Английский для специалистов по защите окружающей среды и безопасности жизнедеятельности. Ульянова О.В. - 31 стр.

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(a group of organisms living in the given area). Within the ecosystem, species
are connected by food chains or food webs.
The concept of an ecosystem can be applied to units of variable size,
such as a pond, a field, or a piece of deadwood. A unit of smaller size is
called microecosystem. For example, an ecosystem can be a stone and all the
life on it. A mesoecosystem could be a forest, and a macroecosystem a whole
ecoregion with its drainage basin. As most of these borders are not rigid,
ecosystems tend to blend into each other. As a result, the whole earth can be
seen as a single ecosystem, while a lake can be divided into several ecosys-
tems, depending on the scale used.
Ecosystems are often classified by reference to the biotopes concerned.
The following ecosystems may be defined:
• continental ecosystems, such as forest ecosystems, meadow ecosystems
such as steppes or savannas), or agro-ecosystems;
• ecosystems of inland waters, such as lentic ecosystems such as lakes or
ponds;
• lotic ecosystems such as rivers;
• oceanic ecosystems.
Another classification can be done by reference to its communities, such
as in the case of a human ecosystem.
The main questions when studying an ecosystem are:
• whether the colonization of a barren area could be carried out;
• investigation of the ecosystem's dynamics and changes;
• the methods of which an ecosystem interacts at local, regional and global
scale;
• investigating the value of an ecosystem and the ways and means the in-
teraction of ecological systems provide benefit to humans.
19. Match the parts of definitions.
1. Ecosystem is
2. Biotic components are
3. Abiotic components are
4. Lentic ecosystems are
5. Lotic ecosystems are
6. Drainage basin is
7. Barren area is
a) based on running water reservoirs.
b) physical and chemical components of
an ecosystem.
c) the area from which water flows down
into a water reservoir organisms.
d) based on dead-water reservoirs
e) interaction of living organisms and
their environment in some defined area.
f) are without any plants growing on it.
g) living in an ecosystem.

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