BEN # 265

Adolf Ceska aceska at victoria.tc.ca
Fri Mar 2 10:04:13 EST 2001


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No. 265                              March 2, 2000

aceska at victoria.tc.ca                Victoria, B.C.
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 Dr. A. Ceska, P.O.Box 8546, Victoria, B.C. Canada V8W 3S2
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MARSH CREATION IN A NORTHERN PACIFIC ESTUARY

This  is the abstract of the following article, posted here with
the permission of the Conservation Ecology:

Dawe, N. K., G. E. Bradfield, W. S. Boyd, D.  E.  C.  Trethewey,
   and A. N. Zolbrod. 2000. Marsh creation in a northern Pacific
   estuary:  Is thirteen years of monitoring vegetation dynamics
   enough? Conservation Ecology 4(2): 12.
   [online] URL: http://www.consecol.org/vol4/iss2/art12

Vegetation changes were monitored over a 13-year  period  (1982-
1994)  in the Campbell River estuary [eastern coast of Vancouver
Island, British Columbia, Canada: 50 deg. 02' N, 125 deg. 15' W]
following the development of marshes on four intertidal islands.
The marshes were created to  mitigate  the  loss  of  a  natural
estuarine  marsh  resulting  from the construction of a dry land
log-sorting facility. Plant species coverage was measured  along
23  permanent  transects  in planted and unplanted blocks on the
constructed islands, and in naturally  occurring  low-marsh  and
mid-to-high marsh reference communities on nearby Nunn's Island.

Five  dominant  species,  _Carex  lyngbyei_,  _Juncus balticus_,
_Potentilla pacifica_, _Deschampsia cespitosa_, and  _Eleocharis
palustris_  established  successfully  and increased in cover in
both planted and unplanted areas. The  planted,  unplanted,  and
Nunn's  Island low-marsh sites had similar total plant cover and
species richness by the 13th year. Principal components analysis
of the transects through time indicated successful establishment
of mid-to-low marsh communities on the  constructed  islands  by
the fourth year.

Vegetation  fluctuations on the constructed islands were greater
than in the mid-to-high and low-marsh reference  communities  on
Nunn's  Island.  Results  showed  that  substrate  elevation and
island configuration were major  influences  on  the  successful
establishment  and  subsequent  dynamics  of  created marsh com-
munities.

Aboveground biomass estimates of marshes on the created  islands
attained those of the reference marshes on Nunn's Island between
years 6 and 13. However, _Carex lyngbyei_ biomass on the created
islands  had  not  reached that of the reference marshes by year
13. Despite the establishment of what appeared to be  a  produc-
tive  marsh, with species composition and cover similar to those
of the reference marshes on Nunn's  Island,  vegetation  on  the
created  islands  was  still  undergoing  changes  that, in some
cases, were cause for concern. On three of  the  islands,  large
areas  devoid of vegetation formed between years 6 and 13, prob-
ably a result of water ponding.

Adaptive management has allowed us to  modify  the  island  con-
figuration through the creation of channels to drain these sites
in  an attempt to reverse the vegetation dieback. These changes,
occurring even after 13 years, further underscore the  need  for
caution  when considering the trading of existing natural, heal-
thy, productive wetlands for the promise of created marshes that
may or may not prove to be equal to the natural systems.

Where marsh creation is warranted, we recommend that  management
of  created  marshes be adaptive and flexible, including a long-
term monitoring program that should continue at least until  the
annual  variation  in vegetation of the created marsh is similar
to that of natural, nearby systems.


RE: MONITORING AIR QUALITY WITH LEAF YEASTS - _SPOROBOLOMYCES_
From: David Richardson <david.richardson at STMARYS.CA>

Please note that 1 cm discs of leaves give more reliable than  5
mm  leaf  discs.  We only used this in one study as 5 mm cutters
were widely available for collaborating schools.  However  1  cm
cork borers or punches give statistically more reliable results.

I  would  be  most  interested  to  hear what sort of leaf yeast
colony numbers occur on the west coast,  eg.  on  ash  or  maple
leaves. 

Here  on  the  east coast [in Nova Scotia] numbers are very much
lower than in the British Isles possibly because of the lack  of
grass as a winter resevoir for the leafyeasts.


LIFE OF BOTANIST LOUIS F. HENDERSON
From: Rhoda Love <rglove at OREGON.UOREGON.EDU>

New  Publication  in the Northwest Plant Hunters Series: Life of
Botanist Louis F. Henderson

The Native Plant Society of Oregon proudly announces the  publi-
cation  of  NPSO  Occasional Paper Number 2, "Louis F. Henderson
(1853-1942): the Grand Old Man  of  Northwest  Botany,"  by  Dr.
Rhoda M. Love of Eugene.

The  peer-reviewed paper has been formatted as a 64-page booklet
with 56 historic and modern images --  many  never  before  pub-
lished.  It  is  carefully  researched, with 133 notes. Also in-
cluded are a chronology of Henderson's life, notes  on  many  of
his  important  collections,  a  list of his publications, and a
list of plants named for Henderson.  The  research  took  nearly
three  years  and  extended  throughout the Pacific Northwest as
well as to Mississippi, Cornell University,  The  Chicago  Field
Museum, the Smithsonian Institution, and the Jepson Herbarium at
Berkeley. The Occasional Paper is a much-expanded version of Dr.
Love's  earlier  essay  on  Henderson  which appeared in Pacific
Northwest Quarterly last year.

Henderson lived through the Civil War in Mississippi only to see
his lawyer father murdered in New Orleans during the Reconstruc-
tion period. Young  Louis  was  educated  at  Cornell,  studying
botany under David Starr Jordan, later President of Stanford. He
came  west  in  1874  and moved to Portland in 1877 to take up a
teaching post. He began his botanizing in Washington and  Oregon
at  that time. Soon after, Henderson married fellow teacher Kate
Robinson and the couple had two daughters. Henderson had several
careers in botany in the Northwest including that  of  Professor
of  Botany  at the University of Idaho from 1893 to 1908. It was
during this time that his herbarium burned,  destroying  an  es-
timated  85,000  specimens.  At the age of seventy-one he became
Curator of  the  Herbarium  of  the  University  of  Oregon  and
remained for 15 years, greatly increasing the collection.

The  Native  Plant Society of Oregon, a non-profit organization,
has advanced funds for the printing and mailing of 200 copies of
the Henderson Occasional Paper. The Native Plant Society  wishes
to  recoup  its investment in a timely fashion, thus mail orders
will be accepted starting immediately. The cost is US$10.00  per
copy  which includes mailing and handling. Orders will be filled
as soon as received.

To order send a US$10.00 check, made out to NPSO, to: Occasional
Papers,  Native  Plant  Society of Oregon, P.O. Box 902, Eugene,
Oregon, 97440-0902. Please include your full return address.

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