BEN |
BOTANICAL ELECTRONIC NEWS |
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ISSN 1188-603X |
No. 357 February 16, 2006 | aceska@telus.net | Victoria, B.C. |
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Analysis and Classification of Ecological Data Using JUICE Software: How to Use the JUICE Package in Combination with Turboveg, Twinspan, PC-ORD, MULVA, SYN-TAX, D-MAP, CANOCO and Others to Extend the Possibilities of these Programs
The workshop will be conducted by Dr. Lubomir Tichy, Department of Botany, Masaryk University, Brno, Czech Republic
Description: This three-day course will combine lectures with hands-on application to teach the basic concepts and advanced features of the JUICE 6.3 freeware, computing package based on the Microsoft WINDOWS platform. The workshop will include:
The workshop will be held at Alaska Pacific University and be
limited to 10 participants. Cost of workshop: $200 (a special
price is available for fulltime students). Checks, Visa, or
purchase order should be made payable to "Alaska Pacific
University" and sent to: JUICE Workshop, Environmental Science,
Alaska Pacific University, 4101 University Drive, Anchorage,
Alaska 99508; telephone contact for payment is L. A. Piper,
Environmental Science Office @ (907) 564-8207; FAX (907) 562-
4276; email: Yukon Draba or Yukon Whitlow-grass (Draba yukonensis Porsild)
has more common names than populations. It is only known from
a single site in the vicinity of Haines Junction outside of
Kluane National Park. It was first collected in 1944 by Hugh
M. Raupand his wife L.G. Raup. In 1957 it was collected again
by Dr. Wilf Schofield and H.A. Crum from just outside their
tents while camping near the Alaska Highway.
This was likely the same site as where Raup had collected it 13
years earlier. At that time the collection was called Draba
oligosperma, a species which still grows in abundance in the
area. It wasn't until 1975 that the species Draba yukonensis was
recognized and its description was published by Alf Erling
Porsild, based on the collection made by Dr. Schofield. That is
all that was known about the species until 2005.
In 2000 a very enthusiastic amateur botanist from New York City
decided to come to the southwest Yukon and volunteer to look
for plants on behalf of Kluane National Park & Preserve. With
the knowledge of the approximate location and a short
description of the way to separate this species from 28 other
species of Draba in the area, Phil Caswell began searching.
His search came up fruitless, but he did discover that arctic
ground squirrels feed on the seed heads of Draba, often
consuming the entire above ground portion of the plant. Phil's
search raised the interest of locals and park staff alike. But
still no plants were found. Each year 100's of Draba
collections were examined from the area. Many new locales of
other globally rare Draba species such a Draba scotteri,
Draba ventosa and Draba porsildii were found but Draba
yukonensis remained elusive.
In the fall of 2004, Draba yukonensis was listed as Globally
Historic (GH); the only species with this designation at that
time in Canada. This is one step away from being declared
extinct. It was felt that after four years of searching and 47
years with no new collections, the population type locality must
have been lost; still there was hope that somewhere a new
population of this distinctive species would be found. In the
spring of 2005, Wilf Schofield provided precise directions to his
original collection site, which despite being near to the Alaska
Highway had not altered much in the subsequent 48 years. Just as
these new instructions were being emailed to the Parks office,
Phil and longtime park warden Lloyd Freese were on the search for
the elusive endemic Draba. Phil was showing Lloyd its closest
look alike, Draba cana, when Lloyd showed Phil some freshly
collected plants. To their great surprise they had rediscovered
the secret stand of Draba yukonensis, in the same location
that it had been found by others half a century before.
At that time 18 plants were counted in two small populations,
not counting the 3 that had been inadvertently collected.
However 4 days later only 13 plants could be found. It was
thought that perhaps some had been overlooked on the second
count as they are difficult to see and the vegetation had
advanced over the long days of the Yukon summer. By early June
the plants had gone to seed but by now only 8 plants could be
found. Photographs were taken of all the individuals to capture
some of their individual characteristics.
Arrangements were made to attempt to collect the maturing seed
and propagate them in the greenhouse of the University of Alaska
in Fairbanks. There was some concern that if these plants were
indeed the last of their kind, and the original description that
referred to them as biennials was correct, collecting the seed
could further jeopardize the population. However, when the
plants were surveyed again in late June to look for mature seed
it was discovered that all the plants had now disappeared. They
had likely become forage for the arctic ground squirrel.
In the fall of 2005, Dr. G.A. Mulligan with the Department of
Agriculture and Agri-food in Ottawa was reviewing collections
at the National herbarium (DAO). He discovered a fourth
collection made by G.W. & G.G.Douglas, in June 27th, 1973.
Two specimens of Draba yukonensis were mixed with nine
specimens of Draba cana; once again apparently from the type
locality. It remains to be seen whether the species has
survived. Further attempts to find individuals will be made in
the spring of 2006.
Sadly, soon after confirming the identity of his long sought
quarry, Phil Caswell passed away on November 12, 2005. He will
be sorely missed by his friends and colleagues, especially
those who had the pleasure to work with him over the last
20 years in Yukon and Alaska.
