15 concentration. This was the first suggestion of algal
defenses against grazing.获得更多gre考试咨询点击进入免费咨询顾问或联系QQ客服:800004500
Perhaps the fact that many of these first studies
considered only algae of a size that could be collected
in a net , a practice that over-
20 looked the smaller phytoplankton
that we now know grazers are most likely to feed on,
led to a de-emphasis of the role of grazers in subse-
quent research. Increasingly, as in the individual
studies of Lund, Round, and Reynolds, researchers
25 began to stress the importance of environmental
factors such as temperature, light, and water move-
ments in controlling algal numbers. These environ-
mental factors were amenable to field monitoring and
to simulation in the laboratory. Grazing was believed
30 to have some effect on algal numbers, especially after
phytoplankton growth rates declined at the end of
bloom periods, but grazing was considered a minor
component of models that predicted algal population
dynamics.
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