What does it mean to “manage” bears?
“Bear
management usually refers to the process of monitoring populations and the
movements, behaviour, and habitat choice of bears in order to make
informed decisions about issues that affect bears.” 1
What are some
tools of the trade?
Managing bears also means managing
bear habitat, and the developments and
activities of people in it. Tools of
the trade include:
-
habitat
restoration: implementing prescribed burn or let burn policies to
restore high quality habitats, managing for habitat
effectiveness targets, etc.
-
involving “public”
in land-use planning
-
establishing guidelines for
industry: timber harvest guidelines, policies for industrial camps
and employees etc.
-
hunting management: setting bear harvest
quotas, disallowing hunting in populations that cannot
sustain it, etc.
-
human recreation management:
seasonal/temporary trail closures, re-routing trails to avoid prime bear
habitats, use quotas, concentrating human-use on established
trails, closing/decommissioning roads that provide access into
bear habitat etc.
-
education: educating residents, visitors and workers in areas occupied
by bears; target groups such as hunters,
back-country recreationists and etc.
-
bear-human conflict
management: educating people, food and garbage-management, aversive
conditioning, translocation, etc.
How can
science influence management and policy?
Herrero et al summarized key
factors that contributed to the successful integration of research
conducted by the Eastern Slopes Grizzly Bear Project into bear management
and policy in Banff National Park. These
factors include:
-
employing a multi-stakeholder and
interagency approach
to research
-
solid public understanding of the
issue was established before
discussing solutions
-
key decision makers were directly
involved in developing the Banff National Park management plan; they
understood the issues and were able to
contribute solutions
-
the scientific community provided
specific targets and goals in a way that could be incorporated
into policy
-
scientists
were persistent and provided information on a timely basis
(Herrero et al 1998)
With regard to the last point, the authors emphasized that
scientists who hope to influence policy and management must be actively
involved in the decision making process:
-
“Scientists cannot be
passive players, hoping that by publishing research results they will
influence decisions, or by writing the occasional letter, or by talking
to managers through the media, or pounding the table at public meetings.
Scientists need to adapt their behaviour to the process of information
gathering or decision making that is being used.” 2
Science and adaptive
management
“Active adaptive management
proposes application of different management tactics in time and space,
essentially as experiments, to develop a better understanding of the
behaviour of the system.” 3
In recent years, much effort has been directed towards the
construction of scientific models that attempt to simulate some aspect(s)
of ecosystem function. While such models are constrained by limitations in
data and by the enormous complexity of natural systems, they can be a
valuable tool when applied in the context of adaptive management.
Boyce explains this point with respect
to Population Viability Analysis modeling (PVA). PVA attempts to model the
fluctuations in an animal population that result from human-induced or non
human-induced changes in their environment over time. Boyce states that
“simulation models [such as PVA] can be used to generate hypotheses of how
we expect the system to respond to perturbations or management
manipulations”, and that monitoring of the consequences of these
manipulations “provides data to validate and/or refine” the model. 4
In other words, managers and scientists can use models to
predict the response of a natural system or population to a proposed
management action. Once they have actually applied this management action,
they can monitor the system’s or population’s actual response and compare
it to the response that was predicted by the model. If they are the same,
the model is validated; if they are different, the information can be used
to refine and improve the model for future applications.
Selected
examples
Human-use management at Lake O’Hara, Yoho National
Park
In the Lake O’Hara
area of Yoho National Park, a series of bear-human conflicts led to the
initiation of a three-year socio-ecological research project in 1993. The
project incorporated ecological and social data in a computer-based
decision support model “to provide recommendations to park management on
methods to resolve the land allocation issues between grizzly bears and
humans.” 5
Seasonal and
indeterminate trail closures, as well as voluntary limitations on trail
use are some of the management actions resulting directly from this
research.
Establishing ecological goals in Banff National
Park
The 1997 Banff National
Park Management Plan contains specific objectives that were developed in
response to grizzly bear research conducted by the Eastern Slopes Grizzly
Bear Project as part of the Banff-Bow Valley Study process. These
include:
-
reducing the number of grizzly bears
removed or killed as a result of human activity to less than 1% of the population
annually
-
establishment of habitat effectiveness
targets for each CMU [Carnivore Management Unit] based on the potential
for improved habitat effectiveness and visitor experience
considerations.
(Source: Herrero
and Gibeau 1999 and Parks Canada 1997)
Grizzly
bear harvest management in British Columbia
In 1989, the British Columbia provincial
government conducted a review of the grizzly
bear harvest. This research showed that between 1984-1988:
-
52 of 118 management units had
total kills that exceeded the annual allowable harvest.
-
overharvests of females
had occurred in an number of management units.
-
area-concentrated kills – especially of females – had occurred.
These results led to the adoption of the
following management principles:
-
maximum provincial harvest levels
should be ~4% of the total population, including kills from all
sources.
-
maximum sex ratio in the harvest
should be no greater than 1 female to 2 males.
-
the unreported kill (natural
mortality, accidental, illegal) is included in estimates of the total
kill and standardized at 50% of the legal kill unless documentation
indicates otherwise.
-
hunting seasons are not permitted
in management units that support 25 or less grizzly bears unless such
populations are contiguous with larger populations.
(Source for all: Ministry
of Environment, Lands and Parks, British Columbia 1995)
Footnotes and Sources
Cited