Reproductive rate as an index of the environment: 28 years of monitoring Weddell seals in east Antarctica.
Entry ID: wed_index

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Abstract: Publication of these results is currently in progress with the Journal of Animal Ecology.

1.An efficient method of describing change in Antarctic marine ecosystems is long-term monitoring of land-breeding marine predators. High-level predators are used to index the state of environment on the notion that perturbations in the ecosystem will affect their diet, reproductive performance and ... View entire text
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Geographic Coverage
Spatial coordinates   
  N: -67.0   S: -69.0   E: 79.0   W: 76.0

Temporal Coverage
Start Date: 1974-01-01
Stop Date: 2000-12-31
Quality These estimates are derived from models based on the Arnason-Schwarz method, and account for the probability of females surviving between samples; being resighted (and thus included in the sample); and being in breeding or non-breeding state.
In the base model, breeding probability follows a first-order Markov process in that the probability of breeding at time i+1 depends on breeding state at time i. Therefore, reproductive rate can be defined as the probability of being in breeding state at time i+1, conditional on surviving from time i to i+1.
The method accounts for many of the biases inherent in traditional estimates of reproductive rate since re-sight rates can vary between breeding states and survivorship is also incorporated.
Access Constraints These data are not yet publicly available.
Use Constraints This data set conforms to the PICCCBY Attribution License
Data Set Progress
Data Center
Australian Antarctic Data Centre, Australia Supplemental Info
Data Center URL:

Data Center Personnel
Phone: +61 3 6232 3244
Fax: +61 3 6232 3351
Email: metadata at
Contact Address:
Australian Antarctic Division
203 Channel Highway
City: Kingston
Province or State: Tasmania
Postal Code: 7050
Country: Australia
Distribution Media: HTTP
Distribution Size: 6 kb
Distribution Format: excel
Fees: free
Phone: +64 3 473 9002
Email: se_lake at
Contact Address:
7 Pentland Street
City: Dunedin
Country: New Zealand
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2005-08-22
Last DIF Revision Date: 2017-08-24
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