Posts Tagged ‘Isle royale’

Trophic Downgrading or Where Have All the Predators Gone?


(Or, where have all the predators gone?)

  J.A. Estes, et al. (2011) The Trophic Downgrading of Planet Earth (2011) Science, 15 July, 333(6040) 301-306.

Summary and Comments by Ken Fischman, Ph.D.

This is a paper that is worth your diving into because the information it contains is important to the health of our planet. I will help you get through it by summarizing and commenting on it. You can either read the summary or skip directly to my comments on it at the end of this post. What is it about? It deals with the recent and rapid disappearance of top predators, such as wolves, lions, & sharks, mostly brought about by the actions of that top predator of all – mankind, and the surprisingly profound effects their loss is having on ecosystems worldwide.  It was the feature article in the July, 2011 issue of Science, one of the most prestigious scientific journals in the world. Among its 23 authors are: John Terborgh, Joel Berger, Michael Soule, and William Ripple. The former three are considered to be among the founders of the field of Conservation Biology, and Ripple is our foremost researcher into the effects of top predators on the ecosystems of North America. Simply put, a trophic cascade (TC) is the effect that the absence or abundance of a top or apex predator has on succeeding levels of the rest of the ecosystem. The authors have gathered a vast array of evidence showing that these losses lead to ever-increasing and widespread effects on other living creatures, on ecosystems, and on the Earth itself. Terborgh pioneered this type of study by showing the profound effects of the presence or absence of predators on the fauna and flora of isolated islands in the Barro Colorado, a recently flooded region near the Panama Canal. Soule, in a classic paper, neatly demonstrated how the presence or absence of coyotes effected the bird and cat populations within the urban canyons of San Diego. Ripple has shown the profound influence that the reintroduction of wolves in Yellowstoneand loss of mountain lions in Zion National Park  have had on the animals and plants in those areas. In this paper, these scientists turn their attention to the effects of predators on ecosystems worldwide and warn us of the present and impending dangers that our  steady & seemingly inexorable extermination of predators is having on the Earth

Summary of the Paper

 The loss of apex predators all over the world is having a pervasive influence on nature. There are cascading effects of the disappearance of predators. These “top-down forcings” (causes of variability) are having unanticipated effects, such as increase in disease, wildfires, losses in carbon sequestration, appearance of invasive species, and disruption of biogeochemical cycles. In its 4.5 billion years of existence, our planet has undergone several mass extinctions, with huge loss of biodiversity, followed by novel changes. We are now in the early to middle stages of a sixth mass extinction. Man has mostly caused these recent extinctions. Many of them are started by the removal of apex predators. These extinctions may be mankind’s most pervasive effect on the natural world. Extinction obviously means a permanent loss of these animals, which in turn often has a ripple effect, causing many other changes throughout the ecosystem. These widespread changes are what are referred to by scientists as “trophic cascades” (TCs). Some of the ultimate outcomes of TCs are: fires, disease, climate change, habitat loss, and pollution. Theory behind concept of TCs: (1)  An ecosystem is shaped by its top consumers (usually apex predators). (2)  Alternative stable states. TCs push a system, and it reaches tipping points. These are thresholds or breakpoints, and when they are reached, significant phase shifts occur. (3)  Connectivity – this is built around connection webs and through the mechanics of predation, competition and mutualism (organisms that have a supportive effect on each other), biologically, and through physicochemical processes. Cryptic nature of TCs: Species interactions are usually invisible under stable conditions. They may require years to become evident due to the long generation times of some species.  The effects usually do not become evident until after the loss. The scales of TC s can be much more vast than most feasible scientific studies can handle. Most field biology studies concentrate on small, discrete areas, and on non-motile species, with short generation times, making them easy to  manipulate. This results in an incomplete and distorted picture of apex predator influence. Hence, the authors have written what is called a mega study, which brings together the results of many other similar studies, using similar protocols & subjects. This enables them to combine the studies & to note general principles and draw important conclusions with more certainty. Widespread Occurrence of TCs: TCs have been documented throughout the world. When apex predators are reduced or removed, and sufficient time and space are accounted for, their influence becomes obvious. “Natural experiments” showing these effects are pervasive: e.g. loss of: killer whales, lions, wolves, cougars, sharks, sea otters.

