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Memorial University - Electronic Theses and Dissertations 1
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Document Description
Title
A
quantitative
ecological
study
of
aquatic
fungi
from
Broadcove
River
with
emphasis
on
representatives
of the
genus
Saprolegnia
Author
Maestres
,
Luisa
E.
Description
Thesis
(M.Sc.)
--
Memorial
University
of
Newfoundland
,
1977.
Biology
Date
1977
Pagination
ix, 155 leaves : ill.
Subject
Saprolegnia;
Aquatic
fungi--Newfoundland
and
Labrador--Broadcove
River
Degree
M.Sc.
Degree Grantor
Memorial University of Newfoundland. Dept. of Biology
Discipline
Biology
Language
Eng
Spatial Coverage
Canada--Newfoundland and Labrador--Broadcove River
Notes
Bibliography
:
leaves
134-139
Abstract
The
fluctuation
in the
level
of
representatives
of
species
belonging
to the
fungal
Order
Saprolegniales
was
monitored
in
Broadcove
River
over
a
one
year
period.
Some
physical
and
chemical
parameters
of the
stream
were also
monitored.
-
The
technique
used
was
designed
to
provide
a
quantitative
estimate
of the
number
of
fungal
propagules
suspended
in the
water.
Attempts
were
made
to
minimize
the
loss
of the
viable
propagules
during
processing
of the
sample.
The
number
of these
viable
propagules
was
assumed
to
give
an
indication
of the
level
of
fungal
growth
or
reproductive
activity
in the
stream
just
prior
to or at the
time
of
collecting
the
water
sample.
-
Centrifugation
,
resuspension
and
plating
of the
sample
on a
medium
selective
for
species
of the
genus
Saprolegnia
Nees
v.
Esenbeck
were
followed
by the
rapid
isolation
and
subculturing
of the
colonies
as they
appeared.
Further
processing
was
carried
out
to
obtain
sexual
structures
of the
fungi
in
pure
culture
for
purposes
of
identification.
-
Temperature
,
level
of
trace
elements
,
sodium
,
phosphates
,
dissolved
oxygen
and
total
carbon
content
of the
water
(chemical
oxidation
demand)
were
found
to have an
effect
on the
total
number
of
propagules
, and on the
number
of
individual
species
, in
some
cases.
However
, at the
lowest
recorded
temperature
, the
total
number
of
propagules
was
reduced
regardless
of
other
environmental
conditions.
-
The
species
fell
into
three
main
groups
with
relation
to the
temperature
of the
stream
at
which
their
maximum
abundance
occurred.
A
small
number
of
species
, the
winter
species
, was
most
frequent
when
the
stream
temperature
was from
1.50
to
2.50C.
The
most
numerous
category
was
made
up
by the
intermediate
temperature
species
, or those
species
which
were
recorded
most
frequently
at
130C.
Another
small
group
of
species
, the
warm
weather
species
, was
most
abundant
when
the
stream
temperature
was
170C.
-
Occurrence
of
heavy
rains
in
spring
(March)
and
autumn
(September)
resulted
in an
increase
in the
level
of
trace
elements
in the
stream
and
coincided
with the
isolation
of
species
not
otherwise
recorded.
Resting
propagules
of these
species
washed
in from the
surrounding
soil
or
present
in the
water
may
have been
stimulated
to
germinate
and
grow
by the
increased
level
of
micronutrients.
Type
Text
Resource Type
Electronic
resource
or
dissertation
Format
Image/jpg;
Application/pdf
Source
Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries
Local Identifier
76006036
Rights
The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission.
Collection
Electronic
Theses
and
Dissertations
Scanning Status
Completed
PDF File
(96.97
MB)
--
http://collections.mun.ca/PDFs/theses/Maestres_LuisaElena.pdf
CONTENTdm file name
260431.cpd
