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Re: Wisconsin Marten [Re: Pike River] #7358627
09/18/21 11:33 AM
09/18/21 11:33 AM
Joined: Dec 2010
Posts: 9,946
Armpit, ak
D
Dirt Offline
trapper
Dirt  Offline
trapper
D

Joined: Dec 2010
Posts: 9,946
Armpit, ak
Of the 45 fishers radiocollared, 14 are still being monitored (8F, 6M), 3 are missing, 10
shed their collars due to belting design failures, and 1 collar was removed at the time of
recapture due to neck abrasion. In addition, 3 juvenile males were ear-tagged only. Of the 14
known deaths (8F, 6M), 1 was struck by a vehicle, 1 was accidentally trapped out of season, 2
were legally trapped, 2 died from unknown but apparently natural causes, and 8 (6F, 2M) were
killed by other predators (scavenging by an eagle can’t be ruled out in 1 case).
Although sample size is small, all predation mortality of fishers took place from March –
May (Figure 3), and very rarely was any portion of a dead fisher consumed. Five of the 8
predation deaths, all females, were by mammalian predators. In one case, bobcat was
confirmed via trail camera placed at the site a fisher was cached. We are awaiting forensic
results for several other cases. Bald eagles are suspected in 2 of the 3 raptor predation events,
both of male fisher, though as noted above we can’t rule out scavenging in 1 case (only the
radiocollar was retrieved directly underneath an active eagle nest). The third raptor predation
involved a female fisher, likely attacked by an owl or hawk.
Of greatest significance, all 6 of the female fishers killed by other predators were adults,
and 5 of the 6 were killed while they still had dependent young in natal dens, indirectly resulting
in the death of their 14 kits. We suspect that energetic demands faced by adult females with
kits (i.e., lactation, and shortly after the energetically demanding winter) force them to increase
their activity in search of food, and preliminary data from temperature data loggers on
radiocollars suggests this to be the case. In addition, activity likely increases as a result of
breeding activity in the weeks following parturition, and all the increased activity occurs at a time
when concealment cover is diminished (i.e., before ‘green-up’), thereby exposing them to
increased predation risk. Regardless of the explanation, and acknowledging the limited sample
size, it seems unlikely that the high level of predation on nursing females is sustainable, which
may partially explain the recent decline in fisher abundance. However, the correlates to the
timing of predation mortality that we have mentioned are not new challenges for adult female
fisher, and the population appears to have been in decline only for the last ~ 6 years,
suggesting that other factors may be ‘altering the system’. It remains unclear whether the fisher
mortality pattern we have observed to date is consistent with past dynamics, and if not, whether
the underlying explanation is related to comparativel
y short- (e.g., periodic fluctuations in prey)
or long-term (e.g., deteriorating habitat quality) changes affecting fisher energetics/activity, or
relatively rapid changes in the predator community (e.g., the increased bobcat population)


Who is John Galt?
Re: Wisconsin Marten [Re: Pike River] #7358634
09/18/21 11:46 AM
09/18/21 11:46 AM
Joined: Jan 2009
Posts: 2,100
Idaho, Lemhi County
G
Gulo Offline
"On The Other Hand"
Gulo  Offline
"On The Other Hand"
G

Joined: Jan 2009
Posts: 2,100
Idaho, Lemhi County
Thanks Dirt. Great information.

Jack


Re: Wisconsin Marten [Re: Pike River] #7725604
11/24/22 12:28 AM
11/24/22 12:28 AM
Joined: Jan 2016
Posts: 9,188
WI - Wisconsin
A
AJE Offline
trapper
AJE  Offline
trapper
A

Joined: Jan 2016
Posts: 9,188
WI - Wisconsin
Has anyone seen 1 lately?

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