These interactions are often complex. e.g. apex predators have little influence on megaherbivores:  Elephants, hippos, rhinoceroses, etc. in Africa are basically invulnerable to predation. Mostly, therefore effects are seen in the increase in smaller herbivores: e.g. Thompson’s gazelle, impala. Influence of apex predators on autotrophs (An organism capable of synthesizing its own food from inorganic substances, using light or chemical energy. Most plants are autotrophs): (a)  Increase of autotrophs – by suppression of herbivory (any animal that feeds mostly on plants), e. g. the loss of sea otters, which prey on shellfish,  have diminished the health of kelp forests. The extirpation of wolves from forests has resulted in a corresponding increase of ungulates adversely effecting other animals and plants in various ecosystems. e.g. the removal of wolves from what has become Rocky Mountain NP in Colorado has resulted in the overgrowth of elk, which in turn have devastated much of the plant life. (b) Decrease of autotrophs – e. g. large mouth bass by feeding on smaller fish, which feed on 200 kinds of plankton (microscopic aquatic plants & animals)  have decreased their numbers to such an extent in many mid western US lakes, that this has resulted in a loss of oxygen, leading to the demise of other life forms in these lakes. Herbivory and Wildlife: Increase in herbivory (mostly domestic animals that eat plants) has resulted in a change from grass lands to scrub lands, & the burning up to 500 million hectares (ha) in the global landscape and has released over 4,000 metric tons (Tg) of CO2 into the atmosphere. Diseases: e.g. Rinderpest (an infectious viral disease) in East Africa decimated ungulates. (animals like wildebeests & buffalos that chew their cud). This led to an increase in plant biomass, which in turn led to wildfires. Vaccination and control eliminated Rinderpest and this led to the recovery of the wildebeests and buffalos. Because of this, shrub lands became grass lands, which reduced the frequency and intensity of wild fires.

e.g. Impacts of predatory fish on mosquito larvae: effects the incidence of Malaria. Physical & Chemical Influences: There is a linkage between apex predators & atmospheric CO2. e.g.  presence or absence of predatory fish in lakes can effect the production & uptake of CO2. e.g. whaling transferred 105 million tons of carbon from whales to the atmosphere. e.g. Extinction of Pleistocene herbivores reduced atmospheric methane & contributed to a drop of 9° C. temperature drop in the Younger-Dryas period, some 12,900 years ago. Soils: e.g. Herbivores profoundly influence soils. e.g. introduction of rats & arctic foxes in high latitude (mostly arctic) islands reduces soil nitrogen by disturbing nesting birds. Water: e.g. collapse of large demersal (bottom feeders) fish in the Baltic Sea led to a 20% decrease of silica in pelagic diatoms (one-celled organisms that make up the majority of plants found in the open sea). e.g. Yellowstone wolves protect riparian vegetation from over-browsing herbivores. This leads to more shade & cooling of streams, which in turn decreases streambed erosion & increases cover for fish & other aquatic organisms & leads to an increase in songbirds.

Invasive Species: Lack of top-down predators allows invasive species to spread. e.g. spread of the brown tree snake, originally from the Solomon Islands, on Guam, which has exterminated most of its birds, was due to lack of other predators, which could have held the snake population in check. e.g. reduced fish predation in the Mississippi River led to the invasion of zebra mussels. Biodiversity (Abundance of & diversification in living creatures): Biodiversity(BD) is now largely confined to protected areas (e.g. national parks, designated wildernesses). Loss of BD has been mostly caused by over-exploitation (hunting, fishing, increase of areas reserved to domestic & other ungulates, etc.) has led to habitat loss & fragmentation of ecosystems. e.g. over browsing by an increasing population of elk in Rocky Mountain NP is due to lack of natural predators,(i.e. wolves). The same situation occurred in: the Kaibab Plateau, adjacent to the Grand Canyon in Arizona, which was overrun with deer. Minnesota has a serious problem with areas overrun by more than 1 million deer. Princeton NJ had to employ sharpshooters to kill deer, which were overrunning suburban gardens. Deer (ironically) starved on Deer Island in San Francisco Bay due to their burgeoning population, which was unchecked by predators.  Mesopredators (coyotes) in San Diego canyons strikingly changed populations of songbirds and cats.

