In this editorial the author asserts that the decrease in the numbers of amphibians worldwide is because of the global pollution of water and air. To support this assertion he cites two studies of amphibians in Yosemite National Park in California showing that seven species of amphibians in the park with abundant numbers of each species has declined to four species with drastically reduced numbers of each one from 1915 to 1992. He also claims that this decline can not be attributed to the introduction of trout into the park's waters since it has occurred only in Yosemite and is not a worldwide event. A close scrutiny to the evidence reveals that it lends little credence to this argument.
First, the author provides no evidence that the studies’ results are statically reliable. In order to establish a strong conclusion, the studies’ sample must be sufficient in size and representative of the overall population of amphibians worldwide. Lacking evidence of a sufficiently representative sample, the author cannot justifiably rely on the studies to draw any conclusion.
Second, the author unfairly assumes that the decline in the population of the amphibians in the park is due to the water and air contamination. There might be other reasons such as lack of medical care and dearth of healthy foods for the amphibians which lead to outbreak of diseases among the animals or to their malnutrition and consequently their high number of mortality. And without considering and ruling out these and other possible causes the author cannot substantially impute this decline to pollution.
Third, the author unreasonably concludes that trout cannot be the real reason for the Yosemite decline since it does not explain the worldwide decline. Even assuming that this decline has been experienced worldwide, different places around the world can hold distinct reasons for this decline based on the various environmental and climate features in different areas. Therefore, lacking clear opposite evidence, the trout can be the distinct reason in decrease of amphibian in the Yosemite National Park without contracting with the worldwide decline.
In sum, this conclusion is not well supported. To bolster it the author must assures me that the studies’ results reflect the cause of decline in the whole population of amphibians worldwide. To better assess the strength of this argument I need to know about other probable factors which has contributed to this decline in the park.
In this editorial the
author
asserts that the decrease in the
numbers
of
amphibians
worldwide
is
because
of the global pollution of water and air. To support this assertion he cites two
studies
of
amphibians
in Yosemite National
Park
in California showing that seven species of
amphibians
in the
park
with abundant
numbers
of each species has declined to four species with
drastically
reduced
numbers
of each one from 1915 to 1992. He
also
claims that this
decline
can not
be attributed
to the introduction of trout into the park's waters since it has occurred
only
in Yosemite and is not a
worldwide
event
. A
close scrutiny
to the
evidence
reveals that it lends
little
credence to this argument.
First
, the
author
provides no
evidence
that the
studies’
results are
statically
reliable. In order to establish a strong conclusion, the
studies’
sample
must
be
sufficient in size
and representative of the
overall
population of
amphibians
worldwide
. Lacking
evidence
of a
sufficiently
representative sample, the
author
cannot
justifiably
rely on the
studies
to draw any conclusion.
Second, the
author
unfairly
assumes that the
decline
in the population of the
amphibians
in the
park
is due to the water and air contamination. There might be other
reasons
such as lack of medical care and dearth of healthy foods for the
amphibians
which lead to outbreak of diseases among the animals or to their malnutrition and
consequently
their high
number
of mortality. And without considering and ruling out these and other possible causes the
author
cannot
substantially
impute this
decline
to pollution.
Third, the
author
unreasonably
concludes that trout cannot be the real
reason
for the Yosemite
decline
since it does not
explain
the
worldwide
decline
. Even assuming that this
decline
has
been experienced
worldwide
,
different
places around the world can hold distinct
reasons
for this
decline
based on the various environmental and climate features in
different
areas.
Therefore
, lacking
clear
opposite
evidence
, the trout can be the distinct
reason
in decrease of
amphibian
in the Yosemite National
Park
without contracting with the
worldwide
decline.
In sum, this conclusion is not
well supported
. To bolster it the
author
must
assures
me that the
studies’
results reflect the cause of
decline
in the whole population of
amphibians
worldwide
. To better assess the strength of this argument I need to know about other probable factors which has contributed to this
decline
in the
park
.