Шеф: Т на пульсацииАмплитуда - годный метод индикации Т. Соавтор ВСД. 2019 год.
textВлияние повышенных температур
Съёмка пульсацийРазработан метод ЦТ-съёмки Шефом и ВСД. Скорость меньше вне протоки.
Wyttenbach: пульсацииРеальный автор метода. Первое исследование в своём роде на Laomedea flexuosa Alder, 1857.
Growth, Coenosarc Pulsations, and Hydroplasm Movement in the Colonial Hydroid Dynamena pumila (L., 1758) Placed in Flow-Through and Nonflow Cuvettes - Biology Bulletin ReviewsAbstract The coenosarc pulsations of the stolon and hydroplasmic flows (HFs) in the colonial hydroid Dynamena pumila (L., 1758) have been recorded in flow-through and nonflow, shallow cuvettes via time-lapse video microscopy. The water in the flow-through cuvette was refreshed during every 24 s. Each episode was video recorded for 2 h. Eleven indicators were used to compare hydroid reactions to maintenance in flowing and nonflowing water: the period and amplitude of pulsations of the stolon growing tip; the hourly stolon growth; the period and amplitude of transverse coenosarc pulsations; the period of unidirectional HF rate pulsations; the maximum velocity of HFs to and from the stolon tip; the distance of particle transfer per act of unidirectional HF; the volume of displaced hydroplasm per HF; and the percentage of the rest ratio in coenosarc pulsations and hydroplasm movement. On the whole, no significant changes in the coenosarc pulsations or in the growth and displacement of the hydroplasm were detected when they were compared sequentially in the same colonies in nonflowing and flowing water. At the same time, there were no changes in the growth, the frequency and amplitude of the transverse pulsations of the coenosarc, or the activity and extent of the hydroplasm currents. However, it was found that the period of growth pulsations increases by 20% in the regime with water exchange in comparison with the previous regime without flowing water. The period of HFs in the stolon increases by 42%, and the maximum current velocity decreases by 20% in flowing water. As a result, the calculated volume of moved hydroplasm in the stolon for one HF decreased by 30% in flow conditions.
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Influence of Temperature on the Growth, Coenosarc Pulsations, and Hydroplasm Movement in the Colonial Hydroid Dynamena pumila (L., 1758) - Biology Bulletin ReviewsAbstract The dependence of the growth and functioning of the transport system of colonial organisms on water temperature has been studied. Time-lapse microvideo recording was used to measure the coenosarc pulsations of the stolon and shoot in the colonial hydroid Dynamena pumila (L., 1758) reared in seawater at 10, 15, 20, 25, and 28°C. As a result, it was possible to determine that microvideo recording of coenosarc pulsations made it possible to track the colony reaction to temperature change for 2 h. The reaction of growth pulsations, lateral pulsations, and hydroplasmtic flows to the changes in the water temperature turned out to be nonlinear. The reaction of the stolon to the changes in the water temperature was more pronounced than those in the shoot. The optimal temperature range was 10–20°C, which displayed the highest growth rate, the most intensive hydroplasm movements, and the largest volume of transferred hydroplasm. At 28°C, the pulsations of the stolon coenosarc became unstable, the growth tended to slow, and the hydroplasm movements were less active. Consequently, according to the results of analysis of coenosarc pulsations, the upper temperature limit of normal life activity for D. pumila colonies inhabiting the White Sea was 25–28°C.
Source: link.springer.com
Views 15 CrossRef citations to date 1 Altmetric ORIGINAL ARTICLES Functional morphology of hydrozoan stolons: stolonal growth, contractility and hydroplasmic movement in Gonothyraea loveni (Allman, 1859)Метод съёмки пульсаций ценосарка