.utas.edu.au/geonetwork/srv/eng/catalog.search#/metadata/bf45925b-a422-4849-b17d-071564b386b0&rft.title=Stylet elemental signatures indicate population structure in a holobenthic octopus species, Octopus pallidus&rft.identifier=https://metadata.imas.utas.edu.au/geonetwork/srv/eng/catalog.search#/metadata/bf45925b-a422-4849-b17d-071564b386b0&rft.description=Targeted trace elemental analysis was used to investigate the population structure and dispersal patterns of the holobenthic octopus species Octopus pallidus. Multi-elemental signatures within the pre-hatch region of the stylet (an internal ‘shell’) were used to determine the common origins and levels of connectivity of individuals collected from 5 locations in Tasmania. To determine whether hatchling elemental signatures could be used as tags for natal origin, hatchling stylets from 3 of the 5 locations were also analysed.Maintenance and Update Frequency: notPlannedStatement: Octopus hatchlings were collected from 3 sites: Circular Head (CH) on the north coast of Tasmania, and Mercury Passage (MP) and Northwest Bay (NWB) on the southeast coast of Tasmania, Australia. Unbaited octopus pots attached to demersal longlines and set at depths between 12 to 30 m were used to provide nesting habitat for mature females. Pots were deployed for 3 to 5 mo and were checked regularly for egg broods. If eggs were present, a PVC mesh bag was tied securely around the pot to aid hatchling collection and prevent predation on the eggs. The pot was subsequently checked every 2 to 4 wk. This procedure did not affect the mother, as she did not feed or leave her ‘den’ during egg development. The well developed benthic hatchlings were collected as ‘near hatching’ eggs or recently hatched individuals. To assess the temporal short-term variation in hatchling elemental signatures, 2 additional batches of hatchlings were collected from NWB, with collections spaced 4 to 6 wk apart. All specimens were frozen (the –18°C) upon collection. Using pots and longlines, adult octopuses were collected 6 to 10 mo after the hatchlings from the same sites described above. According to an age study of Octopus pallidus from the collection site, mature adults had an average age of 8 mo. Therefore, it is likely that these adults hatched around the time the hatchlings were collected. To minimise potentially confounding temporal variation in elemental signatures, it is recommended that adults are assigned to natal site based on juvenile elemental signatures that are from a similar age cohort to the adults. Adults without an ‘equivalent’ hatchling sample were additionally collected from west Flinders Island (WFI) and east Flinders Island (EFI). For each adult specimen, whole weight (g), sex and maturity stage were recorded. Males were classified as mature or immature, depending on the presence or absence of visible spermatophores in Needham’s sac. Females were assigned a maturity stage from 1 to 5. Stages 1 to 4 (immature to mature) were assigned according to ovary size and level of egg development, and Stage 5 was assigned to postspawning females. Octopuses ranged in weight from 280 to 1012 g, all males were mature and most females were either Stage 3 or 4. For further information on stylet preparation and analysis, please consult the published paper.&rft.creator=Doubleday, Zoe &rft.creator=Pecl, Gretta, Dr &rft.creator=Semmens, Jayson, Dr &rft.date=2011&rft.coverage=westlimit=144.50; southlimit=-44.00; eastlimit=148.50; northlimit=-39.00&rft.coverage=westlimit=144.50; southlimit=-44.00; eastlimit=148.50; northlimit=-39.00&rft.coverage=uplimit=30; downlimit=12&rft.coverage=uplimit=30; downlimit=12&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=Please contact Z. Doubleday for access to the data.&rft_rights=The data described in this record are the intellectual property of Zoe Doubleday.&rft_subject=oceans&rft_subject=MOLLUSKS&rft_subject=EARTH SCIENCE&rft_subject=BIOLOGICAL CLASSIFICATION&rft_subject=ANIMALS/INVERTEBRATES&rft_subject=Population structure&rft_subject=Stylet&rft_subject=Elemental signatures&rft_subject=Laser ablation&rft_subject=Octopus pallidus&rft_subject=Fisheries Management&rft_subject=AGRICULTURAL AND VETERINARY SCIENCES&rft_subject=FISHERIES SCIENCES&rft_subject=Marine and Estuarine Ecology (incl. Marine Ichthyology)&rft_subject=BIOLOGICAL SCIENCES&rft_subject=ECOLOGY&rft_subject=Whole body weight&rft_subject=Sex&rft_subject=Stage of maturity&rft_subject=Element concentration&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).

Please contact Z. Doubleday for access to the data.

The data described in this record are the intellectual property of Zoe Doubleday.

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Targeted trace elemental analysis was used to investigate the population structure and dispersal patterns of the holobenthic octopus species Octopus pallidus. Multi-elemental signatures within the pre-hatch region of the stylet (an internal ‘shell’) were used to determine the common origins and levels of connectivity of individuals collected from 5 locations in Tasmania. To determine whether hatchling elemental signatures could be used as tags for natal origin, hatchling stylets from 3 of the 5 locations were also analysed.

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Maintenance and Update Frequency: notPlanned

Statement: Octopus hatchlings were collected from 3 sites: Circular Head (CH) on the north coast of Tasmania, and Mercury Passage (MP) and Northwest Bay (NWB) on the southeast coast of Tasmania, Australia. Unbaited octopus pots attached to demersal longlines and set at depths between 12 to 30 m were used to provide nesting habitat for mature females. Pots were deployed for 3 to 5 mo and were checked regularly for egg broods. If eggs were present, a PVC mesh bag was tied securely around the pot to aid hatchling collection and prevent predation on the eggs. The pot was subsequently checked every 2 to 4 wk. This procedure did not affect the mother, as she did not feed or leave her ‘den’ during egg development. The well developed benthic hatchlings were collected as ‘near hatching’ eggs or recently hatched individuals. To assess the temporal short-term variation in hatchling elemental signatures, 2 additional batches of hatchlings were collected from NWB, with collections spaced 4 to 6 wk apart. All specimens were frozen (the –18°C) upon collection. Using pots and longlines, adult octopuses were collected 6 to 10 mo after the hatchlings from the same sites described above. According to an age study of Octopus pallidus from the collection site, mature adults had an average age of 8 mo. Therefore, it is likely that these adults hatched around the time the hatchlings were collected. To minimise potentially confounding temporal variation in elemental signatures, it is recommended that adults are assigned to natal site based on juvenile elemental signatures that are from a similar age cohort to the adults. Adults without an ‘equivalent’ hatchling sample were additionally collected from west Flinders Island (WFI) and east Flinders Island (EFI). For each adult specimen, whole weight (g), sex and maturity stage were recorded. Males were classified as mature or immature, depending on the presence or absence of visible spermatophores in Needham’s sac. Females were assigned a maturity stage from 1 to 5. Stages 1 to 4 (immature to mature) were assigned according to ovary size and level of egg development, and Stage 5 was assigned to postspawning females. Octopuses ranged in weight from 280 to 1012 g, all males were mature and most females were either Stage 3 or 4. For further information on stylet preparation and analysis, please consult the published paper.

Notes

Credit
Department of Primary Industries and Water (Tasmania)

Credit
Winifred Violet Scott Estate Grant

Credit
Holsworth Wildlife Research Endowment

Created: 26 10 2011

Data time period: 05 2006 to 30 09 2007

This dataset is part of a larger collection

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text: westlimit=144.50; southlimit=-44.00; eastlimit=148.50; northlimit=-39.00

text: uplimit=30; downlimit=12

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global : bf45925b-a422-4849-b17d-071564b386b0