Issues of the Study of Detritus in Aquatic Systemsстатья
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Дата последнего поиска статьи во внешних источниках: 17 апреля 2018 г.
Авторы:
Sadchikov A.P. ,
Ostroumov S.A.
Журнал:
Russian Journal of General Chemistry
Том:
87
Номер:
13
Год издания:
2017
Издательство:
Maik Nauka/Interperiodica Publishing
Местоположение издательства:
Russian Federation
Первая страница:
3224
Последняя страница:
3229
DOI:
10.1134/S1070363217130199
Аннотация:
ISSN 1070-3632, Russian Journal of General Chemistry, 2017, Vol. 87, No. 13, pp. 3224–3229. © Pleiades Publishing, Ltd., 2017.
Original Russian Text © A.P. Sadchikov, S.A. Ostroumov, 2017, published in Ekologicheskaya Khimiya, 2017, Vol. 26, No. 5, pp. 262–270.
Issues of the Study of Detritus in Aquatic Systems;
A. P. Sadchikov and S. A. Ostroumov*
Faculty of Biology, Moscow State University, Moscow, 119991 Russia;
*e-mail: Ostroumov@mail.bio.msu.ru;
Received March 9, 2017;
ABSTRACT: n this paper, we present the analysis of the ecological roles of detritus and suspended particulate
matter in aquatic ecosystems. New data that have been obtained for freshwater ecosystems of the central part of
Russian Federation (Moscow Region, e.g., Mozhaiskoe Reservoir) have been included in the analysis. These
new data include the results of studies of samples of water and detritus from the aquatic ecosystems. The
review analysis addresses both freshwater and marine ecosystems. The multifunctional important role of
detritus in aquatic ecosystems has been shown and exemplified using data for aquatic bodies of different
trophic level, from oligotrophic to eutrophic.
**
KEYWORDS: detritus, aquatic ecosystems, particulate organic matter, particulate organic carbon, freshwater
ecosystems, marine ecosystems, ocean, oligotrophic, mesotrophic, eutrophic;
**
TEXT:
INTRODUCTION:
The study of ecological role of diverse types of
organic matter found in the biosphere and hydrosphere
is among interesting issues of ecological chemistry.
The studies by V.I. Vernadskii have addressed the
peculiarities of diverse types of the substances in the
biosphere [1–4]. Organic matter produced by living
organisms but no longer being living takes an
important part in the biosphere. Detritus is an example
of such matter [5–9]. The study of detritus has
attracted considerable research interest [10–35] and
has led to the development of a wide range of
chemical, biochemical, biological, microbiological,
and hydrobiological methods. This paper aimed to
briefly review certain prominent issues of the study of
detritus in aquatic ecosystems.
Organic matter in natural surface ecosystems.
The major part of organic matter in water of natural
water objects (water bodies and streams) consists of
high-molecular fractions of dissolved organic matter
(DOM) and detritus. The content of particulate organic
matter in water is measured by determining the content
of carbon (particulate organic carbon, POC). The
average value of POC in some rivers and eutrophic
lakes is about 2 mg/L [33].
Transformation of organic matter occurs in solution
as well as at the phases interface, where the concentration
of organic matter is higher than in bulk water due
to adsorption [13, 36, 37]. The important interfaces in
water are detritus, air bubbles, and the water surface.
Sometimes thermocline (referred to as “the second
bottom”) is included in the water interfaces. Thermal
stratification of water column leads to the
concentration of living and organic matter in this layer,
enhancing the decomposition processes [38, 39].
In many freshwater bodies and streams (outside the
algae bloom period), detritus mass predominates over
this of living plankton matter and is therefore among
the most important components of ecosystems [5–7].
Along with algae and bacteria, detritus is one of the
nutrients sources for zooplankton. It is the trophic
reserve of an ecosystem, accumulating large amount of
energy [40]. Detritus is regarded as the stabilizing
component of ecosystems [6, 41]. On the other hand,
detritus has a high sorption capacity and therefore it
accumulates the organic molecules of the DOM at the
surface of detrital particles. Enzymatic hydrolysis of
the adsorbed organic molecules occurs at the detritus
surface, and then the hydrolysis products are utilized
by plankton organisms [42–45].
Continuation of the text see here: https://www.researchgate.net/publication/322676675;
DOI: 10.1134/S1070363217130199
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