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Document Description
Title
The
floral
biology
of
Platanthera
dilatata
(Pursh)
Lindl.
(Orchidaceae)
Author
Boland
,
J.
Todd
(Jeffrey
Todd)
,
1965-
Description
Thesis
(M.Sc.)--Memorial
University
of
Newfoundland
,
1993.
Biology
Date
1993
Pagination
x, 101 leaves : ill.
Subject
Platanthera;
Orchids--Newfoundland
and
Labrador--Flowering;
Pollination
by
insects--Newfoundland
and
Labrador
Degree
M.Sc.
Degree Grantor
Memorial University of Newfoundland. Dept. of Biology
Discipline
Biology
Language
Eng
Spatial Coverage
Canada--Newfoundland and Labrador
Notes
Bibliography:
leaves
92-101.
Abstract
The
floral
ecology
of
Platanthera
dilatata
(Pursh)
Lindl.
in
St.
Phillip's
,
Newfoundland
, was
investigated
during
the
1990-1992
flowering
seasons.
For
comparison
,
two
additional
populations
from
eastern
Newfoundland
and a
population
from
southwestern
Alberta
were also
examined.
Pollinators
were
restricted
to the
nocturnal
Noctuidae
and
diurnal
Hesperiidae.
While
pollinators
were
rarely
observed
,
pollination
exclusion
experiments
indicated
that
insect
vectors
are
required
for
capsule
set.
Percentage
capsule
set
for the
St.
Phillip's
site
was
similar
in
all
three
seasons
(range
=
47.7-56.0%).
Two
populations
from
eastern
Newfoundland
showed
similar
capsule
set
values
while
the
population
in
southwestern
Alberta
had
significantly
higher
capsule
set
(66.8%).
Capsule
set
was
determined
to be
pollinator-limited.
Microhabitats
had
no
effect
on
capsule
set.
P.
dilatata
has a
number
of
physical
characteristics
which
increased
its
opportunity
for
pollination.
These
include
an
extended
blooming
period
,
sequentially-produced
flowers
which
are
long-lived
,
long
receptivity-time
for
flowers
and
continual
odour
production.
The
adaptations
are
particularly
advantageous
during
periods
of
unfavourable
weather
and
low
pollinator
activity.
Additionally
,
it
was
observed
that
some
populations
can
have
seed
production
dramatically
reduced
due
to
insect
damage
and
fungal
infection.
Type
Text
Resource Type
Electronic
thesis
or
dissertation
Format
Image/jpeg;
Application/pdf
Source
Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries
Local Identifier
76185083
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
(10.45
MB)
--
http://collections.mun.ca/PDFs/theses/Boland_JTodd.pdf
CONTENTdm file name
210807.cpd
