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Some biometrical, ecological, morphological and distributional aspects of Chaetognata

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Abstract

The study of the Chaetognatha picked out from 21 plankton samples taken along the Argentinian, Uruguayan and Brazilian coasts, revealed the presence of the following species: Krohnitta pacifica, K. subtilis, Pterosagitta draco, Sagitta bipunctata, S. enflata, S. friderici, S. hexaptera, S. hispida, S. lyra, S. maxima, S. minima, S. planctonis, S. serratodentata, S. tenuis and S. sp. A. All specimens were measured and a complete biometrical table is included.

Based on the Chaetognatha and the Thecosomata fauna analyzed by means of the Sorensen's index of similarity between samples, the area is divided into four zones with different hydrological characteristics. There is a distinct relationship between the total length of fully mature specimens and latitude.

Based on diagrams, an inter-specific competition between S. enflata and S. t tenuis is suggested. The geographic distribution of K. subtilis and S. planctonis is enlarged.

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  1. Departamento de Biología, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina

    Demetrio Boltovskoy

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  1. Demetrio Boltovskoy
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Boltovskoy, D. Some biometrical, ecological, morphological and distributional aspects of Chaetognata. Hydrobiologia 46, 515–534 (1975). https://doi.org/10.1007/BF00028289

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  • DOI: https://doi.org/10.1007/BF00028289

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