327,091 research outputs found
Changes in the Emergent Plant Community of Netley-Libau Marsh Between 1979 and 2001
No full textWe used aerial photography combined with field observations to develop a detailed aquatic vegetation map for Netley-Libau Marsh in south-central Manitoba. This report describes the creation of a new geographically accurate map (georeferenced for use in a Geographic Information System - GIS), based on aerial photos taken in 2001, and construction of a detailed vegetation map for evaluating the changing state of Netley-Libau Marsh. This provides a basis for comparison with a 1979 vegetation map enabling a quantitative assessment of changes in the marsh over a 22-year period.
Comparisons between 1979 and 2001 reveal several significant changes in Netley-Libau Marsh. Loss of emergent vegetation and the erosion of separating uplands between adjoining water bodies has been extensive, resulting in the amalgamation and expansion of many marsh bays and ponds. Currently, half of the entire marsh (13,125 ha, 51%) is open water, compared to 35% (8,884 ha) in 1979. Cattail (Typha spp.) continues to be the dominant emergent plant in the marsh, showing little change between surveys. However, hard- and soft-stem bulrush (Schoenoplectus spp.) have declined ten-fold in abundance, from 3,247 ha (13%) to 317 ha (1%). The mixed river bulrush and sedge community, along with the wet meadow communities, have also declined in abundance. Plant communities at drier sites, however, have remained relatively unchanged.
Reasons for the observed changes in the marsh are not well known or understood, but change is not a recent development. Maps of the marsh from the 1920s to the present show a pattern of increasing open water area and loss of upland and island habitats. These changes are likely related to a number of factors, but the influence of Lake Winnipeg and the Red River are likely the most important.
Lake Winnipeg dictates water levels within Netley-Libau Marsh. Since the droughts of the 1930s and 1940s, water levels on Lake Winnipeg and the marsh have included few intervening dry periods. Without extended dry periods, to periodically allow the germination of new emergent vegetation, there has been a slow but consistent loss of emergent vegetation in the marsh. As this vegetation is lost, the protection that it provides for the soft sediments that make up island and upland habitats is also lost, and these habitats are slowly being washed away. The current management of Lake Winnipeg for hydroelectric production works to prevent low water levels on the lake and the marsh.
The Red River passes through Netley-Libau Marsh and it has likely contributed to some of the observed changes. High flow events on the river result in the erosion and collapse of weak points in the levees that border the river and other channels. Netley Cut, which was originally dredged in 1913, has been gradually eroded to a point where it now carries a substantial portion of the Red River flow into Netley Lake. The end of dredging on the Red River in 1999 has also likely contributed to the alteration of Red River flows through the marsh. High nutrient loads in the Red River, along with the arrival of common carp, may be contributing to enhanced algal growth and loss of submersed vegetation within the marsh. Loss of submersed vegetation results in the destabilization of bottom sediments and increased wind-induced wave action, which further helps erode island and upland habitats.
Without an ability to manage marsh water levels independently of Lake Winnipeg, only a prolonged drought will help restore the emergent plant communities of Netley-Libau Marsh. Dry conditions experienced in 2003 helped re-establish some of the emergent plant communities of the marsh, but the recent return to wet conditions may make this reversal short-lived.
We conclude that Netley-Libau Marsh resembles a shallow turbid lake more than a healthy coastal wetland. Any benefits to Lake Winnipeg which the marsh could provide as wildlife and fisheries habitat, and in removing and storing nutrients that would otherwise enrich the lake, have probably been degraded or lost
Interview with Richard E. Marsh
No full textAn interview on November 7, 1997, with crystallographer Richard E. Marsh, senior research associate, emeritus, in the Division of Chemistry and Chemical Engineering. Dr. Marsh received his BS in chemistry from Caltech in 1943 and his PhD from UCLA in 1950. He came to Caltech that year as a research fellow, to work under Linus Pauling. He continued in crystallographic research at Caltech for the remainder of his career.