e.g. Sea Stars in intertidal areas interact with mussels, wiping out many species. e.g. loss of small vertebrates after the extirpation of wolves, cougars & bears in temperate & boreal North American forests changed the ecology of these forests. Effects of Tree Longevity: e.g. wolves & other megapredators were almost entirely eliminated in the US by the 20th century. At that time there began to be recruitment failure & reduced tree growth rate in many places (most obvious in national parks). e.g. wolves were eliminated 100 yrs. ago on Anticosti Island in mouth of the St Lawrence River. This led to a decrease in the number of saplings & an increase in graminoids (grasses), e.g. wolves were extirpated from the Scottish island of Rum 250 -500 years ago, resulting in total loss of its forest. It is now treeless.

Conclusion: “Best management solution is likely restoration of effective predator regimes.” [English translation: Bring back the predators] Paradigm Shift in Ecology: There is clearly a top-down forcing in ecosystem dynamics.  [We argue that ] “burden of proof be shifted to show for any ecosystem, that consumers do (or did) not exert strong cascading effects.” Conclusions: Unanticipated changes in the distribution & abundance of key species, as well as pandemics, population collapses, eruptions of unwanted species, major shifts in ecosystem states, are caused by altered top down forcing , brought about by loss of native apex consumers. Repeated failures to anticipate & moderate such events arise through  fundamental misunderstandings of their causes. Resource managers usually base their actions on the expectation that physical causes are the ultimate drivers of ecological change. “Top-down forcing must be included if there is to be any real hope of understanding & managing the workings of nature.”

 COMMENTS – Ken Fischman, Ph.D.

 I find it helpful in understanding TDG to picture a pyramid, with the predator at the peak or top & prey animals at several successive & increasingly wider levels, (indicating larger populations) underneath. For example, sharks are the top predators in our oceans & they prey on smaller fish such as tuna, which in turn prey on smaller fish like anchovies, etc. until the lowest & most fundamental layer is reached, which consists of microscopic plankton (autotrophs) & is effected in a profound way.

Along this line, I recently read a paper published in Nature by Daniel Boyce of Dalhousie University in which the author utilized hundreds of thousands of historical records to show that the clarity of most of our oceans has been greatly increasing in the past few years. This is an indirect but powerful method, showing that plankton populations are decreasing rapidly. Because plankton are the base prey in our oceans, their scarcity would adversely effect all fish populations & since they are the ultimate autotrophs (think of what would happen if their dry land equivalent, grasses, were to decrease considerably) tend to increase CO2. Such a profound worldwide change undoubtedly has more than one cause, but the disruption of world fisheries through the loss of top predators is probably a contributing factor.

It is easy to overlook the effects of some predators, either because they are not charismatic megafauna, like “lions & tigers & bears oh my!” or are out of sight much of the time. For instance, who would even thought of sea stars as predators? I know that I had not until recently despite my background in Zoology.  Yet it has been shown that their loss can have profound effects on shellfish.  And those cute little sea otters. Who would have thought that they have an important effect on kelp beds? The film, “Jaws,” which came out in 1975, gave sharks a bad name that they have yet to overcome. That, together with the insatiable appetite of Chinese & other Orientals for shark fin soup (Talk about waste. They cut off the fins & throw the shark carcass away) & the dislike of commercial fishermen for sharks, who they view as competitors, in the same way that many elk hunters view wolves, has led to their wholesale destruction. No thought was given to the sharks’ role as the ultimate apex predator in the sea & the  effect their demise is having on other fish lower in the TC pyramid. It is quite possible, even probable, that the loss of many commercial fish species is linked not only to overfishing but also to the destruction of sharks, which has upset the ecological balance in oceans. In this connection, commercial fishermen may be doubly responsible for the serious depletion of fisheries worldwide, through their overfishing & destruction of apex predators.

