Data

Mortality of the gastropod Lepsiella vinosa on the West Head rocky shore in Victoria

Australian Ocean Data Network
Synnot, Russell
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/7912a080-f651-11dc-9fa2-00188b4c0af8&rft.title=Mortality of the gastropod Lepsiella vinosa on the West Head rocky shore in Victoria&rft.identifier=https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/7912a080-f651-11dc-9fa2-00188b4c0af8&rft.description=This study investigated mortality of egg capsules, juveniles, and adult Lepsiella vinosa on the rocky shore at West Head, Victoria. Observations conducted between 1974 and 1979 indicated that polychaetes, nematodes, nemerteans, planarians and mollusks all prey on L.vinosa egg capsules. It was estimated that at least 43% of embryos found over the study period did not hatch. To estimate juvenile mortality, an area of about 0.5 m2 of shingle beach immediately above the rocky shore was excavated to a depth of 15 cm on 21 July 1978. The shingle was sieved through a series of sieves with the smallest size being 1.00 mm. There were 220 empty L.vinosa shells found in the sample and the majority was between 9.5 and 14.0 mm long. A size-frequency distribution of L.vinosa shells was used to estimate the age of death for each individual. The causes of juvenile and adult morality were probably predation by crabs (e.g. Carcinus maenus) and adverse environmental conditions associated with tide emersion periods and desiccation. The results indicated that juvenile mortality is generally low in the first 3 years after hatching and steadily increases throughout the remainder of the life span (up to 10 years). There was no L.vinosa found in the gut contents of the parrotfishes P.fucicola or P.tetricus. Observations of the study area during high tide periods suggested that no other species of fish or bird prey on L.vinosa at West Head.Statement: All shell fragments and entire shells of L.vinosa were removed from the shingle sample. The entire specimens were measured to the nearest 0.1 mm with vernier calipers and assigned to 0.5 mm size classes. The overall lengths of specimens which had been damaged or had incomplete spires were estimated by reference to entire shells of the same aperture length. The proportions of individuals in each age class were adjusted to those of a standard cohort of 1000 individuals and plotted as a function of age to give a survivorship curve.&rft.creator=Synnot, Russell &rft.date=1980&rft.coverage=westlimit=145.03; southlimit=-38.48; eastlimit=145.03; northlimit=-38.48&rft.coverage=westlimit=145.03; southlimit=-38.48; eastlimit=145.03; northlimit=-38.48&rft_rights=Contact the principal investigator for more information about the 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 | gastropoda | thaid&rft_subject=Biosphere | Zoology | Invertebrates&rft_subject=Oceans | Marine Biology | Marine Invertebrates&rft_subject=POPULATION DYNAMICS&rft_subject=EARTH SCIENCE&rft_subject=BIOSPHERE&rft_subject=ECOLOGICAL DYNAMICS&rft_subject=SPECIES/POPULATION INTERACTIONS&rft_subject=Biosphere | Ecological Dynamics | Life History | mortality&rft_subject=Biosphere | Ecological Dynamics | Life History | reproduction&rft_subject=Biosphere | Ecological Dynamics | Predation&rft_subject=Biosphere | Aquatic Habitat | Benthic Habitat | rocky shore&rft_subject=West Head&rft_subject=Western Port Bay&rft_subject=Lepsiella vinosa&rft_subject=24 200165&rft.type=dataset&rft.language=English Access the data
Cite Saved to MyRDA Save to MyRDA

Licence & Rights:

view details

Contact the principal investigator for more information about the data

This metadata may be downloaded for the use in accordance with the Copyright Act 1968

Access:

Other

Brief description

This study investigated mortality of egg capsules, juveniles, and adult Lepsiella vinosa on the rocky shore at West Head, Victoria. Observations conducted between 1974 and 1979 indicated that polychaetes, nematodes, nemerteans, planarians and mollusks all prey on L.vinosa egg capsules. It was estimated that at least 43% of embryos found over the study period did not hatch. To estimate juvenile mortality, an area of about 0.5 m2 of shingle beach immediately above the rocky shore was excavated to a depth of 15 cm on 21 July 1978. The shingle was sieved through a series of sieves with the smallest size being 1.00 mm. There were 220 empty L.vinosa shells found in the sample and the majority was between 9.5 and 14.0 mm long. A size-frequency distribution of L.vinosa shells was used to estimate the age of death for each individual. The causes of juvenile and adult morality were probably predation by crabs (e.g. Carcinus maenus) and adverse environmental conditions associated with tide emersion periods and desiccation. The results indicated that juvenile mortality is generally low in the first 3 years after hatching and steadily increases throughout the remainder of the life span (up to 10 years). There was no L.vinosa found in the gut contents of the parrotfishes P.fucicola or P.tetricus. Observations of the study area during high tide periods suggested that no other species of fish or bird prey on L.vinosa at West Head.

Lineage

Statement: All shell fragments and entire shells of L.vinosa were removed from the shingle sample. The entire specimens were measured to the nearest 0.1 mm with vernier calipers and assigned to 0.5 mm size classes. The overall lengths of specimens which had been damaged or had incomplete spires were estimated by reference to entire shells of the same aperture length. The proportions of individuals in each age class were adjusted to those of a standard cohort of 1000 individuals and plotted as a function of age to give a survivorship curve.

Notes

Credit
Dr. Murray Littlejohn

Issued: 18 02 1980

Data time period: 1975-06 to 1978-12

This dataset is part of a larger collection

Click to explore relationships graph
Help

Related Data

Related Organisations

Related People

145.03,-38.48

145.03,-38.48

text: westlimit=145.03; southlimit=-38.48; eastlimit=145.03; northlimit=-38.48

Subjects
24 200165 | BIOSPHERE | Biosphere | Aquatic Habitat | Benthic Habitat | rocky shore | Biosphere | Ecological Dynamics | Life History | mortality | Biosphere | Ecological Dynamics | Life History | reproduction | Biosphere | Ecological Dynamics | Predation | Biosphere | Zoology | Invertebrates | EARTH SCIENCE | ECOLOGICAL DYNAMICS | Lepsiella vinosa | Oceans | Marine Biology | Marine Invertebrates | Oceans | Marine Biology | Marine Invertebrates | gastropoda | thaid | Population Dynamics | SPECIES/POPULATION INTERACTIONS | West Head | Western Port Bay | biota |

User Contributed Tags    

Login to tag this record with meaningful keywords to make it easier to discover

Other Information

global : 88d44260-f0ae-11dc-9507-00188b4c0af8

Identifiers
  • global : 7912a080-f651-11dc-9fa2-00188b4c0af8
Similar data you may be interested in: