. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. M D. DURHOLTZ ET AL WEST COAST \ \. 37° • 16° 18 20° 22° Figure 1. Distribution of squid sampling sites. 26° otoliths/statoliths, endolymph fluid, maculae) to improve the existing models. Data on statolith deposition are par- ticularly important, as emphasized by Romanek and Gaul- die (1996). An understanding of this process could pro- vide valuable insights into the nature and operation of the circadian rhythm presumed to be implicit in the deposition of daily increments, as well as clarifying the structural and functional
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. M D. DURHOLTZ ET AL WEST COAST \ \. 37° • 16° 18 20° 22° Figure 1. Distribution of squid sampling sites. 26° otoliths/statoliths, endolymph fluid, maculae) to improve the existing models. Data on statolith deposition are par- ticularly important, as emphasized by Romanek and Gaul- die (1996). An understanding of this process could pro- vide valuable insights into the nature and operation of the circadian rhythm presumed to be implicit in the deposition of daily increments, as well as clarifying the structural and functional characteristics of the increments. This lat- ter aspect is felt to be of crucial importance in the applica- tion of the statolith-based aging technique. Our under- standing of these characteristics in fish otoliths has been greatly furthered by investigations of the elemental com- position of otoliths. For example, Gauldie et al. (1992, 1995) used a proton microprobe to evaluate otolith age estimates of two fish species by comparing patterns of checks, cycles in increment width, and cycles in strontium and calcium composition. Mugiya and Satoh (1995) were able to analyze calcium and strontium levels within incre- ments by using X-ray microanalysis. Unfortunately, the goal of the latter study cannot be realized in loliginid squid because the increment widths in the statoliths are typically on the order of 1 Lim or less, below the resolution limits of current microanalytical techniques. However, as has been demonstrated by Gauldie et al. (1992, 1995), microanalysis of elemental composition on a larger scale than that of increments can generate valuable information about the deposition of otoliths and statoliths, and thus may help answer questions about the formation of incre- ments. In the current work we sought (1) to detect any quali- tative associations between statolith microstructure (spe- cifically increment appearance) and the distribution of calcium and strontium w
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