My own studies on wolves and as an advocate for them has given me a fresh perspective on their importance in maintaining healthy forests. In this respect, the authors’ citing of studies showing that the eradication of wolves changed the flora of Anticosti Island in the St. Lawrence estuary & deforested the Scottish island of Rum, is instructive & worrying.

We do not however, need to go to the ends of the earth to find examples of TDG. In my own little part of northern Idaho, we have seen the results of overfishing in Lake Penderay, invasive species like spotted knapweed & the infamous zebra mussels, and loss of biodiversity caused by overpopulation of elk in the Clearwater NF. There are a substantial number of elk hunters in the state of Idaho, whose idea of heaven seems to be forests containing only elk & hunters. One of their leaders recently stated that he would only be satisfied when hunters success rates reached 90% Success rates throughout the Northwest have been historically at around 18 -20% (Spokesman Review 2/22/08). Idaho already contains over 100,000 elk. He apparently wants to turn Idaho into an elk farm, where hunters do not even have to get off their ATVs to kill elk. I doubt that many other Idahoans would agree with that vision. These hunters & the politicians who support them are responsible for the present vendetta against wolves, which in the last year has resulted in the killing of around 429 out of only 760 wolves in this state & the extension of the wolf hunt to year around, a hitherto unheard of strategy for “managing” wildlife.

I hope that this publication on the importance of top predators, like wolves, will be brought to the attention of state wildlife organizations like IDF&G and will result in a change of their policy toward a greater respect for these animals. For those of you who are interested in finding out more about this fascinating & important subject of how the loss of top predators is effecting the earth, I recommend the following books:

Monster of God – by David Quammen A very readable account of how our fear & killing of predators is changing the world.

Where The Wild Things Were – by William Stolzenberg A journalist writes about the research that been revealing the key role that predators play in ecosystems.

Song of the Dodo – by David Quammen One of our best scientific & nature writers chronicles the researchers & their studies who have created the new field of Conservation Biology.

Of Wolves and Men – by Barry Lopez A brilliant examination of wolf biology & the often-searing history of mankind’s relationship to these fascinating & badly misunderstood animals.

Wolf Country – by John B. Theberge. The results and conclusions of wolf biologist from an eleven year study of wolves in Algonquin Park, Canada. This book includes a lot of valuable information, written in a readable and popular format.


                                                                       MYTHS & FACTS ABOUT WOLVES  (1/16/12, Rev. 6/15/13)

Northern Idaho Wolf Alliance (NIWA)


Ancient Pathways to A Sustainable Future

Contact: Ken Fischman, Spokesman

•      Minnesota’s wolf population has been stable, at 3,000 since,(2004, 5X as many as in Idaho).

•     Wolves were removed from the Endangered Species List by

a political manoeuver, in placing a rider on a must-pass appropriations

bill. It was never voted on or even debated. This marks the first time an

animal was removed for other than scientific reasons.

•     Wolves were hunted in Idaho barely five months after being taken off the

Endangered Species List. No other species has had this happen to

them. Almost 300 wolves were killed in Idaho & Montana’s first hunts

in 2010 and this number increased to over 550 in 2012.(did not include wolves killed for livestock depredation)

•   In most of Idaho they did not even setting an overall quota for the

2011 – 2012 hunt. Hunters may kill as many wolves as they can,

individual hunter limits are 10 wolves each, & they are

allowed to utilize: traps, baiting, & electronic wolf calls to do so.

•    The killing of such a large percentage of the wolf population

amounts to a slow motion extermination campaign. It is certainly not

“Managing” wildlife.

