 | American Marten as a Focal Species
This summer AFER continues its study of the habitat needs of American marten, a member of the weasel family that is thought to require mature or old growth forest for its survival. Because of its dependence on older forests we are using the marten as a focal species in wildlife corridor design. Our study area for 2003-2004 is the Rabbit Lake watershed. |
|
We study the marten using a non-invasive technique known as track plates. Marten are drawn to the track plates by a bait (we use chicken), they cross a metal plate covered in black soot, and then sticky paper where they leave a footprint as they move toward the bait at the far end of the track plate. We surveyed marten in a total of ten sites over the first season including one site from each decade of historical logging from 1960 to the present, a mature conifer and a mature hardwood site, and three old-growth sites. Marten were detected at 7 out of 10 sites including the 1990, 1970, and 1960 logged sites, both mature hardwood and conifer sites, and two of the old-growth sites. Marten were not detected at any track boxes occurring in recent clearcut, seed tree or selective cuts. Marten detections at the 1990's logged site occurred in an intact shoreline reserve characterized by a mature birch/poplar forest and at the edge of the shoreline reserve and a selective fuel wood cut.
|  |
Track plates with marten detections were associated with a greater live tree basal area, a greater basal area of trees greater than 10 meters in height, and greater overhead cover. Detections were also associated with structural features associated with stand maturity such as greater horizontal and vertical forest structure contributed by higher volumes of downed woody debris characterized by large diameter logs and a greater basal area of snags. The 1960 and 1970 logged sites had structural characteristics similar to the mature and old-growth sites that we sampled due to large diameter cut logs that were left on-site following harvesting. Marten were not detected at the 1980 logged site characterized by even-aged plantations of red pine and jack pine that lacked horizontal and vertical structure but had a high overhead cover. Marten detections were associated with higher deciduous overstory species composition, and a greater proportion of track boxes in mixed-deciduous and deciduous forests received detections.
In addition, we detected marten in FEC ecosites 17 (Poplar-White Birch) and 27 (Sugar Maple-White Birch-Poplar-White Pine), which are currently rated as unsuitable habitat by the OMNR marten habitat suitability index model. This model is used in implementing the guidelines for the provision of marten habitat in forest management planning in the Temagami Forest Management Unit. Ecosites 17 and 27 were found at the 1990's and 1970's logged sites as well as the mature hardwood site. Only the 1970's and mature hardwood sites received detections at all six track plates within the sample array, and these two sites received the greatest number of detections over the 12 day sampling period. Detections occurred in stands ranging in age from 23 years to 150 years according to Forest Resource Inventory data.
Our results, although preliminary, suggest that marten may use a wider range of forest types, including deciduous forest, than had been observed in boreal Ontario and Algonquin Provincial Park, and that features related to stand maturity may be available in younger logged forests as a legacy from the harvested forest, depending on the successional stage of that forest, the intensity of disturbance and the amount and size of residual material retained.
Sampling will continue this summer in the northwestern portion of the Rabbit Lake watershed which includes the Muskego Wildlands which have yet to be disturbed by logging but are slated for harvest in the new forest management plan. The results of this study, when completed, will be used to:
- Describe the habitat associations of marten in the northern Great Lakes-St. Lawrence Forest Region
- Refine the design of the Temagami to Algonquin Wildlife Corridor
- Evaluate the current marten habitat suitability model used by the OMNR
Corridor and Representation Studies (1996-Present)
In 1996 AFER turned it's attention to the need for Conservation or Wildlife Corridors in Ontario, and has since pioneered work on two such Corridors : the Superior-Temagami corridor and the Temagami-Algonquin corridor, and has participated in the design of a third one, the Algonquin to Adirondack (A2A) corridor.
Why we Need Corridors
The increasing loss of biodiversity is a challenge
that we must address now or risk waiting until it is too late. Increasing pressures on the natural environment, such as deforestation, global climate change and habitat fragmentation are causing the irreversible decline of the earth's biological diversity, including species extinction and destruction of ecosystems. One way to preserve biodiversity is in parks and protected areas, however, no parks in North America are large enough to sustain themselves unless they stay connected to each other and to other wildlands (Noss et al., 1997).
That's where corridors come into the picture. After defining core areas for protection and putting buffers around them, we need to establish connectivity between these reserves or else they may become ecologically dysfunctional islands in the landscape Conservation corridors were initially
conceived mostly to allow the movement of animals with large space
requirements, such as larger predators. A pack of grey wolves, for
instance, uses from 250 to over 2000 square kilometres of land; a black
bear uses a home range of about 150 square kilometres. To maintain
long-term populations of these species even the largest parks need to be
linked to other wild areas (Noss et al., 1997). Even relatively small
inputs of genetic material into a population can dramatically increase the
persistence of a population, and allow species to survive in reserves that
would otherwise be too small (Forbes, 1993).
