Growth, Coenosarc Pulsations, and Hydroplasm Movement in the Colonial Hydroid Dynamena pumila (L., 1758) Placed in Flow-Through and Nonflow Cuvettes

Marfenin, N. N.; Dementyev, V. S.

doi:10.1134/s2079086419010055

Cited by 9 publications

(2 citation statements)

References 29 publications

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“…Hence, it is involved in the activity of zooids. However, the coenosarc displays limited activity: periodical peristaltic waves pass along the stolon and shoot coenosarc (Marfenin and Dementyev, 2019 ) and the growing tips of the stolons and shoots demonstrate growth pulsations (Kosevich, 2006 ). As the colonial body constitutes a branching tube, the coenosarc cannot contract (shorten its length), so the longitudinally oriented epidermal muscle processes appear functionless.…”

Section: Discussionmentioning

confidence: 99%

Ultrastructural and immunocytochemical evidence of a colonial nervous system in hydroids

Kosevich

2023

Front. Neural Circuits

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BackgroundAs the sister group to all Bilateria, representatives of the phylum Cnidaria (sea anemones, corals, jellyfishes, and hydroids) possess a recognizable and well-developed nervous system and have attracted considerable attention over the years from neurobiologists and evo-devo researchers. Despite a long history of nervous system investigation in Cnidaria, most studies have been performed on unitary organisms. However, the majority of cnidarians are colonial (modular) organisms with unique and specific features of development and function. Nevertheless, data on the nervous system in colonial cnidarians are scarce. Within hydrozoans (Hydrozoa and Cnidaria), a structurally "simple" nervous system has been described for Hydra and zooids of several colonial species. A more complex organization of the nervous system, closely related to the animals' motile mode of life, has been shown for the medusa stage and a few siphonophores. Direct evidence of a colonial nervous system interconnecting zooids of a hydrozoan colony has been obtained only for two species, while it has been stated that in other studied species, the coenosarc lacks nerves.MethodsIn the present study, the presence of a nervous system in the coenosarc of three species of colonial hydroids - the athecate Clava multicornis, and thecate Dynamena pumila and Obelia longissima - was studied based on immunocytochemical and ultrastructural investigations.ResultsConfocal scanning laser microscopy revealed a loose system composed of delicate, mostly bipolar, neurons visualized using a combination of anti-tyrosinated and anti-acetylated a-tubulin antibodies, as well as anti-RF-amide antibodies. Only ganglion nerve cells were observed. The neurites were found in the growing stolon tips close to the tip apex. Ultrastructural data confirmed the presence of neurons in the coenosarc epidermis of all the studied species. In the coenosarc, the neurons and their processes were found to settle on the mesoglea, and the muscle processes were found to overlay the nerve cells. Some of the neurites were found to run within the mesoglea.DiscussionBased on the findings, the possible role of the colonial nervous system in sessile hydroids is discussed.

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Section: Discussionmentioning

confidence: 99%

Ultrastructural and immunocytochemical evidence of a colonial nervous system in hydroids

Kosevich

2023

Front. Neural Circuits

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“…When studying the thermotolerance of the colonial hydroid Dynamena pumila (L., 1758), the temperature limits of survival were the focus of attention [25,49,50]. The lower temperature limit can be determined biogeographically from the temperature in winter in the habitats of the D. pumila population.…”

Section: Discussionmentioning

confidence: 99%

How Tolerant Are Hydroids to Climate-Change-Induced Acute Spikes in Sea Water Temperature? A Case Study of Arctic Dynamena pumila (L., 1758)

Marfenin,

Dementyev,

Nikolaev

2023

Hydrobiology

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The temperature of the water surface layer in the Arctic may increase significantly in the coming decades. To what extent will shallow-water fauna be affected by warming? We investigated this issue using an example of one species of colonial hydroid, Dynamena pumila. We judged its reaction to warming via its pulsation activity and the growth of stolons. Pulsations of the coenosarc in colonial hydroids are a sensitive indicator of the body’s reaction to the influence of environmental factors. We tested the ability of D. pumila colonies to survive and adapt to existing at 25 °C for five days. After raising the temperature from 14 °C to 25 °C, colony growth and the pulsation of stolon growth tips on the first day increased and then decreased during the day. In the following days, the growth pulsations almost ceased, the colonies stopped growing, and their coenosarcs began to exfoliate from their perisarcs. However, by the fourth day, this process slowed down, and the colonies existed in an economy mode of experiencing unfavourable conditions. The thermal shock continued in the experiment for five days. Then, after the temperature dropped from 25 °C to 15–16 °C, all the colonies recovered within five days and continued to grow.

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Influence of Temperature on the Growth, Coenosarc Pulsations, and Hydroplasm Movement in the Colonial Hydroid Dynamena pumila (L., 1758)

Dementyev

Marfenin

2019

Biol Bull Rev

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Growth, Coenosarc Pulsations, and Hydroplasm Movement in the Colonial Hydroid Dynamena pumila (L., 1758) Placed in Flow-Through and Nonflow Cuvettes

Cited by 9 publications

References 29 publications

Ultrastructural and immunocytochemical evidence of a colonial nervous system in hydroids

Ultrastructural and immunocytochemical evidence of a colonial nervous system in hydroids

How Tolerant Are Hydroids to Climate-Change-Induced Acute Spikes in Sea Water Temperature? A Case Study of Arctic Dynamena pumila (L., 1758)

Influence of Temperature on the Growth, Coenosarc Pulsations, and Hydroplasm Movement in the Colonial Hydroid Dynamena pumila (L., 1758)

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