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Two-dimensional X-ray mapping of otoliths, a high-resolution technique for determining amphidromy in the tropical goby Lentipes concolor (Gill)

1999; Elsevier BV; Volume: 238; Issue: 1 Linguagem: Inglês

10.1016/s0022-0981(98)00160-9

1879-1697

Richard L. Radtke, David W. Townsend, R. A. Kinzie, Dariusz P. Fey,

Fish Biology and Ecology Studies

High-resolution X-ray maps of Sr/Ca ratio concentrations in otoliths from a diadromous tropical goby, Lentipes concolor (Gill), were produced that distinguish elemental variations on a scale considerably less than 1 μm2. X-ray maps displayed distinct patterns of strontium incorporation and, combined with the position of daily microincrements, permitted delineation of the timing of experimentally manipulated salinity changes on a daily basis. This technique may have important applications for studying diadromous fishes and in providing evidence for movement between water masses of different salinity over short time periods.