Coupling biogeochemical tracers with fish growth reveals physiological and environmental controls on otolith chemistry
Gretchen L Grammer, John R Morrongiello, Christopher Izzo, Peter J Hawthorne, John F Middleton, Bronwyn M Gillanders
ECOLOGICAL MONOGRAPHS | WILEY | Published : 2017
Biogeochemical tracers found in the hard parts of organisms are frequently used to answer key ecological questions by linking the organism with the environment. However, the biogeochemical relationship between the environment and the biogenic structure becomes less predictable in higher organisms as physiological processes become more complex. Here, we use the simultaneous combination of biogeochemical tracers and fish growth analyzed with a novel modeling framework to describe physiological and environmental controls on otolith chemistry in an upwelling zone. First, we develop increasingly complex univariate mixed models to describe and partition intrinsic (age effects) and extrinsic (envir..View full abstract
Awarded by Australian Research Council
We acknowledge partial funding from the Dr Paris Goodsell Marine Ecology Research Grant, the Nature Foundation SA, the Ecological Society of Australia, CSIRO Wealth from Oceans Flagship, and the Australian Research Council (FT100100767 and DP110100716 awarded to B. M. Gillanders). We acknowledge Aoife McFadden and Benjamin Wade of Adelaide Microscopy for assistance with LA ICP-MS. Special thanks to Joel Redman and Scott Redman of Southend, SA for help with specimen collection. G. L. Grammer was supported by a CSIRO Wealth from Oceans Flagship Postgraduate Scholarship and an Adelaide Scholarship International (University of Adelaide).