Longitudinal Stolon Pulsations in the Colonial Hydroid Dynamena pumila (Linnaeus, 1758)

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

doi:10.1134/s2079086419010043

Cited by 9 publications

(2 citation statements)

References 19 publications

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“…These low-frequency electrical oscillations are often spontaneous (not caused by external stimuli), ubiquitously found in neural systems from Hydra to humans, and are also shown for higher plants, fungi, and bacterial biofilms ( Hanson, 2021 ). Spontaneous mechanical and chemical oscillations are well-known as growth and development regulation factors from hydrozoans to mammals ( Tsiairis and Aulehla, 2016 ; Holmes et al, 2018 ; Marfenin and Dementyev, 2019 ).…”

Section: Discussionmentioning

confidence: 99%

Amino acids integrate behaviors in nerveless placozoans

et al. 2023

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Placozoans are the simplest known free-living animals without recognized neurons and muscles but a complex behavioral repertoire. However, mechanisms and cellular bases of behavioral coordination are unknown. Here, using Trichoplax adhaerens as a model, we described 0.02–0.002 Hz oscillations in locomotory and feeding patterns as evidence of complex multicellular integration; and showed their dependence on the endogenous secretion of signal molecules. Evolutionary conserved low-molecular-weight transmitters (glutamate, aspartate, glycine, GABA, and ATP) acted as coordinators of distinct locomotory and feeding patterns. Specifically, L-glutamate induced and partially mimicked endogenous feeding cycles, whereas glycine and GABA suppressed feeding. ATP-modified feeding is complex, first causing feeding-like cycles and then suppressing feeding. Trichoplax locomotion was modulated by glycine, GABA, and, surprisingly, by animals’ own mucus trails. Mucus triples locomotory speed compared to clean substrates. Glycine and GABA increased the frequency of turns. The effects of the amino acids are likely mediated by numerous receptors (R), including those from ionotropic GluRs, metabotropic GluRs, and GABA-BR families. Eighty-five of these receptors are encoded in the Trichoplax genome, more than in any other animal sequenced. Phylogenetic reconstructions illuminate massive lineage-specific expansions of amino acid receptors in Placozoa, Cnidaria, and Porifera and parallel evolution of nutritional sensing. Furthermore, we view the integration of feeding behaviors in nerveless animals by amino acids as ancestral exaptations that pave the way for co-options of glutamate, glycine, GABA, and ATP as classical neurotransmitters in eumetazoans.

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Section: Discussionmentioning

confidence: 99%

Amino acids integrate behaviors in nerveless placozoans

et al. 2023

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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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Longitudinal Stolon Pulsations in the Colonial Hydroid Dynamena pumila (Linnaeus, 1758)

Cited by 9 publications

References 19 publications

Amino acids integrate behaviors in nerveless placozoans

Amino acids integrate behaviors in nerveless placozoans

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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