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Eco-morphological patterns of the sagitta of Antarctic fish

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Abstract

Morphology and morphometry of the sagittae otolith were studied in pelagic and mesopelagic fish. The shape, margins and rostrum of four groups of otoliths from several species were analyzed: group 1 (pelagic fish associated with the under ice cover N = 42), group 2 (pelagic fish associated with water offshore N = 9), group 3 (mesopelagic fish associated with extensive vertical migration N = 57) and group 4 (mesopelagic fish associated with short vertical migration N = 54). E (maximum width of the sagitta /maximum length of the sagitta %), R (rostrum length (RL)/maximum length of the sagitta %) and S (sulcus area (SS)/otolith area (OS) %) indexes were calculated for each species. Sagittae of pelagic groups (1 and 2) showed the smallest sagitta dimensions in relation to the total length of the fish, in this group the sagitta shape is variable. Sagittae of mesopelagic fish (groups 3 and 4) showed variable shape and edges. The shape in group 4 was polygonal and these species have more width than length. Statistical analysis showed significant differences in the E, R and S indexes. These results were compared with other 19 species, belonging to six families, taken from a publisher-edited literature. E, R and S-values could be used to characterize the sagittae of the Antarctic fish and could be considered as a useful tool for fish ecology studies.

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Acknowledgments

We are grateful to G. Daneri (MACN) for collected samples.

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Authors and Affiliations

  1. Biodiversity and Experimental Biology Department, FCEyN, University of Buenos Aires, Buenos Aires, Argentina

    Alejandra V. Volpedo, A. D. Tombari & Dinorah D. Echeverría

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  1. Alejandra V. Volpedo
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  2. A. D. Tombari
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  3. Dinorah D. Echeverría
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Correspondence to Alejandra V. Volpedo.

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Volpedo, A.V., Tombari, A.D. & Echeverría, D.D. Eco-morphological patterns of the sagitta of Antarctic fish. Polar Biol 31, 635–640 (2008). https://doi.org/10.1007/s00300-007-0400-1

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