I wanted to get these up earlier but was having such a great time catching up on various biological at YNP that I lost track of time.
Here is the
YNP's Northern Range Elk Count Report of 2014-2015. I had talked with them about this in early February as a result of a news article quoting FWP wildlife biologist Karen Loveless talking about an increase in the Northern Yellowstone Elk herd, which had been in a decline for the last 10 years.
Here is
FWP's 2015 Late Winter Classification of Northern Yellowstone Elk by Karen Loveless, the FWP Livingston wildlife biologist
This situation with the elk tags has been a longtime coming, it is not a sudden thing, they had already planned on it from the papers produced in Jan. 2015.
Pg. 2 of the FWP report states Bull ratios ranged from a low of 12.1 bulls per 100 cows within Montana, and The observed ratio of 15.2 total bulls per 100 cows is very similar to results of 15.8 bulls per 100 cows observed in 2013, and lower than the 21 - year average of 29.1 bulls per 100 cows. The observed ratio of 6.5 brow - tined bulls per 100 cows is the lowest observed since surveys began, however the observed ratio of 8.7 yearling bulls per 100 cows is above recent and longterm averages (Table 2, Figure 4).
"The 2015 results of 8.7 yearling bulls per 100 cows indicate increased yearling survival as compared to surveys conducted during 2008 - 2013 which resulted in ratios ranging between 2 – 5 yearling bulls per 100 cows.
In spite of this observed increase in yearling bull ratios, mature bull ratios for the entire herd declined this year to an all time low of 6.5 brow-tined bulls per 100 cows. Mature bull ratios within the Montana portion have remained stable at 2.7 – 3.1 brow-tined bulls per 100 cows for 3 years, having increased slightly from the low of 0.8 brow-tined bull per 100 cows observed in 2012. Harvest of brow-tined bulls has increased in recent years in spite of the long-term decline in elk numbers; the most recent 10-year average is higher than the long term average, and the 2014 harvest of 315 brow-tined bulls is the highest harvest since 2006 and the second highest harvest since 1994.
The increased bull harvest corresponding with reduced overall elk numbers results in an increasingly greater proportion of the bull population being harvested annually (Figures 5 & 6)."
Page 3, "In response to declining bull ratios and increased vulnerability to harvest, MFWP instituted an unlimited permit season structure in HD 313 beginning in 2012, and further restricted the structure in 2014 by designating the permits as “first-choice only” for applicants. In spite of the increasingly restrictive season structure, brow-tined bull harvest has continued to increase. During fall of 2015 MFWP will be developing proposals for season structure changes for the 2016-2017 seasons."
In the YNP report, page 2, "Predation by wolves and other large carnivores (i.e. grizzly bears, black bears, cougars), past human harvests of antler-less elk during the Gardiner Late Hunt, and drought effects on maternal condition and recruitment were indicated as the primary factors contributing to the decreasing trend during 1995-2005. To reduce hunter mortality on female elk, Montana Fish, Wildlife & Parks reduced the number of antler-less permits for the Gardiner Late Elk Hunt from 1,102 in 2005 to 100 per season during 2006-2010, and eliminated this hunt beginning in 2011. Although lag effects from harvests may continue for some time, these reductions should increase the survival of prime-aged females with their high reproductive value and recruitment of calves into the breeding population into the future. Also, a substantial decrease from 94 to 42 (~47% decrease) wolves occurred on the portion of the winter range for northern Yellowstone elk inside the park during 2007-2014 due to intra-specific strife, food stress, and disease. This decrease suggests the wolf population may be beginning to respond numerically to decreased elk availability...
The winter distribution of northern Yellowstone elk has changed since 2008, with more than one-half of the counted elk being observed north of Yellowstone National Park. Possible reasons for a high proportion of elk migrating to this lower elevation winter range include milder environmental conditions (e.g., less snow) and better forage availability. Wolf densities and the cessation of the late hunt may also be factors influencing the winter distribution of elk."