In this interview he discusses his father’s stint as a speechwriter for Franklin D. Roosevelt; the family’s move to Redlands, California; his undergraduate years at Caltech; and his subsequent naval service (1943-1946). He recalls his year of postwar graduate work at Tulane, where he studied crystallography with Rose C. L. Mooney, and his transfer to UCLA for his PhD with James McCullough. Recollections of postdoc with Linus Pauling, working with David Shoemaker, Edward W. Hughes, Jerry Donohue, Verner Schomaker, Robert B. Corey. Pauling and Corey’s paper on possible DNA structure; “overblown” competition with James Watson and Francis Crick. His work with Corey on small-molecule biological crystallography. Lavish government funding of sciences after the war. Pauling’s profligate hiring. Remarks on his work, which continued in his emeritus status. Remarks on undergraduate life at Caltech in the early forties: Officer “Fig” Newton; intramural tackle football
Roy Marsh
No full textRoy Marsh, prior to reporting back after R & R leave, dressed in tropical serviceman's uniform, holding a small girl.Unknown.Date:1944-0
Master's Recital: John Marsh, organ
No full textThis recital is given in partial fulfillment of the requirements for the Master of Music degreeMr. Marsh is a student of Clyde Holloway.Prelude and Fugue in E Major, Vincent Lübeck (1656-1740) -- Veni Creator, Nicolas de Grigny (1672-1703) -- Sonata in E Flat Major, S. 525, Johann Sebastian Bach (1685-1750) -- Choral in B Minor (1890), César Franck (1822-1890) -- Deuxième Fantaisie (1936), Jehan Alain (1911-1940) -- Prélude et Danse Fugée (1964), Gaston Litaize (1909-
Marsh Memorial Library
No full textA photograph of Springfield College's library, Marsh Memorial, featuring several cars parked in the driveway in front of the building. Also in the image are two students walking by the building.On May 25, 1912 excavation for Springfield College’s new library, Marsh Memorial, began. The cornerstone was laid by President Laurence Locke Doggett on Commencement day of 1912 (June 12th) and construction began on September 1, 1912. The new building was dedicated on October 18, 1913 with William Howard Taft, the 27th President of the United States, serving as the featured speaker. The library was named Marsh Memorial after the late Edward Williams Marsh of Bridgeport, Connecticut who gave 80,000 required for the erection of the library. He died just before its completion. The new library was of Gothic design, with red brick with brownstone and terra cotta trimmings laid in red cement. It was approximately 72 feet front by 117 feet deep, and consisted of two stories as well as a basement.
Marsh Memorial served as the College’s library until the opening of Babson Library in 1971. After Babson Library was opened, Marsh Memorial was renovated for other uses. A chapel was developed in the large room in Marsh which already contained stained glass windows. Marsh is still used for religious purposes today, offering regular worship services for members of the college. Other offices the building houses are the President’s office, the Office of Academic Affairs, and the Department of Public Safety
Marsh Memorial Library, 1947
No full textA photograph, taken from the front, of Springfield College's Marsh Memorial building, 1947.On May 25, 1912 excavation for Springfield College’s new library, Marsh Memorial, began. The cornerstone was laid by President Laurence Locke Doggett on Commencement day of 1912 (June 12th) and construction began on September 1, 1912. The new building was dedicated on October 18, 1913 with William Howard Taft, the 27th President of the United States, serving as the featured speaker. The library was named Marsh Memorial after the late Edward Williams Marsh of Bridgeport, Connecticut who gave 80,000 required for the erection of the library. He died just before its completion. The new library was of Gothic design, with red brick with brownstone and terra cotta trimmings laid in red cement. It was approximately 72 feet front by 117 feet deep, and consisted of two stories as well as a basement.
Marsh Memorial served as the College’s library until the opening of Babson Library in 1971. After Babson Library was opened, Marsh Memorial was renovated for other uses. A chapel was developed in the large room in Marsh which already contained stained glass windows. Marsh is still used for religious purposes today, offering regular worship services for members of the college. Other offices the building houses are the President’s office, the Office of Academic Affairs, and the Department of Public Safety.A handwritten note on the back of this image indicates the photograph is from Nov. 1947
How Proud
No full textPoem: Ella Frears Animation: Annlin Chao and Birdhide Films Based on research by Michael Howcroft, Nicky Marsh and Joseph Owen
Delta Marsh Field Station Archive Annual Report, Volume 4, 1969
No full textThe University Field Station had another successful
season and fifteen research projects were undertaken during the summer.
They included:--popu1ation and productivity studies in algae and
emergent marsh species; nitrification processes in marsh soils; the
relationship between evapotranspiration in Phragmites and water table
fluctuations; ecological studies on benthic fauna; factors determining
mollusc distribution; population dynamics of Brook Sticklebacks;
comparative ecology of two species of Shiner; internal helminths of
two amphibian species; reproductive biology of Forster's Tern; territory
in the Yellow Warbler, seasonal energy balance in the muskrat; geomorphic,
sedimentological and stratigraphic investigations of the area between
Portage la Prairie and Lake Manitoba and groundwater studies in the
Delta area.
We had the pleasure of visits from a number of distinguished
scientists from various parts of the world. The Department of Anthropology
held a field course for one month and groups from Botany and Zoology stayed
at the Station for shorter periods of time.
