Analysis of growth and stable isotopes in teeth of male Australian fur seals reveals interannual variability in prey resources

Knox, Travis C, Stuart-Williams, Hilary, Warneke, Robert M, Hoskins, Andrew J and Arnould, John PY 2014, Analysis of growth and stable isotopes in teeth of male Australian fur seals reveals interannual variability in prey resources, Marine mammal science, vol. 30, no. 2, pp. 763-781.

Attached Files
Name Description MIMEType Size Downloads

Title Analysis of growth and stable isotopes in teeth of male Australian fur seals reveals interannual variability in prey resources
Author(s) Knox, Travis C
Stuart-Williams, Hilary
Warneke, Robert M
Hoskins, Andrew J
Arnould, John PY
Journal name Marine mammal science
Volume number 30
Issue number 2
Start page 763
End page 781
Total pages 19
Publisher Wiley-Blackwell Publishing
Place of publication London, England
Publication date 2014
ISSN 0824-0469
1748-7692
Keyword(s) Australian fur seal
dentine
environmental variability
pinniped
stable isotope
tooth growth
Summary To detect and monitor long-term ecosystem responses to environmental variability, managers must utilize reliable and quantitative techniques to predict future ecosystem responses. Canine teeth from 67 male Australian fur seals (aged 2-19 yr), collected at Seal Rocks, between 1967 and 1976, were measured for relative growth within the dentine growth layer groups (GLGs), as an index of body growth. Fluctuations in relative growth were apparent during 1956-1971, suggesting interannual variation in prey resources within Bass Strait. These were positively correlated with the Southern Oscillation Index and negatively with the Indian Ocean Subtropical Dipole, both on a 2 yr lag. The observed delay may reflect the time required for the nutrient cascade to filter through to the predominantly benthic prey of Australian fur seals. Stable isotope analysis (?15N/?13C) was also used to investigate whether fluctuations in growth were associated with differences in diet. Relative growth was found to be negatively correlated with ?15N, suggesting years of greater resource availability may be associated with individuals consuming proportionally more prey biomass of lower isotopic value. This study demonstrates that fluctuations in the dentine GLGs of male Australian fur seals are related to environmental parameters, suggesting variation in body growth is mediated by changes in prey resources
Language eng
Field of Research 060201 Behavioural Ecology
060205 Marine and Estuarine Ecology (incl Marine Ichthyology)
060809 Vertebrate Biology
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2013, Wiley
Persistent URL http://hdl.handle.net/10536/DRO/DU:30058849

Document type: Journal Article
Collection: School of Life and Environmental Sciences
Connect to link resolver
 
Unless expressly stated otherwise, the copyright for items in DRO is owned by the author, with all rights reserved.

Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 1 times in TR Web of Science
Google Scholar Search Google Scholar
Access Statistics: 28 Abstract Views, 2 File Downloads  -  Detailed Statistics
Created: Mon, 09 Dec 2013, 13:28:25 EST

Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.