•     The 2011-12 Idaho wolf hunting season was 10 months long – beginning

September 1st. & ending in June. This long a hunting season is

highly unusual for any animal, & impacts the wolves’ mating denning


•   The  long wolf hunting season creates an almost year-round danger

for hikers, bird watchers, campers, & boaters from accidental shooting

by hunters. It is not safe to go out into the woods at any time now.

•    There have been only two authenticated killings of humans by wolves

in North America in the last 200 years, You are in greater danger of

killed by a dog. Dogs killed 27 people in 1997-1998 . 

•   Wolves belong in our wild areas. They are an essential part of a

healthy and functioning ecosystem. As an apex or keystone

predator they are crucial to the well being of everything from

flowering plants and trees to insects and all the other mammals,

including elk and deer.

•     There has been talk about the Idaho wolves being “aliens” because

they were introduced from British Columbia & Alberta. These statements

have no scientific basis. All state wildlife agencies as well as independent scientists

agree that  genetically, the wolves that

were historically eradicated from the northern Rockies

and the wolves that have been re-introduced in the past

decade are the same species, Canis lupus.

•     There have been wild claims that these wolves are huge, many over

200 pounds. All 188 wolves killed in the first Idaho wolf hunt in 2009 were officially

weighed by IDF&G agents. The average female was 86 lbs. and the

average male, 101 lbs. The largest was 127 lbs.

•     Many hunters claim that wolves are decimating elk herds – According to the Rocky

Mountain Elk Foundation 2007 Report, the Idaho elk population has been above

100,000 since 1985, and the Northern Rockies elk population has

increased 32.9% in the last 25 years, to over one million animals. Elk #s

increased by 3,000 in 2010 alone.

•     Idaho’s elk population fluctuates, but the hunters’ have a

perception that elk numbers are decreasing. This is probably due to the

wolves pushing elk off the valley floors and into the mountains,

making the hunters work harder to find them.

•     Contrary to the claims of ranchers, wolves are not killing off large

numbers of  livestock – According to the USDA

Statistical Bureau they are responsible for less than 2% of all

livestock deaths due to predation( less than 0.1% in Idaho).

In 2008, feral dogs killed more than four times as many sheep in Idaho than wolves did.

Eagles and other raptors carry off far more lambs than wolves kill.

•    There are 2.2 million cattle in Idaho. Last year wolves killed 71 of them.

Can you do the math to figure out the % killed? Hint: It is less than 1/100th

of 1%.

•     IDFG’s “wolf-management” strategy will reduce wolves to a remnant

population. Most wolf biologists agree that they  would become genetically isolated,

prone to inbreeding and inherited diseases, and unable to perform their historic

function in bringing balance to the ecosystem.

•     IDFG is using conflicting numbers when reporting wolf population.

They assumed a steady annual increase of 20 to 22% whereas in

reality Idaho’s wolf population increased by 8.8%, 15.6%, and

dropped 0.4% in 2007 , 2008, and 2009 respectively. In 2012, they decreased 11%. (USFW statistics).

•     In Yellowstone National Park the wolf population fluctuates. They declined by 27%

in 2007, & they lost nearly all their pups due to severe weather, disease, and prey scarcity. This happened again in

2008.- and this is in a place where they aren’t even hunted.

• There has never been a single case

of livestock depredation due to wolves reported in Idaho’s Panhandle.

and IDFG estimated the wolf population there to be a

minimum of 55 wolves in 2012.

Nevertheless, the wolf hunt quota for the Panhandle was removed.Hunters killed 71wolves there.

•     IDF&G’s attitude toward wolves is that they are damned if they do

& damned if they don’t. If wolves kill livestock, IDF&G retaliates. If

they do not kill livestock, they want them killed anyway they say, in order to reduce the possibility of livestock depredation.

•     Anti-wolf people claim that wolves are infected with tape worms(Echinococcus),

& that they are a threat to infect hunters with the worms. The Montana &

Idaho wildlife agencies as well as independent scientists have stated that

these worms were endemic to domestic livestock long before

the wolves were restored. Big-animal veterinarians

testified in state legislatures that there is little or no danger of people becoming infected.

