danДоклады Национальной академии наук БеларусиDoklady of the National Academy of Sciences of Belarus1561-83232524-2431The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"10.29235/1561-8323-2018-62-3-304-310dan-522Research ArticleБИОЛОГИЯBIOLOGYСТЕХИОМЕТРИЧЕСКИЙ СОСТАВ СЕСТОНА В ЛИТОРАЛИ И ПЕЛАГИАЛИ МЕЛКОВОДНОГО ОЗЕРА ОБСТЕРНО (БЕЛАРУСЬ)STOICHIOMETRIC COMPOSITION OF SESTON IN LITTORAL AND PELAGIAL ZONES OF SHALLOW LAKE OBSTERNO (BELARUS)БусеваЖ. В.BusevaZh. F.

Бусева Жанна Федоровна – канд. биол. наук, вед. науч. сотрудник. 

ул. Академическая, 27, 220072, Минск.

Buseva Zhanna Fedorovna – Ph. D. (Biology), Leading researcher.

27, Akademicheskaya Str., 220072, Minsk.

buseva_j@mail.ruФараханиГазераниFarahaniGazerani

Газерани Фарахани Шабнам Бахман – мл. науч. сотрудник.

ул. Академическая, 27, 220072, Минск.

Gazerani Farahani Shabnam Bahman – Junior reresearcher. 

27, Akademicheskaya Str., 220072, Minsk.

sh.farahani1986@gmail.comВересЮ. К.VerasYu. K.

Верес Юлия Константиновна – канд. биол. наук, вед. лаборант. 

220095, к. п. Нарочь, Мядельский р-н, Минская обл.

Veras Yulia Konstantinovna – Ph. D. (Biology), Leading laboratory assistant.

220095, v. Naroch, Miadel district, Minsk region.

veres.julia.naroch@gmail.comКолмаковаА. А.KolmakovaA. A.

Колмакова Анжелика Александровна – канд. биол. наук, науч. сотрудник. 

ул. Академгородок, 50/50, 660036, Красноярск.

Kolmakova Anzhelika Aleksandrovna – Ph. D. (Biology), Researcher.

50/50, Akademgorodok Str., 660036, Krasnoyarsk.

angelika_@inbox.ruСущикН. Н.SushchikN. N.

Сущик Надежда Николаевна – д-р биол. наук., вед. науч. сотрудник, заместитель директора.

ул. Академгородок, 50/50, 660036, Красноярск.

Sushchik Nadezhda Nikolaevna – D. Sc. (Biology), Leading researcher, Deputy Director. 

50/50, Akademgorodok Str., 660036, Krasnoyarsk.

Научно-практический центр Национальной академии наук Беларуси по биоресурсам.Scientific and Practical Center of the National Academy of Sciences of Belarus for Bioresources.Нарочанская биологическая станция им. Г. Г. Винберга.Naroch biological station named after G. G. Vinberg.Институт биофизики Сибирского отделения Российской академии наук.Institute of Biophysics Siberian Branch of Russian Academy of Sciences.201829062018623304310Copyright © Бусева Ж.В., Фарахани Г., Верес Ю.К., Колмакова А.А., Сущик Н.Н., 20182018Бусева Ж.В., Фарахани Г., Верес Ю.К., Колмакова А.А., Сущик Н.Н.Buseva Z.F., Farahani G., Veras Y.K., Kolmakova A.A., Sushchik N.N.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://doklady.belnauka.by/jour/article/view/522

Исследовали элементный состав (C, N, P) и соотношение данных элементов в литорали и пелагиали мелководного мезотрофного озера Обстерно летом и осенью, а также влияние зарослей макрофитов на стехиометрию сестона. В пелагиали и литорали летом соотношение C : N было низким, 4,62 и 7,05 соответственно, однако незначительно увеличивалось осенью – 5,66 в пелагиали против 8,33 в литорали. Высокие значения N : P и низкое содержание фосфора, особенно в литоральной зоне летом (57,7 в июле и 22,47 в сентябре) указывают на высокий уровень ограничения по фосфору в литоральной зоне. Данные о стехиометрии сестона литоральных местообитаний получены впервые и, как показано в данном исследовании, они значительно выше классического соотношения Рэдфилда. Таким образом, основные биогенные элементы – азот и фосфор в биотопах с зарослями макрофитов летом находятся в большем дефиците, чем в пелагиали, что, как мы считаем, может быть вызвано несколькими причинами: конкуренцией между макрофитами и фитопланктоном за биогенные вещества, низким качеством пищи, низкой численностью зоопланктона, а также его бедным таксон-специфичным элементным соотношением в летний сезон.

We estimated the seston elemental composition (C, N, P) and its ratio in pelagic and littoral zones of mesotrophic shallow Lake Obsterno during two contrasting seasons, as well as the influence of macrophyte beds on the seston stoichiometry. In the both pelagial and littoral zones in summer the C: N ratio was small, 4.62 and 7.05 respectively. But it increased slightly during autumn to 5.66 in pelagic samples against 8.33 in littoral ones. The large N : P ratio and the small phosphorus content specially in the macrophyte covered littoral zone equal to 57.7 in July against 22.47 in September suggest a high level of phosphorus limitation in the littoral locations as a possible mediated reason suppressing zooplankton abundance in sumabundance in sum in summer. Our results in the both pelagial and littoral habitat showed a highly P limited situation in which the N : P ratio was larger in littoral with macrophyte than in pelagial zones. The obtained data of littoral seston stoichiometry were recorded for the first time and exceeded the classical Redfield ratio. The elemental imbalance between macrophyte covered littoral and pelagial suggest that nutrients, especially P, are more limiting in macrophyte beds in summer due to the resource competition between phytoplankton and macrophytes for nutrients, a poor food quality, low zooplankton abundance, as well as its poor taxon-specific elemental ratio in summer.

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The authors declare that there are no conflicts of interest present.