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Using stable isotope analysis with telemetry or mark-recapture data to identify fish movement and foraging
R A Cunjak1, J-M Roussel, M A Gray
1Canadian Rivers Institute and Department of Biology, University of New Brunswick, P.O. Box 4400, Fredericton, NB, Canada, E3B 5A3. cunjak@unb.ca
Oecologia
|June 17, 2005
Summary
Combining stable isotope analysis (SIA) with telemetry and mark-recapture techniques provides precise insights into fish movement and feeding ecology. This integrated approach overcomes SIA
Area of Science:
- Ecology
- Ichthyology
- Animal Movement Ecology
Background:
- Stable isotope analysis (SIA) is commonly used to infer animal movements but relies on dietary assimilation of site-specific isotopic signatures.
- This reliance can limit ecological interpretations, necessitating complementary methods for precise individual movement tracking.
- Technological advancements now allow for non-destructive tissue sampling and the tagging/remote detection of smaller aquatic animals.
Purpose of the Study:
- To demonstrate the value of combining SIA with telemetry and mark-recapture data for studying fish movement and feeding ecology.
- To investigate the movement and foraging strategies of fish in different habitats, including fjord lake systems and rivers.
- To differentiate between foraging movements and movements to thermal refugia in response to environmental conditions.
Main Methods:
- Stable isotope analysis (SIA) of fish tissues.
- Telemetry using passive integrated transponder (PIT) tags for individual tracking.
- Mark-recapture data from trapping and electrofishing.
Main Results:
- Juvenile Atlantic salmon exhibited varied migration and foraging behaviors in a Newfoundland fjord lake system, reflecting different life history strategies.
- SIA in the Miramichi River indicated distinct foraging habitats (tributary vs. large river), further clarified by PIT tag data showing movements for foraging and thermal refuge.
- Slimy sculpin displayed high site fidelity and limited mobility (<10 m displacement), supported by SIA and PIT tag data.
Conclusions:
- Combining SIA with telemetry and mark-recapture techniques offers a robust approach to understanding fish movement and feeding ecology.
- This integrated methodology overcomes limitations of SIA alone and provides detailed insights into habitat use and behavioral responses.
- Advancements in non-destructive sampling and tagging technologies enhance the study of animal ecology, particularly for smaller species.