4 or 5 female wolves on Isle Royale?
Will breeding take place to stop
extinction?
wtip.org
genetic information has identified
additional female wolves at Isle Royale
National Park. The wolf population has
been the topic of considerable debate in
the past year. In early 2012, observations
from long-running research by Michigan
Technological University suggested there
was only one female wolf left on the island,
raising the question of how soon wolves
might go extinct on Isle Royale.
The need to further understand the
population issue led to genetic analysis
to decipher the number and sex of individuals
in the actual population. The National Park
Service funded the majority of the analysis,
but the popular study also attracted support
from an internet funding initiative and a
leading US Geological Survey scientist and
wolf researcher, L. D. Mech. Prior inferences
about the number of female wolves on Isle
Royale had been made without the benefit of
genetic study. The results from the genetic
analyses, as well as field observations, suggest
that not one, but four and possibly five females
were present in February 2012, including some
that had been born the previous April.
Winter study is currently underway at the Park
and researchers are updating information on
trends in the population. Lead Michigan Tech
researcher John Vucetich commented, “genetic
considerations and tools, like those used to
estimate sex ratio, continue to yield considerable
insights about this population’s status.” Isle
Royale National Park Chief of Natural Resources
Paul Brown added, “we are still a ways off from
making any decisions about the future management
of wolves on the island, but these results are very
encouraging. We remain concerned about the
overall long-term health of the population and
this new information paints a very different picture
than what we thought last year. The results of this
year’s winter study will be factored in with the
genetics information during our on-going
review of the situation. “
The National Park Service is concerned the trends
generated by climate change have the potential to
trigger extinctions and isolation of many species
across public lands entrusted into the agency’s care.
In fact, Isle Royale is in the process of trying to
establish whether it has lost two species of fish
(Ciscos) that were endemic to deep and formerly
cold water inland lakes. A national team facilitated
by the Park Superintendent has been assembled
to review climate change scenarios and a series of
potential effects on wolves and other species at Isle
Royale.
As the team progresses, information about their
work will be available on the Park website,
www.nps.gov/isro. People who are interested in
commenting on this situation can contact the park
via mail or email at ISRO_Wildlife@nps.gov.
There will be additional opportunities this year
for the public to provide input to the discussion
of climate change effects and planning for the
future of wolves on Isle Royale.
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