Influence of Food Consumption on the Functioning of the Pulsator-Reversible Transport System in Hydroids—An Idiographic Approach

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

doi:10.1134/s207908642205005x

Cited by 2 publications

(4 citation statements)

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“…Individual shoots were placed on glass slides or on photographic plates without an emulsion (9 cm × 12 cm in size) [34,35]. The slides with D. pumila shoots attached to them were placed in a ten-litre aquarium placed in a large, opaque container filled with water.…”

Section: The Cultivation Of Coloniesmentioning

confidence: 99%

“…The pulsations of the coenosarc can be express indicators of the state of a colonial organism of hydroids. The most sensitive and reliable among all indicators of coenosarc pulsation are the regular successive protrusions and contractions of the terminal end of the apex of a stolon or shoot, which are usually called growth pulsations or pulsations of the growth apex [34,35]. Normally, growth pulsations are rhythmic and can be characterised by several indicators, including their period, amplitude, and growth per pulsation cycle.…”

Section: Time-lapse Microvideo Recording Techniquementioning

confidence: 99%

“…Our experience, gained from many years of research, suggests that the samples in the study of the growth, resorption, and functioning of the distribution system should be small in order to be able to individually analyse the processes studied in each colony, along with statistical processing [25,27,35]. Modular and especially branched organisms differ from each other incomparably more than unitary (single) organisms [27].…”

Section: The Number Of Colonies In the Experimentsmentioning

confidence: 99%

“…Therefore, during a study, one should strive not to increase the sample and limit the parameters but to ensure a comprehensive individual consideration of a variety of indicators, using the example of the optimal number of individuals. This approach is called "idiographic" [35].…”

Section: The Number Of Colonies In the Experimentsmentioning

confidence: 99%

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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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Section: The Cultivation Of Coloniesmentioning

confidence: 99%

Section: Time-lapse Microvideo Recording Techniquementioning

confidence: 99%