All wolves released in Yellowstone and Idaho in 1996 were dewormed first.

•     If you chunked up Idaho into areas each of 100 square miles and

evenly distributed people, elk and wolves among the chunks you

would have in each chunk 1,800 people, 140 elk, and 1 wolf. That

demonstrates how few wolves there really are. How are they to

fulfill their role of keystone predator?

Wolves Don’t Belong On The Firing Line

Wolves Don’t Belong On The Firing Line

WRITERS ON THE RANGE - September 23, 2009By Ken Fischman

Signs of the times

 The day before the first-ever official wolf hunt started in Idaho on Sept. 1, I stood on the sidewalk outside the county courthouse in Sandpoint, watching cars stream into town. As demonstrators on the sidewalk waved placards protesting the hunt, people in those vehicles reacted, and I focused on their hands, counting waves and thumbs-up as being for the wolves, and middle fingers and thumbs-down as against. The results of my hour-long, admittedly crude poll were 128 for the wolves, 14 against. Surprisingly, truck drivers overwhelmingly sided with the demonstrators and against a hunt.

It occurred to me then that Idaho’s reputation as the most dependably conservative state might be based on a misunderstanding. But then again, where emotions are high, truth flies out the window. When you bring up the subject of wolves at a cafe or gas station in the nearby town of Clark Fork, you’re likely to hear people telling or accepting the most outlandish tales. For instance, many hunters insist that Idaho’s 846 wolves are devastating Idaho’s elk, even though the opposite is true. The Rocky Mountain Elk Foundation, an organization dedicated to hunters, reported in 2009 that although Idaho’s elk population fluctuates, it has risen above 100,000 animals for several years.

Many ranchers in Idaho believe that wolves are decimating livestock. But the Idaho Fish and Game Department found that wolves are responsible for only 1 to 2 percent of sheep depredation. In fact, feral dogs killed four times as many sheep in 2008 as did wolves.

Of all the questions surrounding wolves, the most crucial — and the one that has proved most intractable — is whether the population of wolves in the Northern Rockies has sufficiently recovered to warrant their being taken off the endangered species list. Looking for the right answer is like driving down a winding mountain road in the dark, without headlights.

When the federal government brought wolves back to the West in the mid-’90s, spending some $21 million in the effort, the U.S. Fish and Wildlife Service said that the wolf population would be considered recovered when Idaho, Montana and Wyoming each had 100 wolves. I would have loved to have been a fly on the wall when they came up with that goal.

Common sense tells us that a few hundred wolves in each state can’t be defended as a biologically viable population, yet legislators and wildlife professionals keep trotting out these figures as though they were holy writ to justify their insistence that wolves must be hunted. The latest federal report says that there are 846 wolves in Idaho, 497 in Montana, and 302 in Wyoming. The best minds in conservation biology — the science that deals with the preservation of species — are in agreement that the full recovery of these three distinct populations requires not hundreds, but thousands of animals. 

That means that a hunt at this time is premature. Compare Idaho to Minnesota, where there are 3,000 wolves, almost four times the number in Idaho. The Minnesota wildlife agency will not even consider holding a hunt for five years after wolves are delisted there.
Let’s put the issue in perspective. There are four times as many human beings in the tiny town of Bonners Ferry, up the road from Sandpoint, than there are wolves in all of Idaho. If hunters kill as many wolves as they plan to in this hunt, it will leave small, disconnected populations of wolves genetically isolated from each other and in danger of becoming inbred.

