
U101-C Flowmeter
Materials:
Body: Cast lron (Spray-Painted)
seals: Buna-N
Technical Specifications:
Discharge rate of each revolution:0.5L
Flow rate range:5L~60L/min
Accuracy:±0.2%
Repeat error:�.1%
Environmental condition:-40~~+70degree
Package:
Product ID Net Weight Cross Weight Dimension
U101-C 23kg/case of 1 25kg/case of 1 28Ă—26Ă— 45cm/case of 1
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fishing the wrong way—that fish stocks would fare better if efforts were made to protect entire
ecosystems rather than individual species.
There are plenty of data to prove the importance of diversity on dry land. Until recently, however, there
was little evidence that the same was the case in the oceans, which make up 90% of the biosphere, and
on which a billion people rely for their livelihoods.
In order to establish whether diversity matters in t fuel dispe fuel dispenser nser he sea as well as on land, 11 marine biologists, along
with three economists, have spent the past three years crunching all the numbers they could lay their
hands on. These ranged from the current United Nations Food and Agriculture Organisation s database to
information hundreds of years old, gleaned from kitchen records and archaeology. The results of their
comprehensive analysis have been published in Science.
Marine biodiversity, they report, matters because it is variety per se that delivers services—such as
maintaining water quality and processing nutrients—to humans as well as the goods people reap from the
sea. It also ensures these goods and services recover relatively rapidly after an accident or natural
disturbance. The new work is silent on exactly how biodiversity protects these things—merely showing
that it does. Earlier work though has shown some possible mechanisms. One example from a study in
Jamaica showed that continuously removing algae-grazers from a reef allowed the algae to overwhelm
the coral.
The latest study, led by Boris Worm of Dalhousie University, in Halifax, Canada, gathered the available
material into four separate groups. The researchers found the same result from different pools of data, in
different types of marine ecosystems and at different scales.
Trawling the data
In the first the marine ecologists re-examined 32 small-scale experiments in which researchers had
altered the variety of sea life and recorded what happened. Overall, each of the six ecosystem processes
examined—which i fuel dispenser