Meta-analysis of 87Sr/86Sr ratios in otoliths to establish thresholds for determining fish movement
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Published:2023-12-28
Issue:
Volume:49
Page:
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ISSN:1678-2305
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Container-title:Boletim do Instituto de Pesca
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language:
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Short-container-title:Bol. Inst. Pesca
Author:
Rosa Fábio Ricardo daORCID,
Avigliano EstebanORCID,
Duponchelle FabriceORCID,
Pereira Luciana AlvesORCID,
Hauser MaríliaORCID,
Barroco Lorenzo Soriano AntonaccioORCID,
Freitas Carlos Edwar de CarvalhoORCID,
Sousa Raniere Garcez CostaORCID
Abstract
Unpublished data were combined with a literature review to test a hypothesis of whether there is a pattern for classifying fish as “movers” or “residents” according to variability in strontium isotope ( 87 Sr/ 86 Sr) ratios in otoliths as a function of its environmental fingerprint. The variability in Sr ratios found in the otoliths of fish specimens as a percentage of isotopic environmental variability was used to determine the intensity of movement in a given study area (POEVSri index). A classic meta-analysis and a frequentist regression were applied to obtain a logistic model to describe the pattern. The meta-analysis returned a POEVSri limit of 28.95% for sedentary individuals and the logistic model shows a high probability of movement for POEVSri indices over 32%. There is a gradient of movement probabilities in the POEVSri interval from 8 to 32%, with each class having equal odds when POEVSri is approximately 20%. Regarding applicability for future studies, if aspects such as sufficient spatial and seasonal water sampling are addressed, the model provides two different thresholds for fish: a priori “movers” are those with POEVSri ≥ 32%, and resident fish have POEVSri ≤ 8%.
Publisher
Boletim do Instituto de Pesca
Subject
Animal Science and Zoology,Aquatic Science