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Shoots as Generators of Hydroplasmic Flows in the Colonial Hydroid Dynamena pumila (L., 1758)

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Abstract

Colonial hydroids are a true model of decentralized systems. Their self-regulation is best manifested in the functioning of the distribution system, and the goal of our research is to elucidate its patterns. The movement of fluid (hydroplasm) inside the gastrovascular cavity in the majority of the studied species of colonial hydroids occurs as a result of transverse pulsations of the hydrants and the common body (coenosarc). The regularity of hydroplasmic flows (HFs) has been studied so far only in the stolons of colonial hydroids. This article shows for the first time the order of the formation of HFs emanating from the shoot, which arise as a result of the pulsation of the coenosarc of the shoot body and the inequality between the number of simultaneously contracting hydrants and the number of simultaneously enlarged hydrants (they cannot actively extent). The mechanism of this discrepancy lies in the ratio of the contraction-relaxation phases of the hydroid body. The role of the hydrant pulsation synchronizer is played by the shoot stem coenosarc, which pulsates more rhythmically than hydrants.

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Notes

  1. Unpublished data.

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Authors and Affiliations

  1. Department of Invertebrate Zoology, Biological Faculty, Moscow State University, 119234, Moscow, Russia

    N. N. Marfenin & V. S. Dementyev

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  1. N. N. Marfenin
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  2. V. S. Dementyev
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Correspondence to N. N. Marfenin.

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Translated by M. Shulskaya

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Marfenin, N.N., Dementyev, V.S. Shoots as Generators of Hydroplasmic Flows in the Colonial Hydroid Dynamena pumila (L., 1758). Biol Bull Rev 11, 498–519 (2021). https://doi.org/10.1134/S2079086421050042

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  • DOI: https://doi.org/10.1134/S2079086421050042

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