Japanese honeysuckle (Lonicera japonica Thunb. ex Murray) was not
reported for Ontario by either Soper and Heimburger (1982) or
Morton and Venn (1989), nor for Canada by Scoggan (1979). This
is not surprising since the earliest mention is that of Maycock
et al. in 1976 in an unpublished report. The earliest collections
of plants evidently established on their own in a natural
setting were the collection of C. A. Campbell in 1974 near
Scudder on Pelee Island in Essex County (CAN), followed by the
collection of Reznicek et al. in 1976 from Point Pelee in Essex
County (the basis for Maycock's report, specimen at CAN) followed
by the collection of M.J. Oldham on Cedar Creek in Essex County
in 1981 (TRTE). Since the shrubs of the Carolinian zone were
relatively well studied (e.g. Soper and Heimburger 1982), there
is reason to believe that it established in the natural
environment of Ontario only recently during the 1970s and 1980s.
By the early 1990s it had been found in several locations in
Essex county and near London in Middlesex County (MICH, TRTE),
Port Bruce Provincial Park in Elgin County (Oldham et al. 1993,
UWO), and in Kent County (MICH). The first collection from the
eastern Lake Erie region was from Fort Erie in 2000 (DAO). The
first published literature report for Ontario was that of Botham
(1981), with more recent published literature reports including
those of Oldham et al. (1993), Catling (1997) and Newmaster et
al. (1998). Although present and well-known in Ontario by1996, it
was not enough of a problem to be included by respondents to the
national survey of invasive plants (Haber 1996) and it was not
evaluated for the prioritized list of invasive alien plants of
natural habitats in Canada (Catling 2005). However, based on
current knowledge Japanese honeysuckle is clearly worthy of
evaluation. Thus the elaborate and detailed invasive species
assessment protocol (Morse et al. 2004), which was used to
generate Canada's list, was applied to it. Japanese honeysuckle
was found to be the fifty-third most significant invasive alien
of natural habitats in Canada (Catling 2005).
The invasive species assessment protocol developed by Morse et
al. ( 2004) includes 20 questions grouped into four sections:
Ecological impact (1), Current Distribution and Abundance (2),
Trend in Distribution and Abundance (3), and Management
Difficulty (4). Based on numerical scores a subrank is calculated
for each section. An overall I-rank indicating impact on native
biodiversity in the region of interest is then calculated from
the subranks.
With regard to Section 1, since Japanese
honeysuckle has only recently established, impact is limited and
scores for various factors are in the moderate to low range.
Notable aspects are influence on light availability and tendency
to overtop native vegetation. Since it occurs in parks and
protected areas containing significant biodiversity, the threat
is substantial but impact on native species in Canada needs to be
quantified.
Section 2 of the evaluation assesses current distribution and
abundance in the region. Since Japanese honeysuckle occurs only
in a small part of southern Canada within a single ecoregion and
its impacts occur over a small part of the current Canadian
range, the score for this section is low.
Section 3 evaluates trend and here Japanese honesuckle is highly
significant. High scores in this section indicate species with a
major potential to spread further and to cause greater damage.
The range of Japanese honeysuckle is expanding. Although it is
essentially confined in Canada to the Carolinian zone, a
restricted region of extreme southern Ontario, the plant
hardiness zone (5b) that it occurs in extends throughout much of
Nova Scotia and into southern British Columbia. Consequently,
less than 10 per cent of its potential Canadian range is occupied.
Expansion into this range could occur through dispersal by birds
and people, which is likely effective over long distances.
Finally, a doubling of atmospheric carbon dioxide could allow
Japanese honeysuckle to spread up to 400 km northward and to be
an even more serious competitor as a result of increased growth
rate (Sasek and Strain 1990, 1991).
The final section of the evaluation considers management
difficulty and here Japanese honeysuckle has a low to moderate
significance. Since it is semi-evergreen it can be readily
located in late fall and early winter for control applications,
but it does resprout readily after cutting.
In a case like this where an invasive plant scores very high in
trend and relatively low in management difficulty, it is
suggested that it can benefit from early detection and quick
action aimed at control or eradication. For more information on
Japanese honeysuckle see Nuzzo (1997) and Larson et al. (2006).
THE REDISCOVERY OF ONE OF CANADA'S RAREST PLANTS:
YUKON DRABA (DRABA YUKONENSIS PORSILD)
From: B.A. Bennett, NatureServe, Yukon
JAPANESE HONEYSUCKLE, AN ADDITION TO THE PRIORITIZED LIST OF
THE INVASIVE ALIEN PLANTS OF NATURAL HABITATS IN CANADA
From: Paul M. Catling(1), Brendon M. H. Larson(2), and Gerry
Waldron(3)
(1) Biodiversity, National Program on Environmental Health,
Agriculture and Agri-food Canada, Wm. Saunders Bldg., Central
Experimental Farm, Ottawa, Ontario, Canada K1A 0C6
[catlingp@agr.gc.ca ];
(2) Center for Population Biology, 2310 Storer Hall, University
of California, Davis, California, USA 95616
(3) 7641 County Road 20, R. R. #1, Amherstburg, Ontario,
Canada N9V 2Y7
References
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