Data

Sex ratio and distribution within a large population of the fiddler crab Uca capricornis

Australian Ocean Data Network
Detto, Tanya ; Zeil, Jochen, Dr ; Backwell, Patricia, Dr ; Hemmi, Jan, 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/ef6c9dc0-4bbc-11dc-a1f2-00188b4c0af8&rft.title=Sex ratio and distribution within a large population of the fiddler crab Uca capricornis&rft.identifier=https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/ef6c9dc0-4bbc-11dc-a1f2-00188b4c0af8&rft.description=The purpose of this experiment was to determine whether females may be a limited resource within a population of Uca capricornis. The experiment was part of a larger study looking at the relationship between neighbouring males and females in this species. Experiments were conducted in the East Point Reserve, Darwin. Fieldwork was conducted yearly in 18 plots (4mx4m) from November-January in 2002-2006. All individuals within the plots were caught and carapace widths measured. This allowed the sex ratio in relation to size to be determined. The location of burrows were also recorded to determine whether the males and females were distributed independently of each other. The distance to, and sex of, the nearest resident for each individual was also measured to compare mean distances between male-female neighbours and between male-male neighbours. Results indicate that an average of 7 crabs per square metre were active on the surface at any time. The sex ratio was strongly male biased, with only 30% of crabs being female. The sex ratio also changed with size; females were significantly rarer in large size classes.Statement: For 18 plots (4mx4m) all individuals were caught and measured, to calculate the sex ratio in relation to size. The location of burrows were also recorded to determine whether the males and females were distributed independently of each other. The distance to, and sex of, the nearest resident for each individual was also measured to compare mean distances between male-female neighbours and between male-male neighbours. The distance between female-female neighbours was not examined because of the scarcity of females during the study. Population data is presented in a single excel file, with 18 worksheets representing the 18 plots. Parameters: Date, crab code, position of burrow within 4x4 plot (x, y coordinates), sex of crab, carapace width (mm), claw length (mm), left / right handedness, code of closest female and distance from focal individual (cm), code of closest male and distance from focal individual (cm), code of closest individual and distance focal individual (cm). Some worksheets also dispay a plot number.&rft.creator=Detto, Tanya &rft.creator=Zeil, Jochen, Dr &rft.creator=Backwell, Patricia, Dr &rft.creator=Hemmi, Jan, Dr &rft.date=2007&rft.coverage=130.83298,-12.40969 130.83297,-12.40975 130.83302,-12.40975 130.83303,-12.40970 130.83298,-12.40969&rft.coverage=westlimit=130.5; southlimit=-13; eastlimit=131; northlimit=-12&rft.coverage=westlimit=130.5; southlimit=-13; eastlimit=131; northlimit=-12&rft.coverage=uplimit=0; downlimit=0&rft.coverage=uplimit=0; downlimit=0&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=Users are kindly requested to contact the principal investigator for authorisation before utilising or reproducing any material&rft_rights=Thumbnail may not be reproduced without prior consent from the principal investigator&rft_subject=biota&rft_subject=28 960036&rft_subject=CRUSTACEANS&rft_subject=EARTH SCIENCE&rft_subject=BIOLOGICAL CLASSIFICATION&rft_subject=ANIMALS/INVERTEBRATES&rft_subject=ARTHROPODS&rft_subject=Sex ratio&rft_subject=Sex distribution&rft_subject=Behavioural Ecology&rft_subject=Ocypodidae&rft_subject=Fiddler Crab&rft_subject=Uca capricornis&rft_subject=date&rft_subject=crab_code&rft_subject=burrow_position&rft_subject=sex&rft_subject=carapace_width&rft_subject=claw_length&rft_subject=handedness&rft.type=dataset&rft.language=English Access the data
Cite Saved to MyRDA Save to MyRDA

Licence & Rights:

Open Licence view details
CC-BY

Creative Commons Attribution 2.5 Australia License
http://creativecommons.org/licenses/by/2.5/au/

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).

Users are kindly requested to contact the principal investigator for authorisation before utilising or reproducing any material

Thumbnail may not be reproduced without prior consent from the principal investigator

Access:

Other

Brief description

The purpose of this experiment was to determine whether females may be a limited resource within a population of Uca capricornis. The experiment was part of a larger study looking at the relationship between neighbouring males and females in this species. Experiments were conducted in the East Point Reserve, Darwin. Fieldwork was conducted yearly in 18 plots (4mx4m) from November-January in 2002-2006. All individuals within the plots were caught and carapace widths measured. This allowed the sex ratio in relation to size to be determined. The location of burrows were also recorded to determine whether the males and females were distributed independently of each other. The distance to, and sex of, the nearest resident for each individual was also measured to compare mean distances between male-female neighbours and between male-male neighbours. Results indicate that an average of 7 crabs per square metre were active on the surface at any time. The sex ratio was strongly male biased, with only 30% of crabs being female. The sex ratio also changed with size; females were significantly rarer in large size classes.

Lineage

Statement: For 18 plots (4mx4m) all individuals were caught and measured, to calculate the sex ratio in relation to size. The location of burrows were also recorded to determine whether the males and females were distributed independently of each other. The distance to, and sex of, the nearest resident for each individual was also measured to compare mean distances between male-female neighbours and between male-male neighbours. The distance between female-female neighbours was not examined because of the scarcity of females during the study. Population data is presented in a single excel file, with 18 worksheets representing the 18 plots. Parameters: Date, crab code, position of burrow within 4x4 plot (x, y coordinates), sex of crab, carapace width (mm), claw length (mm), left / right handedness, code of closest female and distance from focal individual (cm), code of closest male and distance from focal individual (cm), code of closest individual and distance focal individual (cm). Some worksheets also dispay a plot number.

Notes

Credit
Australian Research Council (ARC) Centre for Excellence for Vision Science
Credit
Australian Research Council (ARC) Discovery Grant
Credit
The Centre of Visual Sciences (CVS, The Australian National University)
Credit
The Australian National University PhD Scholarship
Purpose
To determine whether females may be a limited resource within a population of Uca capricornis.

Issued: 16 08 2007

Data time period: 2002-11 to 2006-01

This dataset is part of a larger collection

Click to explore relationships graph
Help

Related Organisations

Related People

Related Program

130.83298,-12.40969 130.83297,-12.40975 130.83302,-12.40975 130.83303,-12.4097 130.83298,-12.40969

130.833,-12.40972

131,-12 131,-13 130.5,-13 130.5,-12 131,-12

130.75,-12.5

text: westlimit=130.5; southlimit=-13; eastlimit=131; northlimit=-12

text: uplimit=0; downlimit=0

Subjects
28 960036 | ANIMALS/INVERTEBRATES | ARTHROPODS | BIOLOGICAL CLASSIFICATION | Behavioural Ecology | Crustaceans | EARTH SCIENCE | Fiddler Crab | Ocypodidae | Sex distribution | Sex ratio | Uca capricornis | biota | burrow_position | carapace_width | claw_length | crab_code | date | handedness | sex |

User Contributed Tags    

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

Other Information
Raw population data (population_data.xls)

uri : https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/ef6c9dc0-4bbc-11dc-a1f2-00188b4c0af8/attachments/population_data.xls

global : 7ac5fb10-4f77-11dc-87ba-00188b4c0af8

Identifiers
  • global : ef6c9dc0-4bbc-11dc-a1f2-00188b4c0af8
Similar data you may be interested in: