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progressive vector diagram
producers all organisms which are able to synthesize organic material from less
complex compounds such as carbon dioxide. All green plants belong to this
trophic level and produce organic material by the process of photosynthesis. This
production process is also called primary production. Secondary producers
are not producers in this sense, but convert vegetable organic material
obtained from their food into their own body material. Therefore, they
should properly be called consumers. Tertiary producers are consumers of
animal material. They are at the top of the food chain.
production primary production is the rate at which energy is stored by photosynthetic or chemosynthetic action of producer organisms, in the formation of
organic substances (which can be used as food). Photosynthesis is a fundamental process in primary production; primary producers are chiefly green
plants; in the sea they are microscopic (phytoplankton). In the sea, nutrients,
light and sometimes CO 2 may be limiting factors in primary production.
Primary production is usually expressed as g C per unit of area and time.
Gross primary production is the total rate including organic matter used by the
primary producers in respiration during the measuring period. Net primary
production is the excess of primary production over respiration of the primary producer during the measuring time, i.e., the rate of storage of organic matter in the primary producer; secondary production is the rate of production of herbivorous animals by conversion of their vegetable food into animal tissue, ~producers. It is generally expressed in mass units per unit of area
per unit of time, e.g., g m- 2 y-I. It is usually estimated by summing mean
mass increments of individuals occurring in known numbers per unit area
over a period of time; tertiary production is the rate of production of carnivorous
animals by conversion of their animal food into their own tissues. ~producers.
production efficiency ratio between secondary and primary production or more
general: between production at trophic level n+l and level n (~trophic level
and ~food chain). This ratio is always smaller than 1.0, because not alilevel-n
production is consumed by level n+ 1 and not all consumed material is used
for growth (parts of it are respired and excreted).
production-respiration ratio ratio between organic material synthesized by an
organism and the amount respired. ~producers and ~production efficiency.
productivity relative rate of production.
proglottids segments of the tapeworm (Cestoda); when mature each proglottid
has at least one set of reproductive organs.
progressive vector diagram representation of the variation in current velocity
with time. The velocity at each moment is drawn as a vector on top of the
progressive vector diagram
producers all organisms which are able to synthesize organic material from less
complex compounds such as carbon dioxide. All green plants belong to this
trophic level and produce organic material by the process of photosynthesis. This
production process is also called primary production. Secondary producers
are not producers in this sense, but convert vegetable organic material
obtained from their food into their own body material. Therefore, they
should properly be called consumers. Tertiary producers are consumers of
animal material. They are at the top of the food chain.
production primary production is the rate at which energy is stored by photosynthetic or chemosynthetic action of producer organisms, in the formation of
organic substances (which can be used as food). Photosynthesis is a fundamental process in primary production; primary producers are chiefly green
plants; in the sea they are microscopic (phytoplankton). In the sea, nutrients,
light and sometimes CO 2 may be limiting factors in primary production.
Primary production is usually expressed as g C per unit of area and time.
Gross primary production is the total rate including organic matter used by the
primary producers in respiration during the measuring period. Net primary
production is the excess of primary production over respiration of the primary producer during the measuring time, i.e., the rate of storage of organic matter in the primary producer; secondary production is the rate of production of herbivorous animals by conversion of their vegetable food into animal tissue, ~producers. It is generally expressed in mass units per unit of area
per unit of time, e.g., g m- 2 y-I. It is usually estimated by summing mean
mass increments of individuals occurring in known numbers per unit area
over a period of time; tertiary production is the rate of production of carnivorous
animals by conversion of their animal food into their own tissues. ~producers.
production efficiency ratio between secondary and primary production or more
general: between production at trophic level n+l and level n (~trophic level
and ~food chain). This ratio is always smaller than 1.0, because not alilevel-n
production is consumed by level n+ 1 and not all consumed material is used
for growth (parts of it are respired and excreted).
production-respiration ratio ratio between organic material synthesized by an
organism and the amount respired. ~producers and ~production efficiency.
productivity relative rate of production.
proglottids segments of the tapeworm (Cestoda); when mature each proglottid
has at least one set of reproductive organs.
progressive vector diagram representation of the variation in current velocity
with time. The velocity at each moment is drawn as a vector on top of the