The following staff, students and technicians spent all
or part of the summer at the Field Station:
FACULTY
J. M. Walker
G. G. C. Robinson
J. Wright
C. T. Shay
R. M. Green
GRADUATE STUDENTS
T.O. Acere (Zoology)
H. Bauer (Psychology)
D. Bernard (Zoology)
D. Brown (Botany)
L. H1ynka (Zoology)
M. Fenton (Earth Science)
D. Lutchman (Earth Sdence)
M. McNicholl (Zoology)
F. Phillips (Botany)
SUMMER ASSISTANTS
W. Dentry
L. Hendzel
T. Hochbaum
J. Leberdensky
P. Lemon
K. Machniak
R. Moyshenko
T. Sulymko
G. Vascatto
J. Yarysz
C.K. Yeung
The first project started in early April, and from then
until mid-September the accommodation was used for 265 resident-weeks
with 4,269 meals being served! There are two projects continuing
throughout the winter. Seminars
A weekly programme of seminars and films was held in June
July and August , and we were privileged to hear lectures from
Dr . L. Rudescu (Roumania), Dr . R. Nero (Manitoba Museum of Man and Nature),
Dr . R. Miller (Yale University) , Mr . L. Gray (Water Control and
Conservation , Department of Mines and Natural Resources), Dr . J. M. Walker
(Botany, University of Manitoba), Dr . E. S. Burch (Anthropology,
University of Manitoba), Dr. G. G. C. Robinson (Botany, University of
Manitoba), Dr . D. Schindler (Fisheries Research Board, Winnipeg), and
Dr . G. Brunskill (Fisheries Research Board, Winnipeg). We welcomed
the participation of members of the Delta Waterfowl Research Station at
these seminars and appreciated their invitation to attend the two-day
Seminar on "Spacing Mechanisms in Waterfowl" and their July and August
seminar series.
At the 3rd November Seminar fifteen research summaries
were presented, including reports from Mr . F. Austin and Mr. P. Ould,
graduate students in the Department of Zoology who carried out their work
at the Delta Waterfowl Research Station. The seminar attracted about
80 people, promoted discussion and is now well established as an important
part of the Field Station programme . Brief summaries of most of these
projects form the major part of this Annual Report.
Courses
Anthropology 76.662
A small Archaeological Field School led by Prof. C. T. Shay
of the Department of Anthropology was held during the month of July.
The class surveyed for archaeological sites in the area and spent two
weeks excavating a small campsite on the Bell Estate. The campsite,
located on a small beachridge, yielded stone artifacts and pottery dating
between 1300-1600 A. D. We would like to extend to Mr. P. Ward our
appreciation for permission to excavate this site and for helpful
assistance throughout the course.
Comparative Chordate Zoology 22.220 and Plant Kingdom 1.220
Dr . G. Ross and Dr. B. Young respectively spent useful
days at the Field Station with their students.
Introductory Ecology (Botany 1.336 and Zoology 22 . 334)
Three sections each of 3 1/2 days duration were organized
by Drs. J. Gee, J. M. Stewart. J. M. Walker and J. F. Wright, assisted
by Mr. D. Bernard. Two sections were held in Registration Week and one
the following weekend. During the course, the students were introduced to
a variety of habitats, sampling techniques and methods of assessing
environmental parameters, which give an insight into the structure and
functioning of ecosystems .
2 Plant Ecology 1.452
Drs. J. M. Stewart and J. M. Walker organized a weekend
course in Plant Ecology with emphasis upon ordination and sampling
techniques as an aid to plant community description.
Advanced Taxonomy 1.442
Dr. R. Longton conducted a weekend course during which
intensive collecting of critical groups from a range of habitats
was undertaken. The collections were for analysis later in the term.
Marsh Ecology 1.721
The Marsh Ecology course spent a weekend at the Station
with Drs. J. M. Stewart and J. M. Walker, and examined the plant
communities =rom the lakeshore to the forested ridge and from the
wet meadow to the marsh. Materials were collected for plant and soil
analysis, calorific determinations, etc.
Visitors
We had the pleasure of visits from members of a number
of other Universities and institutions: Dr. T. Pritchard (Nature
Conservancy, U.K.), Dr. D. Bellamy (Durham), Dr. L. Rudescu (Bucharest,
Rumania), Dr. K. Patalas (Freshwater Institute), Dr. Bilden (Macdonald
College), Dr. D. Pimlott (Toronto), Dr. G. Ross (Southern), the members
of the Board of Trustees of the North American Wildlife Foundation,
Dr. B. Kendrick (Waterloo), Miss V. Humphreys (National Museum, Ottawa)
Miss M. Dwyer (National Parks, Ottawa), Mr. E. Carp (International Wildlife
Research Bureau), Dr. A. Johnson (Hendrix College), the members of the
11th Delta Waterfowl Research Station Seminar, Dr. G. MacLachlan (McGill),
Dr. J. Burnett (Glasgow), Dr. H. Dale (Guelph).
