Brief description
We hypothesised that New Zealand sea lions from Campbell Island/Motu Ihupuku of various sex and age classes would utilise the water column differently due to differing physiological constraints and therefore have different accessibility to prey resources. We tested whether sea lion diving behaviour varied in relation to (i) age and sex class, (ii) time of day and (iii) water depth. We also hypothesized that the proportion of benthic/pelagic diving, and consequently risk of fisheries interaction, would vary in relation to age and sex. Satellite telemetry tags were deployed on 25 NZSL from a range of age/sex classes recording dive depth, duration and location. Adult females and juveniles used inshore, benthic habitats, while sub-adult males also utilised benthic habitats, they predominantly used pelagic habitat at greater distances from the island. Adult females and juveniles exhibited shorter dives than the same age/sex classes at the Auckland Islands, suggesting a lower dive effort for these age/sex classes at Campbell Island.Lineage
Maintenance and Update Frequency: notPlannedNotes
CreditWe acknowledge the major supporting institutions; Institute for Marine and Antarctic Studies (University of Tasmania), New Zealand Department of Conservation and the National Institute of Water and Atmospheric Research (grant number TMMA103 to Marine Wildlife Research). We also gratefully acknowledge the following people for their contributions, Simon Wotherspoon, Ben Arthur (analysis assistance), Jim Roberts, Dave Boyle, Penny Pascoe, Marcus Salton, and Henk Haazen (RV Tiama and crew). Animal Ethics permits were obtained from the National Institute of Water and Atmospheric Research to manipulate New Zealand sea lions at Campbell Island, with the proviso that all work would be undertaken with approval from the Department of Conservation and the NZ Department of Conservation permit (SO-32768-MAR) issued under the Marine Mammal Protection Act (1978).
Issued: 25 10 2023
Data time period: 2012-02-02 to 2015-02-25
text: westlimit=168.38; southlimit=-54.60; eastlimit=172.72; northlimit=-51.32
text: uplimit=350; downlimit=20
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(README - data dictionary [csv])
(DATA ACCESS - dive data summary [csv])
uri :
https://data.imas.utas.edu.au/attachments/1d15540b-8b80-45ac-808b-814c19872117/NZSL_dive_summary.csv
(DATA ACCESS - location data summary [csv])
uri :
https://data.imas.utas.edu.au/attachments/1d15540b-8b80-45ac-808b-814c19872117/NZSL_loc_summary.csv
- DOI : 10.25959/70ZV-VS11
- global : 1d15540b-8b80-45ac-808b-814c19872117