A few months ago, a study by Rolf Peterson of the Michigan Technological Institute, revealed what can happen when wolf populations drop too low. Peterson looked at genetically isolated wolves on Isle Royale National Park, an island in Lake Superior off the coast of Minnesota. All the wolves there have deformities of their backbones, making it difficult and painful for them to run. This is due to inbreeding.
As for what happens now that hunting wolves has begun, the political battle continues. Federal Judge Donald Molloy recently rejected a request from 13 environmental groups that he block wolf hunts in Idaho and Montana. Molloy said that the plan to kill 20 percent of the wolves does not put them in danger of extermination. He warned, however, that the federal government probably violated the Endangered Species Act by leaving Wyoming out of its plan, distinguishing a natural population of wolves “based on a political line, not the best available science.”  By definition, the judge added, that seems “arbitrary and capricious.”

Ken Fischman is a contributor to Writers on the Range, a service of High Country News ( He is a retired geneticist and member of the Northern Idaho Wolf Alliance. He lives in Sandpoint, Idaho.

Remarks At Demonstration Against Wolf Hunt


Ken Fischman, Ph.D.

Sandpoint, ID 83864


Remarks at Sandpoint Public Demonstration Against the Upcoming Idaho Wolf Hunt, 8/31/09.

Good Signs of the timesmorning, ladies & gentlemen. I am Dr. Ken Fischman. I am a retired geneticist, living in Sandpoint, Idaho.

I would like to address some important questions of fact and Science today.

Many hunters believe that wolves are devastating Idaho’s elk.  Nothing could be further from the truth. The Rocky Mountain Elk Foundation RMEF), an organization friendly to hunters, published a report in February of this year, showing that Idaho’s elk population fluctuates, but that it has been above 100,000 animals for several years now. The hunters’ perception that there are less elk is probably due to the wolves pushing elk off the valley floors and into the mountains, making the hunters work harder to find them

         RMEF also said that there are over one million elk in this country, most of them in the Northwest. Compare this with the tiny number of wolves. At the last official IDF&G count, in March of this year, there were 846 wolves in Idaho. Hundreds of thousands verses hundreds.

         If you say that it is unfair to compare predators with their prey, lets compare the wolves with other predators. According to the US Fish & Wildlife Service, there are over 31,000 mountain lions in the Pacific Northwest alone.

• Many ranchers believe that wolves are decimating livestock in Idaho. Once again, this is far from the truth. The United States Department of Agriculture’s Bureau of Statistics reports that coyotes are responsible for over 2/3 of livestock depredation in the US, and wolves are far down the list.

         The difference gets even more dramatic in Idaho.  ID F&G states that wolves are responsible for only 1 -2 % of sheep depredation in Idaho. Wild dogs killed over 4X as many sheep in Idaho than wolves do. Even eagles and other raptors carry off more lambs than wolves do.

         Yet, when a wolf killed 2 calves on a ranch in Eastern Idaho, it got front page headlines. Why? The answer lies in mythology and hysteria, not in fact.

Lastly, I would like to tackle the question of whether wolves are sufficiently biologically recovered in Idaho to justify their being hunted. Let’s put this in perspective. There are 4X as many human beings in the little town of Bonners Ferry, up the road from here, than there are wolves in all of Idaho. If this hunt goes through and they kill as many wolves as they plan to, they will leave small, disconnected populations of wolves, which will be genetically isolated from each other, and in danger of becoming inbred.

         When we asked for evidence of genetic connectivity, the USF&W gave a few anecdotal references to wandering wolves. That does not prove gene flow from one population to another.

         We no longer have to guess about the consequences of genetic isolation of wolves.  Just a few months ago a study was published on what has happened to the wolves on Isle Royale National Park. Isle Royale is an island in Lake Superior. All the wolves there have deformities of their backbones, making it painful and difficult for them to run. This is due to inbreeding.

         What will IDF&G do to prevent that from happening here? Will they fly wolves by UPS between Yellowstone and central Idaho like they now truck salmon around dams?

         The restoration of wolves has been a great success, but it is premature to hunt them now. The best minds in Conservation Biology talk in terms of several thousands of animals needed for recovery, not hundreds.

         Minnesota, where there are over 3,000 wolves, will not even consider holding a hunt for 5 years after wolves are delisted there.

         Minnesota has acted conservatively. Idaho should follow their lead and postpone its wolf hunt.