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Vertical distribution of early and competent larvae of Concholepas concholepas in two systems of Chilean inland seas

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Abstract

The transport of marine invertebrate larvae is strongly influenced by their distribution in the water column, which could be affected by the biological features of the larvae and environmental variables. Larvae can modify their swimming behavior throughout their planktonic cycle, thereby changing the observed distributional patterns. This ability, coupled with oceanographic features, could induce landward or seaward transport. We studied the vertical distribution of C. concholepas larval stages in two differently stratified systems in Chilean inland seas; Refugio Channel (a strongly stratified channel, where previously has been described as a frontal system) and Guaitecas (a gently stratified system). Combinations of 12–24 h larval collection experiments were done simultaneously with fixed temperature and salinity profiles; meteorological data were also obtained. The results suggest that both salinity and day period influence the C. concholepas distributional patterns in the water column. Early veliger and competent larvae are concentrated in different parts of the water column, probably related to their transport capacities. The upper layer of the water column at the Refugio site, unlike the Guaitecas site, showed a stratified regime, which could affect larval density and larval length between the two sites. Finally, our results suggest that Refugio may be a sink habitat for C. concholepas.

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Acknowledgments

We thank the technicians from Santo Domingo: Mr. Juan L. Barra, Mr. Juan A. Barra, and Mr. Salomon Inarejo for thier enthusiastic field assistance. Comments by three anonymous reviewers helped to improve this paper. The Scientific and Technological Development Fund (FONDEF) of Chile provided financial support for this research. This work was performed while the first author was a student of the Science Doctorate Program and he received support from the National Commission for Scientific and Technological Research (CONICYT) of Chile.

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Authors and Affiliations

  1. Instituto de Acuicultura, Universidad Austral de Chile, Los Pinos s/n, Puerto Montt, Chile

    Carlos Molinet & Alejandra Arévalo

  2. Centro Trapananda, Universidad Austral de Chile, Coyhaique, Chile

    Carlos Molinet & Edwin Niklitschek

  3. Instituto de Ecología y Evolución, Universidad Austral de Chile, Coyhaique, Chile

    Carlos A. Moreno

  4. Centro de Investigación en Ecosistemas Patagónicos, Valdivia, Chile

    Carlos Molinet, Edwin Niklitschek & Carlos A. Moreno

  5. Cien-Austral, Puerto Montt, Chile

    Carlos Molinet

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  1. Carlos Molinet
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  2. Edwin Niklitschek
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  4. Alejandra Arévalo
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Correspondence to Carlos Molinet.

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Communicated by R.J. Thompson.

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Molinet, C., Niklitschek, E., Moreno, C.A. et al. Vertical distribution of early and competent larvae of Concholepas concholepas in two systems of Chilean inland seas. Mar Biol 153, 779–787 (2008). https://doi.org/10.1007/s00227-007-0847-1

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