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Efficiency of the Transport System of the Hydroid Dynamena pumila (L., 1758) under Different Abiotic Impacts

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Abstract

In the article, the efficiency (range and volume) of the transport of food particles suspended in hydroplasm along the stolon of the colonial hydroid Dynamena pumila inhabiting the littoral is determined with respect to four environmental factors: the temperature (10, 15, 20, 25, 28°С), salinity (26, 20, 15, 10‰), air exposure (duration 5, 10, 20, 30 min), and the presence or absence of water exchange. The capacity for efficient transport is determined based on the estimated length of local hydroplasma flows that form a chain continuous integral hydroplasmic flows. Local flows covering one or two stolon modules are theoretically sufficient for the generation of joint extended hydroplasmic flows and are thus equally represented for almost all values of the studied environmental factors, except for 28°C and 10‰. This means that the transport system of D. pumila is equally effective in a wide range of temperature and salinity changes, as well as during extended air exposure and the maintenance of colonies in stagnant water. The highest efficiency of colony integration is achieved at 15–20°С, 26–20‰ and after air exposure for 5–10 min. In terms of the degree of integration, there is almost no difference in the number of colonies in nonflowing and flowing conditions. The transfer of colonies from one cuvette with water to another does not affect the intensity of the hydroplasmic flow system.

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Notes

  1. The maximum duration of the HF recorded in this study is 17 mm.

  2. The term “relay” transmission of particles was proposed by Burykin (2013).

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Funding

The study was performed within the framework of the scientific project of the state task of Moscow State University no. 121032300118-0.

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Correspondence to N. N. Marfenin.

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Conflict of interests. The authors declare that they have no conflicts of interest.

Statement on the welfare of animals. This article does not contain any studies involving humans or animals performed by any of the authors.

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Dementyev, V.S., Marfenin, N.N. Efficiency of the Transport System of the Hydroid Dynamena pumila (L., 1758) under Different Abiotic Impacts. Biol Bull Rev 12, 266–278 (2022). https://doi.org/10.1134/S2079086422030021

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  • DOI: https://doi.org/10.1134/S2079086422030021

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