Less obvious species, such
as plants or insects also need connectivity to be able to adapt to changing local conditions, and for genetic exchange between populations. Corridors that facilitate the movement of plant and wildlife species will help ecosystems adjust to the changing global climate; the predicted increase in climate will cause forest regions in North America to shift northward. Climate models predict that the southern edge of the boreal forest could shift as much as 500 km north because of climate change over the next century, and some species may be extirpated or become extinct if they can't migrate fast enough to match changing conditions.
How a Conservation Corridor Might Look
Connectivity can be much more diverse than people often imagine. Corridors generally follow the landscape and not straight lines, they may be a mix of modified management, parks, core areas, and buffers - with one thing in common, they connect. No park should exist in isolation; somehow it should connect with all the others. Successful corridors must be large enough to be used as habitat by the animals that move through them - particularly if the corridors cover long distances. And since corridor boundaries are designed around key natural features, and link up small and large natural heritage areas, they are often not of a consistent width. Generally, wider corridors allow more species to use them (Forbes, 1993); corridors should be as wide as possible, and in some cases this may be achieved by having central protected areas buffered by areas of modified management.
Corridors can fulfill many needs - their raison d'etre is usually to provide maximum flow of genes, species, energy and material between core reserves. But they also can serve for scientific research, to protect ecologically representative and cultural heritage areas, and for recreation. Good examples of the recreational value of corridors are the Bruce Trail that runs along an important natural corridor, the Niagara Escarpment, and the proposed Superior-Temagami corridor, which follows a long-distance canoe route, and was paddled by Joan and Gary McGuffin in 1997.
Designing and Implementing Corridors in Ontario
There are at least four corridors in the initial stages of development in Ontario, two of which were conceived by Ancient Forest Exploration & Research. These are the Superior-Temagami corridor, the Temagami-Algonquin corridor, the Niagara Escarpment, and the Algonquin to Adirondack, an international corridor. Many more are needed.
On a smaller scale, corridors are now being considered in forest management plans as a new management tool. In 1996 the Ontario Ministry of Natural Resources proposed genetic linkages, corridors of mature or old growth conifer, to facilitate the movement of species that prefer old growth (e.g. lynx marten, fisher, wolf). How effectively this strategy will be implemented by the MNR remains to be seen, since so far no corridors have been put in place. In any case the strategy was proposed only within the Temagami Comprehensive Planning Area. Another example of very simple corridors are waterway parks. But because right now waterway parks are usually only 200 m wide strips along each bank of the river, sometimes less, they are not viable for the movement of most species over long distances. Corridors that are too narrow can sometimes even be detrimental to species that use them, because of high edge effect and corresponding predation.
Achievements to Date
- Mapping ancient forest areas greater than 20,000 hectares in the Temagami Site
Region and proposing an approximate route for the Superior-Temagami Corridor based on
these core areas (see MAP).
- Using GIS analysis to map habitat quality in south-eastern Ontario (see MAP), and determing
the the ideal (least-cost) path for wildlife movement in the Canadian portion of the Algonquin to
Adirondack corridor. (see MAP or REPORT).
- Using GIS mapping to chart the path of the Temagami-Algonquin corridor
Selected References
Forbes, G.J., 1993. The Preservation of Genes, Populations and Habitat Specialists in Natural Heritage Areas. pp. 34-46 in Size and Integrity Standards for Natural Heritage Areas in Ontario (proceedings of a seminar). Provincial Parks and Natural Heritage Policy Branch, Ontario Ministry of Natural Resources. Poser, S.F., W.J. Crins and T.J. Beechey, editors.
Noss, R.F., M.A. O'Connell and D.D. Murphy. 1997. The Science of Conservation Planning. Island Press, Washington, D.C., Covelo, California. 246 pp.
Ontario Ministry of Natural Resources. 1992. A Natural Heritage Areas Strategy for Ontario, Responding to the Endangered Spaces Challenge. Draft For Discussion. Provincial Parks and Natural Heritage Policy Branch, Policy Division.
Ontario Ministry of Natural Resources. 1996. Strategies for Implementing the Comprehensive Planning Council's Land Use Reccomendations.
White Pine Regeneration
In 2001-2002 regeneration of white pine forests was studied. White pine forests have suffered from a combination of historical over-extraction, and fire suppression which affects regeneration of the species. White pine is one of eastern North America's largest tree species, and white pine forest is a preffered habitat for a variety of wildlife. A report of our initial findings will be available soon.
Riparian Ecosystems
In 1999-2000 the riparian area around streams was studied, with the aim of achieving further recognition and protection for these relatively fragile ecosystems. See Ancient Forest Research Report No. 25 for some of the results
Representation Studies
In 1997-98 AFER began addressing the problem of ensuring that all ecosystem types are
represented in protected areas. Currently, most assessments of representation in Ontario
are based almost exclusively on remote sensing data (eg Forest Resource Inventory maps made from aerial photos)
and surficial geology types. AFER has conducted field studies with the intention of
proposing more refined methods of assessing ecological representation.
|