Special Events
There were three events worthy of special mention. On
August 14th, Dr. H. H. Saunderson officially opened the new laboratories
at the Station, when we were happy to be joined by friends from the
University, Provincial Government and others. A tour of the facilities
and displays by graduate students helped to make the day a memorable
one.
The Biology Division Picnic in July was the occasion for
a gathering of more than eighty for a beach celebration which became
the merrier when driven indoors by rain.
Perhaps the marathon social event was a barbeque supper
for the 128 participants at the International Coregonid Conference on
August 27th, accompanied by suitable musical revelry.
3 Buildings
During the winter and spring two cottages were built
east of Mallard Lodge and Murrays Cottage was renovated . The transformation
of the latter was completed with the assistance of graduate students
armed with paint brushes and permitted the building to be used for the
Archaeology Field Course. The Bell House was converted into a laboratory
by Dr. Robinson and Dennis Brown. However, despite this increase in
facilities, the basement of the lodge was in constant use as a laboratory.
A site plan and survey was prepared during September to enable future
expansion to take place on an orderly basis.
I would like to express appreciation for the efforts the
Provincial Government made to acquire for the Field Station two housing
units from the Macdonald Airfield. These will be brought to Delta during
the winter and will provide the laboratory and living accommodation which
is essential if an expanding programme of research and teaching is to
be carried out at the Field Station.
General
We are grateful for the opportunities afforded to us to use
the Bell Estate for various projects and for the friendly co-operation
extended to us by the members of the Delta Waterfowl Research Station.
Thanks are also due to the Portage Country Club for allowing us to use
their property for study' purposes.
To all departments of the Provincial Government upon whose
jurisdiction we impinge, warm thanks are extended for their many
kindnesses.
I would like to thank all the staff for their help during
the season and look forward to an even more successful year in 1970
Personal Papers (MS 80-0002)
No full textLetter from Isaac H. Kempner to E. S. Marsh expressing his congratulations and wishes
The University of Manitoba Field Station Delta Marsh 1971 Annual Report Number 6
No full textThis year saw a wide range of research and teaching at the Station
and consequently heavy demands on the facilities. Eight projects were
undertaken, four continued froin the previous year and four new studies
were initiated. The first group included investigations of habitat and
food use by white-tailed deer; the relationship between evapotranspiration
in PhJr..a..gmUe6 and water table fluctuations; the ecology of the hardand
soft-stem bulrush (Sc£npU6 aQutuh and S. validU6) and the effect of
the Assiniboine Diversion on the southern end of Lake Manitoba. New
research projects covered an equally wide range of topics, namely:
life cycle studies of two nematodes (Rhabdi~ sp.) in frogs and toads;
a survey of soil and water fungi in the marsh; the effect of fire on
P~agmUe6 and the mapping of lakeshore vegetation.
It is a pleasure to acknowledge the continued financial support from
the Department of ' Mines, Resources and Environmental Management, the
National Research Council, Ducks Unlimited, Canadian Industries Limited
and the University of Manitoba. In addition, this year two of our summer
assistants were supported by the Opportunity for Youth program.
We were pleased to welcome two other researchers: Mrs. C. H. Nelson,
who spent three days continuing her work on downy ducklings, and Dr. B.
J. Richardson, who collected blood samples from redbacked voles and deer
mice for enzyme studies.
Four projects were concluded in 1971. T. O. Acere was awarded an
M.Sc. for his stickleback population study, while D. Bernard and D. Brown
should complete their M.Sc. theses in the spring of 1972. Dr. J. Wright's
ecological study of benthic fauna has yielded a wealth of information,
particularly with respect to the effects of freezing on invertebrates.
His publication should be in press in the near future. The importance of
winter research is also emerging from the white-tailed deer studies of
Dr. E. Kucera. Our long-term objective is to obtain an understanding of
the dynamics of the marsh ecosystem, and each project brings it a little
nearer.
The Station was used for 334 resident-weeks. The following staff,
graduate students and techni ci ans were present for a 11 or part of the
summer:
Faculty
Dr. J. Gee (Zoology)
Dr. E. Kucera (University Field
Station)
Dr. J. M. Shay (Director)
' Graduate Students
A. J. Macaulay (Botany)
E. E. Mowbray (Botany)
J. Pearn (Botany)
F. Phillips (Botany)
M. Quaye (Zoology)
Station Staff
Mr. N. Mulder
Mrs . G. Mulder
Mrs . I. Garnham
Miss P. Wickstrom
Summer Assistants
T. Cantlon
G. Connor
R. Gray
R. A. Janusz
L. Landreth
D. Paton
R. Scarth
Informal seminars were given by the staff and graduate students, and
we were glad that members of the Delta Waterfowl Research Station joined
us and also reciprocated the invitation
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